Although all fuel in the two 6 gallon tanks is now pretty much on the CG, the extra 21 lbs. of fuel have decreased the rate of climb with a 220 lb. pilot (me) from about 300 fpm to maybe 50 to 100 fpm on an 85 to 90 degree day.
Something is seriously wrong here. My former 447 powered Airbike with big fat me (220 ish) and 5 gals of gas would climb at 750 fpm on a summer day. Propeller can make a huge difference.
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