At times I get the feeling that I have taken on far more than I can chew given that I'm neither an aerospace or mechanical engineer... Who is that? Very few people have even heard of them so anyone who knows of them on this site would be a useful contact. At the moment I've done a lot of guestimates of what the change will mean, for the rotary engine I'm planning on using the aftermarket alloy end and centre plates which will bring the engine weight down very similar to the Allison's 114 kg, but then I have to add in radiators, coolant etc. I will get back some weight with the removal of the ejection seats and replacing them with carbon fibre motorsport seats. I'm certainly hoping to succeed with the Wankel to fan connection as I haven't really considered any alternatives. The performance of the planes that have the Allison + fan & duct is very satisfactory so hopefully I can make it work as it will be a sweet plane to fly if I do.