Can you help me choosing an engine?

Hello friends! I modestly come here to ask for help.

I am an student of Industrial Design, and my topic this semester for creation was the nautical area of transports.
Our projects are not supposed to be totally functional or work practically, but we must reach the closest to reality our short experience allows.

Well, my problem is related to this boat bellow. I have its dimensions in meters (sorry, in Brazil we work with this scale, mainly).



This boat is mainly built in fiberglass (please ignore the fact that this may not be built with this material, just consider it possible), and is propelled by one central propeller and driven by one rudder after the propeller. I intend this boat to move at a max speed of 8 knots.

Well, unfortunately I can’t calculate its weight and drag right now, (which I know that are very important things to consider), but I would like someone to give me any engine suggestions, based on your experiences with it.

Please make any observations you may please to help me with this work.
Thanks forward.
Leonardo Baptista Lopes.

 

Sorry for the double posting.

 

In Brazil you can get Mercedes Benz, Ford, GM and Perkins as marine diesel engines. The boat is kind of fat, but for low speeds 75 to 100HP should be OK.

 

Thank you! I'm going to check it. Thanks also for the information on the possible hp requirements for this boat.