Check the listing for details. Rc Engine K&B 40 Model Airplane Engine With muffler, Mount & Aluminum Spinner. Condition: Used. Listed at 49.00 USD. The RC Engine K&B 40 Model Airplane Engine by KB with muffler, engine mount and also an aluminum propeller spinner. This is a high-quality gas/nitro engine designed specifically for airplanes. It features a muffler for reduced noise and increased durability. This engine is compatible with a variety of model airplane vehicles, making it a versatile and reliable choice for hobbyists and enthusiasts looking to upgrade their RC aircraft. With the KB brand known for its durability and performance, this engine is sure to enhance the experience of model airplane pilots.