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Old Sep 10, 2011, 10:25 PM
John Fryant is offline
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Video

Oscillatingengines in operation


Here is a poor quality movie of the oscillating engine set-up in the bathtub. I had the camera set on the "compact" setting which shoots lower quality. It was running too slow in the first part of the video due to a leak in the air hose. However you can see that the rig dosen't operate as smoothly as I thought it would in the water. There is a definate dead spot in the power strokes. It runs faster, but less smoothly going astern. Haven't yet figured out whats causing the lag - more experimenting required. It might run smoother on steam than air. Also a static shot of one of the cylinders removed next to its mounting plate. Opinions welcome.
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Old Sep 10, 2011, 11:51 PM
ZEROSKIN76 is offline
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kill your idols
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i know nothing about this really but i love your work man. boat models can be great. i can see this on a gambling paddle wheeler
Old Sep 11, 2011, 02:58 AM
mtnmnstr is offline
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nice work. The only thing I can think is a flywheel of some kind.
Old Sep 11, 2011, 09:07 AM
IFLYOS is offline
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14s 180mah should be enough...
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I second the flywheel idea...having played around with solenoid motors, I found the flywheel was integral to the proper operation of them. As far as weight and diameter...experiment! I wish I could be be more helpful, but I used allot of surplus odds and ends when I was messing with them, so I kept swapping around till I was happy with the results..

Tim
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Old Sep 12, 2011, 08:48 AM
ARUP is offline
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Neat! Flywheel or higher pressure??? bigger air cylinders (which might be out of question due to scale concerns)??? increased length of cranks (again- scale concerns)???
Old Sep 12, 2011, 10:27 AM
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That is a really cool application for a oscillating engine. Thanks for sharing.
I would check the little holes or ports as you might have a obstruction in there someplace.
Also i agree, coming up with a clever application of a flywheel would help a lot. Maybe 1/2 thick flywheel on each side or something.
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Old Sep 12, 2011, 10:45 AM
tommyt is offline
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Just thinkin Instead of a non scale flywheel on either side, Why not make the paddles out of painted brass. This would give the entire paddle wheel rotational mass.
Old Sep 12, 2011, 03:49 PM
GreenAmphibian is offline
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Semper Fi
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I did notice that your operating arms worked opposite of each other. Maybe the settings are too dramatically opposed and need to be closer to each other?
Old Sep 15, 2011, 11:16 PM
Foambird is offline
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St. Louis
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I agree with earlier posts. You need to off-set the drive arms to smooth out the motion and add a small fly-wheel to give the assembly some mass to carry it through the power strokes.
Old Sep 16, 2011, 10:08 AM
donfl3344 is offline
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You do need to offset the arms. They should not be 180 deg. Also check that the two ports are at the right distance apart. I build these all the time for presents and mount them on candlesticks for the base. I build the parts on a 3" taig machine.
Old Sep 25, 2011, 05:46 PM
JonatanTuggy is offline
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Tugboat Enthusiast
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Nice engines! I agree with the above, the cranks should be 90 degrees offset in order to assure smooth running. The 90 degree offset allows one crank to pull the other past the point where piston and crank are in line.

Keep it up!


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