how many rpms (55t 6cell nimh)

[nd4spdbh]

OK im thinking of going brushless and was wondering about how many rpms a 55t lathe motor does at 7.2ish volts. I had an integy 55t for 3 yrs and the comm finally wore out haha.

Thanks
Ben

[JohnRobHolmes]

Somewhere around 850 to 1000rpm/volt unloaded. Depends on many factors of the motor and timing.

[nd4spdbh]

ok thats what i figured... i had my integy 55t with the endbell adanced ~10* on my crawler... one of these

http://integy.com/cgi-bin/webc.cgi/s...d=561&p_catid=

and a friends crawler with the same gearing with a integy 55t from RCP...

http://rcpcrawlers.com/product.php?p...8&cat=9&page=1


and its a decent ammount slower.

But with the info you gave me i think i have found my brushless... its the same size as the CrawlerMaster and 1290KV and an outrunner.

[Spot(T)]

I'm a newbie in the crawler section but I have been running touring (and stadium truck) since last century and I thought that would hurt the motor if one runs it backwards with timeing other than 0°.
Could someone set me strait.

Yours
Spot(T)

[Grizzly4x4]

Originally Posted by Spot(T)

I'm a newbie in the crawler section but I have been running touring (and stadium truck) since last century and I thought that would hurt the motor if one runs it backwards with timeing other than 0°.
Could someone set me strait.

Yours
Spot(T)

You are correct. It is definitely not recommended, even in the crawler world.

[nd4spdbh]

really what would be wrong with say putting the endbell to -10* timing... then flopping the power leads?

[JohnRobHolmes]

As long as the timing is advanced the right way, it wont hurt anything. You will have more brush wear in reverse, but less in forward locomotion with about 7 degrees of timing. You will also have less power in reverse. I tend to keep mine timed at 0 for best all around performance.

[Grizzly4x4]

Originally Posted by nd4spdbh

really what would be wrong with say putting the endbell to -10* timing... then flopping the power leads?

I believe you have to rotate the endbell 180 degrees and then set it to 10* advance. I don't mess with timing so I don't know exactly why you can't set it to -10* and then flop the power leads.

I just know that flopping the power leads on a motor with timing advance makes it work harder to make the same power and can damage it in time.

Here's some explanation in this thread.

[JohnRobHolmes]

rotating the can 170 degrees would have the same effect as 10* neg timing and reversing the power leads.

Mostly you just want to make sure it spins faster in forward than in reverse.

[Grizzly4x4]

Originally Posted by JohnRobHolmes

rotating the can 170 degrees would have the same effect as 10* neg timing and reversing the power leads.

Mostly you just want to make sure it spins faster in forward than in reverse.

Gotcha, thanks John. I never did much racing so I never got into tuning motors. It never made sense why 170* should be different than -10*, now I know.