Adding a canister muffler to a radio controlled aeroplane decreases engine noise and increases the thrust created by your propellers. Many RC aeroplane motors come in a kit with a muffler, but on larger aeroplanes, they can be set aside and substituted for a canister one. They do add extra weight, since they are heavier than the average RC muffler, but that is counteracted by the engine compartment wall that you need to remove. There is some construction work that needs to be done, but the extra benefits are worthwhile.
Cut out the rear of the engine compartment. Canister mufflers are considerably larger than standard RC ones and will need a bigger area to fit into. There must be 3/8 of an inch of space around each one to keep the mufflers from overheating.
Measure the length of the mufflers from the front to the end of the exhaust pipe. Mark the distance inside the fuselage and cut a 2- by 6-inch rectangle out of the bottom of the aeroplane body where the pipes end. The exhaust will be vented out of this hole.
Place the mufflers into the fuselage and mark where the supports will go with a marker. They need to be placed at the end of the muffler, near where the exhaust pipes begin. Remove the mufflers.
Cut a 2 to 3 inch length of silicone tubing, then slice it in half lengthwise. You need one piece to cradle each of the mufflers. Cut two 6 inch lengths of ty wrap. Epoxy the tubing to the inside of the fuselage on your markings. Epoxy the bottom of the ty wrap to the inside of the tubes.
Mount the mufflers to the engine, ensuring that the exhaust pipes point out the exhaust vent on the bottom of the plane. They should be placed inside the silicone mounts that you just created. Screw the front of them to the engine in the muffler mounts, then wrap the loose end of the ty wrap around the end of the mufflers.