Another one for the brains trust after another wet weekend.
I was looking at the equations for flywheel weight for steam engines.
If the same equations hole for scale models then the flywheel would
have inadequate mass for smooth motion of a model running at original
speed and the model would have to run faster - e.g. 12 times faster
for a 12th scale model, or the motion would be jerky or stop.
But then I started to think about bearings. The mass of a 12th scale
model is reduced by 12 X 12 X 12, the bearing area is reduced by 12 X
12. So the bearing area on the model is 12 times larger than is
actually needed to support the mass (good), but that means 12 times
the viscous drag, and if the model is running 12 times faster too,
then 144 times the viscous drag.
And then I started to think about flyball governors ....er.... and
rapidly decided to give up and ask the newsgroup if there have been
any ME articles or books published on the problems of scale? Its
fairly fundamental stuff that must have effected everyone making scale
models - but I don't think I have ever seen a nice clear article on
15 years ago