Can you guys explain to me again why you would want the exauasts on either side, instead of in the middle?
I've had quite a bit of physics , and an adolescence and a half of blowing stuff up, and I would say to mount the exaust in the middle of the rear of the car. A slight misalignment of the motors will not cause any forces that you will be able to notice (They are pretty wieny motors on a pretty heavy car) I would also not fear the engines causing the car to fly. Your primary concern should be one engine lighting and one not. If this happens with your exausts far apart, the car will be much more likely to lose control. If only one fires and your outlets are close together, you will only notice a small pull, if anything.
I would also SERIOUSLY reccomend against using a X pipe or a H pipe to connect the two engines. This will only cause turbulence and heat, and ruin the performance of the engines. (sure it would equlize pressure, but it would slow exit velocity, and thats what a rocket is all about)
....hmmm, about that. It just dawned on me that if you are running the "exaust" thru a pipe system with bends in it that is larger than the smallest part of the nozzle on the engine, (I'm assuming your pipes were going to be as big as the enigne) then the gasses may just expand and slow in the first bend, and all you'll get from the exaust is some smoke and no power.
....man I keep thinking of more stuff... Have you noticed if you use a model rocket launching platform with a metal blast pad how the motors leave a scorch mark through the metal plate (can see it on both sides)? Make sure your piping can handle that kind of abuse
Good Luck! This can work
