Hi all:
James also posted this question on the "other" forum, so I'll post here what I posted there as well in answer to his question:
The Caprice will fly just fine with the Magnum 36. In fact, that's what I originally planned to put in the replica model. The original one - back in 1967 - had a Fox 35 originally and flew okay with it, and it really came to life when I retrofitted an OS 35 S into it. That model, by the way, weighed in at 50 ounces or so. The new one is 41 ounces now (was 39 ounces when it came off the bench ready for the first flight). Some trim weight here and there and a bit of oil soakage (man, do I love electric power...) has added a few ounces.
I'd have to say that the Aero Tiger 36 from Randy is the preferred engine. It very powerful, easy to tune, powerful, reliable, powerful, friendly, and, oh yes, it's powerful. Did I mention that it was powerful? If possible I'd use the Aero Tiger, but in a pinch the Magnum will do fine.
The attached photos depict the nose with the Magnum fitted during construction. The change to the Aero Tiger was made before the first flight.
Later - Bob