Michael Adams 3 Posted April 21, 2017 Share Posted April 21, 2017 HI, can any one please help me to find the Cof G for an old biplane I am converting from diesel to electric, the top wing is 48" X 8" , the fuse length is 35". I have no drawing to help. plus no name for it to help. Would it be 3. 3/4" from the leading edge. the electric motor will be lighter than the engine, so I will have to add weight to balance it. Any info will be most appreciated Thanks in advance Mike. Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted April 21, 2017 Share Posted April 21, 2017 Look down onto the two wings on plan view Michael, and you will see a much bigger combined chord than just the top wing. Measure this combined chord and divide by 3 This is your one third chord measurement to apply from the leading edge For a ball park, close enough for starters, C of G Quote Link to comment Share on other sites More sharing options...
Michael Adams 3 Posted April 21, 2017 Author Share Posted April 21, 2017 Hi Denis, thanks for the info as soon as I can fit the wings I will do as you suggest, I am still in the proses of rebuilding the front end around the motor, I am replacing an ENYA 15-IV. with an out runner GT2815--07, a 9X6 prop this is the one that was on the original engine, the plane was a gift and soaked in fuel so had to replace right back past the tank bay, still keep me busy for a while. I hope this is not going to be too powerful. Thanks again & will let you know how it goes. Mike. Quote Link to comment Share on other sites More sharing options...
PatMc Posted April 21, 2017 Share Posted April 21, 2017 Michael, if you can post a photo of the model someone may be able to identify it & help with a copy of the plan. Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted April 22, 2017 Share Posted April 22, 2017 The forum posts on the Skywriter are a similar size to your model Michael Lindsay Todd's 48” sport scale bipe will lend fluency and extra flourish to your flying. Datafile Name: Skywriter Model type: Sport-scale biplane Designed by: Lindsay Todd Wingspan: 48” Fuselage length: 39.5” Wing area: 803 sq. in. All-up weight: 5 lb 4oz Wing loading: 16oz / sq. ft. Functions (servos): Aileron (2); rudder (1); elevator (1); throttle (via ESC) Power system: Turnigy 3548 1100Kv motor; 60A ESC; 3s 5000mAh Li-Po Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted April 22, 2017 Share Posted April 22, 2017 The way that I do it is to take the 1/4 chord point (30%) if you like that CG position) on the top wing and the bottom wing and put the CG half way between the t wo. Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted April 22, 2017 Share Posted April 22, 2017 That is a better way Peter, and nearer the mark too We live and learn thanks Quote Link to comment Share on other sites More sharing options...
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