Algodoo

Damnit, I was working on one of these. Beat me to it.

Very cool! I think you should use bending on the hinges instead so that the "iris arms" dont move out of position after a while=) And one of the crank linkages have collision a ticked and collides with one of the "iris arms".

just some feedback, keep up the good work! 10/10:D

Nice work
another one of those concepts that cant realy work in the real world
unfortunately

PS the high speed comes from the effectivly short crank stroke
not good for tourque

Christer, the engine name isnt for the way it works, its just by a novel mechanism called Internally Radiating Impulse Structure.

Gent: It can be done in real world, even the designer of it has won like $95.000!

I'm not saying it cant be done, just way too many parts, sealing and lubrication issues all for an effectivly 1 cylinder engine............

It hasn't got too many parts, just search for IRIS engine on Google Images and there's a drawing from National Geographic that shows how it's done. It has got a few parts!
Anyways, you're reasoned. I really don't know how it does to use the stroke, because the flywheel gives a very little turn and the rods get opened.