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Hi Paul, Please excuse a quick 'off topic' remark, but I'm very glad to hear there is still interest in flash steam hydroplanes. My step father was Arthur Cockman, so I have an interest there, and I well remember Sundays at Victoria Park with my father, Jack Skingley. I now live in Southern...

Many thanks for that. This has happened to me, thankfully on a non-critical piece, so I didn't bother investigating. Though it did still annoy me. But like many things, now you've pointed it out, it's obvious. :) Thanks again. Ron

Hi N, Yes I see what you mean about the arm locker :) Luckily it's on my gear changing arm not steering arm, so I just don't change gear. Keeping a log of what I'm doing when it does it's measurements too. Though not sure what the doc will make of entries like "in workshop searching for...

Hi All, This could get me going given half a chance, but I'm due at the docs to have a 24 hour blood pressure monitor fitted, so better not get worked up :) There's too much of this copyright stuff about lately. And from people like Model Engineer magazine, who are supposed to be in the...

It's nearest to 12.7 mm But if you are having problems with tools to decimals of mm, then just buy imperial ones. Or am I not understanding your problem?

It's neither, it's 1/2". Depends what your lathe and/or mill are calibrated in. But either way you still have to measure to 0.05 mm or 1 thou or so. You can't rely on tool accuracy. Even a good reamer in gunmetal will give you an undersized bore. So it really doesn't matter a lot.

Just get a digital vernia gauge. That will convert for you at the touch of a button.

There's plastic test tubes available too. Might be ideal for the displacer, and a lot cheaper and easy to cut (I assume?).

Many thanks for the info. Guess I'll order some standard I've tubes on eBay. I've a friend who does all sorts of decorative cut and fused glass, and he has cutters and grinders, so will ask him if he can cut Pyrex test tubes.

I'm just about to start building this too. Emailed Jan for the plans today. What size is the test tube? So I can order one on eBay. Ron Ireland

Many thanks for all the welcomes. Henry is progressing slowly. Currently machining the port block, but what a pain starting from a casting. Could have done a better job, quicker, from stock. But.... Live and learn :)

Hi all. I'm a 're-born' model engineer living in West Cork, Ireland. Now retired, I had a 5 year apprenticeship back in the mists of time, in the UK, and then took to electronics instead. (And a bit of software) But now I've reformed my ways, and have started on a Tubal Cain 'Henry' oscillating...