06-15-2018, 10:44 AM
I think Bachmann changed the design of the drive during the last years.
Old: I got a bunch of Bachmann's GE 70 tons when I planned to do Modesto & Empire inspired layout. All those drive were awfully loud and I cancelled the project. At that time run the motor axis straight to the trucks. The worm gear on the fixed installed motor axis drove the top tooth wheel. The flexibility of the truck "happened" between worm gear and top tooth wheel.
New: The GE 70 ton I got last week and you see on the photos and the video has (very small) cardan shaft like "all" other HO diesel engines. The worm gear is fixed mounted in bearing on top of the trucks. the flexibility "happens" in the cardan shaft as we are used to it. basically the same design as Bachmann uses it on the 45 ton model.
I think that is the key to the better drive performance. Anyhow the shell is still a great amplifier of all drive vibrations. The three layers of lead under the hood helped a lot.
Old: I got a bunch of Bachmann's GE 70 tons when I planned to do Modesto & Empire inspired layout. All those drive were awfully loud and I cancelled the project. At that time run the motor axis straight to the trucks. The worm gear on the fixed installed motor axis drove the top tooth wheel. The flexibility of the truck "happened" between worm gear and top tooth wheel.
New: The GE 70 ton I got last week and you see on the photos and the video has (very small) cardan shaft like "all" other HO diesel engines. The worm gear is fixed mounted in bearing on top of the trucks. the flexibility "happens" in the cardan shaft as we are used to it. basically the same design as Bachmann uses it on the 45 ton model.
I think that is the key to the better drive performance. Anyhow the shell is still a great amplifier of all drive vibrations. The three layers of lead under the hood helped a lot.
Reinhard