Zblj, on 07 February 2012 - 03:45 PM, said:
I belive the tan axle is a new part with a stop and I think its also used where the differential gears drive the 12 and 20 tooth gears to stop the axles from falling out.
Yes, I think it might be a 4M axle with 1M, a bezel and 3M. Otherwise it would be too similar to the 5.5M one.
I suspect there is an axle extender inside the dark bley bracket, and either a 2M axle into the motor (orange bit as M-motor) or the motor has a protruding 1M axle (leaving more space for internal gearing). This arrangement would carry high torque better than a twistable axle alone.
Comparing motor case sizes, I wonder whether the L-motor is a repackaged 5292 motor.
Chop off the extra gearing and fixing holes and the 5292 motor would look like a 3x4x5 package with plenty of torque.
Remove the dark bley bracket from the L-motor and it is a 3x4x5 package with plenty of torque.
(If it did not have plenty of torque then TLG would not have used it to drive the wheels of a large vehicle, or would have used the M-motor instead).
Maybe the 4 12:20 gear stages and 20:28 differential ratio provide a similar overall ratio to the gearing inside the 5292 motor.
The 5292 motor was good for RC buggies but awkward to use with large Technic wheels or standard drivetrain structures (now including the Unimog structure), so a new case on this sort of motor would make sense.
Of course 2 separate engines on the 2 axles is not a road-legal configuration in the UK, but it might be OK for off-roading, depending on the event rules. Some RC cars have a toothed belt between the two axles, but they have more powerful motors where the heat from 40 Amps can be dissipated. The vehicle body of an RC car is also lighter. I would rather have the LEGO body parts (which are better this year, being more aerodynamic) than a single-piece moulded top.