|Written by C. L. Easey|
Radial engines are a type of engine in which the cylinders are point outwards from a central crankshaft. This type of engine is used to power the propeller of a small airplane. To replicate an engine of this type you can build a miniature model.
Things You'll Need - 3-inch diameter plastic bottle , Measuring tape, Felt tip marker, Band saw, 12-inch, metal pipe, Copper wire, Craft glue, 1-inch by 1 1/2 inch metal squares, Electric motor, Model propeller
Determine the number of cylinders that you want for the engine. If you are replicating a Wright Radial engine then 7 cylinders will be used.
Measure the circumference of the plastic bottle with the measuring tape. The circumference of a 3-inch diameter plastic bottle is approximately 9.42. Divide 9.42 by 7 for a result of 1.34.
Measure down 2 inches from the top of your plastic bottle and wrap a piece of masking tape around the bottle. Make a mark on the masking tape every 1.34 inches around the bottle with the felt tip marker.
Attach a 1-inch hole saw attachment onto the power drill. Drill a hole on each mark around the outside of the plastic bottle.
Cut off the bottom section of the bottle 1/2-inch below the tape with a band saw. Cut the spout off from the top of the bottle.
Measure and cut seven 1 1/2-inch lengths from the 1-inch metal pipe. Drill two 1/8-inch holes into the bottom of each 1 1/2-inch piece of metal pipe 1/2 an inch apart.
Measure down 1/2 an inch from the opposite end of the metal pipe pieces with the holes. Make a mark using the felt tip marker. Wrap copper wire around the metal pipe pieces below this mark.
Insert the smaller end of the metal pipe into the holes that you cut into the plastic bottle. Use craft glue to secure the metal pipe to the plastic bottle.
Glue the 1-inch by 1/2-inch metal squares onto each end of the metal pipe on your plastic bottle. These are the cylinder heads of the engine.
Insert an electric motor into the bottom of the plastic bottle. Secure the model propeller onto the spindle of the motor.
Paint the plastic bottle black or sliver.