UM motor upgrade using Solo Pro and Bravo SX motors
Time for a separate thread.
After deciphering some of the posts from XR 650:
I decided to try it for myself.
My Solo Pro motor is being flown in my V1 Sukhoi with GWS 5043 prop using Thunder Power and Hyperion 25C batts.
Nine Eagles Solo Pro motors.
Solo Pro motors are an exact size match to Mustang, 4-site, Sukhoi, etc.
8.5mm x 20mm length can.
Advantages are suppose to be:
Much longer lasting motor.
Longer flight times.
Direct fit in stock gearbox.
RPM readings and flight testing shows the SP motor to be equal in power to the Mustang, 4-site, Sukhoi xp... (black end bell) motors.
Pulled the pinion gear off the Solo Pro with this:
GWS Micro Gear Puller Tool...
Drilled the Sukhoi pinion to slip on the Solo Pro motor shaft.
Used my Davis Model Products Pocket Drill...
Use a #61 drill bit. (.039 Diameter)
I measured the SP motor shaft dia. at 0.97mm
Found a drill bit in the Pocket Drill that measured 0.98mm
Didn't need any tools to hold the stock pinion while drilling.
It was a quick ream out while holding with my fingers.
Was an easy slide-on fit.
Attached the pinion gear with standard slow cure J-B Weld.
Cut SP motor wires about 1/2" from end bell.
Soldered on Mustang motor wire with stock connector.
Used 0.8mm heat shrink from DX to cover the wire solder joints.
My motor has been running perfectly.
I've been flying 160, 180 and 240mAh packs.
This motor is sweet!
Mine runs quiet and smooth.
Others have starting testing these motors as well.
Please post your results!
Nice work RC thanks for posting this :)
Unfortunately, it looks like you caused a run on the motors, since I can't find any more in stock.
I've done two, following RCBABBEL's instructions. No problems at all. If you're looking for a bit, I used a number 61 drill bit which is 0.039" or 0.991 mm... It was still very thight fitting the gear. I did it by just holding the drill bit in my hand though, so RC is right, it's very easy to do and in my case, no tools needed... My next motors, I may try a number 60 drill bit which is a bit bigger, and let the JBWeld fill in, so I don't have to push the gear as hard as I had too. (60 is 0.040"or 1.016mm).
My advice, try the motors first, before you do anything else with them. I got two, and they definitively do not sound the same. One is very noisy, and the other one is very quiet. So by testing them before you start modding them, you know it's not something you did (like pushing the gear in and breaking brushes). As usual, you can use any 1S battery, and push the motor connector straight in. Spin like crazy, but that's a quick and relatively safe test.
For my first two, I'm not doing any break-in at all (since I never did any on my original brushed motors either). But it may be a good idea to do a soft break-in on yours (running low current for a while before you go WOT).
It's easy to do if you have any soldering skill. I don't expect to get better motors from Nine Eagles myself. I'm just hoping to be able to get about 3 motors for the price of one. It took me only a few minutes to do it, so time is not even an issue here.
I would say you definitively need a gear puller. I was thinking about making my own but trust me, the real thing works wonderfully, and after about 2 or 3 motors, it's paid for already....
If you don't push the gear all the way in, I think it's a good idea to make the motor spin after you install it, so any excess JBWeld inside the hole on top of the shaft, will be spreaded evenly inside the gear. Then, I hang it upside down in case it's trying to drip... Sure enough, if you push the gear all the way in, then, you just wipe the excess JBWeld. But it may be harder to get the gear back if you change it again (after all, no matter what, those Nine Eagles motors won't last forever either, so these gears are precious now). If you don't push it all the way in, it's simply easier to align the gear puller...
Thanks XR 650 for finding this.
Thanks RCBABBEL for making simple instructions on how to do it.
Will record all my flights as well and report any Nine Eagle failures motors here. Hopefully, only in a year or two from now :D
*burp*...'scuse me. (eating lunch) :D
Subscribed. My two SP motors are on the way...being an HK platinum member hath its small rewards. :D:D
Ordered the dang gear puller also...spendy buggah! (I figure I'll be pulling lots of gears for my bee-yoo-tee-full new UMX Extra soon enough!!):D:D
Still haven't tried my re-geared mSR motor in my 4Site...waiting for the hubbub to die down about flying @ work. :rolleyes: I'm expecting no difference, really...other than perhaps a motor that lasts more than 25-50 flights. :rolleyes:
Bud, hubbub Bud :D
Jealous Bud :rolleyes:
I believe it's the number of orders you have placed. Of course, I could be wrong. Most assuredly NOT how many items are on your wish lists....I'd own the joint! :D Forum posts may have something to do w/ it also.
(Sort of O/T but I guess I should give HK a nod)....Did I mention the "freebie" ($36 shipping lol) mystery package I just got from HK? Heheh...rather nice of them...might turn out to be a good pattern ship (came complete w/ three swervos, KD 2205 motor and SS 18amp ESC...a burly power setup, but this dog is heavy lol:
Bud, finally got his freebie Bud :D
Appreciate the SP motor feedback!
Good pointers on the assembly RG.
MM is now saying end of Oct. for their next shipment of motors.
They sent me a $7 discount coupon to ease my waiting pain.
Don't no on HK arrive date.
My HK platinum status seemed to kick in when my spending hit $2000.00
Has anyone pulled one of these apart to see if the brushes appear to be any thicker or stronger than the stock motor? I imagine these are good replacement motors but I have a hard time believing the claims of longer life, more power, and less current draw.
C'mon, they are a big $5.... I'll wait until one of them craps out before I open it... By the sound of it, they seem to be like the batch of original motors that had little carbon brushes. Very quiet for sure.
No one is willing to trash a good motor yet.
Right now they are 'Out of Stock' or expensive elsewhere.
Each additional flight I get on my $4 motor just makes me smile.
any figures on the sp, whatever you have, like volts/amps/rpm/thrust with props like 130/70, 160/70, gws 5/3, 5/4.3?
we also need those figures on the clear and black end bell, so we can compare them.
also which plane you are using, how it flies with the sp compared with the other 2?
Drill bit size:
Assembled my last three SP motors over the weekend.
RG used a #61 bit and described it as a very tight fit.
The bit I'm using is perfect.
The pinion is an easy slide on fit that allows just enough space for the glue.
Measures at .98mm or .038"
Chart says it's a #62
Also recommend to measure your stock motor.
Try to match the distance from the back of the motor to the front of the pinion gear.
All of this was done with my handy dandy Digital Caliper.
My brother picked it up on sale for $11.00
Should have never gone all these years without one!
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