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[pilleya]

Originally Posted by pmangels17

I know in 2012 the Poofs had a drivetrain that had two CIM's per side and a 775 (I think it was a 775) per side as well (with 2-speeds, no less), per this source, and also from me seeing it at Champs. This seems to me like it could be the best of both worlds, and a CIM/775/775Pro hybrid opens up a ton of possibilities.

Quite a few teams have utilised the BB775-18 in conjunction with CIM's in previous seasons.

775's especially the 775pro because of the bearings, are more efficient then CIM's, so this is another advantage. I think that in a shifting gearbox, 775pro’s are highly effective alongside CIM’s or with sufficient cooling could be highly effective alone. 3360’s drivetrain utilises 8 775pro’s that is a lot of power. While the motors may not like being stalled, it is very unlikely they will be stalled in a pushing match (this is more power than 8 CIM’s).

Cooling CIM’s with a fan etc. during a match isn’t very effective, because most of the heat is contained in the rotor, in-fact the outer case of the motor continues to heat up after the match ends, because of the heat conducting from the rotor. But with 775pro’s because of the low thermal mass and the fact that they aren’t sealed means that in-match cooling can be used.

The 775pro is designed so air is drawn in through the front holes, and is then expelled out the back after it has passed around the rotor. The VP mount has special holes for this, but the holes in the the VP motor input stage, could be enlarged to increase airflow.

In the 2014 KOP there was a thing called an “ICE cube” supplied by EBMpapst which allows fan-forced cooling keeping the motor cool, even when the fan is not rotating. It looks ideal for a task like this.

http://first.ebmpapst.us/docs/Instruction_RevC.pdf

There was some discussion about it on this thread http://www.chiefdelphi.com/forums/sh...ght=775+cooler