Hi Farron, Thank you for your reply. Indeed, I have already been in contact with Andy Winter as well as Beta in GB. They are excellent to work with. Being in 'the business' myself, I have an insatiable desire to learn all that I can to get the best set up possible. I see many well satisfied owners running Beta engines making comments about their engines on the web so am enthusiastic to also hear about hydraulic propulsion being used with Beta engines. All the best. Regards, John.