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Old Jul 13, 2005, 11:53 AM
starting at RC
Zagreb,Croatia
Joined Aug 2004
61 Posts
Beginner try, will it fly

After six months reading and learning mostly from this forum, I finally came up with something.
This is my own design, not very original, i am afraid but i am happy with it.
I apologize for my bad English and metric meausures.
I was intending to built from depron, but in my country, were is only ONE RC shop, and this one mainly oriented to glow engines and planes with prices 300 % higher then regular US prices, I end up with something like foam from meat trays, but in form of wall ( I do not know the word, things you put on the wall).
Wingspan 900 mm,chord length 140 mm, Jamara speed 400 7,2 V, jamara esc 12 A, old MULTIPLEX Rx 4ch, 2 no-name micro servos, gunther zagi prop 125 x110 mm (4,9 x 4,3 I think), 8,4 V homemade 900 mah AA ni-cd pack.
Weight about 460g.
I got confused with MOTOCALC. It gave me with same setup current of 5,4 A but I mesured with good quality Fluke instrument direct from battery to neutrally timed motor current of 6,5 A. Any comment?
I am also not shure about CG.
P.S. Magnets mounts for motor and hood!
P.S.2 I must change the rear wheel!
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Old Jul 13, 2005, 12:08 PM
semper ventosus
weather_man's Avatar
Sasebo, Japan
Joined Jun 2004
992 Posts
It looks very cool to me. Give it a test glide and see what it does. Good Luck!
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Old Jul 13, 2005, 12:18 PM
Wheels up!!!
Pelham, Alabama
Joined Jun 2005
262 Posts
[QUOTE=zoohr]
I apologize for my bad English QUOTE]

Looks good. Do what the Weather man said and give it a glide test.

Why apoligize, you spell better than I do.
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Old Jul 13, 2005, 12:23 PM
Registered User
Fort Collins, CO USA
Joined Jun 2005
164 Posts
That looks very nice - I can understand why you are hesitant to fly/crash it Find somewhere soft (long, springy grass or something) and give it a hand-toss and see how it glides. Also, ensure that your CG seems appropriate in relation to the wing (someone else can provide tips on how to locate the best CG I'll bet).

Mike
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Old Jul 13, 2005, 12:26 PM
starting at RC
Zagreb,Croatia
Joined Aug 2004
61 Posts
I will give it glide test tommorow, if the rain stops.
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Old Jul 13, 2005, 12:51 PM
Ascended Master
Sparky Paul's Avatar
Palmdale, CA
Joined Oct 2000
13,499 Posts
For your c.g., put it at 25% of the root chord. No more than 30% back.
It should be a good gentle flier.
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Old Jul 14, 2005, 02:14 AM
Registered User
Ron H's Avatar
Bishopville S.C.
Joined May 2003
4,056 Posts
Yes
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Old Jul 14, 2005, 07:53 AM
Registered User
Letchworth, Great Britain (UK)
Joined Jul 2004
11,875 Posts
Quote:
Originally Posted by zoohr
I was intending to built from depron, but in my country, were is only ONE RC shop, and this one mainly oriented to glow engines and planes with prices 300 % higher then regular US prices, I end up with something like foam from meat trays, but in form of wall ( I do not know the word, things you put on the wall).
Looks very good

I've got one question though; it looks to me like the wings are made out of balsa sheet with white foam (is that the wall "tiles"?) on top to make the shape. The balsa looks like it's crossways, which is not very strong. Have you got wood beams ("spars") running along the length of the wing inside the foam?
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Old Jul 14, 2005, 10:25 AM
new B
hump's Avatar
Arkansas Ozarks
Joined May 2005
72 Posts
The material you have used is unfamilar to me, but it appears to be a foam based interior wall paneling with a simulated wood grain finish?
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Old Jul 14, 2005, 10:42 AM
starting at RC
Zagreb,Croatia
Joined Aug 2004
61 Posts
The wings are made from wall panel foam with white foam on top glued together, and sanded in shape. 3 parts are glued together with epoxy and all edges reinforsed with hot epoxy painted with ordinary small brush.
Yes hump, you are right. Thats the only material I can find similar to depron,
but it can't be bend like one, it often brake.
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Last edited by zoohr; Jul 14, 2005 at 10:49 AM.
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Old Jul 14, 2005, 11:24 AM
Plane dodger
KillerAir's Avatar
Stratford Sikorsky, Connecticut, United States
Joined Dec 2001
6,715 Posts
Looks good, don't know about the motor magnets for a mount, might not hold.
Personally I would not glide test. I would fly it on power, you should have an experienced pilot maiden for you if you are just starting up as a flyer.
Great job and good luck.

Killer
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Old Jul 14, 2005, 11:41 AM
Linux addict
Ekim's Avatar
S. Jersey, US, the 51 state
Joined Oct 2004
289 Posts
How heavy is it? try not to be much over 20oz...........better 15oz
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Old Jul 14, 2005, 11:55 AM
starting at RC
Zagreb,Croatia
Joined Aug 2004
61 Posts
460 g = 16,26oz
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Old Jul 14, 2005, 12:09 PM
Permanently Banned
hoverboy7's Avatar
San Antonio Intl, Texas, United States
Joined Jul 2004
606 Posts
i think you should rubber band or zip tie that motor in.
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Old Jul 14, 2005, 12:38 PM
starting at RC
Zagreb,Croatia
Joined Aug 2004
61 Posts
Motor is secure enough. It is designed that way if the plane hits the ground or tree, motor and hood goes off. I had tried with full power, and shake fast the plane in all
direction and motor stood in place.
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