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BP Hobbies 4120 vx Axi 4120

Old 11-23-2008, 08:09 AM
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N1EDM
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Default BP Hobbies 4120 vx Axi 4120

I'm contemplating another electric. I currently run a Axi 4120/14 in my Twist 40.

I noticed that BP Hobbies has an equivalent, their own BP A4120/7. I'm curious about three things with this motor, performance, quality, and design.

For performance, I am curious if the motor will perform on par with the Axi using the same battery pack/ESC setup.

For design, I'm wondering if it is a direct bolt-in replacement, both on the motor mounting and on the radial mount.

As for quality, I've heard that some of the cheap imports are poorly constructed and have a bad reputation for magnets falling off, etc. I wonder how robust the construction of theA4120-7 is.

Thanks for your input, guys.

Bob
Old 11-23-2008, 09:30 AM
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skinnerfam95
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Default RE: BP Hobbies 4120 vx Axi 4120

Check out http://innov8tivedesigns.com/ The quality is exceptional and the prices are a bit better than the AXi motors.

Use this calculator instead of just matching the numbers.

http://www.innov8tivedesigns.com/#P10
Old 11-23-2008, 11:15 AM
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N1EDM
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Default RE: BP Hobbies 4120 vx Axi 4120

Hello Skinnerfam,

Have you actually used these motors yourself? What's your opinion about their reliability. Still looking for others opinions on the BP Hobbies motors - that's one of my primary questions.

Also, are there any specs that would show the mounting dimensions? I'm looking for a drop-in replacement for that Axi, that's part of what I'm looking for.

Thanks,

Bob
Old 11-23-2008, 08:22 PM
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skinnerfam95
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Default RE: BP Hobbies 4120 vx Axi 4120

I've found Lucien Miller to be very responsive. I'd suggest mailing him directly. I do own the 4020-16 and it looks the x-mount is 41mm square on centers...

I own two Scorpion motors. Shamefully, they've been sitting for about a year as other things have taken priority. I can say without a doubt, they are of the highest quality in regards to manufacturing and appearance.
Old 03-01-2009, 12:01 PM
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dLdV
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Default RE: BP Hobbies 4120 vx Axi 4120

I've had a few of the BP outrunners and they all live up to whatever posted specs are published. The BP's may be slightly heavier and be a few percent less efficient than their Axi equivalent, but I can easily live with the difference considering the cost advantage. I've had no reliability problems whatsoever with the BP's. The service is generally good and they ship quick. BP has been a good source.
Old 03-01-2009, 08:36 PM
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N1EDM
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Default RE: BP Hobbies 4120 vx Axi 4120

Thanks... As it turns out, the 4120 would not work for my new project, electrifying my Sig Rascal. I did get a BP Hobbies 2826/4 which (at time that I bought it) compared itself to a Axi 2826. I notice that the comparison is no longer mentioned in the BP Hobbies literature.

It also states that one should run it with a 13" or 14" prop. I was skeptical, but ran the 13x6 prop. That was way too much prop for that little motor. I've ordered a few 10" - 12" Cermark NeoDym's to try out. Unfortunately, the ones that I want to buy are temporarily out of stock. Once they're back in, I'll run some tests on the BP Hobbies 2826 and see if/how they differ from comperable APC's.

Thanks for the input.

Bob
Old 03-07-2009, 09:43 PM
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Eplane65
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Default RE: BP Hobbies 4120 vx Axi 4120

My real concern with some of these cheap motors is that the bearings are so cheap that the reliability is questionable.
Old 03-08-2009, 10:51 AM
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N1EDM
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Default RE: BP Hobbies 4120 vx Axi 4120

In fairness, I have a friend who runs these motors pretty hard, and he hasn't had any bearing issues. I can't talk from personal experience yet. But, it's something to watch out for.

Bob

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