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Thank you for trying to help but sadly no they are different, you can buy cables for the 225 they have a square drive on both ends I have one here that my local shop supplied in error it is 1/8" diameter with a 1/10" square drive on each end. The cable I am looking for seems like it would be...

Does anyone have one of these Dremel 732 motor flexible drive units? If so is it possible someone could give me the details of the flexible drive inner core. This part is no longer available and is missing totally from my Dremel. I see no reason why I can't make one if I can find the details of...

In my original idle speculation I hadn't even thought about single or double acting or how the crank throws would be set up. It seems building it as a cross compound would be the way to go to simplify what is already a crazy idea. There should in this case be very little need for a receiver as...

Thanks due to circumstances I am a long way from the shop but will keep thinking about this and hope to perhaps build it one day. It was just idle speculation but it would be fun to make it real

That would seem to be by far the easiest and simplest arrangement. It would be possible to build two single throw crankshafts with bearings at each end like a normal vertical engine but gear them together in the middle. The LP crankshaft could be lower than the HP due to the longer cylinder and...

What I am idly speculating about is having a HP cylinder of 1" bore with a stroke of 1" taking steam at 100 psi and expanding about 3 times giving an exhaust of about 30 psi. I am thinking of having a LP cylinder also having a bore of 1" but a stroke of 3" taking the exhaust steam at about 30...

Yes this is true but the stroke in this case is 3 times longer hence the torque on the crankshaft is 3 times greater which SHOULD result in the same force as bigger piston with shorter stroke. No idea if it actually would work like that.

The cushioning effect is more to do with the timing of the exhaust valve so that the residual steam in the clearance volume is compressed meaning less live steam is needed to fill the clearance volume at the start of the new stroke.

Maybe it would be possible to build a multi expansion engine with both the bore and stroke maintaining the same ratio as the pressure drops. The example shows the cylinders volume increasing approximately 3 times at each stage. Such an engine is certainly going to look odd. HP 1" x 1" IP 1...

Piston speed by itself could certainly be a problem and could certainly not be extended to a triple or more expansion engine. I don't think the LP piston would draw a vacuum as the cylinder volume is pretty much exactly the same as in a normal compound. So the volume and rate of steam flow...

Clearance volume is basically dead space. You have to fill it with steam before you start to put pressure on the piston. At the end of the exhaust stroke the clearance volume is at best full of cold steam / water which cools down the in coming steam for the next power stroke. For efficiency...

Just an idle thought about compounds. If I built an engine having 1" and 1.75" cylinders with a 1" stroke I would have a pretty normal compound engine expanding steam about 3 times in each cylinder. What would happen if I built an engine with HP 1" bore x 1" stroke, LP 1" bore x 3" stroke...

Isn't it an internal combustion engine with disposable pistons?

I did briefly work on a paddle steamer where the simpling valve simply turned full boiler pressure onto the LP valve chest and diverted the HP exhaust up the stack. I don't think this is usual though.

My guestimated inlet pressures are:- HP 2500 PSI 1st IM 833 PSI 2nd IM 269 3rd IM 92 PSI LP 31 PSI Condenser inlet 10 PSI absolute. With these pressures I don't think they would be using any sort of a slide valve balanced or otherwise at least on the first 3 cylinders. I would be very curios...

There is partly described in "Audel's" engineering encyclopedia. Exact name and publication date forgotten a single acting quintuple expansion engine as I recall the HP piston was 1" diam and the LP was 8.5" with an inlet pressure of something like 2,500 PSI. I have no idea if it was ever built...

So sorry to hear this John, I haven't posted much over the years but always read your stuff.

http://www.rcuniverse.com/forum/gas-engines-142/11629052-super-morton-m5-bruce-satra.html Last post on this list was a month ago, they are looking for people interested in building this engine and they have the molds and tooling so MAY be able to help with cylinder castings. Worth asking them...

My break even price is about £20 / hour and there will be lots of hours in that job + material + freight. I can't at present guess at the time required as although I have made plenty of complicated things I have never made anything like that cylinder so for me it would be a make it and see...

That is where the bits of 14 and 16mm came from I can't find anyone locally who uses the nominal half inch though. Looks like I might have to keep turning them down to size.