The Bucket Foundry

[Flettner]

https://youtu.be/-2AhNvDFNlQ

Linear rod crank, no cams, no scotch yoke, just a crank within a crank. Each crank offset is 12.5mm, total stroke is 50mm. Not over hung, fully supported. Clicking sound is the rod touching the case at the bottom, will sort that next time it's apart. TF 100 case
So if somewhat different than the Ryger we also can have a oil less top end with HCCI that could technically rev to approx 30,000 rpm.

[Frits Overmars]

So if somewhat different than the Ryger we also can have a oil less top end with HCCI that could technically rev to approx 30,000 rpm.

I don't like repeating myself, but you are incredible Neil.
Did you use something like this?

This way you can build your engine lower than the Ryger. I just wonder how you are going to fit the piston head. Screw it on?

EDIT: with your crank construction you could also build a nice compact 180° flat twin (not a boxer because the pistons won't be moving against each other) with truly inline bores. Do you think you can incorporate sufficient balance mass for a twin in that crank?

[WilDun]

Frits,
At Neil's place I bet it's all on now, ie getting it to actually work well instead of speculating about it! - way to go, suck it and see!

[ken seeber]

Frits,
At Neil's place I bet it's all on now, ie getting it to actually work well instead of speculating about it! - way to go, suck it and see!

Willy, I do believe things are quiet on the Hamilton home front cos Neil went down to the south island for hols or sabbatical, I'd say back by next week.
It's not risky down there is it, being Hooser territory?
The scary thing is what he might have dreamt up when he couldn't make anything for a couple of weeks.

Hope your foundry dreams have been rekindled.

[husaberg]

Willy, I do believe things are quiet on the Hamilton home front cos Neil went down to the south island for hols or sabbatical, I'd say back by next week.
It's not risky down there is it, being Hooser territory?
The scary thing is what he might have dreamt up when he couldn't make anything for a couple of weeks.

Hope your foundry dreams have been rekindled.

He called in for a couple of hours, While he was here I swear he build 2 engines from scratch using a chisel and a drill press.

[Ocean1]

He called in for a couple of hours, While he was here I swear be build 2 engines from scratch using a chisel and a drill press.

A powered drill press?

[WilDun]

Willy, I do believe things are quiet on the Hamilton home front cos Neil went down to the south island for hols or sabbatical,
Hope your foundry dreams have been rekindled.

Yeah, no doubt he'll arrive back with some new inspiration or other!
Not much going on here at the moment unfortunately - don't have the "bounce back" I used to have, but the embers are still burning!

[jasonu]

He called in for a couple of hours, While he was here I swear he build 2 engines from scratch using a chisel and a drill press.

10characters

[WilDun]

Unfortunately it's often only the 'make believe' people like MacGyver who get any recognition, not the ones who actually can! - and I'm sure that Husa is being sincere in what he says!

[husaberg]

A powered drill press?

Yeah we have that mains ellecty here

10characters

Same mullet

Unfortunately it's often only the 'make believe' people like MacGyver who get any recognition, not the ones who actually can! - and I'm sure that Husa is being sincere in what he says!

The Holywood version of Fletner would be Shorter I should have got him to clean my gutters as well.

[WilDun]

Flettner, Frits (and anyone else).

At first sight, the Scotch Yoke arrangement for converting rotary motion to linear looks attractive, although it obviously has some major disadvantages for two strokes (eg maybe not enough dwell at BDC?) otherwise it would be in everyday use!
Do you guys know any other disadvantages it may have?

[Frits Overmars]

Flettner, Frits (and anyone else). At first sight, the Scotch Yoke arrangement for converting rotary motion to linear looks attractive, although it obviously has some major disadvantages for two strokes (eg maybe not enough dwell at BDC?) otherwise it would be in everyday use! Do you guys know any other disadvantages it may have?

BDC dwell is not the problem, Will. You can design in as much dwell as you want, either at BDC or TDC.

I think the main disadvantages, not just for two-strokes but in general, are sliding instead or rolling big end pin movement, and / or high bearing contact pressures.

In comparison, I love Flettner's crank-in-a-crank-setup. It'll be interesting to see which gear ratio he managed to fit in and whether his big end pin velocity is a sinoid.

[WilDun]

You can design in as much dwell as you want, either at BDC or TDC.

I think the main disadvantages, not just for two-strokes but in general, are sliding instead or rolling big end pin movement, and / or high bearing contact pressures.

In comparison, I love Flettner's crank-in-a-crank-setup.

Yes, I was talking about a straight slot of course - I was aware that the dwell could be changed to suit, but the sliding action would be taken care of by the crankpin running in a sliding bearing block (so not just line contact)
A plain big end bearing in a conventional conrod is also sliding on a film of oil without problems, but I can see that in a curved Scotch Crank slot such as in the picture, there might just be a few problems!

I mentioned way back that someone suggested to Doug Hele the possibility of using the geared crank arrangement such as Flettner is probably about to use, he replied that the forces involved might cause problems, (then his hands were tied by Triumph etc. and he couldn't do or say too much without their say so!).

But.......I'm quite sure Flettner won't be deterred by all this negative talk and he'll give it a go anyway!

[husaberg]

I have posted this build before but this is it all in one place.
http://www.bikernet.com/pages/Bikern...Discovery.aspx

[tjbw]

I have posted this build before but this is it all in one place.
http://www.bikernet.com/pages/Bikern...Discovery.aspx

Nice engine and nice frame, but not sure about that engine in that light frame.