Here's the completed elbow engine.
And a "prequel" video of it running - I piped up the exhaust so you can hear it without the exhaust noise - but the clatter you can hear is rain on my IBR workshop roof.
You can see the slow running hesitancy at the tight spot which I am hoping to run out before posting a better vid later.
http://www.youtube.com/watch?v=X0-vCBC0KkU&feature=youtu.be
Edit: It now has about 12 hours of run time and will tick over at 50rpm - I'm hoping for 30 or less once the tight spot works itself out.
I set out to design an Elbow Engine that would address some of the problems of the conventional axial flow designs by changing to a radial flow via axle porting. The use of a stiffener joint and slightly flexible "elbows" gets away with most of the alignment issues.
The pistons also rotate on their axles to further reduce running friction as does the inclusion of ball radial and axial bearings.
"O" ring sealed pistons and lip seals on the axles constrain any leakage to the exhaust.
The only oil it "throws" is what makes it past the piston "O" rings and is very little - typically the motor will run for 2 hours before the build up of oil at the cylinder throats becomes heavy enough to start throwing it about.
The G.A.
You can follow the build thread here :-
http://www.homemodelenginemachinist.com/index.php?topic=16790.0
Special thanks to: Captain Jerry, John (Bogstandard), Marv (mklotz), rustyknife, foozer, cutajar, miner49r, dsquire, Arnoldb who all passed comments, made suggestions or simply offered up encouragement it is all appreciated.
I am trying to upload the design drawings but the uploads section is not cooperating, hopefully Bob will get it sorted, he normally does.
The file will contain a 2D Autocad *.dwg & *.dxf, a single sheet *.pdf and a *.doc file containing over 40 WIP photos and instructions for anyone who's interested.
For now I have attached only the *.pdf because of file size restrictions.
Regards
Ken
View attachment ELBOW6.pdf
And a "prequel" video of it running - I piped up the exhaust so you can hear it without the exhaust noise - but the clatter you can hear is rain on my IBR workshop roof.
You can see the slow running hesitancy at the tight spot which I am hoping to run out before posting a better vid later.
http://www.youtube.com/watch?v=X0-vCBC0KkU&feature=youtu.be
Edit: It now has about 12 hours of run time and will tick over at 50rpm - I'm hoping for 30 or less once the tight spot works itself out.
I set out to design an Elbow Engine that would address some of the problems of the conventional axial flow designs by changing to a radial flow via axle porting. The use of a stiffener joint and slightly flexible "elbows" gets away with most of the alignment issues.
The pistons also rotate on their axles to further reduce running friction as does the inclusion of ball radial and axial bearings.
"O" ring sealed pistons and lip seals on the axles constrain any leakage to the exhaust.
The only oil it "throws" is what makes it past the piston "O" rings and is very little - typically the motor will run for 2 hours before the build up of oil at the cylinder throats becomes heavy enough to start throwing it about.
The G.A.
You can follow the build thread here :-
http://www.homemodelenginemachinist.com/index.php?topic=16790.0
Special thanks to: Captain Jerry, John (Bogstandard), Marv (mklotz), rustyknife, foozer, cutajar, miner49r, dsquire, Arnoldb who all passed comments, made suggestions or simply offered up encouragement it is all appreciated.
I am trying to upload the design drawings but the uploads section is not cooperating, hopefully Bob will get it sorted, he normally does.
The file will contain a 2D Autocad *.dwg & *.dxf, a single sheet *.pdf and a *.doc file containing over 40 WIP photos and instructions for anyone who's interested.
For now I have attached only the *.pdf because of file size restrictions.
Regards
Ken
View attachment ELBOW6.pdf
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