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Old Oct 18, 2004, 10:37 PM
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Ontario, Canada
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What Plane for a Graupner 700 BB Race Motor

I obtained a Graupner 700 BB Race Motor as part of a trade and I was wondering what sort of plane this motor would be suited for. I have several light electrics and I was hoping to build something in the 3-5 lb. range. Is this motor suitable for a heavy plane?
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Old Oct 19, 2004, 05:07 AM
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East Anglia, UK
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Yes. 700's in general will do about 300W. Not sure of best pack/gears/prop for this one, but 10 cells looks a good starting point from the KV, or 3s LIPO. Gear and prop for maybe 25-30A?

On higher voltages it may do better. Suggest maybe 16-18v would be good at around 20A or so.

Something like 9x6 on 2.3:1 on 10 cells. looks in the frame. Better on bit higher gearing

Loks nice on 5s LIPO and 3.6 box and maybe 10x7/9x6 prop.
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Old Oct 19, 2004, 05:13 AM
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I used to fly a 2,0 kg (4 1/2 lbs) 500 sq ins electric sailplane with a Speed 700 Turbo 9.6v on 11x1700 cells direct drive with a 9.5x5 prop. So you're right on the money with your weight estimate.

If I remember correctly, the Race turns faster per volt than the Turbo, so it's probably more suited to a gearbox. I think that Graupner still stocks a gearbox for the 700 series.
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Old Oct 19, 2004, 05:16 AM
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Thers a belt drive from graupner at the lest. and I think Tom Hunts belt drives also fit..yes - see http://www.modelairtech.com/belt.html

Nice beam mounting there as well.
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Old Oct 19, 2004, 07:21 AM
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Letchworth, Great Britain (UK)
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I recently got a Graupner 700 with gearbox (gears, not belt) from Gliders (UK). It powers my Flair Magnatilla (about 5.5 lbs) on 12 x GP3300 drawing about 35A max. on a 14x7 prop.
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Old Oct 20, 2004, 03:38 AM
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Quote:
Originally Posted by abenn
It powers my Flair Magnatilla (about 5.5 lbs) on 12 x GP3300 drawing about 35A max. on a 14x7 prop.
Yes, according to the published test results I have, 35A seems to be the appropriate current for operating a Speed 700.

I was always impressed by how smoothly this motor runs. However with the availabilty of outrunners with less than half the weight that can swing large props at the same power level, I've sadly relegated my Speed 700 to the spares box.
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Old Oct 20, 2004, 06:32 AM
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Letchworth, Great Britain (UK)
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All in good time, ChrisP! That was my first e-conversion, and I didn't want to splash out on an outrunner before I was convinced that e-power is the way to go. Now I am convinced, and I'm putting an outrunner into my second conversion.
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Old Oct 20, 2004, 07:33 AM
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Thanks for the suggestions!
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Old Oct 20, 2004, 07:48 AM
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East Anglia, UK
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Gimme a lerge ferrite lump and LIPOSagainst a more expensive brishless on nickels anyday.

ESPECIALLY for WWI short nosed types.
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Old Oct 20, 2004, 01:26 PM
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Dublin, Ireland
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You have a point there.
In a .25 size fighter where a Speed 600 with gears will do, but is a little slow, the direct drive Speed 700 really shines. Power is more readily available when you ask for it. And the fighter type model asks for that type of flying.
You can pull high amps and really move, 9 x 6 is middle ground, 9 x 8 sings.
Bad news is the amps .. duration with the lighter geared S600 is 50% extra over S700.
For rearward CG problems, that S700 really fixes things ....
Norman in Dublin
www.greenhobbymodel.com
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