Last weekend I maidened my CMP 54" Zero, I also had a OS 46FX onboard.

I also had a lot of weight up in the nose for ballast, I had to add about 7.5 OZ of lead to balance at 100mm per instructions.

When I took mine off it was way out of trim, one hell of a ride, until I got it trimmed out. After trimming it still flew pretty much like a dog, felt heavy in the air and underpowered.

My 46 FX is well used and very well was not producing full power.

On first landing the entire retract rails tore out of the wing, this one will sit on the shelf for awhile until I finish other projects, I will probably remove the covering on the bottom of the wing and reinforce 6 inchs on all side of the retract mounts.

What was the final weight of yours, mine weighed out at 6.5 LBS, seams kinda heavy for a 54" wingspan.