This thread is the Freewing... I had the Dynam.
I suspect the same thing is gong on here.
At recommended CG, the Dynam did not like inverted at all, dropping the nose with full down elevator (which is supposed to hold the nose up when inverted)
I checked CG vs MAC and it was WAY noseheavy vs the standard rule of thumb 25% to 35% MAC.
Pushing CG back to 30% improved inverted but didn't cure it.
However this created an issue where low speed and high throttle would pitch up the nose uncontrollably.
I had a chance to discuss Me-262 characteristics with pilot of one of the full scale reproductions.
The nose pitches up significantly with high power at low speed. They CAN NOT apply full throttle before the airplane is well off the ground and has built up speed. (especially with the higher power engines in the reproduction)
The models are recommending CG way forward to prevent someone causing the airplane to do 3/4 loop on take-off when using full throttle.
Compensating for this, the horizontal stab is mounted with significant "decalage" (different incidence of main wing vs tailplane) in order to allow you to keep the nose up (upright) at less than 3/4 throttle.
Nose heavy and the decalage will result in the airplane not being capable f sustained level inverted.
I modified the Dynam with in-flight adjustable horizontal stab incidence (like the full scale has) and with the adjusted CG, was able to do an outside loop.
Full scale ME-262 pilot holding my Dynam Me-262.
(still can't make linked pictures work)
In flight adjustable horizontal stab incidence
I suspect the same thing is gong on here.
At recommended CG, the Dynam did not like inverted at all, dropping the nose with full down elevator (which is supposed to hold the nose up when inverted)
I checked CG vs MAC and it was WAY noseheavy vs the standard rule of thumb 25% to 35% MAC.
Pushing CG back to 30% improved inverted but didn't cure it.
However this created an issue where low speed and high throttle would pitch up the nose uncontrollably.
I had a chance to discuss Me-262 characteristics with pilot of one of the full scale reproductions.
The nose pitches up significantly with high power at low speed. They CAN NOT apply full throttle before the airplane is well off the ground and has built up speed. (especially with the higher power engines in the reproduction)
The models are recommending CG way forward to prevent someone causing the airplane to do 3/4 loop on take-off when using full throttle.
Compensating for this, the horizontal stab is mounted with significant "decalage" (different incidence of main wing vs tailplane) in order to allow you to keep the nose up (upright) at less than 3/4 throttle.
Nose heavy and the decalage will result in the airplane not being capable f sustained level inverted.
I modified the Dynam with in-flight adjustable horizontal stab incidence (like the full scale has) and with the adjusted CG, was able to do an outside loop.
Full scale ME-262 pilot holding my Dynam Me-262.
(still can't make linked pictures work)
In flight adjustable horizontal stab incidence
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