At 11:46 PM 30/05/2010, you wrote:
pretty long take-off run; high density altitude?
PeterS
No different from a prop which also loses thrust at high density altitude.
An initial slow but constant acceleration doesn't actually increase
the length of the takeoff roll compared to a higher initial
accleration which decreases as you go faster. You are covering lots
of ground while going faster so that's where you want the higher
relative acceleration. For a 400Kg glider with TOP (75Kg initial
thrust) vs a 400 Kg glider with 68 Kg jets the thrust crossover is at
about 10 knots. With 56Kg thrust it is at around 21 knots.
Mike
Borgelt Instruments - manufacturers of quality soaring instruments since 1978
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