Upload & Sell: On
NightOwl Cat wrote:
I'm no expert in these things, but I also wonder how much of a role the weather had in this, as the area I'm in, not that far from the airport, had rain and was extremely muggy when I got home. The airport's on the north side of I-70 and I live on the south side of I-70, less than ten miles between us, I'm guessing, in a straight line.
Hot and humid (I read it was 90+ in Dayton yesterday, with RH around 75%) is the worst combination for density altitude. It's not well known outside aviation circles but humid air is less dense than dry air, despite what it feels like to us. Increased density altitude reduces engine output and increases true airspeeds, and thus reduces the performance margins built into any low-level airshow act. The last airshow fatality I remember in Colorado (where density altitudes at the surface in Denver often soar to 10,000' or more) was a victim of density altitude: the wx for Sunday's show was 10-15 degrees warmer than on Saturday, and a MIG 17 pancaked into the ground on the backside of a low-altitude loop: he didn't get quite as much altitude at the top in the hotter weather and didn't have quite enough margin to finish the maneuver. Almost, but not quite.