Check this engine out. Would be neat to see something like this in a plane. http://www.wimp.com/miniengine/

Very cool video and engine, Drube; thanks.

The more common multi-cylinder engines for models have been radial and opposite; I don't know of any, but maybe somebody has seen a line or V multiengine flying a model.

In lines have been powering models for quite some time. 3w, Taurus, Sachs, and a company in Canada have made them for a very long time. I haven't seen any Vee types, though I believe them to be out there.

The problem with "non standard" cylinder arrangements is cost. Relatively easy to find cranks and make cases for opposed, but nearly impossible to find cranks for other types. Modeling in actually only a very small percentage of the gas engines sold for use so if another inductrial application is not readily availble nobody would bother with products considerably more expensive to make. Modelers would not buy enough of them to justify the expense of manufacturing. 10 or 30 engines a year would not fund a business or maintain a production run. Radials are another that sell very few for the effort and expense involved with their manufacture, which explains the higher selling prices.

Would be very cool though to see a big Spitfire or Mustang with one of those engines and scale exhaust. That could be a warbird I would love.</p>

There IS a company in Canada that made operating scale kits of the Merlin and Allison for their very scale and detailed warbird kits. They were extremely expensive but fully functional.

I think it would be more realistic in a 1/4 scale 1967 Jaquar XKE.

That would be great!