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21.5 motor

Old 08-01-2018, 09:01 PM
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Default 21.5 motor

Want to know who makes the highest rpm 21.5 motor? Does SMC motor any good?
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Old 08-01-2018, 10:31 PM
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I'd buy an R1 with the 12.3 rotor option.
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Old 08-02-2018, 01:17 PM
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Current R1’s and even a tuned V11 R1 with good bearings and aluminum/titanium screws flat out fly. By far the fastest motors I’ve had for a USGT car although I haven’t tried them all. The numbers I see with an analyzer are equal so quiet a few 17.5’s from just a generation ago.
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Old 08-02-2018, 01:53 PM
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If you want just the highest RPM 21.5t motor, then you'll need to get a Muchmore Fleta ZX v2 21.5t ER with all aluminum screws, full ceramic bearings, and their titanium rotor option(12.0mm).... No other motor can get a higher rpm value on an analyzer, period !!!
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Old 08-07-2018, 09:33 AM
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Originally Posted by slodsm View Post
Current R1ís and even a tuned V11 R1 with good bearings and aluminum/titanium screws flat out fly. By far the fastest motors Iíve had for a USGT car although I havenít tried them all. The numbers I see with an analyzer are equal so quiet a few 17.5ís from just a generation ago.
Originally Posted by bertrandsv87 View Post
If you want just the highest RPM 21.5t motor, then you'll need to get a Muchmore Fleta ZX v2 21.5t ER with all aluminum screws, full ceramic bearings, and their titanium rotor option(12.0mm).... No other motor can get a higher rpm value on an analyzer, period !!!

hmmm...
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Old 08-07-2018, 01:41 PM
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Originally Posted by phatboislim View Post
hmmm...
R1 also has a 12.0 rotors, however 12.0 rotors are used exclusively in modified motors. Don't go lower than 12.3 for stock.
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Old 08-07-2018, 01:51 PM
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Trinity Monster Max!!!!!!!!
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Old 08-07-2018, 02:30 PM
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Originally Posted by tbrymer View Post
R1 also has a 12.0 rotors, however 12.0 rotors are used exclusively in modified motors. Don't go lower than 12.3 for stock.
I have run 12.0 rotors in R1 21.5 motors without issue. I'd say its a toss up which combo works better between the 12.0 and the 12.3.
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Old 08-08-2018, 09:03 PM
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Originally Posted by Johnny Wishbone View Post
I have run 12.0 rotors in R1 21.5 motors without issue. I'd say its a toss up which combo works better between the 12.0 and the 12.3.
Yeah, definitely depends on his application.
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Old 08-08-2018, 09:48 PM
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Keep in mind a 12.0 rotor would probably not be legal if racing at a sanctioned event.
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Old 08-08-2018, 11:43 PM
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Originally Posted by nexxus View Post
Keep in mind a 12.0 rotor would probably not be legal if racing at a sanctioned event.
Are you saying that there is a minimum rotor diameter in the rules ???
Muchmore makes a titanium 12.0mm rotor with a 7.25mm shaft that should be legal for spec racing in the tracks that allow tuning spec rotors: we all know the 'rotor that came with the motor' rule is unenforceable....
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Old 08-09-2018, 12:24 AM
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Originally Posted by bertrandsv87 View Post
Are you saying that there is a minimum rotor diameter in the rules ???
Muchmore makes a titanium 12.0mm rotor with a 7.25mm shaft that should be legal for spec racing in the tracks that allow tuning spec rotors: we all know the 'rotor that came with the motor' rule is unenforceable....
If this part is true:
Originally Posted by tbrymer View Post
R1 also has a 12.0 rotors, however 12.0 rotors are used exclusively in modified motors. Don't go lower than 12.3 for stock.
Then it probably isn't legal. If you're sure Muchmore makes such a rotor and it's approved for a particular stock motor, then it's probably fine.
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Old 08-09-2018, 04:43 AM
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8.4.7.2.6 ROAR Spec 21.5 motor: The three slotted stator must be wound with 21.5 turns of two strands of a maximum diameter of 0.724mm per slot. No motor will be approved with resistance less than 54.6 milliohms* between any 2 phases of the motor (AB, AC, BC), when measured at 25C with an Instek GOM 802 milliohm meter.

8.4.5 Optional Rotors – approval and use
8.4.5.1 Motor Manufacturers are offering optional or tuning rotors for brushless motors. Many of these rotors may not be approved products for use in ROAR sanctioned events. The only rotors ROAR Approved for any BL motor are the one(s) submitted during the original motor approval process. Importers/Manufacturers may include any Option/Tuning Rotors for inspection and listing, when motor samples are submitted, or they can submit at a later date for inclusion.
Revised October 31, 2017

8.4.5.2 Affiliate Importers / Manufacturers who have developed Option / Tuning Rotors and wish to add them for use in their Spec Wind motors, should contact ROAR and the Motor Lab immediately to have these items considered for approval. The Motor Lab will require 3 rotors and a list of the winds in which they are being offered. Each rotor must include the appropriate part number of the tuning and original rotor.
8.4.5.3 For our Members using Tuning Rotors be advised, ROAR Technical Inspection Team will treat Rotor Inspection as a serious part of race inspection at the nationals and all of the technical data from the original Motor/Rotor Submissions is cataloged. The Inspection Team has and will continue to deny the use of non-approved "option" rotors at ROAR Nationals because they have not been submitted for inspection by the Manufacturer.

Spec 21.5 Motors
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Old 08-09-2018, 09:13 AM
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Originally Posted by DARKSIDE View Post
8.4.5.3 For our Members using Tuning Rotors be advised, ROAR Technical Inspection Team will treat Rotor Inspection as a serious part of race inspection at the nationals and all of the technical data from the original Motor/Rotor Submissions is cataloged. The Inspection Team has and will continue to deny the use of non-approved "option" rotors at ROAR Nationals because they have not been submitted for inspection by the Manufacturer.
Not sure what the call on this would be then. (This is R1 specific from ROAR posting)

"Can also use R1 125-720-003, 123-720-001, 123-720-259 and other approved R1 rotors."

I guess if playing with rotors is your deal, just be aware that there are rules about what you can and can't use.
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Old 08-09-2018, 06:02 PM
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Originally Posted by bertrandsv87 View Post
Are you saying that there is a minimum rotor diameter in the rules ???
Muchmore makes a titanium 12.0mm rotor with a 7.25mm shaft that should be legal for spec racing in the tracks that allow tuning spec rotors: we all know the 'rotor that came with the motor' rule is unenforceable....
I am saying if you choose to run at a sanctioned event, you should familiarize yourself with the rules for the class you intend to run. Whether something "should be legal" is irrelevant, the rules state what is and what isn't. If you don't agree with the rules, that's fine, there's no obligation for you to participate.

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