At 05:26 PM 21/05/2012, you wrote:
On Mon, May 21, 2012 at 01:57:31PM +1000, Mike Borgelt wrote:
> Looks like our American friends may have built a fully competitive
> 15M sailplane
The Duckhawk? Yes.
With an aspect ratio of 30 and carbon pre preg construction and empty
weight of about 220Kg this a welcome development against the trend to
ever higher weights.
I have no idea what they are trying to do with the higher gross
weight versions with Vne of 200 knots +.
I hope they will do an 18M version by stretching the wing (same
chords and sections just further apart. Might have to lengthen the tail boom)
The 960 lb version will make a nice self launcher with a couple of BF
Turbine 30 Kg thrust jets. 58Kg/sq m so should be good at high speed.
Would be really interesting with a Ventus A type fuselage and T tail.
At 70 Kg it will likely stall at 50 knots straight and level. You are
going to be circling at 65 - 70 knots.
My jet project is still progressing. Tanks built and installed (BIG
job), plumbing in, battery boxes installed.
Engine installation next. New simplified retract method.
Mike
There's been some chat about it on the Waikerie Gliding Club mailing
list.
Vendor claims it does 50:1 at 71 knots at 960lb (55 knots at 600lb).
The Duckhawk VNX variant (same aircraft as the entry level, but with
thicker skins and more carbon in the spar) has a 225 kts VNE and is
stressed to +11/-9g.
Not a typo.
http://windward-performance.com/projects/duckhawk/specs/
- mark
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