The Seafury Surface Drives has 4 standard models (SF22, SF26, SF30 and the SF36) to suite most vessels. Seafury can provide via the online Project Application Questionnaire a free speed prediction or horsepower indication for your vessel to meet your requirements. This information is required to determine which Seafury Surface Drive option is best suited for your project. Engine size range 200 -2200 Hp 1x drive from 2.5 up to 25 tonne displacement 2x drive from 5 up to 65 tonne displacement 3x drive up to 20 up to 90 tonne displacement 4x drive up to 125 tonne displacement Larger vessels require multiple SF36 units or custom built units depending on application.