540 Motors and their uses

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540 Motors and their uses

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17 July 2012 at 20:45 #35307
mike farrell
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@mikefarrell21522
Hi All I have a selection of 540 motors from 24 turn basics to 6 turn superfast free runners. Problem is I,m not sure where I go with props in regards to sizes . For example my 6 turn will run at 24000 revs almost from stand still unlessI use the throttle very spareing . Even the 24 turn motors run at 19000 to 21000 revs So where do I start or do I get shot of the lot . A final thought is I,m about to build a 1/12 Scale lifeboat so any use there .Any thoughts appreciated
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17 July 2012 at 20:45 #3876
mike farrell
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@mikefarrell21522
18 July 2012 at 08:05 #35311
ashley needham
Participant
@ashleyneedham69188
Mike .. rule of thumb is not to use a prop larger than the can size.

HOWEVER some motors perform better than others defying this maxim.

I think that perversely, the higher power revvy motors could do with smaller props than the low power ones.

I would think for your high power items, a max or 35mm in three blade brass or "S" pitch two blade, or 40mm plastic three blade (as they usually do not have much pitch on them), and up to 40mm brass for the low power ones. However I would do a current reading just to check.

The lower power motors will usually turn a slightly larger prop with a bit of overloading, but as the current draw is not high to start with, the motor is comfortable drawing a bit extra.

Case in point the humble 385 motor, (400 size can) which will easily spin a 40mm brass prop even on 12v and does not complain (obviously with not much power) .

Ashley
18 July 2012 at 09:30 #35314
Dave Milbourn
Participant
@davemilbourn48782
MIke
From a purely practical point of view you have little of any use there. I would keep the 24 turn motors for possible use with a gearbox or reducing belt/pulley drive, and get rid of the rest (unless you're into ritual motor and ESC abuse). These very fast motors are all designed for gearing down, either in drills or model cars. They also shouldn't be run on more than about 7.2v, especially if they have plain shaft bearings.
A 1/12 scale lifeboat needs much larger motors e.g. Speed 900BB Turbo or brushless.
Dave M
18 July 2012 at 15:27 #35318
Paul T
Participant
@pault84577
Mike

Dave M is right as you will need larger motors for the lifeboat, I run my Trent on a pair of geared Johnson 600s and they are slightly underpowered.

The little high speed motors are next to useless.

Paul
18 July 2012 at 20:45 #35322
mike farrell
Participant
@mikefarrell21522
Thanks to Ashley,Dave,and Paul for the advise .I will take advise and get rid of most of the motors(I,ll take a trip to the local racing club and donate the motors to a deserving cause) Still not sure which company to buy the lifeboat kit from so back to the internet to find the best priced and most complete kit
18 July 2012 at 22:10 #35325
Andy Hustler
Participant
@andyhustler32076
Ashley as per mikes mesage i find my self with 10 A260-30 16,300 rpm 1.5- 3 volt @ 3 volts and 3 x A260-22 1.5- 4.5 volt 6,550 rpm @ 3 volts . The question is what can i use these on or in ???? if any one has any ideas i would be most grateful
19 July 2012 at 08:23 #35329
ashley needham
Participant
@ashleyneedham69188
Andy. Motorising plastic kits, or….something else, like the Argos battleship that I converted (Argos currently do an aircraft carrier..) Small airboat (you can get push on shaft small props)

Think laterally.. Ashley
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