RE: Bomb drop on trainer?
A popsicle stick, a dixie cup and two rubber bands. Slit the cup on either side just over the bottom. Slide the popsicle stick through the slots and use a rubber band on either side where it sticks out to hold the cup to the nose of the plane. If your trainer already has a rubber band held wing you can eliminate the two extra ones and hook it on top of the wing (preferably forward of the C.G.).
Can drop an egg, golf ball, golf practice ball or a half a dozen Hot Balls by performing a half roll or Immelman over the target. Also teaches you to perform a smooth take off.
A Fun Fly standard since U-Control days.