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Old Sep 12, 2011, 09:04 PM
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FMS 1400mm BF-109

I recently purchased this FMS BF-109 foamy and found that it flys great and very scale like.. It does, however, like to chase its tail, nose over easily and has a terrible tendancy to roll/turn to the left on take off. I have watched many videos of testing of this warbird and also many still photos of take offs and they all show the same thing ... a bad tendancy to go left on take off. If I take off on our grass field just after it has been cut, the nose over issues is not a severe, but I must still hold full up elevator until signifigant air speed is obtained before I can ease up on the elevator. Flying and landings do not seem to be an issues and they are both typical 'warbird' style of flying. I added an ounce of weight up front as I felt the model was a little twitchy for my taste and that helps smooth things out, but of course it made the nose over problem even a little more of an issue. These models sport retracts and this makes it almost impossible to re-position the landing gear to ease some of the nose over tendanceys ... I am curious if anyone that may have bought this model is experiancing the same issues and if so did you find any solutions.

thanks guys,

Tman
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Last edited by Tman57; Sep 12, 2011 at 10:29 PM. Reason: spelling
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Old Sep 12, 2011, 09:17 PM
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Prescott, Arizona
Joined Feb 2010
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I don't have this bird, But you might find these thread interesting.
http://www.rcgroups.com/forums/showt...t=fms+109+bash

http://www.rcgroups.com/forums/showt...hlight=fms+109

TW
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Old Sep 12, 2011, 10:33 PM
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Hey TW,

I read the two links you offered up, but judging by the dates of these entries, I believe what they are discussing is the old BF 109 which I also believe was smaller.. not 100% on this though ... I believe the 1400mm size is fairly new addition ....


Thanks for your input ... always appreciated !


Tman
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Old Sep 13, 2011, 12:01 AM
4 blades! Scale blades!
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Joined Apr 2006
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Originally Posted by Tman57 View Post
Hey TW,

I read the two links you offered up, but judging by the dates of these entries, I believe what they are discussing is the old BF 109 which I also believe was smaller.. not 100% on this though ... I believe the 1400mm size is fairly new addition ....


Thanks for your input ... always appreciated !

Tman
Tman, try more right rudder on take offs and add forward angle to your landing gear (rake).
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Old Sep 13, 2011, 12:18 AM
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Hi,

The right rudder is a given ... I have been flying RC since the early 80's ... and as far as the landing gear goes, and as I pointed out this model comes with retracts and because of the design and the fact the plane is foam, adjusting the forward angle or any other angle is not an option, but thanks for the suggestions. What I would really like to discover is why this particular model is pulling so hard to the left to begin with. I suppose it could be engine torque, but the FMS 1400mm P-51 does not show this trait and it has the same motor setup.

Tman
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Old Sep 13, 2011, 06:33 AM
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As far as REAL Bf-109s are concerned, more were lost in take-off and landing accidents than in combat.

The reason? Propeller torque, coupled with the narrow track undercarriage and a smallish fin and rudder. This caused a marked torque-induced swing on take-off.

...Just like the model.
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Old Sep 13, 2011, 12:55 PM
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Hey Tally Ho,

I feel that you are on the right track and following my thinking about this issue ... possibly this winter (providing the plane make it until then) I will look into putting some offset on th motor to see if that will help compensate the torque issue a bit without causing other issues ... always comprimises it seems

Thanks,

Tman
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Old Sep 13, 2011, 01:19 PM
got any foam to bash?
Tom Hunt's Avatar
Lake Grove,LI, NY
Joined Aug 2000
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Quote:
Originally Posted by Tman57 View Post
Hey TW,

I read the two links you offered up, but judging by the dates of these entries, I believe what they are discussing is the old BF 109 which I also believe was smaller.. not 100% on this though ... I believe the 1400mm size is fairly new addition ....


Thanks for your input ... always appreciated !


Tman
No, if you bought a 1400mm Airfield/FMS model recently, then you have the "old one" just like those two threads are about.

The "NEW" BF-109F is not out yet and the thread can be found here:
http://www.rcgroups.com/forums/showthread.php?t=1357270
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