I have suggested these retracts for years on RCG under my member name LDM. These retracts simply work especially when you compare them to early brands like Robarts 615 air powered. The FMS Rotating gear will easily handle models upwards of 12 to 14 lbs.
I have used them on TF P40 Gold Edition, TF GE Corsair, I have used the non rotating gear on my TF P47 . My point is , if you want reliable retracts that simply plug into your receiver( no addition lipo, life or power needed ) they work from your receiver and esc lipo, you cant go wrong with FMS. My latest project is another Red Box TF P40 and that is why I made the purchase.
I have also used the rotating gear to replace the 79” Span LX Models P40 stock gear. I added longer struts for prop clearance .
I will try to post planes that I have used the gear in.
I also plane to use the FMS P51 gear in my 67” Kit Built P51 .
All of these models and 15 others in my fleet either use the Corsair rotating style retracts or the 1700 P51 style retracts.