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Old Feb 28, 2015, 05:17 PM
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Terry Rigden's Avatar
UK, Bedworth
Joined Apr 2004
3,019 Posts
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

Terry
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Old Feb 28, 2015, 05:28 PM
Vanadu
Heavy Chevy's Avatar
Canada, YT, Whitehorse
Joined Dec 2008
3,876 Posts
Quote:
Originally Posted by Terry Rigden View Post
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

Terry
Thanks! I'll try it out. Helps a bunch.
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Old Feb 28, 2015, 05:43 PM
flyin' fool
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Vancouver Island, Canada
Joined Jul 2003
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Too tail heavy
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Old Feb 28, 2015, 05:45 PM
chuck
santa barbara, CA
Joined May 2009
4,423 Posts
Quote:
Originally Posted by goldguy View Post
Too tail heavy
yep ..the aerobatics glory spec
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Old Feb 28, 2015, 05:54 PM
flyin' fool
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Vancouver Island, Canada
Joined Jul 2003
7,479 Posts
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.
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Old Feb 28, 2015, 06:34 PM
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davereap's Avatar
Ashford. Kent. England
Joined Feb 2005
7,141 Posts
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
.
ZagiFlutter (1 min 50 sec)
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Last edited by davereap; Mar 01, 2015 at 02:51 AM.
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Old Feb 28, 2015, 11:15 PM
Vanadu
Heavy Chevy's Avatar
Canada, YT, Whitehorse
Joined Dec 2008
3,876 Posts
^^THanks guys ^^

Lost of things to try out now!
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