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| Block port size. Bogstandard’s Paddle Duck Engine |
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| Knock-wood:
I’m starting my first model steam engine and have decided to use the great plans from Bogstandard. I have decided to make mine a bit bigger and have doubled the size. (20mm bore X 40mm stroke) I see on the plans that the block port size is Ø 1.6mm this would appear to be a critical size as all other dimensions are to the nearest 1/2mm. I was wondering how this size is calculated? Is there a formula that uses boar and stroke to work this out? Can I simply double this 1.6mm diameter for my engine? I’ve a funny feeling it’s not that simple. |
| awemawson:
Can't help you with the port sizing, but welcome aboard the forum |
| SwarfnStuff:
Hi, just did a search on "port sizing in steam engines" and ended up here. http://www.steamautomobile.com/ForuM/read.php?1,24667 Have a look and see if it helps or confuses. I did notice some three or four posts down someone had attached a spread sheet you may wish to check. John B |
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