Brushless Dyno Plots
 

Hi Folks,

After success with a Robitronic pro master dyno to analyze brushless systems, I thought it would be good idea to pool our information.

Here is a brief explanation how I operate my dyno with a brushless setup.

1. Install brushless motor into dyno as you would a brushed one.
2. Connect a brushless ESC to the motor.
3. Connect ESC to Receiver as you would if it were in a car.
4. Connect 4.8-6v supply to one port of receiver(I use 4 cell 150mah battery pack)
5. Connect Power Output from dyno to main battery input of the ESC
6. Turn on transmitter.
7. Apply full throttle on transmitter at the same time as starting dyno test routine.
8. Upload plot to the Internet and post results here :).

This method tests ESC as well as the motor. By using the same motor different ESC can be compared.

Here as some comparison that I think many racers would love to see:

Various ROAR spec motors

eg, 10.5, 13.5 & 17.5

Brushless - Brushed

10.5 - 19t
13.5 - 19t & 27t
17.5 - 27t
21.5 - Silvercan

Various ESC.

Novak GTB/XBR, Speedpassion, GM, Tekin etc

Efficiency of low wind motors for use in 5 cell modified racing

eg. 2.5 - 4.5 turns.

If anyone is generous enough to post dyno plots could they please add text of various data incase we lose the picture.

Regards,

Jevon

I'll get the ball rolling, well hopefull it will roll :)

Dyno - Robitronic Promaster
ESC - Novak GTB (not 2.4ghz)
Motor - Novak ss4300 (10.5 turns)
Rotor - Novak Sintered 12.3mm
Voltage - 7.2

Max Power = 178.2W @ 11765rpm / 73.2% EF / 144.6Nmm
Efficiency = 95.8% @ 21619rpm / 88.6W / 39.1Nmm

http://farm3.static.flickr.com/2367/...39dfca5b_o.jpg

Orion 10.5 + GTB

http://farm3.static.flickr.com/2055/...39b954df_o.jpg

Novak SS10.5 Pro + GTB

http://farm3.static.flickr.com/2085/...925a316e_o.jpg

The novak is a friends and it's better than my ss4300. I suspect it has a stronger rotor to explain the extra torque. I tested another friends ss10.5 pro and it had a little less torque and a 1k more max rpm.

The Orion peak power is very close but peak efficiency is 8% lower.

Dear JevUK,
Сould you please to indicate the average power over the 20-80A range on yours plots?

Mod classes
 

Jevon, thanks for the good work /idea.

I speak for 2 RC Clubs, one in Austria and another in Portugal.

There are a lot of discussions between the performance of the 4,5 T from SPassion and LRP/Nosram, so as between the ESC from the same brands.

Could you bring some light into this ?

I know very well Robert ( the owner of Robitronic) and when there are some more tests here, I will gladly invite him for a "TOUR".

thanks anyway

Pedro

Can anyone try a Mamba Max 5700 with 11.1V? :D

I tested a friends orginal LRP Sphere esc against my spare novak. I didn't have alot of time and only a Novak 6.5 with bonded rotor to hand.

Sphere = 196 watts @ 21.3k rpm, 87.1% efficiency @ 34.5k rpm

http://farm3.static.flickr.com/2338/...c323ed7c_o.jpg

GTB = 210 watts @ 20.7k rpm, 92.5% efficiency @ 34.5k rpm

http://farm3.static.flickr.com/2098/...e8170864_o.jpg

There may have been a problem with the sphere running this motor. The bonded rotor is past it's best so could explain it. If I get another chance I will test with a sintered rotor.

Hi Pedro

Thanks for your appreciation.

That's is cool that you know Robert, next time you speak I would be very grateful if you could ask him a question. Is it still possible to register the dyno software?. I had no reply from the email address.

I would be very wary of testing a 4.5t motor due to the high current and rpm. When I tested the 6.5 it was a little scary, it would be nice if the motor manufactures would tell us max rpm of each type of rotor.

I hope to compare other esc and spec wind motors in the future.

Regards, Jevon

Very interesting. I've heard the sphere advances timing on the motors slightly, giving more power. Didn't show that way on the graphs, though. I'd love to see it with new equipment.

Thanks for your work Jev, and keep it up.

Good thing I sold my TD45, or I'd be obsessing over this!

BTW, I went and di a little search for 19T dyno results here. that 10.5 looks almost identical to a 19T

StephenSobottka
Moderator

Franklin,WI
2,963 Posts Since Jul 2002
Trader Rating: 1 (100%+) 04-30-2003, 11:51 PM
Report | Post #15


I run a chameleon 2 pro. I have done some tweaking to it to make it a little better all around
SETUP
red on pos
green on neg
Axiom 12% full face both sides
teflon shims

ROBI RESULTS

34,211 rpm
178.2 watts
76.2% eff
227 nmm torque
~~Stephen Sobottka~~ Team Kwik, Novak Electronics, Protoform, Parma PSE, Sobottka Racing Developments, Greenfield News and Hobby, Schacht Paintwerks, Team Duct It!,

http://www.rctech.net/forum/showthre...light=19T+Dyno

The torque figures for the brushless will be somewhat generous because I did not change the inertia settings. I don't see the point of guessing the correct figures so these graphs are only directly comparable if the rotors are the same.

If anyone can give me the correct inertia settings for the different brushless rotors I would be very happy :).

A rough extrapolation of the 10.5's torque curve would give around 300Nmm at 0 rpm . This Dyno does not test at low rpm's. But other than that the 19t dyno results is just like what we have found on the track, a very close and lucky match :).

I gave the laptop away to my sisters so I don't have anything save results at the track with. I will try to get single stored results of systems I can compare with when I get back home. At least I think the dyno can store a single test and then upload it when I get home.

You haven't heard the last of me on this thread :D

Do they still sell these dynos?


I would like to investigate and test Novak vs Speedpassion vs LRP speedos, and the different motors.

I don't think robitronic sell dyno's anymore but there are plenty of other brands. Keep an eye on ebay ;).

Hey JevUK,
I just bought a Robi as well as a TurboDyno 45 just for testing Brushless stuff so once I get setup I can start posting stuff. I have a couple questions for you on the Robi. First, were there two versions the Pro-Master and Pro-Master II? And if so do you know if I can still get recalibrations or upgrades for them?

Thanks,
Frank

Hi Frank, that's cool that you've got both. You can compare how well each one deals with brushless.

I don't know the difference between the I and the II, might just be the amp limit or firmware. Afaik there is only one version of the PC software.

I did send an email to the address on robi's website to register the software but no reply so far. I will try sending an email their main address.

I'm not sure which version I have but assume it's the "I" as there's no "II" on it anywhere.

Any new pulls?
 

Jev,
Have you done any more pulls? I'm just waiting on a PS for my TD45 to start work. So far I have a GTB, GTBSS, XBR and Super Sport with Novak 4.5, 6.5, 7.5, 8.5, 10.5, 13.5 and 17.5 to work with. I've also got several different rotors and an LCR meter to work with so hopefully I can find something interesting.