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Old 03-15-2011, 02:00 AM   #1
gramps2361
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Exclamation Help me figure out these motors.




I have 2 480 motors mounted and ready to go from hobbypartz. Here is the link to the motors and specs. One motor has a strong cog and one spins easier.
http://www.hobbypartz.com/alpha-480-...ess-motor.html

I had a chance to check the motors out with a 9x6 prop first off I need to go to a 10x4 to get more out of the motors.

The right motor was 182 watts 15.64 amps and 8970 rpm's this is the motor that does not have a strong cog to it.

The left motor was 179 watts 15.36 amps and 8820 rpm's. this was using 25 amp 3cell 1800mah run in parallel the batteries on there first charge.

Now I am wondering if I should use this setup or order a matched pair from HURC.
Any of you motor gurus give me me some input .
John
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Old 03-15-2011, 02:05 AM   #2
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HI John
Building a twin are we
They seem to be very close from your tests,i dont know if your going to ever find a perfectly identical pair
I would use them
Take care dear friend
Yours Hank

"When wild the head-wind beat,Thy sovereign Will commanding, Bring them who dare to fly, To a safe landing."
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Old 03-15-2011, 02:05 AM   #3
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I don't think it will cause any big issues. I say go forth.
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Old 03-15-2011, 02:37 AM   #4
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One other question I used a tachometer to get the rpms how do I figure that out with the 1020 kv that is listed for the motor if the prop was at 8970 rpms. Gut feeling again is the props are to small and I am getting to much rpm's from them.
This is the first time using a tach so new learning curve for me. By the way it is a APC 9x6 prop I am going to buy some 10" slow fly props to try out only ones I can find in that size for a pusher prop.

Hank here is a pic Rich model P-38 ARF.


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Old 03-15-2011, 02:57 AM   #5
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You're going to like the way that bird flys John. I had one and it was a super flyer. Take off and landing was great with the tricycle gear. The only thing I didn't like about mine was it was marginal on power. It flew fine but I had to fly at 3/4 to full throttle all the time. Mine had just under 400 watts total.

Tom
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Old 03-15-2011, 03:12 AM   #6
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Thanks Tom I should get a combined 400 plus watts when I get the new props in. I read your post in the thread about that very thing, so I figured I would go with a slightly bigger motor.
How did you glue on those plastic covers on the back of the fuse. I tried CA and poking holes in the covering and the first one popped right off, so I haven't bothered with them yet.
John
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Old 03-15-2011, 03:16 AM   #7
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Originally Posted by gramps2161 View Post
Thanks Tom I should get a combined 400 plus watts when I get the new props in. I read your post in the thread about that very thing, so I figured I would go with a slightly bigger motor.
How did you glue on those plastic covers on the back of the fuse. I tried CA and poking holes in the covering and the first one popped right off, so I haven't bothered with them yet.
John
I used a small amount of epoxy and held it in place with blue painter's tape until it dried. You can hold them up to the fuse and put blue tape around the perimeter so glue doesn't get on the fuselage then glue them in place. Once they are dry, pull the tape off the fuselage.

Tom
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Old 03-15-2011, 03:21 AM   #8
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This is likely the same motor with some pretty reliable prop specs from HeadsUpRC.
Jeff agrees with your 25A on 9x6/3S.

On any of those kind of motors getting 2 that will be dead identical is just about impossible. There are just too many variations in winding count, magnet tolerance, magnet spacing, etc.
Yours are very close.

Don't be put off by cogging. The only thing it shows is magnetic attraction of the iron core stator to the magnets. It bears no relationship to power output.

fly
If you're going to learn to fly them, you have to learn to fix them.
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Old 03-15-2011, 07:34 PM   #9
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flydiver I think Jeffs motor puts out more power than the Hobbypartz motors.

Tom thanks I thought I would be better off with using epoxy to hold them on. Looking forward to the maiden flight. Been a while since I had that adrenaline going thru the veins.
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Old 03-15-2011, 07:42 PM   #10
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Originally Posted by gramps2161 View Post
flydiver I think Jeffs motor puts out more power than the Hobbypartz motors.
.
Ignore the color-take a GOOD look. I think they are exactly the same motor.
At least Jeff actually tests them. All the rest of the specs are somewhat suspicious marketing data.
Came from here.
http://sxicl3082.en.china.cn/selling...3639061_1.html

fly
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Old 03-15-2011, 07:57 PM   #11
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I see what you mean about them looking the same just different finish. Jeffs have a higher rating compared to the Hobbypartz motor which show a lower amp and watt"s.

So many motors I wonder how many makers produce motors to the specs of the vendors.
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Old 03-15-2011, 08:21 PM   #12
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Originally Posted by gramps2161 View Post
I see what you mean about them looking the same just different finish. Jeffs have a higher rating compared to the Hobbypartz motor which show a lower amp and watt"s.

So many motors I wonder how many makers produce motors to the specs of the vendors.
There probably aren't a lot of actual motor manufacturers, especially these cheap ones. That factory makes a lot of the re-branded motors to (maybe) some kind of spec.
In my own experience the specs provided are just a starting place. Actual performance is subject to a lot of particular variables the most common one being winding consistency. I've taken apart a few motors now and the specs can often be off by > 200KV and winds can be all over the place. That's why I say yours are will within tolerance. You would have to buy 10 and test them all exactly the same to probably do much better. There can be that much variation in testing depending on air temp, motor temp, battery temp, battery charge state when readings were taken, etc.

fly
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