First let me say I do not race brushless but I have raced brushed for many many years. I now run Nitro-Pan. But I must admit I am curious about the brushless/lipo combos. Time will tell.

On to my wondering.

IF you took a B/L ESC, connected it to a signal generator that provided full throttle to the ESC. Then took the ESC and connected the supply side to the output of the Fantom Dyno, connected the proper leads to the motor, wouldn't this effectivley "dyno" the motor? It would measure amp draw, RPM and calculate torque.

Hmmmm, maybe I should not have said anything. All this talk of "gadgets" and what not has gotten me to pondering.

Anyone try this yet?

Maybe I will come out with an adapter for the Dynos.

What 'cha think?

I have dynoed a 10.5 brushless motor on my fantom dyno, The only difference in trying to dyno a brushless motor vs a brushed motor is that you have to hook up the motor lead off the dyno to the speedcontrol instead of directly to the motor like you would a brushed motor and use a reciever pack to turn on your speedcontrol and use your radio to deliver full throttle to the motor, the idea is when you push the F1 key to start the dyno you have to pull back the throttle trigger at the same time to get an accurate reading, if not you will have a slow wind up time and the rest of the readings will be off to. It works perfect!! I have dynoed my several times and I get the exact reading every time un like a brushed motor.

JP

I thought of that, using the transmitter.

But if you eliminated the transmitter, not only would you not risk interfering with another driver, but the "adapter" could be calibrated to deliver full throttle instantly.

One question I have is this. Can the B/L ESC's handle being in full throttle and then having the supply voltage put to them?

I thought of that, using the transmitter.

But if you eliminated the transmitter, not only would you not risk interfering with another driver, but the "adapter" could be calibrated to deliver full throttle instantly.

One question I have is this. Can the B/L ESC's handle being in full throttle and then having the supply voltage put to them? I don't know about that, but I use a spektrum system so there is no interference, plus I do it at home there would be know reason for me to take the dyno to the track since the performance of the motor does not change like a brushed motor does not enless you over heated the motor and then it went down hill.

I know the Robitronic dyno will do them.
The 4300 is a pretty stout motor. Super numbers when compared to handwound 19T's

Just thinkin' is all.

I get a kick outta making stuff work.

I'm by far not an expert on brushless motors but I am learning more every day.

I know the Robitronic dyno will do them.
The 4300 is a pretty stout motor. Super numbers when compared to handwound 19T's

Does it have a B/L motor "driver" or does it require an ESC to be put in series with the motor?

Yes the numbers are pretty stout especially the torque and eff. but the RPM that i am getting is no different than a high torque stock motor example p2k or a paradox

No, I do not mean the numbers. I mean how does the "dyno" power the motor? Do you have to add a B/L ESC?

No, I do not mean the numbers. I mean how does the "dyno" power the motor? Do you have to add a B/L ESC?
Yes you do, but I don't have a good way to explain that, just that brushless motors do not have brushes they are sesored based motors that work from the speedcontrol. somebody else might be able to explain that to you better than I can.

I understand how the brushless motors work, the differences in ESC's between the Brushed and B/L ones.

I was curious if the Robo Dyno still needed an outside ESC to ba able to dyno the B/L motors.

If you are adding the ESC, like the guy using the Fantom dyno, you are both accomplishing the same deal.

You will need a brushlesss esc to run on the Fantom and Robi.

I was going to do this w/ my TURBO DYNO - but decided to sell it and buy 3 B/L systems and 3 lipo batteries instead...

I would say - There WILL be some sort of Dyno Conversion for existing dynos...or a NEW dyno prior to Snowbirds '08

would it be possible to use the thor chassis dyno with brushless systems to check amp draw and rpms with diffrent gearings?

no the robi you still have to hookup the speedo

would it be possible to use the thor chassis dyno with brushless systems to check amp draw and rpms with diffrent gearings?

Yes, I would suggest you use a 4 cell battery and monitor voltage at battery to keep each motor you compare with another consistent. You will have to use radio and work throttle to power motor. Got any other question just give me a call.

impdog,

I have a chassis dyno deal I made for comparing my cars to others...when I tested the brushless setup on it...I got really weird results.

I'd like to hear if anyone w/ a THOR has done testing as well.

(I tested my 19t car, and it pulled the 25+ amps I thought it should based on how I set the unit up)

I tested my 10.5 car - which ran strong - and I would have figured to be really similar..and the amp load at the battery was almost 10 amps lower...I'm baffled..and thought maybe I was testing something in a different manner, so I retested both.

I then checked the AC amperage at the motor and got basically the same number...the inductive amp meter I used was ZERO'd in relative delta...

I drew one of 2 conclusions...

A) Either these B/L motors are running 30+% more efficient and less amperage..

B) Something isn't letting them test properly

...although the AXLE RPM's were both right where they should have been...

SWTour, I think, A. Think about track performance with the 4300's, you can run what feels like forever on a practice run, compared to the 19T.