well heres my .....this pic shows the rear drive set of a PRR DD1 quartered around 90 degrees....is ths typical?? dunno.....but you can see the counterweight of the rear drive shaft is off about 90 from one side to the other...i would assume the front set is the same....
The drivers are quartered and cross-balanced to minimize asymmetrical stress on the frame. Quartering to balance piston thrust isn't necessary in a siderod electric, but the dynamic augment of reciprocating weight is still there. And, if the rods were set at zero or 180 degree offset, the rods wouldn't be able to transmit rotary motion from the motor to the wheels.
Chuck
tomikawaTT wrote:the dynamic augment of reciprocating weight is still there[in a siderod electric]
What reciprocating weight?
DD1 wrote: I think my question has been answered.
One guy answered yes, the other one answered no. Which one did you choose?
I think the concensus indicates the drivers are quartered and that's what I'm going with. I will post pictures of the finished engine at a later date. For now, progress is slow as I have to reinvent the wheel as I go. Here is a foto of the engine I'm building.
timz wrote: tomikawaTT wrote:the dynamic augment of reciprocating weight is still there[in a siderod electric]What reciprocating weight?
Looking at one side of the locomotive only, the weight of the siderod and main rod cannot be fully counterbalanced (the main driver wheel weight can't be made big enough.) The effect is more noticeable in the horizontal plane, and is offset either by having pilot wheels (as in the DD-1) or by having a longer rigid wheelbase.
tomikawaTT wrote:the weight of the siderod and main rod cannot be fully counterbalanced (the main driver wheel weight can't be made big enough.)
You agree the counterweight could have been bigger than it was? (On the DD1, anyway.) So why didn't they make it bigger, if more was needed? We've all seen pics of semicircular counterweights.
And no reciprocating weight-- right?
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