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(ET) Thanks and a question about timing



first, I'd like to thank the fellas that are sharing their knowledge with 
neophytes about electric vehicle design and Elec-Traks,, I'm getting a 
real 
education following the messages since I joined a few weeks ago,,,it's too 
bad that 
this field (ET's) hasn't taken off and has been discontinued by one of the 
worlds largest corporations and an Electric specialist at that...I plan to 
look 
at a few GE ET's (E15,E20) in the nearby future to use for tractor shows, 
chores, a tow tractor for my ICE pullers and maybe even as a tractor 
puller with 
controller/motor upgrades,,,,however my main interest in E tractors at the 
moment is to build a kickass exibition Pro style electric powered pulling 
tractor 
based on a Cub Cadet garden tractor chassis with somewhere between 
60-72-96 
Volts using Oddysey AGM batteries and a D&D 10 or 12 hp. motor,, (so far I 
only 
have a name for it "Quiet Riot" and a pulling chassis) as no one has done 
this 
before to my knowledge all this talk about contollers and battery packs 
and 
motors is helping me alot to understand how it all goes together,, this 
group 
is much easier to keep up with than the EV group,,,I'm finding it's 
difficult 
comparing electrics with ICE when trying to put together the proper mix of 
components and gearing to compete successfully against 70 hp. 
engines...I'm 
"currently" (pun intended) freakin out about the "science" of selecting 
and charging 
battery packs, was hoping for a "plug and play" kinda thing, lol, I can 
see 
why EV's  never caught on with the general public with all the complexity 
involved...anyway,,,there was mention earlier of "brush timing" and a 
neutral 
setting for my application,, can someone enlighten me as to what this is 
and how it 
works or point me in the right direction ??? Thanks again...Geo