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Old 11-17-2006, 04:34 PM
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Kiwi F3P Git'n 'R Dun!

This is my new design for indoor, It's been a good few months of on and off working in 3D to get this far. I don't think it looks like much else out there.

Construction is all 3mm depron, power system will be a 2205/34 Hyperion, 2S 800, CC10 and 8x4 GWS. Pico's on the tail and a single Naro on the ailerons. Throughout the build I will attempt to cut down weight wherever possible. AUW is hopefully around the 6oz mark.

PS: Max, can I have 30 days from now??
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Old 11-17-2006, 06:30 PM
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Re: Kiwi F3P Git'n 'R Dun!

After the previous post we suffered a power surge, and lost our internet connection for a few hours.

Back on track: I've incorporated some aerodynamic widgets into the design for the first time, in an attempt to keep the speed of the model manageable, and aid in maneuverability. I didn't come up with this stuff, but rather implemented it from what I have read in other places.

Firstly, The SFG's are canted toe out, So that in K/E, the upper SFG is at a higher angle of attack than the lower one, causing more drag above the centerline, this reduces the need for alot of rudder to keep the model in the correct alpha, however it is a balancing act, too much toe-out and the model will become unstable in the yaw axis during normal flight.

The second widget is perforations on the control surfaces, the theory is that when deflected, the air is forced through the holes, causing more drag than if they weren't there.

The third, and probably the most radical looking, is the stepped leading edge. This should help with tip-stall characteristics, The tips have more wing area than the roots, so the root of the wing should stall earlier. I believe this has the same effect as wash-out, but it has the advantage that it also works while inverted, and you don't compromise lift. Wash-out actually becomes wash-in when inverted, causing some models to have wicked tip stalls when inverted! This MAY also help with wing-rock in Harrier, but that is yet untested. Gives it a kinda bat-plane look though don't it?

During the design of the fuselage profile, I spent a significant amount of time getting the aerodynamic center of the fuse as close to the centerline of the wings/tail/thrust as possible. The idea is that this will help get rid of some roll coupling in knife edge, The pitch coupling should take care of itself with all the draggy bits on the thrust line in typical shockie fashion.

This design is actually over-square. That is, it is longer than it is wide, this is due to me stretching our the rear of the fuselage significantly, in an attempt to aid precision and stability in the hover.

In essence, this is TLAR design with a little thought and precision involved. Although, I make no guarantees as to its flight abilities (if any!)
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Old 11-17-2006, 07:02 PM
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Re: Kiwi F3P Git'n 'R Dun!

Currently I am waiting for depron and bits to come from up north. Construction is due to start next week sometime. I've also got a rather patriotic NZ colour scheme up my sleeve.

I've managed to ring in my good mate Alex Hewson to help me out with getting the design in the air. Expect to hear from him soon.
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Last edited by SargeNZ; 11-17-2006 at 10:21 PM.
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Old 11-17-2006, 07:15 PM
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Re: Kiwi F3P Git'n 'R Dun!

Nicely thought out design. Good job on doing your homework before getting out the depron and makin scraps.

I look forward to a flight report.

BTW, I have most of the same 'widgets' on my Sentinel F3P design and have been pleased with the results. My suggestion would be to put them on with small amounts of glue so you can move them around to maximize their effectiveness after the fact. I moved most of my elements at least once....
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Old 11-17-2006, 10:29 PM
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Re: Kiwi F3P Git'n 'R Dun!

Right, I'm here man.

First step will be to print out the plan...

Then cut out the parts....
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Old 11-18-2006, 03:17 AM
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Re: Kiwi F3P Git'n 'R Dun!

Take one plan, and one sheet of 3mm Depron, and in 20 min... Hey Presto!!!! One kit of parts for a Kiwi F3P!
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Old 11-18-2006, 03:40 AM
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Re: Kiwi F3P Git'n 'R Dun!

Looking good guys

Please let us know how it flies
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Old 11-18-2006, 10:35 AM
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Re: Kiwi F3P Git'n 'R Dun!

Just a suggestion for your next one. Don't notch the wing so deeply for your SFGs. Frankly, I would not notch it at all. Just butt joint glue them top and bottom to the wing. With your notch, you compromized the strength of the wing by half!
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Old 11-18-2006, 05:07 PM
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Re: Kiwi F3P Git'n 'R Dun!

Thats a very smart suggestion Matchless.... I feel silly

I will do that with my build.... Sorry Alex .... Just don't get too far head of me on the build man, I've still got to get depron!
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Old 11-20-2006, 03:20 AM
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Re: Kiwi F3P Git'n 'R Dun!

Im trying to think what bracing to use, where to use it, and how to do it.

I was thinking full TE 3x1 batten and on the front stepped part. Maybe then the full length depron gussets on the top of the fuse. And probably a 3x0.5 batten as a fin post on the rudder hinge line to strengthen that tail up.

Maybe some spider line here and there.
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Old 11-20-2006, 03:31 AM
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Re: Kiwi F3P Git'n 'R Dun!

Just found this http://www.rcgroups.com/forums/showthread.php?t=599333 should be useful
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Old 11-22-2006, 05:31 PM
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Re: Kiwi F3P Git'n 'R Dun!

Holey moly!!!!

Just waitin for some glue to arrive now, then it'l be non-stop building action :fencing:
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Old 11-23-2006, 04:26 AM
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Re: Kiwi F3P Git'n 'R Dun!

Quote:
Originally Posted by ampEater View Post
Holey moly!!!!
You are a sad person Looking good dude.

I've got the foam bits cut-out and 3mm batten on both edges on the wing. Unfortunately my parents have hiked off to oz-land and taken the digital camera

I'll have it back on Monday. Stay tuned.
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Old 11-23-2006, 06:53 AM
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Re: Kiwi F3P Git'n 'R Dun!

How did you cut all those triangles in the trailing edges of the surfaces?
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Old 11-23-2006, 04:20 PM
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Re: Kiwi F3P Git'n 'R Dun!

With a scalpel, a patient hand and alot of time

I drew them on by hand first then poked the scalpel through to cut them out.
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