Interesting Engine

[luvflyin]

Skip the Miata stuff and go to the video about halfway down the page. Is it feasible for a typical GA airplane??

Company Builds Powerful 500cc 'One-Stroke' Engine, Immediately Installs It in a Miata

INNengine's half-liter opposed-piston engine makes 120 horsepower in an ultra-compact, super-efficient package.

www.thedrive.com

EDIT: You can look down to post #8 to skip the Miata stuff go directly to the engine video. Thanks @WDD

 

[Let'sgoflying!]

A couple weeks ago I was looking at this drone, trying to figure out what kind of engine it was; I only had a few seconds, and failed to snap a pic of the engine. It reminded me of the general external outline of ‘yours’.

 

[Chip Sylverne]

Reminiscent of the old DynaCam that was going to save aviation. The problem ended up being insufficient lubrication of the cam surfaces.

 

[Capt. Geoffrey Thorpe]

Reminiscent of the [long list here] that was going

to be the engine of the future.

 

[robin ardoin]

dyna-cam home page

I recall reading about that project years back. Interesting history I suppose.

 

[Dan Thomas]

A commenter on that article says this:

Need efficiency specs. Also, I am not a drivetrain engineer, but this thing looks like it wouldnt hold up to high RPMs. I would assume the pistons would "catch air" or float over the output shaft humps with enough RPMs.

He has a point. The weight of the piston and "rod" will tend to float off the cam surface until the combustion pressure catches up with it, then it will it the cam hard. A high-RPM problem.
With eight cylinders in a low-mass engine, cooling becomes quite difficult. The Wankel had problems that way. At least 50 or 60% of the heat energy released from the fuel is waste heat and it has to go somewhere. Much goes out the exhaust, but the rest has to be carried away by coolant of some sort, and I'd like to know how they're managing that in that "new" design.

After six or seven decades of this sort of stuff, we older folks take a wait-and-see attitude:


https://www.macsmotorcitygarage.com/ramblers-forgotten-1964-rotary-engine/

...and it was different from the Wankel.


From 1950:


1961:



1975:

 

[Shepherd]

They are claiming 120(ish)hp. I wonder what the torque is?

I want one. Max the rpm to 2575 rpm, no high rpm float.
I'd try to fly behind it.

 

[WDD]

Skip the Miata stuff and go to the video about halfway down the page. Is it feasible for a typical GA airplane??

Company Builds Powerful 500cc 'One-Stroke' Engine, Immediately Installs It in a Miata

INNengine's half-liter opposed-piston engine makes 120 horsepower in an ultra-compact, super-efficient package.

www.thedrive.com

Here is a link to the suggested video.
BTW - I really like this person's YouTubes on engine tech in general.

 

[3393RP]

A couple weeks ago I was looking at this drone, trying to figure out what kind of engine it was; I only had a few seconds, and failed to snap a pic of the engineView attachment 119016View attachment 119017View attachment 119018. It reminded me of the general external outline of ‘yours’.

Judging from the pan under the engine, it's obviously a radial.