Today's Message Index:
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1. 12:02 PM - Kolb Ultrastar center and balance (Viktors.Zarskis)
2. 02:51 PM - Re: Kolb Ultrastar center and balance ()
3. 11:00 PM - Re: Kolb Ultrastar center and balance (Viktors.Zarskis)
Message 1
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| Subject: | Kolb Ultrastar center and balance |
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
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=490336#490336
Attachments:
http://forums.matronics.com//files/image_590.png
http://forums.matronics.com//files/1563303317024_image_503.png
Message 2
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| Subject: | Re: Kolb Ultrastar center and balance |
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
-----Original Message-----
From: Viktors.Zarskis
Sent: Tuesday, July 16, 2019 3:02 PM
Subject: Kolb-List: Kolb Ultrastar center and balance
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
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=490336#490336
Attachments:
http://forums.matronics.com//files/image_590.png
http://forums.matronics.com//files/1563303317024_image_503.png
Message 3
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| Subject: | Re: Kolb Ultrastar center and balance |
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
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=490352#490352
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