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Thanks for sharing – it’s an interesting read. However, it’s getting to the point where soon the author will potentially start losing income because the key parts of the text are available for free here. Even if not, there’s a principle involved here. It’s great reading, but that’s the point – it was undoubtedly a lot of work, and if it was mine I wouldn’t be to happy to see it literally devalued.

It is maybe time to give your thoughts on all of this, and more in the spirit of a dicussion forum?

Don’t suppose you’re up for Hamilton/de H propeller blades, are you? Four ft nine, 10 inches at the widest, we can suply the CAD.. I’ve just seen your PM, I’ll see what I can get together.

P and P, you blokes should talk.

Indeed. Mark, the thing is there is no spare money in the non-flying scene. Unlike the world of rich boy’s toys, those requiring accurate parts for non-airworthy projects are not known for swimming in cash (anyone with any desire to stay or become rich wouldn’t get involved with aeroplanes that don’t fly to begin with).

So, the upshot will be that if you are only looking to keep work ticking over on commissions from this area you probably can, while covering your costs, but if you want it to show up on the annual balance sheet as a clear profit-making part of core business you might need to charge more than is in the pockets (or project funds) of most of us.

It does come down to your rates, as Sopwith said..

Fair enough. Have you ever seen it written M/M in this application before – perhaps before metric units were more familiar?

Why did whoever replaced the face write mm as M/M? It is a basic error for someone involved in instrument making – and it is repeated on the back. Still not convinced it’s not something per something.

What is the range of an ASI in terms of differential pressure?

If you can get a copy – P-38 Lightning by Warren M. Bodie, widewing Publications, 2001 – 276 pages of unsurpassed detail. Bodie had unique access to the Lockheed archive just before it was locked away in the ‘Iron Mountain’ secure storage and shredding facility (yes, really http://www.ironmountain.com/ is who you ask for Lockheed records now. They will say no).

Edit:

https://www.amazon.co.uk/Lockheed-P-38-Lightning-Warren-Bodie/dp/096293…

There’s a naughty version in pdf out there on the web somewhere.