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I think you and the elves deserve a real gut busting slap up lunch.
Quote....'I have a DVD of Marion shovels in use .......they would rather waste a little steam than crack a cylinder' Chris.....do you mean over powered?, or being used [at speed] beyond their design?................[or slamming the engine into reverse prior to achieving a stationary rotation or moment?]We see so many examples [in model engineering] of Stephensons reversing gear being thrust into reverse prior to engine the engine rotation is at rest[I am uning a pair of servo slowdowns....the 1st to slow the speed of the throttle speed to zero, then the second slow down the reversing motion....as common RC servos rotate at 60 degrees in say 0.2 seconds which is totally unrealistic as we are looking more for near 10x fold of that rotational speed]Derek
Phone companies - and cable/ satellite / fibre optic TV companies - hopeless everywhere, it seems......... Enjoy the movie! (don't forget the body armour in case the elves' popcorn fights escalate to frozen 6 oz wads of un-popped kernels in ice, fired from miniature trebuchets, again...)