Novaks new 17.5 brushed equivalent
11-16-2007, 09:36 AM
#17
11-16-2007, 09:43 AM
#18
There will never be a brushless equivalent to a brushed stock motor. They may have similar laps / lap times but how they get there will always be different.
However, we did extensive testing with the 17.5 motor (searching for something else) and found it was so much closer to the speeds of a STOCK motor than ANYTHING else out there.
The 13.5's with BONDED rotors were the benchmark, but once you stuffed a Sintered Rotor in them...they were not even close to stock speeds anymore. (At least if geared properly)
..as to the price comparison, I haven't seen a true $24.00 STOCK Motor in a long time...close to $35.00 on average, plus a couple EXTRA sets of Brushes, plus the cost of REPLACING the brushes every few races, plus I personally NEVER bought one STOCK motor at a time...I always bought 3 to HOPE to get one really good one...so that was OVER $100.00 just in itself. But that wasn't the debate here... it was about whether or not the 17,5 is compatible to a 27t STOCK motor. (The TRUE answer is No - NOTHING is compatible...but a 27t STOCK motor...but the 17.5 is about as CLOSE as you are ever going to find)
11-16-2007, 10:04 AM
#19
Because the sintered rotors stand up to the abuse that people put them through MUCH better than the bonded rotors do.
If you overgear/over run a motor with a bonded rotor the rotor's magnetic strength will drop off rather quickly... this will lead to a much less efficient motor ... this means higher motor temps... higher ESC temps... and eventually failure of either the ESC or the motor.
With a sintered rotor the margin for error is larger... meaning tha you're less likely to cook something because you ran it "wrong".
If you overgear/over run a motor with a bonded rotor the rotor's magnetic strength will drop off rather quickly... this will lead to a much less efficient motor ... this means higher motor temps... higher ESC temps... and eventually failure of either the ESC or the motor.
With a sintered rotor the margin for error is larger... meaning tha you're less likely to cook something because you ran it "wrong".
11-16-2007, 10:07 AM
#20
I don't understand why we allow the sintered rotors. Most seem to agree that the original bonded rotor 13.5s were a pretty good match.
It seems obvious that the brushless stock class or combined bl/brushed... should only allow bonded rotor motors. For now, that would be an immediate "fix" or at least a band-aid to the issue.
It seems obvious that the brushless stock class or combined bl/brushed... should only allow bonded rotor motors. For now, that would be an immediate "fix" or at least a band-aid to the issue.
11-16-2007, 10:15 AM
#21
cost of brushless part 2
The novak ex 13.5 system is $169. For the $169, you get a legal BL system with novak GTX performance (according to novak.)
A good brushed speed controller is: $85 (novak rooster reversible) + a good stock motor is $32. So about $120 for a brushed system vs $170 for a brushless. If the initial cost difference is $50, I think most newbies will get the BL if the differences are explained to them.
A good brushed speed controller is: $85 (novak rooster reversible) + a good stock motor is $32. So about $120 for a brushed system vs $170 for a brushless. If the initial cost difference is $50, I think most newbies will get the BL if the differences are explained to them.
11-16-2007, 10:17 AM
#23
Yeah, I just notice that...very strange!
11-16-2007, 10:30 AM
#24
Maybe It should be equal in the brushed, tamiya sport tuned "plus"(110-120%, i think).
Like Speedpassion's sensorless 15T, rs-540bl2.
Like Speedpassion's sensorless 15T, rs-540bl2.
11-16-2007, 10:36 AM
#25
The problem of comparison is exacerbated by the fact that the results are different based on what type of car you're using. For us, sedans running 13.5's look identical to 27T's in the straights, but show a bit of an advantage out of the turns. It's there, for sure, but it's not THAT big. But... a 13.5 in a 1/12th scale makes a 27T look silly by comparison.
So, making blanket statements about compatibility in terms of performance isn't really possible from one style of car to the next. You really have to say what style of racing/car you're using to tell the whole story, and try not to make conclusive comparisons between, say, 4 cell oval and 6 cell on-road.
So, making blanket statements about compatibility in terms of performance isn't really possible from one style of car to the next. You really have to say what style of racing/car you're using to tell the whole story, and try not to make conclusive comparisons between, say, 4 cell oval and 6 cell on-road.
11-16-2007, 10:57 AM
#28
The best thing about brushless is that it allows the average racer to go out and purchase enough power to get the job done...to "get on base" as it were.
13.5/17.5 I don't really care. As long as it's brushless, I'll be racing it.
11-16-2007, 11:01 AM
#29