Matthew,
The Fischer TOP is 18KW for self launch and works fine. A little
extra power plus the ability to use a larger prop for higher
propeller efficiency (use the 2000rpm motor, not the 2400rpm motor)
should mean the 20KW is OK at least up to around 400Kg gross.
Optimum might be 30KW for a single seater but they don't make one (yet).
The front guys have a quite small propeller which means the prop
efficiency isn't all that good. It is power delivered to the glider
that counts. For low speeds the larger the prop diameter the better.
Just got an automated reply about price. Everyone is at Oshkosh of
course as it starts today.
Mike
At 09:18 AM 27/07/2010, you wrote:
Front mounting electric motors seem to be increasingly feasible,
some companies are already selling them.
<http://www.front-electric-sustainer.com/>http://www.front-electric-sustainer.com/
Their motor goes up to 25kW for use only as a sustainer (1.6m/s), so
perhaps a more powerful motor is needed for self launching...
~Matthew Scutter~
On Tue, Jul 27, 2010 at 8:27 AM, Mike Borgelt
<<mailto:[email protected]>[email protected]>
wrote:
Anybody want to do an electric self launcher?
<http://yuneeccouk.site.securepod.com/PowerMotor_Tech_spec.html>http://yuneeccouk.site.securepod.com/PowerMotor_Tech_spec.html
Off the shelf motor, controller and battery tech.
A 20 Kw motor with controller and 4Kw-hour battery pack along with
suitable prop should be around 37 Kg mass.
Say under 40Kg installed.
I'm enquiring about price. Will report.
Mike
Borgelt Instruments - manufacturers of quality soaring instruments since 1978
phone Int'l + 61 746 355784
fax Int'l + 61 746 358796
cellphone Int'l + 61 428 355784
email:
<mailto:[email protected]>[email protected]
website: <http://www.borgeltinstruments.com>www.borgeltinstruments.com
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Borgelt Instruments - manufacturers of quality soaring instruments since 1978
phone Int'l + 61 746 355784
fax Int'l + 61 746 358796
cellphone Int'l + 61 428 355784
email: [email protected]
website: www.borgeltinstruments.com
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