Peter my Siren came with very wrinkled covering as well! Thanks for the tips about the C of G.
I bought the Siren as my second plane, I can fly my .40 sized trainer really well. A guy I know said the Siren is too advanced for me, but I bought it on the knowledge that if you don't use too much throttle it just acts like a big glider. I'm upset because I spent all this money and now someone said I shouldn't fly it.