Abstract: A removable cover for a wheelchair tire. The cover is used to protect against the spread of contamination by the wheelchair tire. The cover may be formed of an elastic material or may have bands of elastic material attached along opposed edges to facilitate the installation of the cover over the tire and to hold the cover against the tire. The cover may be stored on the wheelchair during periods of movement over a contaminated surface, and then installed over the tire prior to moving onto a clean surface. The cover may be periodically washed to maintain its cleanliness or may be made from a disposable material.

Abstract: Disclosed is a device designed to be mounted on the outdrive of an existing marine outboard motor and coupled to the drive shaft thereof with the existing propeller removed. The invention uses chain and sprockets to transfer power from the existing drive shaft to twin propeller shafts driving twin propellers. The device may easily be mounted onto the existing outdrive and may easily be removed therefrom for repairs, storage and restoration of single propeller drive.