Jeff,

Congratulations on getting back in the air. That ½ quart of coolant may have been trapped air that purged during flight.

Bobby Hughes

N416AS-

RV10  223 hrs

Yesterday 3-May, my bird got airborne once again on its maiden flight after 2+ years rebuilding.  I had a friend test-pilot fly it while I was flight engineer watching the gauges.  Flight controls and rigging were reported to be good and the engine performed flawlessly.  The oil temperature was stable around 160F (Mazda oil cooler in series with a Fluidyne) but again the water temperature was high reaching 210F by circuit height so we backed off the throttle, did a touch and go with a 500’ circuit and parked it.  One unusual result was the cooling system pressure was only at 5-6 psi; with the high temperature it should have been 15-16 psi.  Removed the cowlings and found no leaks of either oil or glycol.  I checked the coolant level and it was down, requiring 1/2 quart to top it up. I also looked at my pinched duct and think it needs more pinching, so am already starting to modify that – hope to get another test flight in before the weekend.

Jeff

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