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#11
March 17th 09, 10:00 AM
posted to rec.aviation.soaring
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Aerodynamics of Towing
Hi Mike, what are you towing.. A Horsa Glider?
75 pounds x (L/D) of 40 = 3000 Lbs I would think the tow rope 'Thrust' would be nearer 20-25 lbs. Even so, your sag only increases to 3 ft. Pilot Pete At 23:30 16 March 2009, Mike the Strike wrote: I ran a quick calculation of the expected catenary sag in a towrope. With a 200-foot nylon/poly towrope and 75 pounds of tension, the sag amounts to less than a foot, ignoring aerodynamic forces. Under steady towing conditions, it can probably be ignored. Mike 
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