Thursday, May 29, 2008
Aspen2 Glide ratio - checkin' the numbers
I launched from Mystic a little after 5:30pm today - the idea was to do a sleddie in really calm conditions and get a more accurate idea of my glide ratio. Over a 2.1km straight glide I got a glide ratio of 8.13:1 (slightly less than the overall sleddie ratio of 8.27:1) and a sink rate of 1.1 m/s (1.05 overall). I think the slightly better overall figures are a result of initially flying along the Marcus spur before turning to overfly the landing paddock for the 2km leg. Not quite the 8.7 as reported by the Gleitschirm magazine - or the more conservative 8.5+ on the Gradient website - but where they'd use really aerodynamic harnesses, speed arm, optimum flying weight, etc, etc I'm right on the top of the weight range, flying a harness with lots of back protection and stuffed with various odds and ends, and the wing has over 70hrs of Aussie sun on it... It's probably really not that bad. Anyway, it's a kickin' wing to fly and now I have a bit more of an idea of what a still air glide is. Dunno how useful that is really - I usually use a 5:1 glide when planning flights over tiger country and have had some long 12:1 glides on lifty lines... But any excuse to fly!!
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