What's This Called

Help Support HMEM:

Ken I

Project of the Month Winner!!!
Project of the Month Winner
Joined
Oct 31, 2010
Messages
1,412
Reaction score
148
Location
Cape Town, South Africa
What is the name of this type of engine.
wahtsthis.jpg

I've looked on the net and the nearest I can find is Comber - but I don't think that's it.
I'm busy making something along these lines and will post plans etc. when completed.
But I'd like to get the name right.
Regards, Ken
 

larryg

Well-Known Member
Joined
Mar 23, 2015
Messages
64
Reaction score
28
Location
Oregon, USA
I have no idea of the name but it is neat and would make Rube Goldberg proud.

lg
no neat sig line
 

kvom

Administrator
Staff member
Administrator
Global Moderator
Joined
Jun 4, 2008
Messages
3,164
Reaction score
592
Not a comber, where the cylinder spins completely. This looks like one of the multiplicity of oscillators.
 

Ken I

Project of the Month Winner!!!
Project of the Month Winner
Joined
Oct 31, 2010
Messages
1,412
Reaction score
148
Location
Cape Town, South Africa
O.K. - This is what I'm building :-
gyro.jpg

The cylinder rotates within the main flywheel (on a different centre) it is 16mm bore x 30mm stroke.
The main flywheel rotates in a cradle of ball bearings and held into that cradle by a pair of inclined ball bearings - running at 45° - the middle of the flywheel is thence a void.
There is a smaller auxiliary takeoff flywheel running on the cylinder axle.
kvom - the cylinder spins completely - it's not an oscillator.
The drawing is horribly busy with all the details on - I'll post more as it progresses.

I'm about half way through the build - but I still need a name for it. Any suggestions ?

Regards, Ken
 
Last edited:

Ken I

Project of the Month Winner!!!
Project of the Month Winner
Joined
Oct 31, 2010
Messages
1,412
Reaction score
148
Location
Cape Town, South Africa
Here's the primary flywheel - machined from a CI castor wheel - Brass piston rod clevis is mounted.
wheel1.jpg

Regards - Ken
 

Ken I

Project of the Month Winner!!!
Project of the Month Winner
Joined
Oct 31, 2010
Messages
1,412
Reaction score
148
Location
Cape Town, South Africa
fcheslop - thanks for the link - useful.
O.K. So a "Box Of Frogs Rotary Cylinder Engine" it is !
Good luck with the Ringbom.
I just recently completed the Jonkman 60 Stirling
Jonkman60.jpg

Here it is standing next to my elbow engine.
I like it because I can run it on the bar - I modified the burner to run on alcohol.
Regards, Ken
 
Last edited:

fcheslop

Well-Known Member
Joined
Apr 7, 2010
Messages
822
Reaction score
198
Location
The land of the Prince Bishops
Hi Ken, good luck with the build
Im basing the Ringbom on one Iv already made designed by Renee Schaffer the spelling maybe wrong but you can see it here. Iv also recieved some info from Huib Vissor so with a bit of luck it should run this time
 

vederstein

Must do dumb things....
Joined
Feb 26, 2011
Messages
666
Reaction score
450
I've seem videos of similar engines. I believe it's a type of oscilator that would have been used on a small marine vessel. (But then I could be completely wrong.

...Ved,
 

Ken I

Project of the Month Winner!!!
Project of the Month Winner
Joined
Oct 31, 2010
Messages
1,412
Reaction score
148
Location
Cape Town, South Africa
Here's the cylinder assembly :-
cylinder.jpg

Note transfer pipes from distributor axle to cylinder heads.
axle.jpg


The distributor axle was a SOB to make - but no scrap thus far. For scale that's an M6 thread.
The anulus grooves provide the inlet/exhaust timing.

This is mostly going to be hidden in a wooden barrel "insulator" with hoops.

Regards, Ken
 

Ken I

Project of the Month Winner!!!
Project of the Month Winner
Joined
Oct 31, 2010
Messages
1,412
Reaction score
148
Location
Cape Town, South Africa
O.K. it's finished and it runs.
complete1.jpg

Still got to make a base.

Will do a build log and post video, plans & more in due course.

I still don't have a name for it.

Otherwise I'm calling it a "Crankless Rotary Cylinder Engine".

Any suggestions for a name ?

Regards, Ken
 
Last edited:

johnmcc69

Well-Known Member
Joined
Dec 5, 2011
Messages
284
Reaction score
43
Great job! Looking forward to seeing it run!
I think the lagging on the cylinder adds the perfect touch.

John
 

Cogsy

Well-Known Member
Staff member
Global Moderator
Joined
Jul 30, 2012
Messages
2,732
Reaction score
788
Location
Perth, Western Australia
That is a very impressive looking engine, I'm eager for the video too. Looks very steam-punk-ish to me (which I very much enjoy).
 

stanstocker

Member
Joined
Nov 20, 2015
Messages
13
Reaction score
7
Location
Gwynn's Island, VA
Crankless Rotary Cylinder Engine - how about CiRClE? Probably more an indicator of my years playing acronym soup around the DC area than a decent name, but sort of descriptive / self referential.

Heck of a fine looking engine no matter what it's called! Did you need to play around with the piston mass to avoid vibration as the rod/piston/rod end mass moves around or is the flywheel massive enough that the variation of mass position during rotation just doesn't have much effect?

Thanks, Stan
 

Ken I

Project of the Month Winner!!!
Project of the Month Winner
Joined
Oct 31, 2010
Messages
1,412
Reaction score
148
Location
Cape Town, South Africa
As you spotted only the piston / rod / clevis are the only things out of balance and while it does generate some vibration it does not appear significant.
I could add mass to the opposite side of the primary flywheel (crankwheel ?) which would counter some (but not all) of the out of balance forces.
It seems to smooth out with more revs which leads me to conclude that much of the vibration is due to the cyclic nature of the applied torque rather than mass issues.
Regards, Ken
 

JohnBDownunder

Active Member
Joined
Mar 1, 2012
Messages
42
Reaction score
10
Congratulations,
I reckon it looks great plus I too want to see it running. Video soon, Pretty please Sir Ken!
:D
 
2

Latest posts

Group Builder
Top