Elmer's #46 Comber Rotary Engine

weez · Oct 4, 2013

Here is the completed engine. I did run it for a short time yesterday. It requires about 15 psi to run. I will post a video after I do a little fine tuning to get it to run a little smoother.

jwcnc1911 · Oct 4, 2013

That looks very good! I can't wait to see the video.

I don't quite get how these work. The center line of the bearings are offset to the bottom of the ring?

weez · Oct 4, 2013

jwcnc1911 said:
That looks very good! I can't wait to see the video.

I don't quite get how these work. The center line of the bearings are offset to the bottom of the ring?

Yes, the center line of the bearings is 1/4 inch lower than the center of the ring (which is equal to half of the stroke). The ring is sort of an elliptical shape. I just finished up making brass bushings for the rollers. I was getting some binding and I hope the bushings take care of that. Will reassemble after lunch and hopefully it will run better. If it runs good, I will take a video.

weez · Oct 4, 2013

Here is the video of it running.
[ame]http://youtu.be/AliXNUD3EYA[/ame]

ausdier · Oct 5, 2013

Just like a wobbler you have ports that lineup and give a power stroke and then exhaust on the return stroke.
So here is a more liniar version of this.
Just add another roller to the other side and imagine the outter track is round.
As you can see the two circles, pivot and track are offset to give the taper needed.
Hope this helps.