I am trying to research what engine such a vessel as the ones below in the 1920's / 30s would have had. I presume it would be powered by diesel. I am particularly interested in how to start it - would that be by a cord or a crank or a key?
I've been googling without luck. Any help welcome!
I once wrote something featuring Dorothy Levitt, who raced Napier motorboats in the early 1900s. Napier made diesel engines, though I don't know if they made diesel powered boats in the 20s/30s. I think petrol was as likely a fuel as diesel, in any decade.
Anyway, I found the following site, which may give you something useful: