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| Bluechip:
Hi Stew Very nice looking engine, followed with some interest. Now, I know what I think they look like, so, before you get arrested, .. How does the ally bit stay inside the brass rim ? Shrink fit? or what? Dave BC |
| sbwhart:
Dave I'll be using good old high strength loctite thats what's holding No 1 together, its not moved after quite a bit of :hammer: Cheers Stew |
| madjackghengis:
Well Stew, every time I watch someone work on an "elbow engine", I reflect on the actual forces that are enacted through the two cylindrical sets of cylinders, and consider my work on hydrostatic drives sufficient for my own purpose when it comes to elbows. Having just rebuilt a few hydrostatic drives for lawnmower and woods maintenance equipment, you may know that I am watching with eagerness, hoping you will come out with an engine that spins freely and at high speed in the end, and brings out the least number of curses. I've seen a stirling engine built on the same principle for the expanding cylinder, but at about a thirty degree angle rather than a right angle, and I believe it is because the lower angle gives a better leverage ratio and less friction loss, but at the cost of pressure and power in the stroke. Popular Mechanics had a version it published back in the sixties or early seventies, where there was a hinge joint on each of six sets of pistons/rods, and while I believe the claim it ran great, I am still at a loss as to how, without binding up completely. Watching with baited breath, looking forward to seeing that engine run :beer:Mad Jack |
| sbwhart:
Jack Elbows fascinate people, they look deceptively simple to make but as you say a bit of a beast to get running, I was lucky with No 1 it ran first time of trying although it had some tight spots, still has, you need to get everything dead square which is easy said than done, I'm keeping my fingers crossed that No 2 will be a runner. Thanks for your interest. Have fun Stew |
| Bluechip:
--- Quote from: sbwhart on February 20, 2010, 12:00:14 PM ---Dave I'll be using good old high strength loctite thats what's holding No 1 together, its not moved after quite a bit of :hammer: Cheers Stew --- End quote --- Tks Stew, have now taken the opportunity to go through the whole thread. Something I should have done in the first place. :doh: They really are a curious device. But, when the one on Bogs Vid. slows down, either strobing or whatever, you can just about see what's going on. I wonder how the originator came up with the principle? Far too precise for me to attempt. After yesterdays antics, anything is :( Might as well confess, drilled a hole in a transformer... greatly improved the cooling, electrically it is done for. Ah well, order to Farnell tomorrow... :doh: Dave BC |
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