---------------------------------------------------------- Kolb-List Digest Archive --- Total Messages Posted Tue 07/16/19: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 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 _____________________________________ Time: 12:02:20 PM PST US Subject: Kolb-List: Kolb Ultrastar center and balance From: "Viktors.Zarskis" 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 _____________________________________ Time: 02:51:50 PM PST US From: Subject: Re: Kolb-List: 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 _____________________________________ Time: 11:00:52 PM PST US Subject: Kolb-List: Re: Kolb Ultrastar center and balance From: "Viktors.Zarskis" 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message kolb-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Kolb-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/kolb-list Browse Digests http://www.matronics.com/digest/kolb-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.