People tend to over engine model boats, or rather they make the engine then think about a boat to put it in that they can fit in their car. So a typical one is a Stuart D10 or launch engine in a 4ft model when they can easily provide scae power for a 6-7ft one. Part of the trouble is the Stuart Launch engine looks the right proportions in a 4ft launch but then only needs about 20lbs pressure to turn it into a speedboat.

There is a design for an twin cylinder oscillating engine and launch in the old MAP plans called Miranda. The proportions are not great for a launch (ok lets be honest it looks awful). However some dozen years ago someone on the Paddleducks forum pointed out that you can turn the engine design upside down, keeping the framework the same way up so the crankshaft is over the top. It then closely resembles the sort of oscillator used in paddlwheelers in the mid 19th century. I don't think Waverly actually has that type of engine but still worth consideration.

Otherwise assuming you don't want a double diagonal have you looked at the "Marcher" engine design which should do for a 4ft boat.

I am assuming you live in the UK here.

You will need the boiler testing for public or club running, yes, but most of us have our models' boilers tested via the model-engineering club scheme.

You do of course need to be a full member of a club associated ( most, via one of the Federations) with the scheme – but this includes most model-engineering societies and more specifically the Model Power Boat Association..

You are right: Waverley's engine is not an oscillator, but a triple-expansion diagonal with conventional fixed cylinders and Stephenson's link-motion.

Martin try another club first…..they are all not so bad…..

I remember being the old fart in the space suit once……

all change when they needed a 100hp 4×4 tractor……long storey……still never joined tho….hahaha….

independance is a fine thing…..enjoy…..

Have you put a dent in the bows for authenticity?

Regards Ian.

Good to hear someone is still using Tycols. I have a Supermarine which in a way would be suitable with the shaft being available both ends. A bit of chain drive would be sort of in keeping too.

Edited By Bazyle on 17/09/2020 13:55:51