Our flag ship S.L. Penelope is an 18 foot (5.6 metre) all epoxy clinker ply hull custom built as a steam launch.
She is grossly over powered having an inline 2 1/2" + 4" X 4" (65+100X100) stroke compound engine and is fed with an 18 inch (450 mm) coal fired vertical fire tube boiler, which drives a 4 blade 14" diameter by 23 inch pitch propeller. Her operating system is float control bypass using our stock three pipe keel condenser  headers with no airpump so is very easy to operate. She will happily accommodate  8 people.

Our second version of a steam car called Whispering Jack again built back in the early 90s as a test bed for our vee twin engines but in those day  the steam came from a little vertical boiler at 200 psi.
In 2003 it was converted to a gas fired monotube boiler and had a couple of different configurations over a period of 2 years to do system testing and as can be seen from the picture the only place we can play with it is out at the local airport, it goes way to fast now to drive around the property, it's engine is a 2"+ 3 1/4" X 2" slide valve compound (very old technology).

The CROW is my favourite of the company toys which was first developed back in the early 1990s to have a crack at the world speed record for a reciprocating steam powered boat but went into moth balls for about  12 years, it was resurrected in 2006 and we are currently in the process of getting it to go faster with the top speed of about 60 kph (30 knots).
It is powered by a piston valve vee twin compound steam car engine with a gas fired monotube at approx 1000 psi and sounds like a very loud Harley Davidson in full flight.