One of my LTD engines running on ice.
- Thread starter doc1955
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What would happen if you set it on a coffee pot and put ice on top? Would it increase in speed?
doc1955
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Yes it will speed up some what. I have two others but they do not preform as good as this one. I think it is the displacer bushing in the other two that are causing them not to run as good. This one will just about run on the heat off your hand but not quite.
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Steve I ran a cam for the little demon today it was a practice piece to work the bugs out of my program and fixture.
Still debating on starting a v8 build.
OFF topic
Steve I ran a cam for the little demon today it was a practice piece to work the bugs out of my program and fixture.
Still debating on starting a v8 build.
doc1955 said:
How did it come out? How long did it take? My second one was about 4 hours.
doc1955
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With a little hand blending it looked pretty good I'm happy with the looks and I'm sure it should work just fine.
I will make a for real one next. It ran about 40 minutes per side so about 1.5 hours. The hand blend time was about half an hour but that was with needle files.
I think I could shave off more time by increasing the feed rate by about 20% or even more if I went with a carbide cutter but the only ball end mill I have right now is high speed steel I need to either grind one up or order one.
I saved my programs and the fixture has an index hole so I can take the fixture of my machine and go back to it without to much set up time.
Making V8 Little Demon cam on CNC
I will make a for real one next. It ran about 40 minutes per side so about 1.5 hours. The hand blend time was about half an hour but that was with needle files.
I think I could shave off more time by increasing the feed rate by about 20% or even more if I went with a carbide cutter but the only ball end mill I have right now is high speed steel I need to either grind one up or order one.
I saved my programs and the fixture has an index hole so I can take the fixture of my machine and go back to it without to much set up time.
Making V8 Little Demon cam on CNC
mklotz
Well-Known Member
With the ice on top of the displacer chamber one runs the risk of meltwater getting into the mechanism.
Put the ice cubes in a saucer and set the engine on them. It will run just as well except the direction of rotation of the flywheel will be reversed.
This is a handy way to display LTD engines at shows. I use those freezer packs. Not sure of the correct name but it's a plastic shell filled with some goop. You freeze it and it acts like a giant ice cube that takes a long time to melt. My book-sized variant will run one of my engines for a full day at a show.
Encourage onlookers to put their hands on the upper "hot" plate and watch how the engine speeds up. Since most folks don't have a clue about how Stirling engines work, they will be fascinated.
Put the ice cubes in a saucer and set the engine on them. It will run just as well except the direction of rotation of the flywheel will be reversed.
This is a handy way to display LTD engines at shows. I use those freezer packs. Not sure of the correct name but it's a plastic shell filled with some goop. You freeze it and it acts like a giant ice cube that takes a long time to melt. My book-sized variant will run one of my engines for a full day at a show.
Encourage onlookers to put their hands on the upper "hot" plate and watch how the engine speeds up. Since most folks don't have a clue about how Stirling engines work, they will be fascinated.
doc1955
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Thanks Marv!
Why didn't I think of that? I put the ice on top and raised it up some the bottom plate would be exposed to the warm air makes more sense to do it the way you suggest. I like running them this way then you don't have to worry about the heat and it's effects on internal parts. Before I started doing it this way I warped several displacers with to much heat and cold works better for me so far anyway I'll try the reverse and put the cold on the bottom.
Thanks for the tip Marv!
Why didn't I think of that? I put the ice on top and raised it up some the bottom plate would be exposed to the warm air makes more sense to do it the way you suggest. I like running them this way then you don't have to worry about the heat and it's effects on internal parts. Before I started doing it this way I warped several displacers with to much heat and cold works better for me so far anyway I'll try the reverse and put the cold on the bottom.
Thanks for the tip Marv!
mklotz
Well-Known Member
Sitting an engine on an ice block works especially well at outdoor venues. The sun can warm the upper plate while the ice cools the lower. Putting some black cloth on the hot plate will increase the temperature differential and increase the speed of the engine.
maverick
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It's fun to boggle peoples minds with an LTD sterling. Put it on hot pavement and it runs,
put it on ice and it runs. They just shake their heads tell me I could make a million bucks with my secret.
doc1955
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maverick said:
HaHaHaHa I can relate to that.
I remember when I first seen one running I told myself then that I needed to try and build one of those. I've ran into people that think there are some batteries or something else making it run (even after trying my best to explain it to them) makes me grin every time!
mklotz
Well-Known Member
maverick said:
Print a stack of "shares" and keep them on the display table. Offer to sell the rubes a 5% profit share for a measly $100. (Be prepared to leave the display venue rapidly.)
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