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Old May 11, 2015, 11:34 AM
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Quote:
Originally Posted by JimNM View Post
8k is sufficient.
Thanks --eddie
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Old May 11, 2015, 12:16 PM
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14 (poles) * 1120 * 11.1 (V) / 20 (word of mouth constant) = 8702 Hz.

So better 8kHz.
Middle of the road between 8 and 16 is at about 1200kv and 4s, or higher RPM.
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Old May 11, 2015, 12:31 PM
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United States, MN, Lake Elmo
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Quote:
Originally Posted by renatoa View Post
14 (poles) * 1120 * 11.1 (V) / 20 (word of mouth constant) = 8702 Hz.

So better 8kHz.
Middle of the road between 8 and 16 is at about 1200kv and 4s, or higher RPM.
It runs so smooth I though maybe it wasn't reving.. its at 8khz .. good to know..
need good weather now.. Salangane 2.2 m maiden -- e
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Old May 18, 2015, 09:25 AM
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United States, MN, Lake Elmo
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1120 kv 820watt glider drive is perfect in this application. 12x10 prop, 3s 65c 1800 lipo, 70 amp esc.. Salangane 2.2m F3F .. (w zero additional weight setup arranged for proper CG) )

straight up vertical and disappears in about 20 second., turbo spinner and spoon cooling vent - motor didn't get over 120 degrees F on a 75 degree day - not continuous motor runs ) . - eddie

ps it's 65 oz full up.
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Last edited by fasteddie123; Today at 08:21 AM. Reason: ps.
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Old May 18, 2015, 09:30 AM
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WAA-08 THANK FRANK!
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Good to know it works for ya'. I have my motor on an 60 amp esc, 4s 2700 and a 14x8 prop. It hauls the Mystique RES to ALES heights as far down range as I like it in ~20 seconds. It is super nice to not have to worry about rotating can eating your motor leads.

I think these motors are a great value @ less than $40.00.
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Old May 18, 2015, 06:47 PM
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Quote:
Originally Posted by fasteddie123 View Post
1120 kv 820watt glider drive is perfect in this application. 12x10 prop, 3s 65c 1800 lipo, 70 amp esc.. Salangane 2.2m F3F .. (w zero additional weight setup arranged for proper CG) )

straight up vertical and disappears in about 20 second., turbo spinner and spoon cooling vent - motor didn't get over 120 degrees F on a 75 degree day - not continuous motor runs ) . - eddie
Good to know. I picked up the 840 kV version for an F5B Soitare that is waiting in the racks for me to build it out. They tell me these birds were typically fit out with 2KW motors on 27 cells so they were powerful but heavy. Go to these brushless and lipos and they can be so much lighter and powerful on half the watts.
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Old Jul 04, 2015, 11:14 AM
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Prop choice

I've read the thread and thanks to everyone who has contributed. I have two prop choice questions.

1) I'm building an eSupra 3.4M ALES plane and I plan to use the Gliderdrive 4.6 840kv in it. The plane will be about 65-67 oz AUW. For ALES flying, is there a suggested starting prop diameter/pitch? I have a watt meter but I don't have a stock of props at this range to test and so I'm looking for a good starting prop/battery choice for both a 3S and 4S system. I have a 60A YEP ESC.

2) I've built a custom full-house built-up wing 126" ALES plane that weighs about 62 oz AUW with the same motor and ESC. I used "Drive Calculator" software to select a prop but from what is written here, I may be under propping the motor and getting less power than is possible. The plane has not flown yet and I'm looking for a good starting prop/battery choice for both a 3S and 4S system for it as well. There's not a lot of room for battery. A nanotech 1300 3S fits and there's room for a 4S with similar length dimensions.

I know there will be multiple opinions but they will all be helpful.

Thanks to all in advance.

W
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Last edited by wingloada; Jul 04, 2015 at 11:20 AM.
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Old Jul 04, 2015, 11:53 AM
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14x8 works 3s and 4s for limited run with cooling.

Eflight stock prop for Mystique FTW!
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Old Jul 04, 2015, 02:30 PM
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+1 for 14x8 and 3s, is what I am using in my Graphite 3.1 1900 grams
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Old Jul 05, 2015, 01:14 PM
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Wingloda

with a 12x8 Aeronaut cam carbon prop and a 4-s 850 mAh 45-90 C nano battery on that set up you should get around 95 oz of thrust. That was the numbers I came up with for My setup and that puts me at a weight to power ratio of 1.32 to 1 for a 72 oz plane.

Clarence
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Old Jul 05, 2015, 02:37 PM
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Quote:
Originally Posted by wingloada View Post
I've read the thread and thanks to everyone who has contributed. I have two prop choice questions.

1) I'm building an eSupra 3.4M ALES plane and I plan to use the Gliderdrive 4.6 840kv in it. The plane will be about 65-67 oz AUW. For ALES flying, is there a suggested starting prop diameter/pitch? I have a watt meter but I don't have a stock of props at this range to test and so I'm looking for a good starting prop/battery choice for both a 3S and 4S system. I have a 60A YEP ESC.

2) I've built a custom full-house built-up wing 126" ALES plane that weighs about 62 oz AUW with the same motor and ESC. I used "Drive Calculator" software to select a prop but from what is written here, I may be under propping the motor and getting less power than is possible. The plane has not flown yet and I'm looking for a good starting prop/battery choice for both a 3S and 4S system for it as well. There's not a lot of room for battery. A nanotech 1300 3S fits and there's room for a 4S with similar length dimensions.

I know there will be multiple opinions but they will all be helpful.

Thanks to all in advance.

W
I have not read your entire build thread but I see you are making your own pod. That is good as most Supra fuselages could not take a motor this wide.
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