Prop selection? - RC Groups
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Aug 03, 2001, 03:17 PM
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Prop selection?

I have an Aveox 1010/df I want to run in a bat electric hotliner. I was going to run it on 6 cells and a 7.5x4 prop and a ds 40 esc. My problem comes with wanting to run 8 Cp1300 cells. I did not realize that the amp draw would go up to 59 amps. I need to figure out what prop to use? I want to find the right prop to get the amps down. this is my first brushless set and do not want to flame it out on the last run. I will be using this LMR. Should I hold off till I get a gearbox. If anyone can help I would appreaciate it.
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Aug 03, 2001, 04:02 PM
Balsa Kamikaze
Jensst's Avatar
Since you have the DF version of the motor the Kv is horribly high for direct drive. Run it on fewer cells (like 6) or get a gearbox (do people use gearboxes in hotliners?! )


[This message has been edited by Jensst (edited 08-03-2001).]
Aug 03, 2001, 04:17 PM
Registered User
What current would it draw on a 4.7x4.7? That should be a similar load to a small ducted fan.

I've run both the CAM and APC versions of this prop at well over 30K rpm without problems.
Aug 04, 2001, 07:54 AM
Registered User
From the best numbers I get are from a 5x5 and a 6x6 at 26 and 35 amps. But there is not a lot of thrust with those props, i think it was 16 oz and 21 oz at a pich speed of 112 and I think 130. I could go geared but I am limited on prop size, 11" is the biggest I can go. This plane should be pretty light around 30 oz. I was going to go direct for speed. Because this plane is so light, i figured it wont go that fast in a dive. I was going to post in sailplanes, but figured you guys would know the most about direct drive. Most of us get around the site alot though! I may wait for a gear drive now.
but I am still undecided. The 6x6 would be fast but hard to launch? The plane is a Honey (bat)electric. Any help would be great.-----Mike
Aug 04, 2001, 08:00 AM
Registered User
I dont think the 4.7x4.7 is enough prop. It would only draw like 21 amps. I need to be at 26 -35 maybe 40 amps? can you hurt a brushless motor by under proping it?---Mike
Aug 04, 2001, 09:58 PM
Registered User
ScotY's Avatar
Certainly no expert here, but I really think you need to gear that motor to get any kind of decent perfomance out of that plane. MPI sells some nice gearboxes ($70 at Specialized Model Supply) and they offer several gear ratios...that ought to make it workable with your prop size limitation. Have you measured from wing LE to nose? On one of my planes, I've only got 5" and have easily fit a 12" prop...this because the spinner spaces the blades out a bit from the nose and the yoke length is factored into the total prop diameter.

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