The gallery on the RCV web site shows a number of models in the 58" - 63" span and 8 - 9.5#s range powered by the RCV .60. These are all R/C models however. The flying characteristics are said to be quite good. Here's one example:
http://rcvengines.com/gallery/rcv60sp_corsair.htmThe Mulligan is 59" span and the prototype weighed in at 9.5#s with a pound of lead in the nose for balance as I recall. I normally build light using good wood & decent building techniques so I'd hope to produce a lighter model.
It would be no problem for me to set the model up for both the RCV .60 as well as a regular 4-stroke mounted engine. I was originally planning to install an OS .56 Surpass and I also have an RCV .58 engineavailable. However, I really do want to install the .60SP because of it's installation ease and uniqueness. I wouldn't have to contend with cooling problems.
Unfortunately, winter recently arrived here so I won't be running any engines outside for many months. I used to fly during the winter but not anymore. I don't enjoy freezing my hands (LOL).
I'd love to have a RCV .90 but purchasing another engine is absolutely out of the question. I need to put the ones I have to use.
Thanks Fred for the good advice.