qmdv wrote:At the last JC fly in, I watched three people go to start their planes and noticed a lot of frost on their wings and windshiels. It was arround 35 at the time. Their answer was to start up cold and taxi to the opposite side of the ramp to face the upcoming sun then shut down and waight for the frost to melt.
After the melt they sarted up again and took off. What is wrong with this picture. Maybe to cold starts. Not too smart.
Tim
I used to see this all the time at JC during the 180/185 fly-in and I always cringed. However, this may not be as bad a technique as it seems.
IF the OAT is 35 at 7am, it may well have been 38 or so at 5am, as it often reaches it's minimum just after sun-up, long before the sun gets over the ridge. Engine oil usually lags the actual temperature by an hour or two as the temp slowly cools during the night
if conditions are calm, so the oil temp likely was around 38 to 40 at the time the OAT read 35. This is a reasonable minumum for an unheated cold start.
IF the pilots had waited at idle power until they had needle movement on the oil temp before adding taxi power to move to the sunny side to melt the frost, they likely did no damage whatsoever to their engines, and definitely would not have done two cold starts because the engine had time for the oil temp to come off the peg and taxi-ing even 100 feet would have generated enough heat so that the engine would have been reasonably warm an hour later for the second start.
Those are two big IF's, however, and I have seen many pilots fire up, wait less than a minute, and use 2000 RPM or more to break loose and taxi across the strip. This is definitely in the category of engine abuse!
LET THAT SUCKER IDLE FOR SEVERAL MINUTES IF IT'S THAT COLD!
Rocky
