if you want no hassle retracts the only good retracts for 60-90 size planes like the corsair or the p40 are from sierra, and are a bit expensive. you can make the robarts work but they take some constant maintenance and good landing skills, plus a smooth runway. so i would recommend either the modeltech p-47 or the world models 60 size mustang. another possibility is the hangar 9 mustang. all of these are reported to be good flyers. i have the hangar 9 mustang with the st g90, side mounted with a bisson pitts style muffer. i did some beef-up behind the firewall, sheeted the bottom of the horizontal stab, beefed up the wing mounts bolt plate, and replaced the retracts with spring air gear designed for 3/16 wires. i also moved the retracts 1 1/2 inches toward the fuse on each side to get rid of the stilt like look of the original gear. mine has been flown hard now for two years and is still going strong. i originally had a saito 100 in it and eventually changed it out to the g90. there's a pic of mine in my gallery taken when i had the saito in it.

i would take a hard look at any arf you buy and consider beefing up potential weak areas.

for kit builts i would consider the top flite p47, which can be built as a razor or bubble canopy. mine flies well on the g90 i have had in it, although i am now changing the g90 over to a st2300. i want to see what it will do super-powered . the top flite mustang i have flies well on the g90 i have in it.

another retract you might consider is the steel frame robart 60 size- i think these are 530s or 550s. anyway if you want to use oleos these retracts will take 7/16 oleos which you will want for durability.

good luck

ed