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Old Oct 04, 2012, 03:55 PM
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whay so big a prop on this setup?

In another forum I read of a person who did a power setup in a 8lb sailplane with a
G60 motor (65A/500kv) with a 2200mah 5S 65C/130C, 60a esc, and a 18x6 prop. He said it was a great setup.
(This is a setup for big floater sailplanes to replace the use of a winch)

Anyway, I checked that configuration using the calculator at http://www.ecalc.ch/motorcalc_e.htm and it states that the motor is way over propped.
(Iím new to electrics.)

I asked at the other forum but it is an old thread and I have not received an answer.

How can you run a prop as big as a 18x6? What am I missing here.
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Old Oct 04, 2012, 08:08 PM
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The motor he said he used was a Power Up 60 Kv=500, pulling 52A, although I gather from the thread he usually used about half throttle - only got 4 flights.

From the video that was clearly enough power, presumably around 900W peak, assuming a 2200 pack would sag to around 3.5v/cell @ 50A

I can't find that motor anywhere, but if you use an 18.5x10 on a Turnigy G60-400 with 5S you'd expect about 880W, but better IMO would be the G60-300 on 6S for better efficiency, 45A peak and just over 900W.
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Old Oct 04, 2012, 10:01 PM
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An 18x6 is NOT too big of a prop for a 60 size electric motor.

Most motors in this size range can easily swing a 16x10 and thats on 6s.

That setup listed by the OP is using only a 5s. Relative to the 16x10, that 18x6 is dropping FOUR on the pitch, but only increasing diameter by two. An 18x6 will pull LESS amps then a 16x10.

Further, the plane in question is a sailplane. Power is only needed in burst amounts, not consistently...so a small 2200 battery is just fine
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Old Oct 05, 2012, 09:17 AM
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Thanks guys.
I am building a sailaire for video work and need to electrify it. Im a long time gas and glo flyer so this is my first adventure into electrics (other than a couple micro bnf's).
I'm presently looking at a HK Turnigy G60 300kv. HK has that G60 in 300,400, & 500 kv. Per the threads above I will go with a 6S.
I am having trouble finding the proper folding blades and spinner for that 6mm shaft. Any ideas?
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Old Oct 05, 2012, 03:46 PM
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Quote:
Originally Posted by ronj10 View Post
Thanks guys.
I am building a sailaire for video work and need to electrify it. Im a long time gas and glo flyer so this is my first adventure into electrics (other than a couple micro bnf's).
I'm presently looking at a HK Turnigy G60 300kv. HK has that G60 in 300,400, & 500 kv. Per the threads above I will go with a 6S.
I am having trouble finding the proper folding blades and spinner for that 6mm shaft. Any ideas?
Esprit among others carries a wide range of folding prop bits. The collets come in various sizes: http://www.espritmodel.com/aeronaut-...ropellers.aspx
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