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Old Nov 02, 2014, 07:12 AM
Still Flying
OldRCNut's Avatar
United States, WI, Fond du Lac
Joined Mar 2013
161 Posts
Motor

Quote:
Originally Posted by pjdog350 View Post
I see so much on the forum about these MMW -15 and the -17 motors. I've been putting off getting some? Sooner or later a brushed motor replacement is coming for sure as I fly almost every day. Plus I have a pretty good pile of UMX warbirds. I still have a small stock of MSRX motors in the spares box. But the reduced flying time to me is not worth the upgrade. Plus it's still a brushed motor! them I have to upgrade all my batteries to at least 250 MHA's.

I just can't see it. I'd rather have more flight time at a slower speed.

Well - I guess I just showed that I'm getting old!!! 20 to 25 years ago I would have got a motor to big of the plane, Put a tuned pipe on it and upgraded the nitro content for more speed.

Yep! Age is getting the best of me.

jack
PJ,

I don't disagree with your your point. I am struggling with the same things. My MSRX motor in my P51 is getting old and I may just put another MSRX motor in it. The MSRX type motor and Eflite 150 mAh 45C cells makes a great upgrade for the little warbirds. The motor is a little heavier than stock so it also puts some weight up front where these birds tend to need it.

I ordered the MMW -15 motor as an experiment since I was reading about them. I then ordered the Miniaviation batts to go with it. It is a powerfull combination but at a cost, short flights. The combination seems to be the ultamite for brushed power for the little warbirds at this time.
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Old Nov 03, 2014, 03:59 PM
Fox Four,..Guns, Guns, Guns!
jwoocrew's Avatar
United States, CA, El Dorado Hills
Joined Jun 2011
98 Posts
Quote:
Originally Posted by OldRCNut View Post
PJ,

I don't disagree with your your point. I am struggling with the same things. My MSRX motor in my P51 is getting old and I may just put another MSRX motor in it. The MSRX type motor and Eflite 150 mAh 45C cells makes a great upgrade for the little warbirds. The motor is a little heavier than stock so it also puts some weight up front where these birds tend to need it.

I ordered the MMW -15 motor as an experiment since I was reading about them. I then ordered the Miniaviation batts to go with it. It is a powerfull combination but at a cost, short flights. The combination seems to be the ultamite for brushed power for the little warbirds at this time.
I have stated this before in other UM threads. On my first plane the T-28, I had gone through replacing the stock motor with a direct replacement because they were readily available at my LHS. The first time maybe after 25 flights and then what seemed to be 15-20 on the second motor. I enjoyed flying this thing so much but I soon realized I was going to go broke in order to keep my T-28 flying. If it wasn't for the information I found in RCGROUPS, I would have abandoned my purchase of other UM's to add to my collection. I have invested in a more reliable motor with a bit more power but still utilizes the 1S 160mah batts and 4-5 minute flight times. Knock on wood, the more reliable motors have lasted 2 years now on my T-28 and I have lost count. As the stock motors burn out on my new planes, I have replacements standing by to go in them. My P-40 was my last purchase and that motor died with less than 15 flights.
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Old Nov 12, 2014, 09:36 PM
Cap'n
Dinghy's Avatar
United States, OR, Springfield
Joined Dec 2013
209 Posts
Quote:
Originally Posted by jwoocrew View Post
I have stated this before in other UM threads. On my first plane the T-28, I had gone through replacing the stock motor with a direct replacement because they were readily available at my LHS.............
............
..... I have invested in a more reliable motor with a bit more power but still utilizes the 1S 160mah batts and 4-5 minute flight times. Knock on wood, the more reliable motors have lasted 2 years now on my T-28 and I have lost count. As the stock motors burn out on my new planes, I have replacements standing by to go in them. My P-40 was my last purchase and that motor died with less than 15 flights.
What is this more reliable motor ?
Many suggest other motors, most end up to be trade offs, power-flight time-longitivity....
Would love to know what has works so well for you.

Love the UM's and UMX's....just hitting dead ends with replacment motors.
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Old Nov 13, 2014, 10:56 AM
Fox Four,..Guns, Guns, Guns!
jwoocrew's Avatar
United States, CA, El Dorado Hills
Joined Jun 2011
98 Posts
Quote:
Originally Posted by Dinghy View Post
What is this more reliable motor ?
Many suggest other motors, most end up to be trade offs, power-flight time-longitivity....
Would love to know what has works so well for you.

Love the UM's and UMX's....just hitting dead ends with replacment motors.
PM sent
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Old Nov 15, 2014, 09:04 AM
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doha Qatar
Joined Jan 2004
451 Posts
Inquiring minds still want to know which is the more reliable motor...
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Old Nov 15, 2014, 06:13 PM
Fox 1
RocketRobin's Avatar
Canada, AB, Calgary
Joined Jan 2013
574 Posts
Quote:
Originally Posted by Joe Perrone View Post
Inquiring minds still want to know which is the more reliable motor...
According to sources close to the National Inquierer, motors with the least amount of prop strikes last the longest.
Inquierer specialists suggest this is due to micro-fusion of the brushes to the armature when the motor is stopped and power is on.
Biologists close to the Inquierer insist the problem has deeper roots. According to Inquierer specialist Dr. Epstien: "anyvon zat grass lands dis vit power on had intellectual agility of ze shmall eggplant. Not ze large eggplant, but ze shmall von".

Cheers!
Rocket
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Last edited by RocketRobin; Nov 15, 2014 at 06:55 PM. Reason: grammar
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Old Nov 15, 2014, 06:16 PM
LiPo-Sucker & Airframe EMT
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Charlottesville, Virginia, USA
Joined Aug 2010
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Zank you, I'm sure!
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Old Nov 16, 2014, 09:29 AM
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United States, FL, Hudson
Joined Apr 2013
832 Posts
Makes sense to be. Thanks rocket?

Damn eggplants
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Old Nov 29, 2014, 07:56 PM
I'm BIG on micros
Canada, ON, Brampton
Joined Mar 2011
588 Posts
I've got a question. What voltage comes out of the servo plugs? Can I connect LEDs to the + and - of a servo plug for nav lights? Also, is there a lightweight setup I can use for gun lights?

And is it possible to FPV this? FT had a good article about a 3.7g setup
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Old Nov 29, 2014, 07:59 PM
RCG Hover King
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United States, LA, St Francisville
Joined Apr 2014
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Quote:
Originally Posted by JSS4 View Post
I've got a question. What voltage comes out of the servo plugs? Can I connect LEDs to the + and - of a servo plug for nav lights? Also, is there a lightweight setup I can use for gun lights?

And is it possible to FPV this? FT had a good article about a 3.7g setup
I believe the servo plugs output 4.2V.

It is definitely possible to FPV the Spit:

http://www.rcgroups.com/forums/showthread.php?t=2234785
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Old Nov 29, 2014, 08:05 PM
I'm BIG on micros
Canada, ON, Brampton
Joined Mar 2011
588 Posts
Thanks. I've also been looking for a suitable gun light setup. I was thinking a 555 timer coupled to a servo board but I think that would be too heavy. Is there a better more suitable lightweight solution?

Thanks
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Old Nov 30, 2014, 03:16 PM
Still Flying
OldRCNut's Avatar
United States, WI, Fond du Lac
Joined Mar 2013
161 Posts
Micromotor Warehouse -15 Motor with Miniaviation Batts

A while back I posted some rpm data with a Micromotor Warehouse -15 motor installed in my Spitfire. I had run with the Eflite 150 mAh 45C batts and now I have added data with Miniaviation 220 mAh 45C batts.

This data is the peak immediate rpm, then same data after 30 seconds at wide open throttle. This data is all room temp data taken with a TNC Tach. The numbers are the average of the same three batteries. The data is with the 9T pinion and stock 4-blade prop on a MSRX motor with about 40 flights on it in the Spitfire. The MMW -15 motor uses the nylon 9T pinion that comes with it, stock prop and the motor has about 6 flights on it. The batteries have been peak charged immediately before the test.

MSRX Eflite 150 mAh 45C at peak 7440, plus 30 sec 7240 rpm
MMW -15 Eflite 150 mAh 45C at peak 7780, plus 30 sec 7420 rpm
MMW -15 MA 220 mAh 45C at peak 7860, plus 30 sec 7460 rpm


The MMW -15 is a nice upgrade in rpm over the MSRX/AS3Xtra type motor. The MSRX/AS3Xtra is a significant upgrade from the stock or Bravo SX type motors that are about the same in output. If you search my postings you will find data on the various motors.

The Miniaviation batteries do give a bit extra rpm and better run time in flight. Bear in mind that a small static rpm increase can be a significant change in performance at the top of a propeller curve.

At this time I feel that the MMW -15 motor with the Miniaviation batts are likely the best performance for 1S brushed power in our little UMX planes.
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Old Nov 30, 2014, 08:25 PM
Fox 1
RocketRobin's Avatar
Canada, AB, Calgary
Joined Jan 2013
574 Posts
Keep in mind the Miniaviation lipos come with a considerable weight penalty: at 6.1g they are almost 50% heavier than the stock lipos. However, with a little tweaking they do fit into the Spit battery hatch.

At this time I'm not convinced that the MMW-15s are top notch. I have some MMW-17s on order for my new Mk.XIV Spit mod.

Cheers!
Rocket
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Old Dec 01, 2014, 01:09 PM
Turbo tuner
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United States, UT, Bountiful
Joined Apr 2012
123 Posts
Quote:
Originally Posted by RocketRobin View Post
At this time I'm not convinced that the MMW-15s are top notch. I have some MMW-17s on order for my new Mk.XIV Spit mod.

Cheers!
Rocket
Rockety,

You are correct! I've tried the MMW-17's and they are noticeably faster than the MMW-15's. I flew one in my 100mm X 100mm four blade Meg P-51's and it was fabulous for 10 flights. The only down side was that I only had three minute flight times from the MA220's with the -17 installed. I measured more than a 1 watt increase in power output(Up from 12.45 to 13.6 watts on the three blade prop) from the -17 over the -15 on my WattsUp meter.

But the power rapidly dropped off after flight number ten as the -17 burnt out its brushes. I have nearly 100 flights on my old modified P-40 with its original -15 and its as strong now as ever. I do think the 112mm X 90mm three blade prop I run on it is slightly easier for the motor to spin though.

It is amazing the difference between even the MA 220 cell's with some of them noticeably faster than others. These -15 and -17 motor's tax the 1S lipo's right to their limits and any ESR variation between the cells is noticeable in flight performance.

Regards,

Turbo
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Last edited by turbodpv; Dec 02, 2014 at 02:12 PM. Reason: Additional detail
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Old Dec 01, 2014, 07:28 PM
Fox 1
RocketRobin's Avatar
Canada, AB, Calgary
Joined Jan 2013
574 Posts
Thanks for the heads up Turbo.
I might try gearing down to an 8T pinion to reduce the current load on the brushes a little.

Cheers!
Rocket
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