Slope & Dynamic Soaring
Talk about slope models and dynamic soaring (F3F in the forum below).
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By oipigface · Posted
Ah well, there’s nothing new under the sun! On p82 of Sailplanes 1920-45 Martin Simons writes of the Darmstadt D-28 Windspiel: ‘The rudder was of an ingenious double action type. The front portion of the vertical tail was not a fixed fin but moved as a rudder. To it was hinged the rear portion, geared in such a way that it moved twice as much as the front segment.’ That was in 1933, when students at Darmstadt Technical University tried to build as efficient a sailplane as they knew how. The plane held the world distance record for a short time, but was wrecked when a powered plane landed on it at Griesheim aerodrome. It was replaced by the slightly heavier D-28b, which was also a good performer. Both planes were very pretty. It is not clear from Simons’ description whether the two parts moved in concert or in opposition, although I think that the description of the gearing suggests the latter. It looks to me as if your elevator does the former. My grasp of formal aerodynamics is insufficient to analyse the issues here properly, but my intuition (always a bad guide!) tells me that an oppositional setup would induce less drag all other things being equal. Does anyone know? -
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