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Old Mar 19, 2014, 02:16 PM
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Scale glider self launch systems

I have to make a choice for a SLS for my ASW 22, 4m wingspan, which would weigh in around 5kg. I would like to know from the groups experience which systems works best. I have found a few which would do the job:
- the PowerLifter from LF-technik
- the Power Pod launching system from Espritmodel
VS
- a nose job with a motor in the nose like the Xpower brussless motor with longer shaft or the hacker A40 glider conversion kit.

Experiences would be appreciated.

Cheers
Gert
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Old Mar 20, 2014, 04:50 PM
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Most simple and cheap: A Nose Job. You can hand launch and if you paint the blades white, they'll disappear visually in an instant. Also is the lightest SLS approach.

The other approaches all have their pluses and minuses. In addition to multiple nose jobs, I've tried a power pod from one of the German suppliers...similar in concept to Esprit's. It does raise and shift the CG. I've had limited flight time with it but not overwhelmed so far.

I've seen the LF system in action at an outdoor trade show in a 4 meter sailplane. Very impressive performance. Costs as much as a tow plane which is typical of most SLS units.

Anyway, something to chew over.

Steve
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Old Mar 24, 2014, 04:50 PM
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I went with the the nose motor for Cheaper Price, High Performace, & Lighter Package.
Here;
http://www.rcgroups.com/forums/showthread.php?t=2116760
Pauly
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Old Mar 24, 2014, 04:56 PM
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Smart move for all the reasons you noted above!

Steve
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Old Mar 24, 2014, 04:59 PM
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One suggestion: position the motor and folding props so the blades look naturally in line with the fuse when folded. No matter what you do, you'll want to add a little elevator compensation with the motor on. Usually it's a bit of down elevator.

Steve
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Old Mar 24, 2014, 05:07 PM
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I went with 3 degress down & 2 degrees right trust.
But thats with over 2000 watts.
Pauly
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Old Mar 25, 2014, 11:42 AM
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Pauly
The higher performance and lighter package will probably convince me for the nose job. Thanks for the feedback
Cheers
Gert
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Old Mar 26, 2014, 05:20 AM
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I've built a couple of scale sailplanes with a nose mounted, extended shaft motor. First one was an ASH26 3 meter all glass with an X-Power motor, the second was a 1/4 scale Fox with a 1700w motor with a shaft extension. Both fly extremely well with only a marginal weight gain as the motor replaces the lead needed in the nose to balance.
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Old Mar 26, 2014, 12:37 PM
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Quote:
Originally Posted by simonslim View Post
I've built a couple of scale sailplanes with a nose mounted, extended shaft motor. First one was an ASH26 3 meter all glass with an X-Power motor, the second was a 1/4 scale Fox with a 1700w motor with a shaft extension. Both fly extremely well with only a marginal weight gain as the motor replaces the lead needed in the nose to balance.
Very Nice....
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Old Mar 26, 2014, 02:16 PM
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Great stuff!
Are the shaft extensions available commercially?
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Old Mar 30, 2014, 11:24 PM
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Quote:
Originally Posted by union1 View Post
Great stuff!
Are the shaft extensions available commercially?
Scroll down a bit;
http://www.espritmodel.com/new-2014-season.aspx
Pauly
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