"Bouncing" 2-stroke model engine

[Jan Ridders]

Hi all interested,
I designed and made an absolute silly but unique 2-stroke model engine. The fly wheel and crank shaft are absent and are replaced by a only a steel weight, hanging on the piston. This weight pulls the piston downwards making the compression in the glass cylinder below the piston. The combustion of the gas mix below the piston pushes it upwards again with what the sucked-in fresh gas mix above the piston is flushed via two one-way ball valves through the combustion chamber below the piston so the process repeats itself; see the video:
[ame]http://www.youtube.com/watch?v=bumwz7kvjtQ&list=UUOWqwLEIfORZB09qQirdkag&index=1[/ame]
You can see and read all about it on my web site; page:
http://heetgasmodelbouw.ridders.nu/Webpaginas/pagina_stuiter_2_takt/stuiter_2_takt_frameset.htm
I will make some optimizations coming weeks and then make the final version with a new video, the description on my website and the drawing plan.
Friendly greetings from Holland,
Jan Ridders

http://www.youtube.com/watch?v=bumwz7kvjtQ&list=UUOWqwLEIfORZB09qQirdkag&index=1

 

[aonemarine]

upon first glance I didnt think this engine would run.....but it does!!! and runs well. shows what I know....

 

[Cogsy]

Another excellent design. I'll definitely be adding this to my build list.

 

[Herbiev]

Hi Jan. this engine you call silly is also beautiful and unique. It is really a work of art. Congratulations on another great design and many thanks for taking the time to post it

 

[nemoc]

Hi Jan, I really like this engine. Runs great! Thm: I have never seen anything like it.

Craig

 

[mu38&Bg#]

This design is called a free piston engine. They were often used for air compressors where there is a second cylinder that compressed the air. There are also generator designs using this idea. Great execution and finish as usual.

 

[myrickman]

Jan- very neat free-piston engine! Top shelf on the planning, fabrication and video documentation. MM

 

[nemoc]

Thanks Greg, I googled it and found some great stuff.

Craig

 

[te_gui]

A friend has a Barco tamper that works off the same idea. the piston is inline and attached to the tamping foot and the cylinder floats. You pull the cylinder housing up and then down, the mag gets flicked and the whole thing jumps into the air.

 

[Jan Ridders]

Hello,
Thank you all for your positive comments. I just implemented some significant improvements and the engine is running perfect now. I will revise the text on the concerning page on my website and show the results with a video some of these days, here and on my web site http://ridders.nu
Friendly greetings and a Merry Christmas and a Happy New Year to you all.
From Holland,
Jan Ridders

 

[AussieJimG]

Another piece of moving jewellery! Thanks Jan and Merry Xmas to you.

Jim

 

[Jan Ridders]

Hi all
I made an improved MK2 version of the “Bouncing 2-stroke engine”; see the new video:
[ame]http://www.youtube.com/watch?v=tYvBBTREuCk&list=UUOWqwLEIfORZB09qQirdkag&index=1[/ame]
Also because I got a lot of comments, questions and suggestions about the first version I revised the whole text on the concerning page on my web site:
http://heetgasmodelbouw.ridders.nu/Webpaginas/pagina_stuiter_2_takt/stuiter_2_takt_frameset.htm
There you can read and see more details about the principle, my experiments and the final results.
I wish you all a Merry Christmas and a Happy New Year.
Jan Ridders

 

[Jan Ridders]

Hi all,
I just finished the plans for the "Bouncing 2-stroke engine".
Available via my web site; page:
http://heetgasmodelbouw.ridders.nu/Webpaginas/pagina_stuiter_2_takt/stuiter_2_ta\
kt_frameset.htm
See also the video of the final version:
[ame="http://www.youtube.com/watch?v=tYvBBTREuCk&list=UUOWqwLEIfORZB09qQirdkag&index=1"]http://www.youtube.com/watch?v=tYvBBTREuCk&list=UUOWqwLEIfORZB09qQirdkag&index=1[/ame]
Friendly greetings from Holland,
Jan Ridders

 

[Jan Ridders]

Hi all interested,
I just finished the plans for the "Bouncing 2-stroke engine".
Available via my web site; page:
http://heetgasmodelbouw.ridders.nu/Webpaginas/pagina_stuiter_2_takt/stuiter_2_ta\
kt_frameset.htm
See also the video of the final version:
[ame="http://www.youtube.com/watch?v=tYvBBTREuCk&list=UUOWqwLEIfORZB09qQirdkag&index=1"]http://www.youtube.com/watch?v=tYvBBTREuCk&list=UUOWqwLEIfORZB09qQirdkag&index=1[/ame]
Friendly greetings from Holland,
Jan Ridders

 

[canadianhorsepower]

I'm speechless

 

[cfellows]

Jan, you've provided many interesting projects and solved a lot of problems for the rest of us model engine builders and I would like to thank you for all the contributions you've made.

This one is very interesting to me because some of the 2-stroke innovations you've made might prove valuable in the 2 stroke Bessemer model engine I'm trying to design. I'm curious about the expansion vessel. How did you determine the need for it and did you try different sizes?

Thanks for all you've done...
Chuck

 

[Jan Ridders]

Hello Chuck,
If the piston is compressing the fresh sucked-in gas mix from the carburetor the pressure of it will counteract the piston movement. Without an expansion vessel this pressure can be so high that the engine runs bad or even not at all. The expansion vessel acts like the crankcase of a normak 2-stroke engine in what the gas mix is compressed to the right pressure. To find out the optimal size of the vessel I connected a rather long silicon rubber hose instead of the vessel that I could squeeze on various places and I determined when the engine behavior was best. In this case it turned out to be about 10 cc, but it is not that critical; +/- 20 % will be OK also.
Thanks for your reaction and nice words,
Jan Ridders

 

[aarggh]

That is simply amazing, what I wouldn't give to see one up close!

cheers, Ian

 

[Scooterseats]

This concept reminds me of a gas powered Pogo Stick that I saw once. It was galled a "Hop Rod" I believe. I always wanted to try it out but it was on display in a store in a small town in Oklahoma.

 

[cncjunior]

Hi Jan,
This is amazing in elegance and style. I like how you incorporate glass into your designs. A group of use made one of your Stirling engines spearheaded by someone you have been in contact with kbcustom on youtube. With glass you can see the workings of the engine which is one of the reasons I like steam engines with all the visible whirling parts. Thank you.

Daniel