Made and installed a 5/8 inch orifice for thermostat fitting. Made a flap door.

Hahn flew first flight of day. 76 degree OAT. Repeat pattern from first flight, 4900 RPM 135 knot patterns and oil stabilized hot side at 230 and water only  read 212.

I flew the #3 flight with door clamped open but OAT was 87. Temps were about the same.

Later discovered that while calibrating the water temp probe with boiling water yesterday, I had temporarily moved the wire to the cold side probe. So todays test meaningless regarding flap and orifice on water temp. Will repeat tomorrow afternoon weather permitting.

Total flight time about 1 hour.

Bernie, hoping to fly to Lakeland