Alfa model p-51 mustang "balloning" effect?? - RC Groups
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Nov 26, 2006, 09:33 PM
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Alfa model p-51 mustang "balloning" effect??


Hey guys just finished up a alfa models p-51D mustang that i got for my bday....for the first maiden the plane wants to climb clim climb on its own under full power! I followed all instructions and went through all diagrams a 100 times...i have the recommend 2mm up on the ailerons too. How would i be able to fix this with out mixing in some elevator as i throttle up? Dont get me wrong, the plane looks great but the auto climb makes the plane hard to fly. Anyone out there with P-51 experience? Oh i've tried also the down thrust and right thrust optoins as well, but dont know how much is needed for the plane to actually feel its effects, i have 2mm of this thrust. Thanks in advance for all that reply!
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Nov 26, 2006, 09:39 PM
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Try taking the 2 mm off the ailerons. if that doesnt work well then try mixing (if you can)on your controller a little down elevator when you have full throttle.
Nov 26, 2006, 09:48 PM
Maz
Maz
Mig Killer
Maz's Avatar
Quote:
Originally Posted by DeuUaH
Hey guys just finished up a alfa models p-51D mustang that i got for my bday....for the first maiden the plane wants to climb clim climb on its own under full power! I followed all instructions and went through all diagrams a 100 times...i have the recommend 2mm up on the ailerons too. How would i be able to fix this with out mixing in some elevator as i throttle up? Dont get me wrong, the plane looks great but the auto climb makes the plane hard to fly. Anyone out there with P-51 experience? Oh i've tried also the down thrust and right thrust optoins as well, but dont know how much is needed for the plane to actually feel its effects, i have 2mm of this thrust. Thanks in advance for all that reply!

I had the same problem with mine. I think I have 3 washer on the top bolt in between the motor and firewall. This helped, but I still have to fly with the elevator down about and 1/8 of an inch. I also have my cg forward of the recommended cg. Once you get this plane dialed in, it will be your best flying plane.


Dave
Nov 26, 2006, 09:56 PM
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alienx's Avatar
Quote:
Originally Posted by Maz
I had the same problem with mine. I think I have 3 washer on the top bolt in between the motor and firewall. This helped, but I still have to fly with the elevator down about and 1/8 of an inch. I also have my cg forward of the recommended cg. Once you get this plane dialed in, it will be your best flying plane.


Dave
I did just what Maz said too. I had just about an 1/8" of down elevator in it to get it trimmed. Mine flew with the large MP Jet blue motor and an APC 8x6 SF prop. It flew very nicely after you got used to the tendency to climb. It's a good looking bird in the air too. I had the Marie.

Enjoy the plane!
Nov 27, 2006, 05:24 PM
Registered User
are there any threads that cover this problem??? If anyone knows of this please list the links? thanks guys
Nov 27, 2006, 05:37 PM
Registered User
try shimming the front of the wing so that angle of incidence is slightly and add more downthrust to the motor.
Nov 27, 2006, 05:38 PM
Registered User
more downthrust to the motor is probably the anser if the plane flies level shortly after power off.
Nov 28, 2006, 10:13 AM
Reserved Parking
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I have the B model, and it does it also. Shimming the motor really didn't take care of it on mine.

This is discussed in various alfa threads on here, I think most of the conclusions have been that the mustangs just don't fly as well as some of the other alfas.
Nov 28, 2006, 10:22 AM
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alienx's Avatar
Quote:
Originally Posted by P-51C
I have the B model, and it does it also. Shimming the motor really didn't take care of it on mine.

This is discussed in various alfa threads on here, I think most of the conclusions have been that the mustangs just don't fly as well as some of the other alfas.
I didn't get any benefit from the shim either. I just trimmed with down elevator and then got used to flying with down stick everytiem I came out of a dive. The plane flies fine, just wants to pop up. But you get used to it just like any other plane's subtle characteristics.
Nov 28, 2006, 01:58 PM
Reserved Parking
P-51C's Avatar
The problem I had was that with the down elevator, it behaved quite differently at low speed vs flight speed. In order to launch, I would have to trim the elevator level, then adjust it down again. I found out the hard way that if you forgot, and left it trimmed down during launch that the nose smashes quite a bit.
Nov 28, 2006, 02:07 PM
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alienx's Avatar
Quote:
Originally Posted by P-51C
The problem I had was that with the down elevator, it behaved quite differently at low speed vs flight speed. In order to launch, I would have to trim the elevator level, then adjust it down again. I found out the hard way that if you forgot, and left it trimmed down during launch that the nose smashes quite a bit.
I did have to be attentive on launch as well. But I could always launch and then get on the elevaotr. Scary the first time you do it though.
Nov 28, 2006, 02:24 PM
Registered User
cant u combat this by just mixing down elevator when u go to full throttle?
Nov 28, 2006, 04:21 PM
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alienx's Avatar
Quote:
Originally Posted by DeuUaH
cant u combat this by just mixing down elevator when u go to full throttle?
I guess you could. I never bothered. If launch is a worry, just launch a little higher than level.
Nov 28, 2006, 04:27 PM
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Mike Smart's Avatar
I would second taking the 2mm up off of the ailerons.

Mike
Nov 28, 2006, 05:39 PM
Registered User
Hey Mike....really? Take the 2mm off the ailerons? I had thought that with the 2mm up on the ailerons they were trying to fix this ballooning....something about wing defection or something? You are the second person that has told me to get rid of this too but im still hesitant to do so....im totally confused now!! So what does what?


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