I owned an Ercoupe for 8 years and have about 500 hours in them, so I'll add my 2 cents worth here. The 2 main AD's to worry about are corrosion on the wing spars, and corrosion under the seat in the fusalage belly. The wing spars corrode because they condense moisture in them, and with ceconite covering they can sit and corrode for 25+ years with out being inspected. If it was sprayed with zink cromate before it was covered it should have no problems, but look carefully at the bottom of the spar, you will find a small "channel" full lenth of the spar, front and rear, that will collect moisture. The fusalage corrosion is under the seat where water drains in from the sliding canopy and should go out thru some drain holes in the bottom, if they are plugged it collects and corrodes and an Ercoupe broke into 3 pieces in flight near Oakdale California about 10 years ago.
Other things to look for are the upper elevater limit adjustment. The concept of "stall proof" is to limit up elevator travel, if the elevator goes up to far, it will stall. If it goes into a spin, it is NOT recoverable because the rudders are to far out of the prop blast area. Also any Ercoupe can be stalled by diving to about 130-140 IAS and pulling full back on the elevator and holding it. If you really want to try, my dad watched someone do 2 loops in an Ercoupe back in the 1950's, then crashed on landing because he was drunk.
All Ercoups steer on the ground with the control wheel, even with rudder peddals. It takes some getting used to. They also only have one brake, with or without rudder peddals.
On pavement I used 30 pounds of tire presure to get off the ground shorter, on grass I let it down to 12 pounds to help smooth out the bumps.
If it doesn't fly straight and wings level hands off in cruise, adjust the elevator and rudder linkages under the baggage compartment floor untill it does, otherwise on a long flight one wing tank will drain first and start sucking air into the fuel pump, and whatever fuel is in the other wing becomes unusable, sometimes up to about 3 gallons.
In hot weather I usually flew mine with the top of the canopy open about 1-2 inches for ventilation, you can fly, including takeoff and landing, with it open all the way, but it will suck up all the dirt off the floor into your face when you open it.
If you're not in big hurry to get somewhere they are a lot fo fun to fly. Also for some reason women think they look "cute".
