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Finless Bob's Helifreak Tech Room Finless Bob's Helifreak Tech Room - Tips and how-To Videos


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Old 01-13-2008, 11:26 AM   #281 (permalink)
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Default JR 770 Gyro

Hi Folks, is there any video on how to setup the JR 770 gyro or at least a good thread if anyone knows ?
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Old 01-13-2008, 07:40 PM   #282 (permalink)
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the way i did it, or at least understood from the manual (sheet), i set the endpoints in the radio to 150/150 for the rudder channel, and set it to heading hold for all 3 flight modes. I moved the stick fully in both directions and turned down the travel adjustment dial until the servo did not bind any more.

I found an arm with a hole 11mm (i think that's what it said) from the center, and mounted it on the servo. Set this so the ball is 90 to the servo. Attach the linkage, and then the long linkage can be set to get the tail blades centered.

I'm just not sure how you adjust the piro rate, i haven't looked at the sheet in a few weeks, i think you dial down dual rates or the endpoints, like i said, not sure.

Although, i flew mine today, and the tail was slowly slowly moving to the right, into the wind (i was hovering 90 degrees to the wind). Is this normal? I'm waiting until a day not as windy to do another flight and see if it does the same thing.
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Old 01-13-2008, 10:20 PM   #283 (permalink)
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No it isn't normal, there should not be a drift.

From what I gather, you need to set the linkage so you get zero drift in rate mode and this will eliminate the any drifting in HH mode.

I haven't been able to try this though.
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Old 01-15-2008, 12:34 AM   #284 (permalink)
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what is rate mode good for anyway ? Do I not always want to be in HH ? The only reason I could possibly think of going into rate mode is that you probably get more piro rate !?
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Old 01-15-2008, 12:52 AM   #285 (permalink)
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Rate mode is where the gyro attempts to keep the tail from moving around, but it can't put the tail back where it was.

So if you get a wind gust or hard maneuver that pushes the tail, the gyro will try to counteract the rotation but will not put it back to where it was supposed to be.

I think rate mode is mostly used for scale flying and some like to used it for forward flight as the tail has a tendency to follow behind the heli. I don't think you have to "steer" the tail as much.

For 3D or any aerobatics like loops and rolls, yes you should be in HH mode to prevent the tail from blowing out on you.
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Old 01-15-2008, 03:57 AM   #286 (permalink)
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I want to reply what Henrik, from Denmark, says.

Thank you Bob for your great job, I'm not expert in Rc-Heli but with your videos I'm sure I'll be able to build my new Trex Nitro Pro.

Thanks again :notew orthy: noteworthy

Paolo
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Old 01-15-2008, 04:08 AM   #287 (permalink)
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Default Three RPM settings on FF7

Hi
In Bobs vids he shows how to set up a gov with the DX7 using the flight mode switch so he could have three rpm settings,I have looked at my FF7 and I think I could do the same, but when I look in the P Mix menu in my FF7 it is different to the DX7, in the FF7 I have the rate menus and the offset as in the DX7 but I also have Mas>CH1 and Slv>CH4 as well as the switch menu, I understand the rate, Offset and Switch menus but not the Master and Slave menus.
Can I set the FF7 to have three settings on my TJPro on the Idle up switch like Bob did

Thanks

Simon
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Old 01-17-2008, 04:35 PM   #288 (permalink)
 

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Default Ready to roll....I think...

Hi All,
First thing first; Txs alot Bob, for making the vids. I flown electrics for a year now, and now my first nitro i buildt and ready for action. Your effort really helped me out in the build process.

Now, I'm new to nitro's and I guess my question is pretty basic.

First, my application is as follows:
Bird: Trex 600N Pro
TX: DX7
RX: AR7000
BEC: Align 2in1 with 2s2p Flightpower 3000 amps
Governor: Futaba GV-1
Gyro: Futaba 401
Cyclic servos: 3x9252 @5.8 volts
Throttle servo: 9252 @5.8 volts
Tail servo: 9254 @5.1 volts (stepdown)

I have now set everything according to Bob's vids and I want i all set up for 3d.

Should I set spesific curves for throttle (for each flight mode) other than the vids show?

I guess pitch curve logic is equal to flying electrics, right?

Finally, Align claims the tank is designed in a way that a header tank is not required. Is this "really" the truth?

/runar
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Old 01-17-2008, 05:43 PM   #289 (permalink)
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The curves I show work well as a safety and will do well should the gov stop working. i have tested those curves myself (by turning off the gov). Head speed drops and it good enough to get you down very safely! You wouldn't want to fly around with these curves but you will know the gov stopped working yet it will be good enough to make sure you get the bird home safely!

Yes pitch curves are no different than an electric!

Hmmm header tank and design... well it's not 100% right... there are conditions where the clunk will NOT get fuel. I don't run a header tank myself but I also limit my flying to 8 minutes which leaves about 1/4 of fuel in the tank. Even then I have had a few "sputters" when getting that low. Many folks are now using new clunks designs and what not to make sure they don't have a fuel delivery problem. I myself haven't needed them but again I make sure I quit before the tank gets below 1/4.

As for adding a header tank... Well yes that is a sure fire approach but myself I just cant do it as they look ugly on this heli because there is no good place to mount one... I will lose the 2 more minutes by not having one myself.

Bob
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Old 01-18-2008, 12:08 AM   #290 (permalink)
 

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Default T-rex 600N

Can I set up the throttle cut switch and leave the throttle recovery off in the DX-7 and still do the setup on the GV-1?
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Old 01-18-2008, 12:13 AM   #291 (permalink)
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ghayes I am not sure i understand what you are asking? Yes you CAN do this if you know how throttle recovery works... What are you trying to do exactly?

Bob
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Old 01-18-2008, 09:36 AM   #292 (permalink)
 

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Ok, txs for your answer and opinions. Do you know how the new clunk the design works?
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Old 01-18-2008, 05:17 PM   #293 (permalink)
 

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Default 600n

I was just wondering if I had to activate throttle recovery if I set the switch for throttle cut. In the video u use throttle recovery for setup of GV-1 to close carb.
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Old 01-18-2008, 06:07 PM   #294 (permalink)
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You can do both if you like. I made a cut switch AND left throttle recovery on.

Bob
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Old 01-19-2008, 09:49 AM   #295 (permalink)
 

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Default Shogo, shugo ,chugo?

You talks about something to put on your bearings who are running inside plastic parts. What is that? A picture would be nice Mvh sulan
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Old 01-19-2008, 11:39 AM   #296 (permalink)
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Shoe Goo is a rubber cement type of substance. Sometimes it's hard to find outside the US. Find a rubber contact cement and that will work too.

Bob
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Old 01-19-2008, 01:56 PM   #297 (permalink)
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You can get something called "fendermender" in the UK from RC model shops that deal mostly in RC cars its for Body Repair Adhesive, funny enough its made Austin TX USA.
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Old 01-20-2008, 01:01 AM   #298 (permalink)
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Quote:
Originally Posted by sulan View Post
You talks about something to put on your bearings who are running inside plastic parts. What is that? A picture would be nice Mvh sulan
You can also use UHU Glue, does the same job

Simon
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Old 01-20-2008, 09:39 AM   #299 (permalink)
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Quote:
Originally Posted by Finless View Post
Shoe Goo is a rubber cement type of substance. Sometimes it's hard to find outside the US. Find a rubber contact cement and that will work too.
The stuff I use is called "Amazing Goop". You can usually find it in the plumbing aisle, at least here in the states. I got mine at Wal-Mart.
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Old 01-22-2008, 12:35 PM   #300 (permalink)
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Thumbs up

A quick folow up to the breaking in video would be good
just a quick one on tuning :-)

And how about an update with the GV-1 and ATG
I am running the ATG and I THINK it some times pulls the motor to low.

Nice vids I would never have got my ATG to work with out your help
as no one were I live has got a clue ...Thank you :-)

how about some nice topless girls handing you the tools and drying your sweating brow when doing the build videos :-)


Thanks again
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