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Achim:
* * *If I am not mistaken you divide the lift by the drag, this is the performance ratio. *For example the last parachute I designed had an L/D of 5.12:1 which in parachutes is not too shabby. *High performance soaring gliders have an L/D of 50 :1 or better. I think an L/D ratio 13:1 would be a stretch for WW1 aircraft. I would think the L/D ratio would be in the range 6-8 :1. The drag factor on most WW1 aircraft was quite high.
* * * * * * * * * * * * * * Blue skies,
* * * * * * * * * * * * * * * Dan-San
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