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Old 01-26-2008, 02:51 AM   #1
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Default How many RPM's does a 16 x2 motor have?

I am new to Mod Motors & have a old 10L (pan car)... It's nice & quick, what RPM's is it likly to pulling out??? The motor is older style, made & built in 91/93 it's a twister 16 Doulbe. Thanks for the help.
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Old 01-26-2008, 07:24 AM   #2
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Default RPM's

There a many different variables to your qustion but here are some specs from a new 16 turn motor. The age of the motor the different brushes, has the comm been turned, quality of batteries but here are the specs. Hope this helps. This is from Tower Hobbies.


Designed for short and tight tracks where hi-torque and fast spool up
are a must, this is the Cobalt 2 16 Turn Double Wind Round Wire
motor from Trinity.
This motor would be a good choice for 2WD buggies.

FEATURES: Round wire armature are heavier but have smoother wider power band.
New aluminum Epic end bell.
New copper hoods and heatsink plates provide a tighter brush fit for
less brush chatter. These parts are now closer to the commutator for
better brush support and less brush wobble as the brush wears down
New Elipse Brushes with better surface area.
Motor can has been retooled for a more precision motor bearing fit
New high temperature epoxy holds the wires more secure which prevents
the wires from shifting and throwing the armature out of balance
Computerized digital balanced results in higher rpm and longer brush
and bearing life
RPM, power, efficency, and torque readings printed on side of can

INCLUDES: One motor with brushes and purple springs installed
Ships in a foam lined wood box with gold colored latch

REQUIRES: Motor leads and connectors (if using) WSDC1410 - WSDM3001

SPECS: Length: 2.22" (56mm) (not including the motor shaft)
Can diameter: 1.42 " (36.10mm)
Shaft diameter: 1/8"
Performance specs: RPM 17,603 @ 5V
Power 83W @ 9K
EFF 91.1% @ 15.6K
Torque 126.7 Nmm
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Old 01-26-2008, 06:54 PM   #3
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Default Thanks for that...

I think that the 17,200 rpm is a little low as a stock sliver can (Johnstone type motor), can pull that out & I would have to think that a 16 Double will pull out at least 29,ooo rpm's if not more like 32,ooo (or more)???

The motor is a older build (91/93) & has not been used too much. It's a Twister. Thats all I can tell ya for now. Not sure if it has been turned at all. I don't think it has. I have had it for almost all it's life (unopened by me).
Was used in one race day & then I got it.

Am I thinking rightly??? Or am I wrong??? Thanks.
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Old 01-26-2008, 09:22 PM   #4
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Originally Posted by anotherrcguy View Post
Performance specs: RPM 17,603 @ 5V
Its important to observe the things after the numbers... This example puts out 17,603 rpm AT 5 VOLTS. the mabuchi puts out about 17K rpm at 7.2v, while this motor puts out that rpm at just 5v. or at 7.2v, it puts out much more rpm.

Now, You really cannot determine RPM or Torque based purely on the motor turns and windings. Its like real car engines. Ten cars may have the same Engine Displacement, but do they have the same Torque and RPM? Not really.

Thus, its helpless trying to figure it out, unless you Dyno it. but then what benifits do you get?

Just run in Mod and have fun!
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Old 01-27-2008, 02:26 PM   #5
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Default The reason I am asking

for the Rpm's on the motor is so that I can work out what the speed is that my car is doing, have found a website that works out the speed(s), just put the spur/pinon & roll out (wheel dia), then add the RPM's & it gives you a speed that your car SHOULD be doing...

I am trying to gear the car so that it is driveable & quick & fun.

I have a old rc10L (pan car) & enjoying it so much.

Thanks to all for the help & advice all the same.
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