@gunrunnerjohn posted:I keep a couple of the Mabuchi 550 motors on hand, they're cheap and I see a surprising number of Weaver and Williams steam with defective motors. If free-running they draw more than around 2x what the free-running 550 draws, I swap them out. I've found motors that draw several amps free-running, I expect more like 200-300 milliamps.
Correct, ….the 550’s I’ve come across are all amp hogs,…..more than likely so they can spin to oblivion because as we noted earlier in this conversation, all those Weaver/Willaims brass engines are geared to the moon,…..you give up a touch of top end speed swapping to the 555, but the trade off is it doesn’t sound like it gonna explode at any given second……those 550’s sound more like a Cessna trying to clear a runway than a model train,…..😉
Pat
