A few photos of twins here....
They were all very quick, but nothing approaching QM40 speed.
Dualist - pair of SJ50 engines
Ed Morman's Dusty Deuce - twin OS25 engines with jett-stream mufflers
I believe the "black monster" is what Ed was refering to. Eric and Dave did a heck of a job on the project. It did fly, flew well, flew fast. But as has been discussed here, it never really was as fast as everyone expected. Two engines and two props are more draggy than one. (aircraft was eventually sold without the engines)
Perhaps they will spur a few new ideas and new projects
