Landing Top Flite P51 with Flaps  
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All Forums >> RC Airplanes >> RC Warbirds and Warplanes >> Landing Top Flite P51 with Flaps
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Landing Top Flite P51 with Flaps - 6/13/2008 11:09:46 PM   
lensfriend


 

Posts: 4
Joined: 12/26/2003
From: Southlake, TX, USA
Status: offline 		I just completed a Top Flite P51 1/7 th scale P51. It weighs approximately 91/2 lbs and will be powered by an OS 91FX with a 15X6 prop. I have flaps and would like to know how this model lands with flaps. The field I fly from is surrounded by trees, so a long shallow final approach is out of the question.

Thanks for your input.
       Post #: 1

RE: Landing Top Flite P51 with Flaps - 6/13/2008 11:53:17 PM   
jrod1019


 

Posts: 25
Joined: 12/16/2007
From: key west, FL, USA
Status: offline 		15x6 might be to much prop for the o.s.91fx. 14x6 should be better- prop for 10,500 to 11,500 on the ground and the motor will be happer.

(in reply to lensfriend)
       Post #: 2

RE: Landing Top Flite P51 with Flaps - 6/14/2008 1:40:03 AM   
MANFRED



Posts: 808
Joined: 1/26/2002
From: san diego, CA, USA
Status: offline 		Actually flaps are better used without the long drawn out approach. I used to be quite happy with my TF Corsair and a short steep carrier style approach using flaps. Just remember, don't flair too early, keep a little down nose in your approach, and don't speed up on the downwind leg.

_____________________________

Life is too short to fly ugly planes!

(in reply to jrod1019)
       Post #: 3

RE: Landing Top Flite P51 with Flaps - 6/14/2008 2:58:25 PM   
JIMARRINGTON


 

Posts: 590
Joined: 8/17/2004
From: NEW BOSTON, TX, USA
Status: offline 		I agree on the prop. I fly my H9 P-40 with an OS 91 FX and a 14x6 prop. More than enough power. Most times I fly at 1/2 throttle. A 15x6 is getting a little too big for this motor. I had this motor on a U-Can-Do 60 size before and tried to fly it with the 15x6 and it lugged the motor down pretty good. It was ok for the slow flying U-Can but you will want more pitch speed with a warbird.

Jim

(in reply to MANFRED)
       Post #: 4

RE: Landing Top Flite P51 with Flaps - 6/14/2008 5:21:56 PM   
Steve_S-RCU


 

Posts: 69
Joined: 3/9/2002
From: Portland, OR,
Status: offline 		Hi lensfriend,

Check out this at

http://www.rcwarbirds.com/Techniques/Technigues.htm#t1

(in reply to JIMARRINGTON)
       Post #: 5

RE: Landing Top Flite P51 with Flaps - 6/14/2008 11:23:35 PM   
lensfriend


 

Posts: 4
Joined: 12/26/2003
From: Southlake, TX, USA
Status: offline 		Steve-S

Excellent input. Everyone should have a copy.

Lensfriend

(in reply to Steve_S-RCU)
       Post #: 6

RE: Landing Top Flite P51 with Flaps - 6/15/2008 2:33:27 AM   
warks62



Posts: 594
Joined: 12/25/2003
From: Fresno, CA, USA
Status: offline 		Just a bit of input on this motor and prop. When I was breaking in the motor I used a 13-8 then went to a 13-9 after a gallon. Then flew another 2 gallons on that then went to a 14-8. I also tried a 13-10 which gave me more speed but I lost a lot of vertical. Went back to a 14-8 and stayed with it. Gave me great speed and extreme vertical. This was on a WM P-51 60 size that had been glassed and painted. Very similar to your mustang. I used a Bisson pitts muffler which with the 14-8 APC prop gave it a very nice none 2-stroke sound had a very distinct throaty sound which I was complemented on several times. All the props had been APC but when it was broken in the 14-8 APC was the perfect prop to me.

_____________________________

Randy, member of the true 1/6th Royal Corsair Build

(in reply to lensfriend)
       Post #: 7

RE: Landing Top Flite P51 with Flaps - 6/15/2008 2:53:13 AM   
paladin


 

Posts: 1610
Joined: 2/13/2002
From: Vestal, NY, USA
Status: offline 		Lensfriend, the first problem I see with flaps is their set up. They need to be as crisp at the endpoints as Ailerons or elevator. Both ends of the flap need to be able to resist a finger push crisply. If it has any spongyness when deployed you will never get it to grove and always be on the ailerons. Read this thread, I think it will answer most of your questions.

http://www.rcuniverse.com/forum/m_3493781/mpage_1/key_/tm.htm


_____________________________

If it don't fly it wont ketch my eye.

(in reply to lensfriend)
       Post #: 8

RE: Landing Top Flite P51 with Flaps - 6/15/2008 3:43:51 AM   
lensfriend


 

Posts: 4
Joined: 12/26/2003
From: Southlake, TX, USA
Status: offline 		Paladin,
Just ran through your posted thread. It'll take me about a day to fully digest but the first time through indicates a lot of thought went into it. By the way it seems to be dead on technically as far as the function of the flap versus angle of deployment. Initially, more lift than drag and than increased drag with minimal increase in lift.

I will not use flaps, even partially during take-off.

Lensfriend

(in reply to paladin)
       Post #: 9

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