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Old Jan 11, 2007, 02:48 PM
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Pirkkala, Finland
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Looking for a cheap 500-600 size brushless

I'm looking for a motor that'll spin 9x6 prop direct drive with 4s LiPo at 40amps.
Any suggestions? So far I've found one: Dymond W35 E1 which seems to be some kind of AXI 2826 copy. http://modellhobby-shop.de/e-vendo/e...p=k_staufenb_e
I'm guessing that it might do fine but I'm still looking for other options.
From outside of EU, the price shouldn't be over 50USD, because of the customs. Inside EU, it isn't that important. Any way, suggestions please!

By the way, I remember that I've read about a cheap inrunner bought from Ebay, but can't find the thread. All I remember of the motor itself is that it's black and is about the size I'm looking for. If anyone finds it, I'd appreciate a link.
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Old Jan 11, 2007, 03:34 PM
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Chattanooga, Tennessee, United States
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This Dualsky might just do what you want - it's rated at 650W, but if you want 40A on 4s continuous you probably need a 750-900W rated motor: http://2dogrc.com/ecommerce/os/catal...oducts_id=2071
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Old Jan 11, 2007, 04:01 PM
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Tel Aviv-Yafo Sde Dov, Israel
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try www.orionhobby.net

great online place in Finland for exactly the type of equipment you're looking for.
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Old Jan 11, 2007, 06:43 PM
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This one might do the trick on 4s? http://www.orionhobby.net/index.php?productID=419
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Old Jan 12, 2007, 01:53 AM
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England
Joined Jul 2004
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Quote:
Originally Posted by Jupeli
By the way, I remember that I've read about a cheap inrunner bought from Ebay, but can't find the thread. All I remember of the motor itself is that it's black and is about the size I'm looking for. If anyone finds it, I'd appreciate a link.
Possibly this one?

Quannum 36-55



A little info in this thread> http://www.rcgroups.com/forums/showthread.php?t=564118
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Old Jan 12, 2007, 08:41 AM
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Exactly that one, thanks for the link
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Old Jan 12, 2007, 08:55 AM
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United States, MI, Holland
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I have the 40-70 version of that motor. I think Dymond sells them under another name but they appear to be the same motor.

I picked mine up on ebay for about $50 but it is larger than what you are looking for. The 36-55 would be great I bet.
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Old Jan 12, 2007, 09:00 AM
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Pirkkala, Finland
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Quote:
Originally Posted by mt_100
I have the 40-70 version of that motor. I think Dymond sells them under another name but they appear to be the same motor.

I picked mine up on ebay for about $50 but it is larger than what you are looking for. The 36-55 would be great I bet.
Yea, I think so too and the price is good. I guess that 9x6 would be too much with 4s, but well.. I'm thinking of a speedy plane so 8-inch props won't be too bad. I think that if I end up buying that, I'll start with something like 8x5, 8x4.
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Old Jan 12, 2007, 09:03 AM
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Not as cheap as mentioned, but some excellent spd 500-600 replacements are himax 3510 series and 3516 series outrunners. These are very powerful, have the same front bolt pattern as spd 500, and about the same diameter. They are a drop in replacement in most applications. Repare parts can be had at any hobby retailer that carrys himax.
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Old Jan 13, 2007, 12:57 AM
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Joined May 2004
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Quote:
Originally Posted by Jupeli
Yea, I think so too and the price is good. I guess that 9x6 would be too much with 4s, but well.. I'm thinking of a speedy plane so 8-inch props won't be too bad. I think that if I end up buying that, I'll start with something like 8x5, 8x4.
Jupeli,
I bought one of those Quannum 36-55's recently but have not had chance to do any real testing as yet. I'll try and fit a 9x6 to it over the weekend and see what it pulls on a 4S pack.

Fish.
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Old Jan 13, 2007, 04:40 AM
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Melbourne Beach, Florida
Joined Jan 2002
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Here is the motor for $33. Shipping is reasonable too. I've made 16 purchases from UH and have been quite pleased overall. I placed the latest last night.

https://www.unitedhobbies.com/UNITED...idProduct=2044

Len
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Old Jan 13, 2007, 02:02 PM
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Pirkkala, Finland
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I now ordered the Quannum 36-55. Fish, I'd appreciate the data as I don't have a watt-meter myself yet. It's the next thing on my list, though...
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Old Jan 14, 2007, 03:55 AM
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J.,
Yup no problem; I'll do a few simple/quick tests with a range of 8-10" props, whatever I have available.

I also bought the Feigao Power Analyser - ~US$40 - from U.H. when I got the motor.... again only tried it briefly so far (my garage is so da*n cold at the moment! ) and it works but I'm not convinced of it's ultimate accuracy. Probably good enough so as not to fry the motor/esc/lipos

I'll be back later,
Fish
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Old Jan 14, 2007, 07:47 AM
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J. et al,
O.k. first part of my testing...

Measured my pillar-drill (drill-press) RPM by putting a prop - via adaptor - in the chuck and tach'ing it. Result = 2400RPM.

Then stuck the Quannum 36-55 in the chuck and measured the AC voltage from each winding with my Fluke DVM. Measured 1.29V, 1.29V & 1.27V so call that an average of 1.28V AC.

Using this formula -> kv formula I calculated that my motor has a kv of 1395 approx. Manufacturer specs 1350kv.

Next to prop the motor...
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Old Jan 14, 2007, 08:22 AM
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Motor: Quannum 36-55.
Prop: 9"x6" APC-E.
Batts: 4S2P 2200mAh 10-12C cont/16C burst, i.e. ~48Acont & 70A burst.
ESC: HobbyWing Guard 60A.
Meter: Feigao Power Analyser.
Tach: Glowbee Intellitach & 2xAA Maglite light-source.

Firstly, the 9x6 is too much prop I think for WOT. So I just increased the throttle until I hit approx 40A and got the following:-

38.5A
12.5V
12000RPM

All measurements made after 15-20 secs of running and are approximate cos it all happens at once

After a couple of runs to double check, the ESC & batts were just warm but the motor was quite warm (as hot as I'd like to run in a model) but note that I forgot to drill cooling holes in the plywood mount so no through-airflow!

This thrust calc Thrust Calc suggests 61oz/1730g of thrust at my altitude of 300'.

HTH,
Fish.
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