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I flew my P-40 !!!

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Old 04-28-2003, 02:21 AM
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fourstar40
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Default I flew my P-40 !!!

I finally got some time and good weather to fly my P-40. As everyone had mentioned in previous posts that this plane has a tendency to snap at slow speeds. Well, I did get to see it but luckily it happened over a freshly plowed farm fields and the ground was really soft so no damage to the plane. I will say that it was at a very slow speed that it happened. The engine quit and was forced to make a quick landing. I had engine problems the whole time but found out the muffler was loose. However, the times I did fly which was for maybe 5 or 6 minutes, it flew great. Take off was a breeze and I didn't have problems at all with ground handling. I had about a 15MPH head wind to work with so it wasn't on the ground very long. Once in the air this bird is gorgeous. The guys at the field were giving me the ole,OOO's and awe's. The elevator is a bit touchy but thats because of the short tail movement. I can't wait to fly it again. But first I have to fix the muffler so it doesn't come loose again.

Once agin i would like to THANK everyone who helped me through the building and flying process of this magnificant Warbird. Warbirds rule!!!
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Old 05-01-2003, 10:19 AM
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Default I flew my P-40 !!!

thats great man! Im sure ballanced properly, its a good flying plane. Touchy elevator is also due to a rearward c of b. You could move the battey up a little or add a little nose weight to make it less touchy. Good luck in the future with the shark!
d
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Old 05-01-2003, 01:10 PM
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Default P-40 and CG

Glad you had a ball with it. Just in case it has been missed, you really have to balance this plane gear UP if it has retracts. The weight of the gear gives a big change in CG when it is retracted. Even more so if you put the robo struts and scale wheels on it.

I lost my first one due to the same reasons. My second one flew much better and the snapping all but went away. The second item is the flaps. They make a huge difference with the snapping problem as well.

Hope you get many years of fun out of her! Hans
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Old 05-14-2003, 01:37 AM
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Default I flew my P-40 !!!

WHERE DID YOU PUT THE CG!
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Old 05-14-2003, 01:53 AM
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Default I flew my P-40 !!!

The C.G. is just a hair nose heavy. In other words, about a quarter of an inch forward of the exact C.G.

BTW, I am using fixed gear so I don't have to worry about when the gear is retracted. And when I say a little touchy, the elevator is a tad bit sensitive but not where it is hard to fly or unstable.
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Old 02-10-2005, 07:05 PM
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Default RE: I flew my P-40 !!!

Thanks. That's just about where I have moved mine back to. I went to fly it today but realized at the field I had left the TX on all night. It is magnificant in the air.
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Old 02-10-2005, 09:34 PM
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timothy thompson
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Default RE: I flew my P-40 !!!

Did the flaps make it worse or better should be better?? I have a pica 1/5 p-40 no problems I use full flap balanced wheels up no touchy elevator
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Old 02-10-2005, 09:48 PM
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Default RE: I flew my P-40 !!!

Are we talking about the TF P-40 here or some other P-40 that I don't know about? The P-40 is more gorgeous in the air with the wheels up inside the wing. It's a sin to fly a P-40 with wheels hanging down.
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Old 02-10-2005, 10:25 PM
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Default RE: I flew my P-40 !!!

excellent, may u have more flights then I did!!
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Old 02-11-2005, 06:47 AM
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Default RE: I flew my P-40 !!!

I thought that planes with retracts balanced with the wheels down not up
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Old 02-11-2005, 09:38 AM
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Default RE: I flew my P-40 !!!

Think about it. What if you balance the P-40 with the wheels down and then retract the wheels into the wing? The CG would shift rearward. Believe me, you do not want a tail heavy warbird. A nose heavy warbird will fly just fine. A tail heavy warbird will crash.
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Old 02-11-2005, 02:18 PM
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udi maman
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Default RE: I flew my P-40 !!!

in all my war birds the nose is heavy
that is the best way to keep them in one pice
if you want to work or to see if epoxy is a good glue for r/c war birds then the best and the sure way to do it is to make the tail heavy
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Old 02-12-2005, 12:07 AM
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Default RE: I flew my P-40 !!!

Mine is balanced slightly ahead of the cg with the wheels down, empty tank. I figure once you fill the tank, you are more nose heavy. Assuming you will land with some fuel left and wheels down, you are still nose heavy. I havent flown it in this configuration yet. I did fly it when it was balanced wheels up and it sort of porposed on final; 15 degrees flaps, dead engine during half of the final approach. But it didn't snap and thats a problem i'd been having on dead engine landings.

What's your thoughts?

Carl.
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Old 02-12-2005, 12:22 AM
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Default RE: I flew my P-40 !!!

Let me add that on one of my p-40's I balanced it right on the button, wheels down, took off, went high, dead stick, wheels up and it snap roll as soon as I tried to flatten the glide. I recovered, dropped the nose and headed for final. As soon as I attempted to flatten it out near the end of the runway about four feet off the ground, it snapped inverted and went in. The strange thing about the snap was that it went inverted and stay there. Naturally since I had a touch of up elevator, it went in. I never dropped the gear, which might have saved it.
Now somebody out there has the right combination and it would save the rest of us p40 lovers a lot of heartache, landing gear, and money if you could share your sucessful setup with us. I keep one set of Century jets in repair and one on the plane. I might have to get one more so that one will be on the way back at the rate I'm going. But I'm determined to get it right. I love this Warbird.
Thanks guys.
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Old 02-12-2005, 12:44 AM
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Default RE: I flew my P-40 !!!

ORIGINAL: Texan2

Let me add that on one of my p-40's I balanced it right on the button, wheels down, took off, went high, dead stick, wheels up and it snap roll as soon as I tried to flatten the glide.
There is your problem. As already stated several times before by me and others, you MUST balance the plane with the wheels up. What happened when you brought the wheels up into the wing? Yep, the CG shifted back and the plane snapped. In a deadstick situation, I would leave the wheels down to keep the CG forward unless the plane can't make it back to the runway.

The right combination is revealed in this thread: [link=http://www.rcuniverse.com/forum/m_2507688/mpage_1/key_/tm.htm]TF P-40E in Action[/link]
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Old 02-12-2005, 12:50 AM
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Default RE: I flew my P-40 !!!

By the way, watch my landing videos carefully with full 40° flaps to see if you can detect any porposing.
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Old 02-12-2005, 02:32 AM
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Default RE: I flew my P-40 !!!

richard
nice plane and very good landings
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Old 02-12-2005, 03:41 AM
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Richard L.
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Default RE: I flew my P-40 !!!

udi, thanks for the compliments.
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Old 02-12-2005, 10:31 AM
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Default RE: I flew my P-40 !!!

Thanks for the info Richard. It totally makes sense and I p[lan on doing it that way. Whats scary is why does TF not correct it in thier instructions.

Thanks,
Doug
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Old 02-12-2005, 10:52 AM
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Default RE: I flew my P-40 !!!

TF instructions are fine if you use wire struts with very light foam wheels. In this case, the CG would not shift back very much when you bring the struts and wheels back into the wing. On the other hand, if you use heavy oleo struts and scale wheels, then care must be taken. You could balance the plane with the wheels down and jot down where the CG is, then balance the plane with the wheels up and jot down where the CG ends up. Finally, take the mid point between the two numbers that you wrote down and balance the plane with the wheels up.
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Old 01-02-2006, 03:32 PM
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Default RE: I flew my P-40 !!!

There is a video of my tf p-40 landing at this web address. http://media.putfile.com/p-40e-landing


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Old 01-02-2006, 03:39 PM
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Default RE: I flew my P-40 !!!

Carl, very nice landing. You greased that one. It landed beautifully with flaps.
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