Well here's the magnetically coupled V4 Wobbler - as completed as its going to get.
This whole engine came about due to a suggestion of "Spudeveans" about using magnets instead of springs to hold the cylinders in place and my spying some surplus 8 Dia x 5 Neodynium magnets - the rest followed.
Being a double acting V4 there are 8 power strokes per revolution (Dia 10 x 15 stroke) - by putting the cylinders at 90° and the big end wrist pins at 135° the motor gives 8 equispaced power strokes (if the wrist pins were at 90° or 180° it would give 4 double power strokes) this makes for a very smooth running, self starting motor which can run very slowly - which is nice for seeing the action.
Here's a video of it running :-
[ame=http://www.youtube.com/watch?v=JYZCwUKFoVw]http://www.youtube.com/watch?v=JYZCwUKFoVw[/ame]
Heres the build thread :-
http://www.homemodelenginemachinist.com/index.php?topic=15287.0
I have posted a *.zip file under "Plans" which contains an ACAD 2D drawing, a *.DXF file of the drawing and a *.doc file of the build log and instructions, comments, suggestions etc.
The drawing has the various parts in different layers / colours - so by switching the layers on and off you can see where it goes relative to the rest.
There are detailed drawings of all the parts (in Metric).
Heres the link to the upload :-
http://www.homemodelenginemachinist.com/index.php?action=tpmod;dl=item361
I have run it for 4 hours @ 100psi - 3000rpm (no throttle) and a further 12 hours @ 1500 (max speed with throttle attached) and nothing broke or came loose - I did of course add a few drops of lubricant every two hours.
So it seems to be reasonably robust.
The plans have suggestions and designs for incorporating the throttle into the block (as opposed to the pimple on top) as well as larger porting to improve the performance.
I'm well pleased with this - my second runner - as it will run nice and slow making the action something to see & enjoy.
Ken
This whole engine came about due to a suggestion of "Spudeveans" about using magnets instead of springs to hold the cylinders in place and my spying some surplus 8 Dia x 5 Neodynium magnets - the rest followed.
Being a double acting V4 there are 8 power strokes per revolution (Dia 10 x 15 stroke) - by putting the cylinders at 90° and the big end wrist pins at 135° the motor gives 8 equispaced power strokes (if the wrist pins were at 90° or 180° it would give 4 double power strokes) this makes for a very smooth running, self starting motor which can run very slowly - which is nice for seeing the action.
Here's a video of it running :-
[ame=http://www.youtube.com/watch?v=JYZCwUKFoVw]http://www.youtube.com/watch?v=JYZCwUKFoVw[/ame]
Heres the build thread :-
http://www.homemodelenginemachinist.com/index.php?topic=15287.0
I have posted a *.zip file under "Plans" which contains an ACAD 2D drawing, a *.DXF file of the drawing and a *.doc file of the build log and instructions, comments, suggestions etc.
The drawing has the various parts in different layers / colours - so by switching the layers on and off you can see where it goes relative to the rest.
There are detailed drawings of all the parts (in Metric).
Heres the link to the upload :-
http://www.homemodelenginemachinist.com/index.php?action=tpmod;dl=item361
I have run it for 4 hours @ 100psi - 3000rpm (no throttle) and a further 12 hours @ 1500 (max speed with throttle attached) and nothing broke or came loose - I did of course add a few drops of lubricant every two hours.
So it seems to be reasonably robust.
The plans have suggestions and designs for incorporating the throttle into the block (as opposed to the pimple on top) as well as larger porting to improve the performance.
I'm well pleased with this - my second runner - as it will run nice and slow making the action something to see & enjoy.
Ken
