Oddball engines and prototypes

[Hemi Makutu]

Might make a good basis for a bike mill.. http://www.recpower.com/3703%20-%203...02%20cycle.htm

[Flettner]

I stumbled upon this video: https://www.youtube.com/watch?v=SL1uwRtqPWE
Crank phase variaton on the fly - I love it.
I just hope Flettner doesn't see this; I'm afraid he wouldn't be able to resist...

Dangerous! No I'm all projected up. After running this injected F9 Kawasaki so much now, I'm keen to finish the 360 rotary valve project (and the gyro engine, same cylinders).

[Niels Abildgaard]

Hello Flettner.

Have some harebrained schemes for aircrafts and want to ask:
How much power /prop RPM for a single/twin Gyro and diameter of prop?
My scheme is inspired by this

http://www.pvpkart.com/112%20right%2...crankshaft.jpg

Cylinders closer together,common combustion chamber and a belt from each crankshaft to side by side props.
Very good balance and no vibrations.
Are crazy people still flying belts between engines and props?

[tjbw]

Snowmobiles have run turbochargers like the engine pictured for a long time. Some ran variable vane turbines to reduce lag. The engine pictured developed around 800 hp with nitrous injection. Below are some more pictures.

The most noted supercharged and/or turbocharged two strokes were the Napier Nomad and the Rolls Royce Crecy. Single cylinder test engines for the Crecy developed a BMEP of 321 psi with an intake pressure of 36 psi and an exhaust back pressure of 12 psi. Gas turbines were a better solution for aircraft.

Lohring Miller

Attachment 325297 Attachment 325298 Attachment 325299 Attachment 325300

Thanks for the photos, it looks great!

Napier Nomad and Rolls Royce Crecy were both very interesting engines. I also believe that the large turbocharged uniflow 2 stroke marine engines e.g. from Burmeister & Wain are noteworthy.

A 98 page history of marine turbocharged 2 stroke engines can be found here:

http://www.cimac.com/cms/upload/hist...oklet_2013.pdf

[tjbw]

Hello Flettner.

Have some harebrained schemes for aircrafts and want to ask:
How much power /prop RPM for a single/twin Gyro and diameter of prop?
My scheme is inspired by this

http://www.pvpkart.com/112%20right%2...crankshaft.jpg

Cylinders closer together,common combustion chamber and a belt from each crankshaft to side by side props.
Very good balance and no vibrations.
Are crazy people still flying belts between engines and props?

Niels, cylinders close together with common combustion chamber - like a split single?

https://en.wikipedia.org/wiki/Split-single

Some of them used a single crankshaft.

[Niels Abildgaard]

Hello TJBW

Burmeister&Wain makes me proud to be danish.
Two strokes work better with exhaust valves.
The Ultraligth Trike and Gyro engine powerplant I have in mind is a two cylinder like the PVP thing with a common combustion chamber and an exhaust valve over each piston.
Geared cranks.
From each crank a belt to a prop shaft ca .5 meter away.
Having two props of 1.2 meter diameter one meter apart gives same efficiency as a single of 1.7 meter diameter and has no torque reaction going back on airframe and gets more undisturbed air.
I will try a scheme one.

Better than picture here:

http://www.ultralightnews.com/ppcinf...s/voyaguer.jpg

[Frits Overmars]

Cylinders closer together, common combustion chamber.

Cylinders closer together would be good. In fact it's what the championship-winning DEA superkart engine has. Below you can see the PVP engine and the DEA engine.
But a common combustion chamber? Don't do it! It may sound like a simplification but its disadvantages will not justify it.

[Niels Abildgaard]

Cylinders closer together would be good. In fact it's what the championship-winning DEA superkart engine has. Below you can see the PVP engine and the DEA engine.
But a common combustion chamber? Don't do it! It may sound like a simplification but its disadvantages will not justify it.

It is important that pressure is equal in both cylinders at ALL times,ignition or not and during combustion.
To bring cylinders closer they can be staggered fore and aft and having exhaust valves make it much easier.

[Hemi Makutu]

Toyota tried to convert a 4T DOHC 4V six into an externally blown/scavenged 2T..
- but the port/time/area of even their hi-po poppet valve machine was inadequate..

Here is a chart of current big outboard mills, note the DI 2T torque/efficiency advantage.

http://continuouswave.com/whaler/ref...ger2510Bay.png

BRP/Evinrude are to fit an electronic 'power-valve' to the hi-po outboards - at long last..

[tjbw]

Hemi hemi please post correct link for "a chart of current big outboard mills, note the DI 2T torque/efficiency advantage"

[Hemi Makutu]

Hemi hemi please post correct link for "a chart of current big outboard mills, note the DI 2T torque/efficiency advantage"

More outboard data tjbw: http://www.boat-fuel-economy.com/evi...ion-us-gallons


& Piero Baldini 2T engines here: www.google.tl/patents/US20120304972

This one is a bit interesting, & while the single cylinder uses an auxiliary pumping piston, the triple
appears to be functioning as an interlinked unitary machine using the 120`firing phase synergistics.

[Hemi Makutu]

http://www.e-tech.com.my/images/graph5.jpg

[Hemi Makutu]

http://www.continuouswave.com/forum/....php?f=7&t=125

[Hemi Makutu]

http://www.ar15.com/media/mediaFiles/12631/84874.JPG

[Frits Overmars]

http://www.ar15.com/media/mediaFiles/12631/84874.JPG

I wasn't around at the time but Startrick specializes in Ducatis, so my guess would be: an air-cooled Ducati twin (which would also explain why I wasn't present ).

Hemi, over 50 companies and tuners are using my dyno hard- and software and not all of them have the good taste to confine themselves to two-strokes .