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#29
November 15th 13, 04:02 PM
posted to rec.aviation.soaring
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Aerotow ropes: short or long, breakable or unbreakable?
On Friday, November 15, 2013 7:41:22 AM UTC-6, James Metcalfe wrote:
At 12:39 15 November 2013, GM wrote: ... The angle of attack of the glider during a winch launch is no different than if the glider was in free flight at the same speed! Actually, it is significantly different: the wing has to deal with the tension in the cable (including the cable self-weight) as well as supporting the weight of the glider. This could easily double the AoA required in steady flight & smoth conditions towards the end of a winch launch. Well, James, now you have gone and confused AoA with lift coefficient. You do not necessarily double AOA to double lift coefficient. Lift coefficient generally goes up about. 1 per degree of AoA while you are below separation of flow on the wing surface. At some point on the curve, doubling AoA doubles Cl, but only at that one point. And I would guess that point is no where near where you operate on a winch launch. Steve 
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