Originally posted by Steward
You gotta put a 24 or 29mm motor in it
If I can make a guess here, ccookcookclan, is this one of your first rockets?
If so I think you should build the kit according to directions and not worry about putting in a bigger motor mount yet.
Several reasons for this:
---It already performs quite well on B and C motors, giving relatively low and slow flights, and is fairly easy to recover (it doesn't usually drift too far)
---It is already marginally stable with an 18mm C motor loaded, and you should probably add a bit of nose weight to the basic design
---You can get more flights for your money by using 18mm motors
The suggestion by Steward is a good one . . . for your third or fourth Fat Boy.