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Gas Powered Thoughts Advice for Gas Helicopter Success from Carey Shurley


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Old 08-20-2013, 08:46 PM   #1
carey shurley
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Join Date: Apr 2004
Location: Lake Mary, FL
Default Build - HWC TRex 700 RC Conversion



Overview



HWC has completed the design of their latest gas conversion for the Trex 700. This is the first helicopter kit offered by HWC or Century Helicopter for the RC format of the Zenoah engine.


Photo Courtesy Century Helicopter

The kit is very complete. You need the basic components from a Trex 700 plus your electronics and a Zenoah RC format engine to complete the conversion.

The following are the parts needed from a "donor" Trex 700. This conversion is for the traditional Trex 700 model that uses a bellcrank control system
  • Entire tailboom/tail rotor assembly
  • Constant drive hub/tail rotor drive gear
  • Clutch support block/bearings
  • Landing gear/landing gear mount blocks
  • Main shaft/main bearing blocks
  • Canopy support bumpers/frame support
  • Main Rotor head complete
  • Swashplate complete
  • Elevator/aileron bellcranks/rods
  • T/R control rod/bellcrank
  • Elevator mount block
  • Radio tray complete



Required parts from Trex 700 donor model

Additional Required Parts
No additional parts are required for the conversion. Everything needed to make the conversion is included

You'll of course need an engine, muffler, blades and electronics.

Last edited by carey shurley; 09-03-2013 at 04:39 PM..
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Old 08-21-2013, 10:29 PM   #2
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Default Component Pre-Assembly

Pre-Assembly - Chassis


Like most models if some pre-assembly is done it really simplifies completing the converson. This one is no different so I want to go through some pre-assembly first with chassis parts and then with the engine

Here you can see all the parts, both from the donor model and from the kit that are needed for this segment of the assembly. Its not a requirement that you follow this order of assembly


Chassis components for pre-assembly

The kit comes with a 103 tooth helical main gear. The newer Trex models have helical gears but the older ones do not. Doesn't matter you won't need the original main gear. You do need the main drive hub and bolts from the donor model though. The new main gear is recessed just like the original and assembles the same way


Parts to assemble main gear

Combine these as shown and use thread lock on the bolts. Set aside until later


Main gear assembled

This kit comes with a new canopy and has its own method of mounting. The frames are made so that you CAN use the original Trex canopy if you want in which case you won't need this part, but if you want to use the included Century canopy then located these parts and assemble the front canopy mount


Front canopy mount parts

use thread lock and set this aside for later


Front canopy mount assembled

Like all RC format based helicopters, there is a bottom engine mount plate that the engine will be bolted to. Before putting the engine in the plate there is some work to do. Locate the plate and two cross member plates as shown


Parts to assemble bottom plate

Note the orientation of the cutouts on the plate bolt the two cross members to the "top" of the plate as shown. The cross members have "flats" on them, make sure they are against the plate. You'll also note these mount holes in the plate are slotted, this is to account for optional pinion gears so don't thread lock or fully tighten these bolts at this point


Bottom plate assembled

On the main frame sides. I started with the left side and these are the parts used. The cutouts in the frame sides are identical BUT the bearing holders for the elevator are NOT. So pay attention to this the bearing holders will be on the outside of each frame which will identify them as left and right.


Parts to assemble left frame

The fuel tank is isolated and is sandwiched between two mount plates on the frame. Start by installing the short bolts and lock nuts onto them as shown. They are not directional just make sure both bolts/nuts are on the same side of each retainer


Fuel tank retainer

Because the muffler is on the left side of the model, the tank is offset to the right side of the model. To that end the spacers that hold the tank mount plate are shorter on the left side. They also mount differently on each side. On the left side the tank mount is held in place by two longer bolts that go through the frame side


Left side fuel tank retainer spacers

here you can see the left fuel tank mount positioned on the frame with the shorter spacers in place with the mount bolts through the frame


Left side fuel tank retainer in position

These bolts are retained with locknuts inside the frame as shown


Left fuel tank retainer installed

Install the provided left canopy mount as shown if you are using the included Century canopy


Install left rear canopy mount - Century Canopy

If you intend to use the original Align canopy then instead mount one of the original rear canopy mounts in the alternate position shown here


Install left rear canopy mount - Trex Canopy

As with the original model, the aileron/collective servos mount into the frames using some plastic servo nuts that attach to the frame. HWC includes these in the conversion so you can mount one of them as shown using the supplied screw. Don't fully tighten this yet until later when the servo is installed so that the spacing will be correct for your servo.


Left frame servo nut installed

As with the original model, the elevator servo is installed into a carrier on the left frame so that it is properly positioned. Go ahead and install that now using thread lock if you have the aluminum parts or CA if you have the plastic parts


Elevator servo mount installed

That wraps up the left frame pre-assembly now we'll do the right side which is almost identical. Again note the position of the bearing holder as this will indicate which frame is for the right. These are the parts for the pre-assembly and you can see that I've already installed the right rear canopy mount (for the Century canopy) and the fuel tank mount stand-offs. Note that the fuel tank standoffs on the right side are longer and are retained to the frame using bolts from the inside. Thread lock all of these parts into place


Parts to assemble right frame

If you intend to use the original Align canopy then instead mount one of the original rear canopy mounts in the alternate position shown here


Install Right rear canopy mount - Trex Canopy

And here's the right frame completed. Note that the original rudder bellcrank has been bolted into place as well as the right side fuel tank retainer which mounts using two short bolts. All of these can be thread locked into place as well


Right frame completed

Now to to the fuel tank. This conversion is a bit unusual in that it has a custom molded fuel tank that FINALLY includes the right number of fittings to plumb a gas helicopter!!!

Here are the parts you'll need to build the fuel tank pickup. Some notes here. The kit includes the yellow tubing you see. Its too stiff to put inside the fuel tank so don't use it. Instead use the black Viton tubing that comes with the RC motors. Its much more flexible. Next the kit includes a metal clunk. Replace it with a felt clunk. The RC motors come with a felt clunk its too big to get through any of the holes on this tank. Get a Stens #610-014 as shown, its smaller and will fit through the holes


Fuel tank pickup parts

Build the fuel tank pickup as shown. Cut the pickup tubing to a length of 4". BTW if you decide to instead use neoprene for this tubing, expect it to split over the fittings so you'll want to check it occasionally,


Fuel tank pickup assembledf

The return fitting for the tank goes into the top as shown. Work one of the brown grommets into the tank and then push the fitting into it


Fuel tank return fitting

Heres the fuel tank return fitting installed


Fuel tank return installed

The kit includes four rubber tank isolators, push them into the fuel tank as show. This will pop into place and shouldnt' require any adhesive


Install fuel tank isolators

Install the fuel tank pickup through the hole in the front of the tank. You'll need to work the felt clunk a little bit to get it through but it will fit. Once its in then seat the brown grommet in the tank and finally push in the fitting


Insert fuel tank pickup

when you're done, the fuel tank assembly should look like this


Completed fuel tank

To assemble the clutch bell you'll need the clutch bearing block/bearings from the donor model, these may be plastic or you may have upgraded to the metal part shown. The procedure will be the same either way. The kit includes a 17T helical pinion gear and this large clutch bell.

This is the Century HD clutch and it works very well on gas helicopters. They get credit from me for providing both a clutch that really locks up well AND still has a method for spin starting the engine. Most conversions choose one or the other but not both.


Clutch bell parts

The pinion goes together in the usual way, the radial bearings slip over the pinion and the retaining nut is snugged into place with thread lock


Install Pinion bearings

The clutch bell threads over the pinion as shown. You can use some blue thread lock on this but its reverse threaded so its not going to come off in use


Clutch bell installed

The pinion installs into the bearing block in the usual way it fits into the clutch bearing block


Assemble clutch bearing block

Use the included start shaft and push it through the clutch bearing inside the bell as shown


Start shaft inserted

Finally install the included starter coupler using the M3 set screws. Make sure you position one of the set scews on the flat on the shaft. Use thread lock and fully tighten

This concludes the clutch assembly, set it aside for later


Clutch bell assembly completed


Next Step

Engine Preparation

Last edited by carey shurley; 08-25-2013 at 10:19 AM..
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Old 08-23-2013, 06:48 AM   #3
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Default Engine Preparation

Engine Preparation

In this step the engine will be prepared for installation. Whether you use a traditional ignition RC format motor or an electronic ignition engine such as the HWC these steps will be the same


Parts to prepare engine

Because the engine mounts into the chassis facing forward, the hot air from the cooling system is blowing upward. Traditionally this winds up letting hot air blow into the canopy which can overheat the electronics. HWC created a deflector that extends outside of the canopy to address this. In order to mount it the first step is to remove this screw


Remove original shroud mount bolt

The engine mount bolts onto the front of the crankcase as shown using the M4 bolts that are included. Use thread lock and fully tighten these. The mount doesn't have an up/down side orientation but the open end of the mount must be oriented as shown


Engine Mount install

This is the air deflector discussed earlier, its going to mount as shown


Position for air deflector

The deflector mounts using the included bolts. Use thread lock on the engine mount bolts and RTV on the bolt that goes into the cylinder.

This deflector is made from fiberglass and may have warped slightly over time. If it does not fit snugly onto the top of the cooling shroud, use a heat gun and warm it slightly so that you can fit it to the right shape


Air deflector installed

Smear a drop of oil onto the angled end of the crankshaft and then place the clutch hub over the end of the crank as shown. Install a piston stop into the spark plug hole and then tighten the mount bolt shown using thread lock. NEVER hold the flywheel side of the motor when tightening up the clutch or its mount. Doing so can twist the multi-piece crankshaft


Clutch hub install

Once the clutch hub is installed, the clutch will thread into it as shown


Clutch install position

Here you can see the clutch fully installed. You can use thread lock on this if you want, its reverse threaded though so its not going to come out


Clutch installed

The kit includes an aluminum throttle control arm as shown. Its not mandatory to use it but its a nice part so its your option

Install the control ball, retaining nut using thread lock and thread in the set screw for now


Carb arm parts

Remove the stock carb control arm by removing the screw shown and lift off the plate.


Remove stock carb arm

The included control arm is designed for an older version of the walbro carburetors. If you find that it won't fit over the carb shaft you'll need to drill it out as shown. For the Walbro WT990 you'll need a 3/16" drill


Carb arm must be drilled

Now slip the control arm over the carb shaft as shown. Put some thread lock on the set screw, install it and lightly tighten it. Now move the control/arm throttle around so that its movement is roughly centered. The throttle movement is about 60 degrees. When viewed from above, you want the control arm to move about the same distance from fully closed to center as it does from fully open to center. Once you have this set, tighten the set screw

Make sure before you do this that you've backed out the "idle"screw underneath the carb so that the throttle will have full throw


Install new carb arm

The way the bottom plate is made, you cannot install an engine with a kill switch protruding as it hits the plate. You have two choices:
  • grind the plate shortly to allow clearance
  • remove the kill switch and plug the hole

On this conversion I'm using the HWC EI engine and the kill switch serves no purpose so I'm going to plug the hole

First remove the fan shroud by removing the two phillips head screws at the top of the shroud and the 4 - M5 bolts that hold the shroud on. Regardless these four bolts are going to be replaced with longer ones

[IMG]http://i1305.photobucket.com/albums/s548/gaspoweredthoughts/HWC%20T700%20
RC%20Conversion/Engine%20Preparation/removefanshroudlr_zps008781c3.jpg[/IMG]
Remove fan shroud

On the EI system the switch simply pops out.


Remove kill switch

I made a plug for this hole out of scrap graphite that simply slides into the place of the kill switch as shown


Plug for kill switch hole

re-install the two phillips head screws that connect the metal fan shroud and the plastic cooling shroud. Now you can put the bottom plate on the engine. It should be oriented as shown


Bottom plate orientation

Mount the bottom plate to the engine using the four longer M5 bolts included as well as the M4 bolt included. Use thread lock and fully tighten. This is the only conversion I've ever seen that uses that M4 bolt lug on the fan shroud


Bottom plate installed

At this point the basic engine preparation is completed. Set it aside for later installation into the chassis.


Engine preparation complete


Next Step
Chassis Assembly

Last edited by carey shurley; 08-25-2013 at 07:48 PM..
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Old 08-25-2013, 10:20 AM   #4
carey shurley
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Default Chassis Asssembly

Main Chassis

Time to get going on the main chassis assembly. Here are the parts/pre-assembled components that will be combined in this step. Some of the parts are from the donor model and the remainder are from the conversion kit


Chassis Components

Start by installing the major components onto one of the frame sides, I've used the left side. Install the:
  • front t/r transmission
  • main shaft bearing blocks
  • rear landing gear mount
  • radio tray
  • elevator servo mount
  • pre-assembled clutch


Major components installed on left frame

These are the bolts used. At this point don't fully tighten or use thread lock on these


Left frame bolts required

The rear holes on the main bearing blocks are not sized to use the shoulder bolts. Since the original Trex 700 only uses two bearings on the mainshaft, the conversion includes a brace to better stiffen the frame to prevent drivetrain flex. Mount this brace as shown using the included bolts. Don't use thread lock or fully tighten at this point


Left Frame brace installed

The bottom of the brace mounts to a new rear frame spacer as shown


Rear frame spacer installed

The front lower frames use doublers to make them more stiff. On the left side you'll use the doubler of this shape and mount it in this orientation


Left frame doubler orientation

When you bolt on the left doubler, you'll also be attaching these components


Components for left doubler install

Here are the bolts lengths. Don't fully tighten or thread lock these yet


Left frame doubler installed

Slip the elevator control shaft through the frame bearings as shown. This is from the donor model


Install elevator control shaft

Install the previously assemble fuel tank into its cavity on the frame. The rubber isolators on the tank will engage with the locknuts on the tank retainer. You may need to slightly rotate each isolator so that the lock nut on the retainer plate slips correctly into the five-sided hole on the isolator


Install fuel tank

Now you can install the right frame side. Set it onto the previously assembled left frame and bolt it together in the same way as the left frame. No thread lock yet and don't tighten them all. Don't forget to align the fuel tank isolators on the right side of the tank so the seat into the mount bolts on the right frame retainer.


Right frame orientation

There is a frame doubler for the right frame as well. Before you install it on the frame first install the front servo nut for the throttle servo


Right doubler front servo nut

it is held in place by this screw. This can be fully tightened but no need to overtighten


Servo nut retainer screw

The right doubler is installed as shown, the bolts will be the same as on the left side with the exception of this screw


Right doubler installed

which will be used to install the rear throttle servo nut as shown


Throttle servo rear nut

At this point the right frame is installed on the chassis but the bolts aren't tightened yet


Right frame installation completed

Slide the main shaft into main bearing blocks as shown. Now you can thread lock and fully tighten every bolt on both frames EXCEPT the four bolts on the clutch bearing block. Leave those loose for now


Main shaft installed

Install the main gear onto the mainshaft and tighten its retaining bolt. Now install the right frame brace as shown using the same bolt pattern as was on the left frame. Use thread lock and fully tighten


Main gear installed

This conversion supports multiple gear ratios depending on the pinion size. This is why the mount holes for the clutch bearing block as well as the engine mount holes are all slotted.

Before installing the engine set the main gear mesh which will properly position the clutch for your chosen gear ratio.

The final step here is to set the main gear mesh. Helical gears don't require lash so using your thumb, push the pinion gear on the clutch into the main gear. Doesn't require much pressure just make sure its seated. Now fully tighten the four bolts on the clutch bearing block using thread lock


Set gear mesh

At this point the central chassis assembly is completed

Next Step
Install Engine

Last edited by carey shurley; 08-25-2013 at 08:24 PM..
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Old 08-25-2013, 10:54 AM   #5
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Default Install Engine

Engine Installation

In this step we'll combine the chassis just built and the engine pre-assembly done earlier. Combining the parts is very simple, set the engine assembly on a flat surface and slip the chassis over the top of it as shown. Be careful to not pinch the ignition or EI trigger wires between the frame spacers.


Chassis/Engine Installation orientation

The engine is held in by the six M3 x 10mm bolts provided. Install them as shown but don't fully tighten them yet


Engine mount bolts

With the spark plug out of the motor, use a spin starter and spin the motor over. This will act to align the clutch and the engine assembly. Now you can thread lock and fully tighten the six engine mount bolts


Engine spin alignment

Install the four m3 x 8mm bolts that hold the rear of the engine plate to the chassis. Use thread lock. Also tighten the four bolts that hold the frame spacers previously mounted to the bottom plate. Use thread lock.


engine plate bolts

At this point the engine is installed into the chassis. Make sure you're tightened every bolts using thread lock. Note how far the air deflector extends past the chassis frame


Engine installed

Next Step
Landing Gear Install

Last edited by carey shurley; 08-25-2013 at 08:40 PM..
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Old 08-25-2013, 10:59 AM   #6
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Default Landing Gear Install

Install Landing Gear

Now the landing gear goes on the chassis assembly. You'll need the complete landing gear from the original donor model. This conversion includes some standoffs and longer bolts. The standoffs are needed for ground clearance if you intend to pull start your engine. If as in this conversion you remove the pull starter and don't intend to use it at all, then you don't need these standoffs


Parts for landing gear installation

If you are going to use the standoffs, they install using the included longer M3 bolts. They go through the landing gear as shown and the standoffs will sit between the LG and the chassis


Install standoffs for pullstart version

here you can see how the fit into the chassis. Install with thread lock and fully tighten


Install landing gear with standoffs - pull start version

With the landing gear installed with the standoffs, you can see how it improves ground clearance


Landing gear installed - pullstart version

If you don't care about pull starting, leave the standoffs out and just use the original bolts to mount the landing gear with thread lock as shown


Landing gear installed - non pull start version

Next Step
Install Rotor Head

Last edited by carey shurley; 08-25-2013 at 08:50 PM..
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Old 08-25-2013, 11:00 AM   #7
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Default Install Rotor Head

Rotor Head

Nothing unusual about these steps. First slip the swashplate from the donor model over the mainshaft and connect the control rods to the bellcranks. No adjustment should be needed from the original donor model setup


Install swashplate

Install the rotor head onto the main shaft and connect the control rods. Make sure you thread lock it together


Install rotor head

rotor head is now installed

Next Step
Install Tail Boom

Last edited by carey shurley; 08-25-2013 at 08:51 PM..
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Old 08-25-2013, 11:03 AM   #8
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Default Install Tail Boom

Tail Boom

Install the assembled tail boom into the previously installed front t/r transmission. It will just slip into position. Make sure the hole in the boom aligns with the retaining pin bolt hole. Then install the front boom retainer bolt and tighten the four bolts on the tail boom clamp


Install tail boom

The boom supports install into their normal position BUT because of the way the frames are made you'll need to add some washers or spacers between the front boom support mounts and the frame. If you don't do this the support end will not fit properly onto the frame. You'll need this on both sides


Boom support spacer

Install both front boom support bolts using the original frame spacer and thread lock. Fully tighten. Also don't forget to check the rear boom clamp to make sure its tight on the tail boom


Boom supports installed

Finally don't forget to re-connect the front link on the t/r control rod to the t/r bellcrank. If everything is aligned properly it should fit with no adjustment necessary.


T/R control rod connected

Next Step
Install Electronics

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Old 08-25-2013, 11:04 AM   #9
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Default Install Electronics

Install Electronics

Now that the model is basically done its time to install the electronics. Nothing special about the requirements, typical as you would use in a Trex 700 Nitro model


Typical electronics needed for the setup

The kit includes everything you need to mount the servos including a control rod for the throttle


Servo mounting parts - included

Century makes their own servo arms for the cyclic controls, they are a bit different from the Align wheels as they only have two mount points. They include servo balls with a much thicker base mount. I'm not sure that I've ever seen an Align ball break at the mount stud but these won't for sure


Assembled servo arms

If you're wondering how they compare to the Align wheels, here you can see that they are just slightly larger in diameter than the Align wheels. They also assemble differently


Difference between included servo arms and Align

The Align arms are not specific to any radio system instead you bolt them to the small servo wheels that come with whatever servo you have. Pretty simple but you do need to have the servo wheels in their final position before you bolt these arms on


Installing servo wheels

In my opinion, this area in the Align radio tray is the best place to put the EI system unit if you are using an EI system. It fits perfectly and still allows the plug wire to be routed away from everything else


EI system location

here you can see how I routed the high voltage wire through the front of the radio tray


Plug wire routing

There is no particular order to installing the electronics, I'll just show where they go

here the left side servo, typically the aileron servo. They all mount using the small servo screws and the graphite servo retainers


Aileron (left) servo installed

And on the right side you can see the Elevator, Pitch and Rudder servos installed. If you are using a metal elevator servo tray, you'll need to use the original M2.5 bolts to mount your servo. If you are using the plastic servo tray the included screws will be fine


Rudder/Pitch/Elevator servos installed

The throttle servo is oriented as shown. The screws thread into the previously installed servo nuts on the back of the throttle plate


Throttle servo installed

Depending on the type of FBL system you are using (or if you have a flybar they type of gyro) you'll need to mount the system. There are many places for it to go, I placed it on top of the elevator servo where it can be secured


FBL controller/sensor installed

The system battery should go on the front of the radio tray. Keep in mind that if you are running a shared system, the EI system draws considerable current so you should use a much larger battery than you might normally use


Battery installed

The original control rods can be used for the cyclic controls, seen here on the aileron control


Aileron control rods installed

the same is true for the pitch side


Pitch control rods installed

as well as the elevator and rudder control rods


Rudder/elevator control rods installed

The throttle rod is longer than normal and the kit includes one that is sized correctly


Throttle control rod installed

when everything is in, it all needs to be wired up and that wiring secured. Here you can see how I did it from a left side model view


Wiring complete - left view

And from the right side you can see more of the wiring routing


Wiring complete - right view

at this point you can do the full setup in your transmitter, the remaining steps will not affect it.

Next Step

Model Completion

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Old 08-25-2013, 11:04 AM   #10
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Default Complete Model

Final Steps to complete model

There are a few steps left to complete the model before installing the canopy

start by installing the spark plug if you haven't already


Spark Plug installed

Push the plug cap over the spark plug. If you're using a magneto engine, it will route easily, if you're using an EI engine you need to work the cap around a little but it will fit as shown


Plug cap installed

Now you can plumb the fuel system. The kit comes with tubing or you supply your own. I used std tygon tubing

you'll also need to vent the tank, either use a "one way" valve or create a "looped line" vent as I've shown here. This will allow the tank to vent but prevent fuel from leaking out when the model is inverted


Fuel plumbing parts

connect the fuel inlet line, fuel return line and the vent to the tank. Its VERY difficult to get these on the tank at this point so I removed the main gear for easy access

BE VERY CAREFUL with the plastic tank fittings. They are fairly thin and can be broken so avoid side pressure


Tank side plumbed

now plumb the carburetor side, you need to connect the fuel inlet and the return fitting


Carburetor plumbed

If you are using an HWC motor, it will have come with an air filter. You definitely want to install an air filter. Now is a good time to do this, remove the carb mount bolts


Remove carb spacer plate

and then install your air filter base plate. These come in different sizes and shapes but the HWC filter base is shown. Use thread lock or RTV on these bolts to prevent the carb from coming loose


Install air filter base

complete installation of the air filter. The Century filter simply threads on


Install air filter

I'd suggest you use a muffler thats quiter than the std zenoah canister muffler. Here you can see the Century Torpedo slim in position to install


Muffler positioned for installation

And with the Century muffler installed. Finally you can install other mufflers on an HWC conversion, the Hatori and/or RJX mufflers will fit easily on this conversion


Muffler installed

Wrap up the assembly by installing rotor blades. I've used 690mm Rotor Tech FBL blades.


Rotor blades installed

Next Step
Install Canopy

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Old 08-25-2013, 11:05 AM   #11
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Default Install Canopy

Canopy Installation

The conversion comes with a brightly painted canopy in the style of the Century Radikal model. You can install the std Trex canopy but this one is larger. With the taller chassis the std canopy looks a bit odd. This one is more in proportion to the model

the kit includes what you need to install it


Parts to Install Canopy

the rear of the canopy is pre-drilled for the mount grommets, install them and apply thin CA to them inside the canopy. They will be more vibration resistent if you glue them in place.


Grommets installed

The mount that holds the canopy in place is not long enough. To address this, use velcro to ensure that it can't come off. Put one piece here on the chassis mount


Install Velcro on mount

Depending on which muffler you are going to run, you may want to slightly adjust the angle/position of the canopy. You can do this by moving the front lower canopy mount tab to the bottom of the frame spacer it attaches to. To change this at this point you'll need to remove the two bolts on the outside of the frames that hold this in place, remove it and flip it over.

MAKE SURE you've chosen the position for this BEFORE you make the air deflector cutout in the canopy


Adust position of lower canopy mount

and put its matching piece here in the center bottom of the canopy


Install velcro on canopy

mount the lower canopy retainer in place as shown, center it on the bottom of the canopy and mount it with the wider opening towards the chassis. You'll need to drill two small holes for the mount screws. The exact position isn't critical but you want it to be as close to the edge of the canopy as you can get it


Canopy retainer installed

here you can see the two screws that hold the retainer in place. Use slow CA when you install them


Canopy retainer screws

Fit the canopy onto the model and you'll see that you need to trim it slightly to allow air from the air deflector to exit the canopy. This is the approximate shape


Canopy marked to trim

remove the canopy and trim the small area, I used a dremel tool and a grinding wheel


Canopy with cutout

here you can see how the canopy has been relieved. This is important, if you don't make this cut the hot cooling air blowing from the motor can collect in the canopy and overheat your electronics


Air Deflector clearance

finally here's the model with the canopy installed.


Canopy installed

Next Step
Model Summary

Last edited by carey shurley; 09-03-2013 at 10:28 PM..
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Old 08-25-2013, 11:06 AM   #12
carey shurley
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Well thats it, the model is complete. Here are a view different views


Right Side - Canopy on



Left Side - Canopy on




Nose on view - Canopy on



Std Align rotor head



Right Side - Canopy off



Left Side - Canopy off


Engine closeup view

Last edited by carey shurley; 09-03-2013 at 09:31 PM..
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Old 08-25-2013, 11:06 AM   #13
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Build Overview

This conversion is easy, rather than do a series of build videos I made this build overview

Video Narrative

Last edited by carey shurley; 09-17-2013 at 06:44 AM..
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Old 08-25-2013, 11:07 AM   #14
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Default Initial Flights

coming soon
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Last edited by carey shurley; 09-17-2013 at 06:46 AM..
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Old 09-17-2013, 06:45 AM   #15
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I posted a build overview video for the conversion
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Old 09-21-2013, 02:47 PM   #16
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That looks more like a Radikal conversion using "Better quality" parts from Trex700....
Changing original main gear of Trex700 to lesser diameter main gear means reducing the power band of the original design.
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