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Kolb Ultrastar center and balance

 
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Viktors.Zarskis



Joined: 16 Jul 2019
Posts: 3

PostPosted: Tue Jul 16, 2019 11:02 am    Post subject: Kolb Ultrastar center and balance Reply with quote

Hello!
I am close to finish building my Kolb Ultrastar.
I wanted to check balance point of the plane but have doubts that I understand the manual correctly.

In the manual it is written:

The "Ultrastar" should balance [with the pilot in the seat] at the 25% to 30% chord position. This translates to the balance point being located in the range from 16" to 19" from the leading edge of the wing. The centerline of the 1" square tube that the wings attach to is 18" from the leading edge. To check the balance hang the Ultrastar from a point within this 3" range, and with the pilot sitting in the seat the plane should balance. The fuselage tube will be at 10 to 12 degree angle [tail lower than front] when the airplane is considered balanced.

In a other books about planes it is said that plane should balance in its flight position. So I would expect to see the Ultrastar fuselage tube to be horizontal when I hang it by the centerline of the 1" square tube.
Please comment if there is no mistake in the manual.

Did I understood the manual correctly and when the plane that is hanged will be in the position like in the picture below:
https://photos.app.goo.gl/rJ4Evyaz5GMyrBma9
Or should it be like that:
https://photos.app.goo.gl/tS7Ca1pU9DQ482Dt8


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worrybear(at)verizon.net
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PostPosted: Tue Jul 16, 2019 1:51 pm    Post subject: Kolb Ultrastar center and balance Reply with quote

When I built my Ultrastar I followed the directions in the manual. I had to
add about 12 lbs to the front to get the tube to its 10 degree angle. As I
flew the plane I removed 5 lbs, than the rest of the 12 lbs. It flew great
both ways. Dan

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Viktors.Zarskis



Joined: 16 Jul 2019
Posts: 3

PostPosted: Tue Jul 16, 2019 10:00 pm    Post subject: Re: Kolb Ultrastar center and balance Reply with quote

Thank you for fast reply!
I was worried that if i need to get the tail leveled in balance i had to add about 25 lbs in front..
At 10deg. angle it balances almost without ballast


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