or something like this. the 2 rectangles are the engines and just make the exhaust a Y pipe. that should also solve the firing problem. if one doesnt light or they dont light at the same time you will still have some propultion. right?

that would work, but I think he was goin for double pipes.

Why not one, and route it into 2 pipes. It would make it slower, though.

That would work, but we still havent determined weather this is for effect or for preformance.

he is doing this for the performance.

Uber_hampster, Yes that is what i was thinking of. the two engines and the Y pipe is a great idea too. That way you could possibly have double the power and if you dont get both to light then it would still work.

By the way. where is eetoi? It seems that he has forgotten his topic. Any thing in progress?