---------------------------------------------------------- Kolb-List Digest Archive --- Total Messages Posted Sun 08/25/19: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 09:59 AM - Re: FireFly Weight and Balance (Eugene Zimmerman) 2. 10:57 AM - Re: Re: FireFly Weight and Balance (John Hauck) ________________________________ Message 1 _____________________________________ Time: 09:59:37 AM PST US Subject: Kolb-List: Re: FireFly Weight and Balance From: "Eugene Zimmerman" Concern about CG limits on any Kolb aircraft is for all practical purposes unnecessary unless there is a significant deviation from, or modification of, the airframe from the original Kolb design plans. The best way to optimize the CG on any Kolb airplane is to test fly the airplane and trim the control surfaces to fly hands off straight and level. Modifying a Kolb aircraft's CG is beneficial only for the purposes of minimizing significant control surface deflection necessary for neutral-hands off straight and level flight. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=491047#491047 ________________________________ Message 2 _____________________________________ Time: 10:57:34 AM PST US From: John Hauck Subject: RE: Kolb-List: Re: FireFly Weight and Balance I agree with Gene Zimmerman. I've built 3 Kolbs, US, FS, and MKIII. Never did a weight and balance on the US and FS. Test flew it, added a trim tab to aileron, elevator, and rudder. Trimmed and test flew for best cruise flight. My MKIII has aft CG on paper. Flies neutral with no pitch trim at glide, idle rpm. Bring up the power and it takes a lot of nose up pitch trim to fly neutral. That doesn't sound like aft cg. Pushers with high thrust line like the FS and MKIII have significant pitch change from idle to cruise power or full power. Lots of Kolbers don't recognize this, thinking something is wrong with their airplanes. Build it according to plans and it will be within cg limits. I have made significant modifications to all my Kolbs and never experienced a cg problem, never had to add 40 lbs of lead to the nose cone, etc. john h mkIII Titus, Alabama -----Original Message----- From: owner-kolb-list-server@matronics.com [mailto:owner-kolb-list-server@matronics.com] On Behalf Of Eugene Zimmerman Sent: Sunday, August 25, 2019 11:59 AM Subject: Kolb-List: Re: FireFly Weight and Balance Concern about CG limits on any Kolb aircraft is for all practical purposes unnecessary unless there is a significant deviation from, or modification of, the airframe from the original Kolb design plans. The best way to optimize the CG on any Kolb airplane is to test fly the airplane and trim the control surfaces to fly hands off straight and level. Modifying a Kolb aircraft's CG is beneficial only for the purposes of minimizing significant control surface deflection necessary for neutral-hands off straight and level flight. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=491047#491047 ------------------------------------------------------------------------------------- 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.