the three blade Warp-Drive blades are an excellent compromise between
efficiency / ground clearance / weight / noise and vibration level. With
those blades mounted on the NSI variable pitch hub (variable between 12 to
22 measured on the blade tips) we achieve a max cruise at 5500 rpm of 140kts
TAS and regularaly cruise at 125-130kts with 5.200 and 16 l/h. Climb at max
T/O weight and ISA is a honest 890 ft/min. (Mk1, Rotax 912, 400 hours flown)
Klaus
Nigel Charles wrote:
> Message text written by "Shaun Simpkins"
> >With a 63" Whirlwind, ground clearance is 3.75" (!).<
>
> As there have been a significant number of prop strikes over the years it
> might be worth choosing ground clearance over efficiency.
>
> Nigel Charles
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