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| Slowly casting up parts for a steam twin marine engine |
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| Artie:
Yeah Bernd, I do know what you are saying... som much to do ...so little time... :( Rob W.. yeah...its a little like Aus...everything is bigger..... :lol: Im at somewhat of a crossroads right now... I need the boiler to be in place to go on. While im doing this there area few other bits I can do but most is reliant upon this. Decision decisions... I have materials for both a steel and a copper boiler... so far I have swayed back and forth about 2475 times... each has its advantages and disadvantages.... Right now Im thinking copper... Mainly because I can silver solder it myself, whereas a steel unit requires a certified boiler maker to weld it. The drawn (seamless) steel tubing I have is a little too large for the engine aesthetically and the codes requirements for the construction of a copper boiler are a whole lot less onerous as this size tubing falls into the subminiature category where as the steel size is in the miniature category. The drawbacks of the copper are that it is a fairly small capacity and will require topping up for any extended periods of running unless I build the pump Edgar W, lists in his plans. I am making provision for this by building the eccentic onto the crank. It wont be accessible afterwards and I dont really want to do a split eccentic. The capacity of teh steel boiler is what is making me keep coming back to it (therefore the simplicity....ie no pump or water reservoir in the hull). However..copper it is... I think..... A couple of pics of the mock up I have been fiddling with to determine the 'looks' of the unit..... ignore the timber blocks... Copper...(verdis and all!)... the copper boiler is a little small in looks and this will allow me to put a cover over it with teh scale details added and this will also act as an insulator retaining the heat to a degree and increasing it efficiency.. Steel... Copper copper copper... Just FYI, subminiature regs require the boiler to be 75mm dia or less, 1000cc capacity or less and an operating pressure of up to 75psi. The premise is that these 'little' boilers wont have the capacity to be used in trains which can tow passengers or an engineer..therefore they wont be in extremely close proximity to persons when they explode... (thats my extrapolation.. :doh: ). Therefore they are a lot simpler to build... Cheers Rob |
| Rob.Wilson:
HI Rob :headbang: I like the arangment of the engine room , with the cylinders either side of the boiler :thumbup: , any chance of a shot of that part of the drawings ,,,,,,,,thats if it ok to do that . Will you be doing a casting for the bed plate ,to mount the cylinders and cross head guides ? :poke: :D Cheers Rob W |
| Artie:
Hi Rob, sorry for the tardy reply, been away again. Bed plate, really hadnt thought about that component yet. Have now... I was going to use the sheet in the picture to mount it all up and do the cast plate IF that wasnt satisfactory..... but..... now am thinking that the sheet has NO place in the company of so many cast or scratch built components.... cast it is... and soon....... Cheers Rob T |
| Rob.Wilson:
Hi Rob :headbang: cast bed plate would be a very nice touch , like you say you already have alot of very nice cast parts ,IMO would be a shame to mount them on a plain plate :thumbup: So whats it to be copper or steel ? :med: Regards Rob W |
| Artie:
--- Quote from: Rob.Wilson on April 29, 2010, 04:59:52 PM ---I like the arangment of the engine room , with the cylinders either side of the boiler :thumbup: , any chance of a shot of that part of the drawings ,,,,,,,,thats if it ok to do that . --- End quote --- Hi Rob, back home again, mate there really isnt a lot of corellation with regards to the 'plans' and the engine Im building. I started this thing with basic dimensions from Edgar Westburys engine, an example can be seen here: So you can see Ive deviated greatly from the engine. Actually Ive vaguely replicated what the boat has and found a plan set that will supply the technical data I needed...thank you Mr Westbury. Ive turned the configuration around, my valve gear is 'outside' the conrod. I figured that this 'needed' to be seen, why hide it away? As before, been away for work so not much progress..... lets see if I can get some shop time this week. Cheers Rob T |
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