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View Full Version : KMS KBM31/09 Bl motor turn a 12x8 prop?


GreenAce92
05-09-2008, 11:26 AM
Hi,

Im getting into 3D/Sport flying and im wondering if i can use the KBM 31/09 with a 12x8 in prop safely on a 12-18C 3c lipo at 1850mah. Will i puff anything up?

thanks.

jdetray
05-12-2008, 03:36 AM
According to the specs for the motor, the largest recommended prop is a 10x4.7. Sounds like a 12x8 would be way too much prop.

- Jeff

GreenAce92
05-12-2008, 03:52 AM
See this here says different though, although i think my 18c is not enough for WOT with a 12x8 in prop. im using 11x8's now instead.

http://www.headsuprc.com/servlet/the-432/2410-dsh-09Y-Outrunner-Brushless-Electric/Detail

im not sure. it seems its ok so far since ive been running it.

thanks for the reply.

jdetray
05-12-2008, 03:59 AM
I have no idea what you are trying to say by linking to the 2410-09Y motor.

Good luck to you!

- Jeff

max-nix
05-12-2008, 04:39 AM
Hi Ace
ck these specs;-)
http://www.ripmax.com/item.asp?itemid=M-KMS108044&selectedtab=070&Category=070

According to this a 9x4.7 on 3s & 10x4.7 on 2s!:<:

Also look at this post by Chellie.

http://www.wattflyer.com/forums/showthread.php?t=34301
Post#3

GreenAce92
05-12-2008, 11:29 AM
Hmmm kinda scary, ive been running an 11x8 prop for a while. I linked that one because Wrench said it was the same motor as the KMS motor and he said Jeff tested it and on that link it says it works best with an EP 11x7 i know mines a slow flyer, but it seems its ok. My lipo stays pretty cool and i dont need WOT for my birds(even with a cam on its plenty!)

Dr Kiwi
05-12-2008, 09:44 PM
It is NOT the same motor as those TowerPro's Jeff is talking about:

What amps are you drawing - the tech data suggests 12A max! Maybe 9x5 GWS HD on 3s might keep it under 12A?

GreenAce92
05-12-2008, 11:25 PM
Wow, well since you guys are puttin it that way, ill cut down on the prop sizes then. i may substitute my 2409 for the job.

CHELLIE
05-13-2008, 02:44 AM
Hi,

Im getting into 3D/Sport flying and im wondering if i can use the KBM 31/09 with a 12x8 in prop safely on a 12-18C 3c lipo at 1850mah. Will i puff anything up?

thanks.

Hi GreenAce :ws: the 31/09 is very much like the 2410-09 TP motor, max prop size I would use on it would be a 11x4.7 a 12x8 prop will be too much prop and will burn up the motor, the 2409-12 motor will only take a 9x5 prop MAX, and you will be at 22.2 AMPS DONT USE a Larger prop than a 9x5 on a 2409-12, with a 3 cell lipo, or you will start to burn up things, Hope that helps, Chellie

Another great application for the 2409-12T is on the GWS C-47. Use the Master Airscrew 6x4 3 blade prop with this motor for scale looks and about 32 ounces of combined thrust. My small 3mm prop adapter works nice with this prop.



A firewall mount and plastic stick mount are included, along with mounting screws. You will need to drill two holes in the plastic mount in order to attach it to the motor. Please look closely at the pictures to see how and where to attach to the plastic mount. The motor sits up higher on the plastic mount than most people think. Always check the tightness of all motor set screws when installing motors. The set screws require a 1.5mm Allen wrench.


Propeller data for 3-cell Lipo batteries (11.1 volt):

GWS props fit the 3mm shaft on this motor perfectly - no adapter needed. APC and Master Airscrew props require a prop adapter or prop saver for a 3mm shaft (available in my store).
The GWS EP9050 prop produces about 32 ounces of thrust at 22.5 amps with a pitch speed of 46 mph. Avoid constant wide open throttle.
The APC 9x4.5E prop produces about 31 ounces of thrust at 22.5 amps with a pitch speed of 41 mph. Avoid constant wide open throttle.
The APC 8x4E prop produces about 28 ounces of thrust at 20 amps with a pitch speed of 43 mph.
The GWS EP8040 prop produces 27 ounces of thrust at 18 amps with a pitch speed of 46 mph. This is the prop to use if you want to stay on the conservative side!
The APC 8x6E prop produces about 25 ounces of thrust at 22.5 amps with a pitch speed of 55 mph. Avoid constant wide open throttle.
The GWS HD8060 prop produces 24 ounces of thrust at 21 amps with a pitch speed of 58 mph. Avoid constant wide open throttle.
The Master Airscrew 8x6 3-blade prop produces about 27 ounces of thrust at 23.5 amps with a pitch speed of 54 mph. Great for scale looks and high speed, but do not run at wide open throttle for long periods.
The Master Airscrew 7x4 3-blade prop produces about 20 ounces of thrust at 16 amps with a pitch speed of 47 mph.
The TP 7x5E prop produces about 22 ounces of thrust at 19 amps with a pitch speed of 60 mph. Great for use on the Multiplex Easy Star, Parkzone Stryker, and Zagi.
The APC 7x5E prop produces about 22 ounces of thrust at 19 amps with a pitch speed of 60 mph.
The GWS EP7035 prop produces about 18 ounces of thrust at 11 amps with a pitch speed of 49 mph.
The APC 6x5.5E prop produces about 14 ounces of thrust at 12.5 amps with a pitch speed of 54 mph.
The Master Airscrew 6x4 3-blade prop produces about 16 ounces of thrust at 12 amps with a pitch speed of 54 mph. This works very well for the GWS C-47.

GreenAce92
05-13-2008, 02:53 AM
Alright well i will have to apply this for my pusher UAV ill make a switchable mount to use either the KMS motor or the 2409-12 depends on what kind of a "mission" i get into lol. KMS for bombing and 2409-12 for attack runs. Hehehe... all carrying the camera of course.