I'm currently building an UltraSport Plus and plan on putting in Robart 608HD retracts and using a JR Sport 791 retract servo. Is this overkill? I'm trying to decide if I should save these for a larger, yet undecided build in the future or just go ahead and throw them in since I have them already.

The retracts are rated for 6lb+ planes and I got a great deal on the retract servo, so I went with it. The retracts have 3/16" wire and the servo is slightly larger than a standard servo, but has a lower profile. I'll be throwing a 55ax in the plane, so I'm sure power-to-weight won't be a huge issue.

I'm mainly curious if there will be a fit, balance, or any other issue with this setup. I know many of the more popular builders on this thread have built several of the original US40 kits with various setups and was hoping one of them could chime in with their opinions or suggestions.

I was also thinking of moving the retracts out one rib bay to allow me to swing a 13" prop more comfortably. Is this necessary or can I get by with the retract location as designed?

I appreciate any and all constructive ideas. Thanks!