Matthew,
Further to the last post:
With the electric motor there are no reduction belt power losses as
it is direct drive so not directly comparable to a piston engine.
I'm not entirely convinced about the front power concept. It will
cause a loss of glide performance by destroying the laminar flow over
the fuselage front. The story about the R/C glider may have more to
do with the model not having enough up elevator to trim it at climb
speed with a high thrust line and moving the motor to the nose fixed
that. While the motor is running there is lots of high velocity air
flowing over the fuselage causing more drag.
In any case while a get you home engine is a good idea it doesn't
solve the launch problem. 10% of the utility for 90% of the complexity.
Todd,
How much battery on the powered chute?
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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