What is the best rocket engine out of the "A", "B", and "C" types?

Question

Thanks.

Answer 1

best?  it depends what you are using it for.  I think "c" is the most powerful.  I will edit this later to let you know for sure.

Answer 2

It depends on how much space you have to shoot the rocket.  The C's are twice as powerful as B's, so they go the highest (not counting D's that won't fit in that rocket), which can make the rocket harder to recover.  If you have a football field surrounded by houses or woods, use a half A or A.  If you have a huge open field, use a C and watch it go!  

Weight also matters--if it is a particularly heavy rocket (thick balsa fins, big nose, or payload area), you can kick it up a size.  I've shot some tumble recovery rockets that are basically an engine cover with fins and a nose, and their low weight lets them get really high with a smaller engine.  Some of the lightweight ones that use the T sized (for tiny, i guess) A engines go as high as a heavy rocket with a B engine.

There is usually a letter and two numbers on an engine.  The letter is a general indicator of the power of the engine.  The first number is how many seconds the main thrust will last, and the second number is how long the delay lasts between the end of the thrust and the firing of the ejection charge.  For a lighter rocket (with lots of space to fly) you may want the second (delay) number a little larger, for a heavier rocket you want it smaller.  For multi-stage rockets, the lower stages should have 0 delay.