Fokker DR-1 Balsa USA, HELP HELP  
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All Forums >> RC Airplanes >> Kit Building >> Kit Manufacturer Direct Support Forum >> Fokker DR-1 Balsa USA, HELP HELP
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Fokker DR-1 Balsa USA, HELP HELP - 7/8/2007 2:16:20 PM   
ofirby


 

Posts: 10
Joined: 11/1/2005
From: GivatiimIsrael, ISRAEL
Status: offline 		Hi,

I have build Fokker DR-1 of Balsa USA 1/4 scale and in test flight I was in problem and CRASH !!!.
The Fokker start "be erect" and move up all the time. Even when I move the remote control set-off to full Down, still the airplane move up. The only way to move it down was close littele bit the throttle.
Before I flight it, i check the balance and it was ok. I build the kit step by step about 7 mounth and use Zenoah 26.

Do you familiar this kind of problem ? do you know the reason of this ?

Thank you in advanced,
Ofir
       Post #: 1

RE: Fokker DR-1 Balsa USA, HELP HELP - 8/31/2007 4:36:59 AM   
BULL-RCU



Posts: 1183
Joined: 6/1/2003
From: Webster, NY, USA
Status: offline 		I have a DR-1 and several biplanes. They all tend to want to climb more then single wing planes. I have run into this problem myself when testing planes and usually it's due to Wing incedence. usually positive on the top wing.

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(in reply to ofirby)
       Post #: 2

RE: Fokker DR-1 Balsa USA, HELP HELP - 10/2/2007 4:20:47 AM   
boothg-3


 

Posts: 24
Joined: 4/20/2005
From: rhome, TX, USA
Status: offline 		i have the same aircraft and almost lost it on the test flight because of the problem , it has to do with the lift of the three wings and the light weight aircraft , if you have a computer radio start by setting up a program that mixes in some down elevator at 1/2 throttle and above start with 5% elevator and only at 1/2 throttle and above , i also recommend increasing the downthrust of the engine i set mine to 3 degrees down and 3 degrees right thrust , and it still requires a little elevator mixing to throttle input , the reason is as teh air speed increases so does the lift of the wings , nick ziroli actually has the leading edge of the horizontal stab a few degrees higher than the trailing edge to offset thsi condition on his DR-1 try it and it will fly fine i have had mine now for 6 years and dont forget right rudder on take off

(in reply to BULL-RCU)
       Post #: 3

RE: Fokker DR-1 Balsa USA, HELP HELP - 10/2/2007 7:49:29 AM   
ofirby


 

Posts: 10
Joined: 11/1/2005
From: GivatiimIsrael, ISRAEL
Status: offline 		I increase the downthrust of the engine to 4 degrees down and 3 degrees right thrust, Also I increase stabilizer to 2 positive degrees and the highest wing also to 2 positive degrees and its helps a lot. Finely I could fly the Fokker-DR as real plane.

(in reply to boothg-3)
       Post #: 4

RE: Fokker DR-1 Balsa USA, HELP HELP - 10/3/2007 4:42:52 AM   
boothg-3


 

Posts: 24
Joined: 4/20/2005
From: rhome, TX, USA
Status: offline 		i wouldnt increase the incidence of the upper wing leave it at zero or even give it 1 or 2 degrees of negative , by having negative incidence in the upper wing it continue to have lift after the others stall at low speed ,with positive incidence it will stall before the others

(in reply to ofirby)
       Post #: 5

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