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We timed the J3 climb rate every 500 feet up to 5000 feet above ground level today. Surface temperature was 92 degrees and surface pressure was 30.04" Hg. Performance was nothing to write home about, but I'll report it anyway. Plane had an average of about 5 gallons of gas on board. Pilot weight was about 165 pounds. Density alttude at the surface was 2350 feet. Didn't have a thermometer on board, so are assuming DA at the top of the 5000' climb was about 7350 feet.
Maximum rate of climb was 1075 fpm between 500 and 1000 feet above ground. Climb speed was about 55 mph (reducing climb speed to 50 mph on another run knocked about 37 fpm off the maximum rate of climb, and about 100 fpm off the climb rate at 7350 DA). DA at max ROC was about 3350 feet. Rate of climb at 5000' HAG (7350' DA) was 790 fpm. Other numbers showed the usual amount of scatter expected during data gathering, but generally fit the trend. Warm weather sucks.
JimC
Maximum rate of climb was 1075 fpm between 500 and 1000 feet above ground. Climb speed was about 55 mph (reducing climb speed to 50 mph on another run knocked about 37 fpm off the maximum rate of climb, and about 100 fpm off the climb rate at 7350 DA). DA at max ROC was about 3350 feet. Rate of climb at 5000' HAG (7350' DA) was 790 fpm. Other numbers showed the usual amount of scatter expected during data gathering, but generally fit the trend. Warm weather sucks.
JimC
