The older Twinstar was a lot of fun with a pair of good sport 40 engines. The older Magnum XL 40s did a great job. The current XLS 40 engines should be even nicer. Don't think I'd go to 46 size, could be a little too much on one side if the other fire goes out and you're slow cutting the running engine back.

Run them on low nitro fuel, and prop for no more than 12K rpm, maybe 13K, to get decent flight time with the tiny tanks. Have to experiment here, a compromise between performance and endurance.

In my opinion the Magnum XLS 40 is a better engine than the 40 FX, and a lot less expensive too.

Bill.