MYT™ (Massive Yet Tiny) Engine
 

I'm not an engineer, so I thought I would toss this one out there and let you all chew it up.

Link:
http://www.angellabsllc.com/

I found out about this here:
http://groups.google.com/group/alt.rec.hovercraft/browse_frm/thread/1043a58adde8438d/dd2dbe12a3e8bee5?lnk=raot&hl=en#dd2dbe12a3e8bee5
EDIT:
Another interesting engine.

http://www.quasiturbine.com/

Interesting. Watching the animation really explained everything to me. It seems that there are two sets of "paddles" that form each combustion chamber. The housing is round (rather than elliptical in a rotary or quasiturbine engine). Each set of paddles is loosley coupled with the crankshaft--they can push it but also have slack not move while the crankshaft is moving.

The only thing I don't understand is what keeps the slack set of paddles from moving forward during the compression stroke?

Lots of contact points, gonna need a good oil - might even need to explore gear oil technology combind with engine oil technology! Looks pretty cool.

Imagine what it would do to a 951!

(And never having to worry about bent valves again.)

all this engine tech suddenly popping up

we had the 6 stroke head
then there was that engine that used a different type of crank system

now this

i guess the oil prices are starting to bug people everywhere , i mean really bug em...

why don't the big engine companies take these things up for big R&D and proper testing. ?

They will...in another 17 years.

only if they're given tax credits to do so...

25:1 compression ratio. And it's a dry sump. Sounds like a race engine candidate to me...

Looks like a 4 lobe Wankel to me - maybe a cross between a Scotch Yoke and a Wankel, then again I'm not a mech eng. One thing that I see right off the bat is the lubrication issues. The wipe is gonna spell trouble. Maybe they could go with ceramics or something.

Wouldn't the efficency be questionable due to the high air exhaust temp presenting right to the intake? (at least thats what it looks like would happen in the pic). Looks like pre-detonation will be a bugger. I think some after coolers would be needed no?

As for use as a Stirling, doesn't a Stirling have a 10-20X displacement stroke compared to its power stroke? That doesn't look right.

Again, I'm no mech eng so educate me please.

25:1 will produce unacceptable emmisions. NOx will be outta site.

Honestly, I can't picture how this would work.

..and if it works, how it won't melt. There seems to be no way to cool it.

Of course maybe some water injection/steam cooling ala the Crower Six Stroke would work.

http://www.autoweek.com/apps/pbcs.dll/article?AID=/20060227/FREE/302270007/1023/THISWEEKSISSUE

It reminds me a lot of a wankel engine too.

I do not think cooling will be too much of an issue. We solved a lot of our apex seal problems by ditching the factory seal lubrication system and simply premixing the gas like a 2 stroke. The lubricants in the fuel keep the cylinder or housing walls lubricated remarkably well.

When comparing a Rotary using the factory oil pump system, (which pumps a tiny bit of oil through a pin hole in the housing) to a premixed engine the wear on the housing walls was non-existant on the premix and the wear on the factory oiled housings was very obvious.

These guys are on to a good thing here. I wonder if it will be very efficient though. One of the huge drawbacks to a rotary is the lack of fuel efficiency. A regular piston engine can tolerate a leaner condition than a rotary, the roatary relies on the fuel for cooling and lubrications so more is needed.

So basically this thing has 1/6 the mass of a reciprocating motor but will require 6 times its own weight in emissions control devices!

Exactly what I thought. I would guess even with a thick telfon (or comparibale) coating that the disk would not last long.

I would also guess that the bearing that holds the disk thats compress together would not last long due to the opposing forces applied to them.

Hey, a 150lb engine that needs 300lb of emissions equipment, but generates 3000hp... Perfect for SUVs. ;)

And I thought the "paddles" in the actual pictures looked a lot like pistons laid on their sides and curved to accomodate a circular housing.

Re: MYT™ (Massive Yet Tiny) Engine
 

That angellabs engine looks surprisingly like one from an outfit called RotoBlock. http://www.rotoblock.com/ Some differences though.

OK...the animation on the rotoblock site made it much clearer. Still, by constantly reversing the motion of the piston aren't you wasting a great deal of energy?

It seems to me that this is a more logical solution:

http://www.roundengine.com/

Piston constantly moving in one direction with a constant torque arm.

i think bicycles are cool...

Then of course there is this:

http://www.archerengine.dabsol.co.uk/#concept