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Old Jun 17, 2009, 12:36 AM
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Great Planes Rimfire .55 42-60-480 Brushless Outrunner

Hi

Has anybody expierience with this motor ? , I've been searching a bit but can't find much .
How robust and efficient is it ? . I need a lighter motor for my plane and this is conciderably lighter than my AXI 4120 .

The general consensis seems to be that its optimistically rated but I only need to prop it for 800-900 watts

Regards
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Old Jun 17, 2009, 02:11 PM
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Portland Intl, Oregon, United States
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I have a pair of these in a Deuces Wild running on 6S with 12x12 props. They each pull about 900 watts and give the 12 lbs plane excellent performance. I have about 2 dozen flights on them and they haven't skipped a beat. As far as efficiency numbers go I can't tell you. These motors are still pretty new but I do have a 42-50-1000 I've been running 600 watts on for a couple years now and it still runs like a champ. I will be buying Rimfires in the future (in fact I have a couple on order for my C-160)

-Frank
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Old Jun 18, 2009, 12:56 PM
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Thanks Frank

The Rimfire motors do not seem all that popular which is strange as its such a strong brand .
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Old Jun 18, 2009, 01:09 PM
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Quote:
Originally Posted by FrankW
I have... a Deuces Wild...
Truly one of the coolest planes around especially on a low, fast flyby. Sleek, and the sound!

mw
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Old Jun 18, 2009, 01:22 PM
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Yeah, I don't understand why they're not so popular either, I like all mine.

I'm having issues with my DW lately. The starboard motor pulled out the firewall in flight. They use cheap, weak, glue and it just let go. I glued it back with some epoxy and reinforced the port firewall. I don't have a radar gun, but I'm betting it's getting close to the 100 mph mark with what seems to be unlimited vertical. I have an onboard airspeed indicator, but I've been too lazy to put it on.

-Frank
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Old Jun 18, 2009, 02:49 PM
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Eden Prairie, MN
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Can anyone explain to me why the .55 and .46 are the same body size (listed the same weight even) and the .46 is rated at much higher watts surge and continuous than the .55? Is the .55 a newer wind and maybe the info has been updated on it, but not the .46?
Curtis
Edit: Is it the wind? Higher number of turns = smaller diameter wire and less current capability? I am confused why they wouldn't have a higher voltage rating to get more power out of it.
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Old Jun 18, 2009, 06:37 PM
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Portland Intl, Oregon, United States
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I don't know why they even tried to compare their motors to glow engines. It's comparing apples or oranges. IMO just go by Kv and wattage ratings. What I really like is that they give amp draw amounts for specific props at specific voltages. It allows me to estimate closely what kind of power I'll get out of the set-up I want to use before buying it. Ohm's law rocks! Of course I use a Whattmeter to make sure what I'm getting is what I want.

Beau, you're correct; higher turns = smaller wire = less current capability. I have been running the 42-60-480s (.55) on 6s ever since I got them and I haven't had a problem yet and I don't see one happening in the future.

-Frank
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Old Jun 18, 2009, 07:06 PM
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Quote:
Originally Posted by SA_Flyer
Hi

Has anybody expierience with this motor ? , I've been searching a bit but can't find much .
How robust and efficient is it ? . I need a lighter motor for my plane and this is conciderably lighter than my AXI 4120 .

The general consensis seems to be that its optimistically rated but I only need to prop it for 800-900 watts

Regards

Ok, one thing you should note is that the parts of a motor that make torque are relatively heavy--copper and iron. If one motor is much lighter than another, then most likely it is a smaller motor and will not make the power that the heavier motor makes. Especially look at how long the flat region of the out runner can is. This is where the magnets fit, and also how long the iron stator is. A lot of motors look long, but are mostly open air. Air or aluminum do not make power!

Now if you don't need the power, or the AXI you have is oversized for your application, then maybe you can get by with the weaker and lighter motor.

Other than what I said above, which is general for any comparison of two motors, I have nothing for or against the RimFire line of motors.
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Old Jun 19, 2009, 03:03 AM
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Hi Alan you raise some valid points.

I am still mulling over if its worth my while spending $80 on loosing 5 ounces as the plane is within the manufacturers weight range and with a wing area on 691 square inches it will only make a difference of 1 ounce per square foot.

Spending the money on a 3rd battery pack probably makes more sense
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Old Dec 18, 2010, 04:29 PM
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Purchased the Rimfire .55 last month, and ran several tests with it on 6s-3800 and APC 15x6, 15x8. It's a strong motor, but not any stronger than some lighter ones (Castle Vertigo 74-24-750 on 4s with 15x8, or Hacker A40-14s, 530 kv on 5s/6s). Real weight is 290g (motor only), not 268g as they claim.

One thing I dont like about this Rimfire is that it runs too hot (~ 150F). For $79, I'd spend $10-$15 more to get Hacker/Scorpion, or spend $50 less and get an Infinite A4020-540 ($30.00) that does not get hot running at 1200w.

Disappointed.

Vien

Edit: The Rimfire .55 got above 150F after several short runs with APC 15x6 (41A) and 15x8 (47A). Each run was no longer than 10s, and I expect an $80.00 motor rated at 45A continuous and 85A burst should be able to handle that.
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Old Dec 18, 2010, 05:12 PM
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Moab, Utah, USA
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Tower Hobbies lists this motor at 45 amps max continuous and 830 watts max continuous. You are running it at 1200 watts which is about 54 amps with a 6s battery and you complain because it runs hot. Go figure.

Larry
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Old Dec 18, 2010, 06:17 PM
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Originally Posted by Lnagel View Post
Tower Hobbies lists this motor at 45 amps max continuous and 830 watts max continuous. You are running it at 1200 watts which is about 54 amps with a 6s battery and you complain because it runs hot. Go figure.

Larry
I think you misunderstood what I wrote, and I didn't make it very clear. I said the Infinite 4020-540 ($32.00) did not get hot at 1200w.

The Rimfire .55 got really hot at 6s & 40A-45A draw (~ 900w-1000w) in several runs (4-5 runs) of 10s long (30s - 1min break between them).

It is rated for 85A burst, I doubt that.

For 3D flight (such as in the 3DHS SC 57"), the Rimfire should be ok for short burst of 45-55A (in flight), but there many other lighter motors that perform better (same price, or cheaper).

Vien
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Last edited by vienquach; Dec 18, 2010 at 06:26 PM.
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Old Dec 18, 2010, 07:25 PM
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Sorry for the misunderstanding. If you are saying that the Rimfire gets too hot at 40 to 45 amps then you have a right to complain.

Larry
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Old Dec 18, 2010, 07:26 PM
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Chattanooga, Tennessee, United States
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A long time ago I reviewed some Rimfire motors and my conclusions were the same as yours, Vien... their outrunners are FAR too optimistically rated and they get hotter than h... if you go anywhere near their rated limits. Their ratings for inrunners (Ammo) seem to be a bit closer to the truth.
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Old Dec 18, 2010, 07:48 PM
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Quote:
Originally Posted by Dr Kiwi View Post
A long time ago I reviewed some Rimfire motors and my conclusions were the same as yours, Vien... their outrunners are FAR too optimistically rated and they get hotter than h... if you go anywhere near their rated limits. Their ratings for inrunners (Ammo) seem to be a bit closer to the truth.
No problem Larry.

Doc. I've read many of your reviews and really enjoy them.

My little test stand have met its limit. I tested a Motrolfly 4325-295kv motor yesterday with 8s-4000-30 and 20x10 prop. I stopped at around ~ 65% throttle (~67A since my ICE 50's limit is 70A).

Tested the Infinite A3014-972 kv today. Seems to be a really good motor for $20.00.
Nothing fancy, just want to share it to you.

Vien
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