Yes Radio check, batteries might need to be replaced but maybe not 5 years of non use is about midlife for most nicads.
You say your prop is too tight? what do you mean? If the motor is hard to turn it probably is gummed up a little, I had a couple of old motors that where like this, one I worked loose and it ran fine, the other one I had to soak in gumout for a couple of days but it runs now.
Check your tank and fuel lines. all linkages and mounts. Treat them like you don't trust a thing and go over them with a fine tooth comb.