I've looked at it. Nobody posted much of anything, and nothing for a long time. I'm on my own IF I start. I've been looking at that airplane for a LONG time, I figured it was time to scratch that itch.Ryan,
There used to be a a Miranda group on Yahoo, after Grahams death it seemed to die, a few years back someone posted about starting a build but nothing more.
Just use the HP recommended, at engine weight recommended, with the recommended prop dia. (Reduction as needed to get rpm right.)I was thinking of using a direct drive Kohler CH750 driving a 54 inch two bladed Ultra-Prop running 3600 RPM, but Lee is quite vocal that he designed this ship for a slower turning, 72-84 inch propeller. So I'll see how much horsepower it will take to drive a longer prop at somewhere around 2000-2300 RPM, and look for an engine that will give the desired HP at no more than 4000 RPM, and use a re-drive to slow it down.
I used to look down my nose at Valley Engineering, until I watched the videos of The Old Man talking about the Backyard Flyer and the Big Twin, and then the scales fell from my eyes. May His Memory Be For A Blessing; Gene Smith really did know what he was about.The valley engineering big twin was rated at 32hp continuously. They had 40 and 50hp peak versions. Weight was 120lb.
Maybe you have more experience with such engines than they did and can get a little more. But it won't be much and it won't be easy.