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One metallic chip lodged in the prop governor can put you in a world of hurt.Saying they wanted to return to the airport to "blow it out" sounds like they had a fire. What else could "Blow It Out" mean?
Saying they wanted to return to the airport to "blow it out" sounds like they had a fire. What else could "Blow It Out" mean?
For those of you not familiar with the fine points of octane rated fuels, it goes like this. Any engine running on a higher lead content fuel than it's designed for is likely to have a tendency toward lead deposits in various inconvenient spots in the cylinders, such as intake valves and sparkplugs. This is much more likely in aircooled engines, as they experience much wider fluctuations of cylinder temperatures, and it's the cooler temperatures in the combustion cycle that invite deposits.Probably something similar to this procedure.
Brandon
... especially with the remaining three 115/145 engines running on 100LL, thus power limited. As airspeed drops off, so does rudder authority, but that barn door is still out there, making a directionally controlled landing a real problem./QUOTE]
2 points:
1. Wartime standard fuel for the B-17G was 100/130, NOT 115/145.
2. Per test reports and pilot reports, the B-17 was quite easy to handle even with 2 engines out on the same wing, so having 1 out even with wind milling propshould not be too difficult to handle, especially for highly experienced pilots like now.
1.) You're right about wartime fuel, but postwar, 115/145 became available allowing hardworking recips (this one was a firetanker) to get a little more detonation margin and gain some additional HP. When the "purple brew" went away, all these big radials had to be recertified for lower octanes, reducing their available HP and the takeoff and go-around performance of their host airframes. By this time 909 was a museum piece, not a tanker, and working at much lower weights.2 points:
1. Wartime standard fuel for the B-17G was 100/130, NOT 115/145.
2. Per test reports and pilot reports, the B-17 was quite easy to handle even with 2 engines out on the same wing, so having 1 out even with wind milling prop should not be too difficult to handle, especially for highly experienced pilots like now.