I got a kick out of a post about how hard it is to get MTH installs to speed match correctly. I’ve done it several times now.
The MTH PS system watches the flywheel and controls the speeds precisely. That means you don’t have to be a wizard trying to set speed parameters and speed curves to match. Here’s a quick video of an install on a USA trains running with the MTH Challenger. They match up well and can run together in a consist.
https://youtu.be/W10c9FlQkxs
That is very precise! (http://largescalecentral.com/externals/tinymce/plugins/emoticons/img/smiley-cool.gif)
Wow! When they went backward, I was looking for a wire or rod connecting them, there isn’t one. That is some precision.
print the tach strip with the right number of stripes and you can get pretty close, but the gear ratio between the motor and the axles combined with the wheel diameter is what makes the difference.
the more the motor is “geared down” the finer precision you can get by adding or removing one tach “stripe”.
I’ve never calculated the inches per rpm of various locos, but if I remember right, the gearboxes in the 3 axle USAT locos has a double reduction.
Greg
p.s. by the way, where did they put the flywheel on the USAT loco? The way their 3 axle blocks are made there’s no room for a flywheel. You can do it with Aristo trucks.
