byoungplumbing(at)gmail.c
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 Posted: Thu Nov 08, 2012 11:36 pm Post subject: cg mkiii |
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guess it depends on the weight of the pilot.... mine worked out about –4 inches..... kolb’s belly button method worked within 1/4 inch of what I calculated, I did the cg with the plane empty, then did it with me in it, and did the math to find the cg of me...then measured from the leading edge to the belly button... and the measurment and calculations were really close. as for the cg of the fuel tanks..... I have the 16 gal alum tank offered by the original kolb company. the cg of that tank is 21 to 21 1/2 inches I would have to go out to the plane and look at the w&b sheets , which worked out to be very near the rear cg limit of 35% so with me solo. I start at the rear cg and as I burn off fuel the cg does not move... if I have a passenger I am at a point forward of the rear limit. and as I burn off fuel, the cg moves forward. if you have the 2 plastic tanks, I don’t know where you will come in,, but my best guess is it will be somewhat close,,,,, weigh the plane and do the math. it is probably something you wont want to guess with or use someone else’s numbers. I put together a spread sheet to do the math... but you still have to get accurate weights and measurements for the spread sheet to work for you. when making the measurements, make sure the plane is in the correct attitude. or you just did a lot of work for nothing. my blue prints show the cg range from 25 to 35 percent of the wing cord.
boyd
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Can anyone tell me what the moment arms for the pilot(s) and for the
fuel in a Mark III Classic are? I'm considering buying one and wanted
to run some numbers. What is the allowable CG range? Max gross?
Thanx muchly!
Gerry Visel
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