--- In Indoor_Construction_at_yahoogroups.com, "calgoddard" <calgoddard@...> wrote:
> Cezar Banks' LPP plan says the CG should be at 70%. How is that calculated? I know he recommending the center of gravity of the airplane (with the rubber motor mounted) should be a certain distance from some reference point that yields the specified percentage. What is the reference point? The wing has a five inch chord and he shows the CG at about three inches behind the leading edge. But that does not yield 70% in terms of a fraction.>>
Can't explain the discrepancy but 70% usually means 70% of the chord, going back from leading edge of wing. On LPPs it's convenient to drop a mark on motorstick vertically from CG line. If you can get adequate stability from more than 70%,(such as 75%) give it a try. Let the stopwatch judge.
MB
Received on Fri May 27 2011 - 12:38:09 CEST
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:46 CET