[modeleng] Re: Tall Tales? Blue Peter>damaged motion>probably blue language as well!
- From: "R.L. Roebuck" <rlr20@xxxxxxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Fri, 4 Mar 2005 11:11:03 +0000 (GMT)
On Fri, 4 Mar 2005, Andy A wrote:
> Hi Roger
> I think someone has got some Chinese whispers here, but the facts are
> basically correct. 'Princess Lizzie' destroyed its middle cylinder when the
> center big end went causing the piston to over stroke at speed and I cant
> remember which engine it was, 'Blue Peter' rings a bell, thrashed its motion
> to pieces when it lost its feet on Shap. I believe the driver was slow in
> responding and the slip got worse leading to the destruction of the left
> hand engines motion.
I think someone said that Blue Peter's wheels slipped and they spun
equivalent to the rate they would have been going at if the loco was
travelling at over 150mph.
This may not seem much over the 126mph acheived by Mallard (which did
suffer some big end damage) but don't forget that the rotational forces
scale with speed squared - so the worst of the forces at 150mph will be
almost 50% greater than at 126mph.
Yours,
Rich.
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