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Aug 16, 2017

Stuart D10 steam passages and efficient running.


I am slowly building a D10 and want to fit steam passages like the cast in ones found on larger Stuarts like say No4. To do this the valve side of the cylinder would have to be built up in stages so the passages could be milled to shape. If built in cast iron, what is the replacement glue to replace the strange concoction they used for this sort of thing in the past (was it Cascomite?) some sort of unobtainable white lead derived paste that if it actually had a COSH sheet, would be many pages long and contain the word Death quite often.

While constructing this layered system, more room could be provided in the cylinder casting for bolting the parts together if the exhaust passage was binned in favour of an exit straight out of the valve chest by using a balanced slide valve.

Feel free to condemn these ideas as the ravings of a lunatic, but surely it is this sort of stuff that the guy you featured in a video a while back that had a small D10 powered loco in those efficiency trialsmust have implemented in his design, or at least have checked out

So, what about diversifying into videos detailing these more complex little nuances that no one ever seems to visit, or did just answer the reason why you wouldn't in that sentence!

Perhaps someone has already done all this and proved it a waste of time?

Anyone know?

Rog, Sutton Coldfield


Charlotte Appleton
Aug 18, 2017

Hi Rog,


Thanks for posting! Dad does think it's a waste of time though and he suggests just drilling the ports as shown on the drawings.



Gerald Gardiner
Aug 18, 2017

the fellows who build model gas engines will quite often polish the ports, as to whether this would be effective with steam in a D10 is anyone's guess.

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