>The powered paraglider lasted about 40 minutes. Heaps of power though so most >of the >time not much throttle had to be used to hold height. I am not sure >how long it would last >at full throttle. It used the 30A battery listed on >their site.
I think that several of the ultralight sailplanes with electric self launch capability advertise something like 3 climbs to 2000' on a charge. Having only one 20 KW motor is in some ways neither here nor there since you can either arrange several radially around a big gear ring or connect one up the back of the other. There's a piece in Keep Soaring on a Plettenberg motor http://www.keepitsoaring.com/LKSC/Downloads/Keep_Soaring/July_August_2010.pdf which claims 15KW, 1.9 kgs and US$ 850. The problem is almost certainly not the motor, more the speed comptroller and the batteries. Mostly the batteries. D On 27/07/2010, Todd Sandercock <[email protected]> wrote: > The powered paraglider lasted about 40 minutes. Heaps of power though so > most of > the time not much throttle had to be used to hold height. I am not sure how > long > it would last at full throttle. It used the 30A battery listed on their > site. > > Todd > > > > ________________________________ > From: Mike Borgelt <[email protected]> > To: Discussion of issues relating to Soaring in Australia. > <[email protected]> > Sent: Tue, 27 July, 2010 11:34:46 AM > Subject: Re: [Aus-soaring] electric glider > > 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 >>_______________________________________________ >>Aus-soaring mailing list >><mailto:[email protected]>[email protected] >>To check or change subscription details, visit: >><http://lists.internode.on.net/mailman/listinfo/aus-soaring>http://lists.internode.on.net/mailman/listinfo/aus-soaring >> >> >> >>_______________________________________________ >>Aus-soaring mailing list >>[email protected] >>To check or change subscription details, visit: >>http://lists.internode.on.net/mailman/listinfo/aus-soaring > > 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 > > _______________________________________________ > Aus-soaring mailing list > [email protected] > To check or change subscription details, visit: > http://lists.internode.on.net/mailman/listinfo/aus-soaring > > > > _______________________________________________ Aus-soaring mailing list [email protected] To check or change subscription details, visit: http://lists.internode.on.net/mailman/listinfo/aus-soaring
