i did the math which is 390 divided by 144 equals 2.7 and 5,5 lbs translates to 88 oz which is divided by 2.7 giving u 32. something oz per sq inch. every airplane I fly, i do the math to get an idea of how it'll fly but also taking into consideration the airfoil , tail area is included into the equation as well. for example I put together a kyosho p-40 for my dad and the wing loading came out to 23 - 25 oz per sq inch. its 7 1/2 lbs.. with that in mind I put a stronger motor to compensate for the extra weight. it comes in hot without flaps but penetrates wind really well.. u did'nt mention the motor used on u r skyraider but i hope it's got extra oommpphhh....i'm also using a 14 X 10 prop on the p-40 to have the extra thrust / torque to control landings.. anyways u r plane might come in hot or kinda fast..whats the airfoil ? so for it's size u most likely have closer to 450 inches total including fuse, tail so 450 gives u more closer to 28 -29 oz per sq inch. even at 30 with ur experience you'll do fine..probally have a ball with the bird.. do u fly in wind ? calm days will give hotter landings unless u go aft with cg to feather it in.. I flew slopers with higher wing loadings and it was awesome in wind...everyone else stayed down so i ended up with the whole sky....