Kieth/Mark
One question for you guys. I read just read the whole thread to get an opinion on turbine position. I have a Tigermeet coming soon with a WrenSS. Considering acording to specs the SS is lighter than the standard Wren54. which would be the best position to put it. I was oringinally going to mid mount it but now I know it flies well with a tail mounted setup I am not sure which way to go???
Regards
Paul
This was discussed earlier in the thread, maybe 10 pages back or so. I went through the same debate. I weighed my Wren SS and all of the components, then measured their locations from the CG in both cases. According to my calculations the plane would come out slightly heavier if I put the engine in the tail. The plane needs a lot of nose weight to balance it. I put it in the conventional location, shifted as far forward as I could and still need 24 oz. of batteries in the nose.
From their website a Wren SS is only 30 gm. or one oz. lighter than a 54, so there isn't much difference. My take is that I wouldn't mount any engine heavier than a P-60 or Super Bee (850 gm.) in the tail. Mine came out 20 lbs. A lighter tailpipe, like Keith used, would help.
In your case it boils down to personal preference. The SS could be mounted in either location. I chose to go conventionally because that is what I'm familiar with and saw no reason to tail mount it if it wouldn't save any weight. I prefer to have the airflow through the fuse to be directed by ductwork and a tailpipe, rather than worry about pressurizing the fuse or wires and hoses flopping around in the breeze.
Joe