|Feb 28, 2015, 05:17 PM|
Try putting it into a shallow dive (30 degrees) with the power off and let go of the sticks, does it pull up by itself? If not then the CG is too far aft. Then do it again with power does it pull up sooner or later? If it takes longer to pull out with power on then you have too much downthrust sooner not enough. Hope this helps
|Feb 28, 2015, 05:28 PM|
|Feb 28, 2015, 05:54 PM|
All LAR flatties have pitch issues and tail heavy only makes matters worse. As stated above, tail heavy is for silly stuff and nose heavy is for speed.
Although, the NutBall is not a park jet, nor meant to be.
|Feb 28, 2015, 06:34 PM|
Some of our early bigger depron nutballs did suffer from flexing brought on by the constant stressing of the model while doing wild stuff.. stressing the foam made it soft..this resulted in tucking/diving down at speed...
The normal cog was setup at 25% with a bit of "up " trim, but this "up" was just flattening out with the speed, so the model began diving, and it became reluctant to pull out, because the elevator was being pushed back down..
When they were first built all was fine.. only after a few to several months did this tucking problem started up...
these were single layer builds in excess of 24" span..
When I went to stiffer KF builds I also used stiffer splines and the extra stiffness of the build stopped the problem...
So basically its keep it stiff...
you can stiffen up the model with spars or use my favourite, a pallet strapping sandwich.. going down the length , across the wing you will likely already have spars
If you have never seen the results of constantly stressed foam getting soft,
here is a Zagi flapping.. all due to the originals not having spars fitted, they were only taped for stiffness
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