In the 1970s, the automotive world switched from leaded to unleaded fuels and the oil companies did a lot of research on knocking and how to prevent it. One of the big projects involved octane requirement increase (ORI).
In this program, cars were rated for octane requirement when new and then every 2,000 miles. The octane requirement increased until it leveled off at about 20,000 miles. [Read more…]
The pilot of the Piper Tri Pacer was attempting to land on Runway 34 at Pella, Iowa, while the wind was from 290° at 7 knots, resulting in a 50° crosswind. [Read more…]
Jake Cameron sent in this photo he named “the runway behind you.” [Read more…]