Beta Marine is primarily a distributor of engines for displacement boats, as such the answers given here are speculative and we make no guaranty of the accurracy given in the response as your requirement is for a planing boat.  Also, we have no experience with surface drives, these are usually associated with high performance boats, so we are not able to respond regarding this type of propulsion system with a small lightweight diesel.

You have not given much information regarding the boat to allow us to respond fully, so we have made some assumptions.

We estimate that our 35 HP diesel will give you a top speed of approx. 14mph.  Our bigger engines will obviously allow you to go a little bit faster. We have assumed using 1.5:1 transmission to give you good propeller speed.  We cannot comment on using this configuration for trolling, however my prior knowledge tells me that hydraulic transmissions with trolling valves are required with diesel engines, this is possible, but it would add additional expense, as we would normally use a mechanical transmission on this size of engine.

I will not discuss prices on this forum, please contact Beta Marine on 877-227-2473 or email me robert@betamarinenc.com for information.