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Thunder Raptor 90/G4 Thunder Tiger Raptor 90/G4 Helicopters


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Old 07-07-2014, 11:08 PM   #1 (permalink)
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Default My N820 quest

I've decided to go 800-size and will post everything about it in this thread.
After the initial frustration of finding many of the necessary parts out of stock I found the E820 parts in stock at experiencerc.com and the edge 813 blades at rcbits.com.au

I'm currently waiting for delivery of these bits:
E820 boom
E820 torque tube
Torque tube bearings
E820 boom support
E820 tail pushrod
Edge 813 main blades
Edge 115 tail blades

My plan is to test with the stock main gear and 20% nitro with my OS105HZR. If power becomes a problem I will re-gear and perhaps increase nitro %.

I'm aiming for a smooth and stable big heli for big-air aerobatic flight.


Will update with pictures and my thoughts as I get the thing together.
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Old 07-11-2014, 12:58 AM   #2 (permalink)
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Parts arrived for boom upgrade. Now waiting on the blades.
Work in progress....
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Old 07-11-2014, 07:31 PM   #3 (permalink)
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keep us updated, i have thought about this too
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Old 07-12-2014, 09:19 PM   #4 (permalink)
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820 boom etc
716 blades, still waiting on the big ones.
Weather not playing-ball unfortunately.
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Old 07-13-2014, 03:09 AM   #5 (permalink)
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Default My N820 quest!

Video!


Sent from my iPhone using Tapatalk
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Old 07-14-2014, 02:14 AM   #6 (permalink)
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My edge 813s are still a couple of days away and a buddy of mine had some align 800 blades spare. I have them a shot, even though it was almost dark.

In short:
Heli seemed HUUUGE all of a sudden
Took a tiny bit longer to spool up
Just hovering and doing climbouts etc the gov could have done with a tiny bit more gain, other than that didn't seem like there was much more load on the engine.
Heli seemed to respond very quickly to changes of pitch.
STABLE!!!

.....did I mention the heli is huge now?

I'll post back when I've had a proper fly with the edge blades! Very very encouraging results so far!
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Old 07-14-2014, 12:27 PM   #7 (permalink)
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So, its a stretched G4 or is there more to it than that. Are the G4 and E820 canopies interchangeable.
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Old 07-14-2014, 01:56 PM   #8 (permalink)
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The E820 is 99.9% a stretched G4.

The E820 has different:
Frame holes allow room for 115t main gear
Frame holes allow extra mounts for tail supports
Changed boom-alignment method inside tail case (apparently)
Thicker FBL arms
Bell-cranks that mount outside of the frames
Reinforced bearing blocks

And of course the 800 stuff:
Big boom
Big boom supports
Bigger blades
Bigger canopy that comes closer to the swash and further back

Lucky for me the G4.1 has all of the same minor upgrades as the e820, except the 800 stuff!

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Old 07-14-2014, 02:02 PM   #9 (permalink)
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Canopies are interchangeable except the 820 needs 2 extra mounting posts which won't fit under the normal g4 one.
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Old 07-14-2014, 05:09 PM   #10 (permalink)
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In your first post you said if power is lacking that you would re-gear. How are you going to do that if you already have the 115 tooth main gear?
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Old 07-14-2014, 05:14 PM   #11 (permalink)
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The g4.1 can accept the 115 gear but doesn't come with one for some reason.
I don't think I'll need to but I could get the 115 or a benario custom gear.
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Old 07-15-2014, 04:49 PM   #12 (permalink)
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I would recommend you go with the Benario 115t main gear and also ask him to make you a 24t tail drive gear..............Especially if you are going to do LHS. That's the setup I'm running on my E820. Run as low as 1100 rpms and up to 1650.

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Old 07-15-2014, 06:00 PM   #13 (permalink)
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I'm quite keen on the Benario gear. What makes it better than the normal 115T?
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Old 07-16-2014, 01:10 AM   #14 (permalink)
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Edge blades arrived.
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Old 07-16-2014, 11:02 AM   #15 (permalink)
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It does look big. Show us a photo with the canopy.

I think you may want the 115 tooth main gear, depending on how you fly and how much collective pitch you run. How does it auto? Have you ever tried slope soaring?
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Old 07-16-2014, 02:58 PM   #16 (permalink)
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Big canopy hadn't arrived yet, but looks fine with the G4 style anyway!
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Old 07-17-2014, 01:52 AM   #17 (permalink)
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Well it went great!

Here is what I've noticed so far:

Tail shifts a little bit more when spooling-up on the ground. No doubt because the 800 blades are heavier.
Very stable and very comfortable in the air, apart from high speed into big gusts!!
Autos so well I can finish a circuit in hold and still have ages to land.
Auto bailout is almost as fast as before.
Minimal difference in fuel consumption.
Need to retune the tail, it kicks on punch-outs
Need to retune the gov, approx 200rpm loss on punch-outs at all HS's.
I'm running 1500, 1750, 1950

Happy!!
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Old 07-17-2014, 01:53 AM   #18 (permalink)
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Pic from today:
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Old 07-17-2014, 04:51 AM   #19 (permalink)
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Nice work Rowan I'm glad I talked you into the conversion, wasn't hard though. And Phil you suck harden up and convert yours
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Old 07-17-2014, 05:06 AM   #20 (permalink)
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The Benario gears will help to get rid of your tail kick on punch outs.
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