As you are aware, stern drives are very difficult to keep clean. However our system will help to keep them clear from growth when the transducers are correctly positioned in the hull. All acoustically isolated fittings will only benefit from the sound waves which are emitted through the water and in close proximity to the transducer face. This is why positioning is so important. We would be happy to discuss the nature of your specific application, contact us if you have any doubts.