Toy Boats With Motor Homemade Has Anyone Here Tried Building A Full-size Putt Putt Boat?

Has anyone here tried building a full-size Putt Putt Boat? - toy boats with motor homemade

A colleague has just a toy boat from the 1950s on my desk. Its engine is a U-shaped tube and a lens-shaped, closed "Pan", which is heated by a candle.
Both ends of the tube behind the boat is excellent and water displaced by the expansion of 300 times per minute, driving the boat.
This should have the easiest boat I have ever seen.
Now I want you to build and try, my 6-foot boat with her food.

Before you get all the people who laugh at the mad professor who has built a toy size - that it works, what do you think?

Thank you, New Zealand.