[modeleng] Re: Tall Tales?
- From: "Andy A" <AndyA@xxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Fri, 4 Mar 2005 10:08:52 -0000
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.
There are some amazing forces setup in the valve gear of an engine capable
of serious destruction. 'Bibby Line' famously destroyed 'Crewkerne' station
canopy when it fractured its center driving axle at 70-80mph although the
theory is that it was parts of flying brake gear that did the damage, the
coupling rods amazingly remained intact although severely bent. The
Britannia's also were famous for braking coupling rods. That was attributed
to the hollow axle ends which were plugged but the rods were changed from
fluted to fish bellied I believe as a result.
Andy
----- Original Message -----
From: "Roger" <roger.g3tdm@xxxxxxxxxx>
To: "Model Engineering List - Latest" <modeleng@xxxxxxxxxxxxx>
Sent: Friday, March 04, 2005 9:30 AM
Subject: [modeleng] Tall Tales?
Hi,
I was at the local model engineering club meeting last night (that
has got model engineering into the posting!). I was chatting to one
chap who was telling me a couple of stories which I think need some
clarification - anyone out there help me?
Tale 1.
It seems that one of the larger restored full-sized locos was
working hard pulling a train up Shap when a 'core plug' "came out".
Apparently it found its way into the cylinder and totalled a cylinder
and piston.
Are there such things as 'core plugs' in old locos? If there
are, would they be positioned such that they could find their way into
the cylinder and what are they like - similar to ones in a car engine?
Tale 2.
Another restored full-sized loco was starting a train (out of a
station?). It lost its feet and the driver did not shut the regulator
quick enough. The engine over speeded and destroyed the valve gear
(due to excess speed).
Is this likely? Surely the engine wouldn't speed any more than
when going at full speed along a straight track?
What do the members of this list think is the true version of these
tales? Any ideas which engines were involved?
Cheers,
Roger Mason, in St. Agnes, which is dull, cold, and damp.
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