brushed mod

[Norwest]

I was reading in Big Jim's booklet about brsushed motors. Ok, if a person would have a really good 540 motor , a 12/3 and to get more torque would take the shell off another 540 and wrap and solder the shell on. I take it from BJ, it would show less rpm but increase torque, am I correct? I have plenty of 540's and thought putting it in a balsa 22" mono with a Oct. 630 prop for the H### to see what happens. Replies are welcome. Winter gets to long and boring!!! Oh yes, thanks!

[pescador]

I raced trucks years ago and motors were “stock” or “modified “, stock motors had the cans sealed preventing you from resurfacing the commutator with a comm lathe. (Most of the time :) ).
On modifieds the end bell is removable so you can change armatures to different winds, change bearings and easily cut the coms.
What are you hoping a new can will do for you keeping the armature the same? Unless the magnets are tired from being hot.


Sent from my iPhone using Tapatalk

[Norwest]

I did post but something screwed up after all my typing and said **** it. I'll reread Big Jim's book again.

[Fluid]

One of Ed Hughey’s “tricks” he passed on to me many years ago (long before Big Jim) was to increase the magnet strength by using part of another motor can. I used the trick for years, and it did increase the motor efficiency (and yes rpm did decrease).

I usually cut a 1” wide ring off another can (magnets removed first), the made another cut turning the ring into a “C” shape. I slid the ring onto the subject motor centered on the magnets. Along with polarized brush springs and a few other minor mods my motors were pretty quick and won a few National Championships for me back in the day.


.

[pescador]

Those were the days, motor testers, comm lathes, cutting brushes into every shape imaginable, spring testers, super secret break-in and comm drops. It was fun stuff, I still have all my gear.


Sent from my iPhone using Tapatalk

[NativePaul]

It is called a flux ring, and increases the effectiveness of the magnets resulting in a higher KT and a lower KV. Many can motors come with them.

[nohope]

Yeah...the radio box at the stern is over an 1 1/2 taller than the steering boot holes. The radio box was designed to be cowl but I'm going with a regular cowl.

[Panchothedog]

If your goal is to increase torque at the cost of loosing RPM in order to turn a larger prop a Hughey gear drive will do the trick just fine. I don't think he is in business any more, the last time I talked with him, a few years ago he was in poor health. But his stuff was quite popular 20 plus years ago and I bet you could find used gear

[Fluid]

Ed shut down his business several years ago. He passed away in March.



.

[Norwest]

Thanks for the replies. Yes, on ED's gears, I have 2 sets and ED sent me some silver brushes over the years and some data on best ratio and etc. What a loss!!!!!!!!!!!!!!!

[SJFE]

Having used and melted down more than my share of brushed motors in boats. The best results I had were with drill motors. Idk if Steven still sells the 700sc but it had more torque and lasted longer than any rc vehicle motor I ever ran. I even bought and tested drill motors from Hitachi and Dewalt. Both where really good. Just a thought of you're gonna run brushed motors.