At 08:52 AM 26/03/2007, you wrote:
Hi all,
Let me rephrase the question, what is the conversion for thrust to
horsepower assuming 0 airspeed, idea being what acceleration a jet powered
glider will have from a standing start, ie takeoff?
Regards
Dave
Acceleration is force/mass
The acceleration is the net after aero drag and rolling friction are
subtracted. Rolling friction varies with surface.
Aero drag varies with airspeed, as does the engine thrust which even
for a jet drops off with increasing airspeed.
An analytic solution gets nasty but fortunately you can do a numeric
solution and piecewise integrate or there is a simplification
possible to give a reasonably good solution very easily.
Short answer is there's no easy answer!
Upper bound is static jet thrust/mass of glider.
Just use MKS units for calculations. It is a lot less confusing. You
can convert to knots etc at the end.
Mike
Borgelt Instruments - manufacturers of quality soaring instruments
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