help with brushless motor

dr66 · 05-02-2010, 07:07 PM

i have a 430L BL motor 3550 KV it came with my trex sa. i was wondering if i could usse it in an airplane. if i can what size prop ? the esc is a 35a BL thanks

aerocal · 05-06-2010, 01:02 AM

For practical purposes and in general Id have to say NO.You can roughly figure a 3550kv motor on 12volt is going to turn 40,000rpm and then some.Even with a good load on it I think 30,000 easily.I think I saw a thread somewhere of someone doing it but you would need a tiny prop like 3x3 or something like that.Like a ducted fan without the duct.
Thats my thinking on it.Maybe someone else has another idea.

Skiddz · 05-07-2010, 12:09 AM

Gear it and turn a big prop.... Kv is definitely too high to use that motor in a propped airplane unless it's geared and run on 2 cells. Ducted Fan use might be ok tho..

TomRex · 07-02-2010, 06:21 PM

Quote:

Originally Posted by dr66

i have a 430L BL motor 3550 KV it came with my trex sa. i was wondering if i could usse it in an airplane. if i can what size prop ? the esc is a 35a BL thanks

A couple guys have good success with an APC 4.1x4.1 on a wing.

Kington99 · 07-03-2010, 01:41 PM

maybe as a pusher with a 4" prop, anything else ain't going to cut it. Motors are so cheap these days just get something more appropriate, I'm currently swapping my blown 2900kv motor plus 3:1 gearbox for a 1000kv unit for about £12

05-02-2010, 07:07 PM	#1
dr66 Registered Users My HF Map location Join Date: Nov 2009 Location: Leominster, Ma	help with brushless motor i have a 430L BL motor 3550 KV it came with my trex sa. i was wondering if i could usse it in an airplane. if i can what size prop ? the esc is a 35a BL thanks

05-06-2010, 01:02 AM	#2
aerocal Registered Users Join Date: Jun 2008 Location: Central California	For practical purposes and in general Id have to say NO.You can roughly figure a 3550kv motor on 12volt is going to turn 40,000rpm and then some.Even with a good load on it I think 30,000 easily.I think I saw a thread somewhere of someone doing it but you would need a tiny prop like 3x3 or something like that.Like a ducted fan without the duct. Thats my thinking on it.Maybe someone else has another idea. __________________ Too many helis & Too many planks Lots of DX radios & A couple Futaba radios AMA member & Full scale plank driver HELIFREAK !!! To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

05-07-2010, 12:09 AM	#3
Skiddz HF Support My HF Map location Join Date: May 2006 Location: Carlsbad, CA (USA)	Gear it and turn a big prop.... Kv is definitely too high to use that motor in a propped airplane unless it's geared and run on 2 cells. Ducted Fan use might be ok tho.. __________________ -Kevin No helicopters were harmed in the creation of this post. AMA CD # 7309, Turbine Waiver# RW 890 To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

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07-03-2010, 01:41 PM	#5
Kington99 Registered Users Join Date: Jun 2009 Location: Warwick, UK	maybe as a pusher with a 4" prop, anything else ain't going to cut it. Motors are so cheap these days just get something more appropriate, I'm currently swapping my blown 2900kv motor plus 3:1 gearbox for a 1000kv unit for about £12