Search for 100LL replacement raises many questions

When I started to write this post on unleaded avgas, I sat down to read about the upcoming evaluation program for four candidate fuels. The more I read the more questions it raised.

For instance, why does Swift Fuels have two candidates?

But the biggest question concerned the percentage of the piston aviation fleet that the new candidate fuels will satisfy. A few questions arise, like which engines are the most critical, under what conditions will they knock, which airframe, propeller, operating conditions are most critical, and on and on.

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The future of fuels

Fuel is the lifeblood of aircraft and pilots. Most aircraft need it to power their engines; pilots need it, in the form of oxygen and proper nutrition, to power themselves. The November issues of General Aviation News will turn the spotlight on fuels — all kinds — and look at the current state of affairs, as well as what we can expect

As always, we’d love to hear from our readers. Email General Aviation News Editor Janice Wood with your feedback.

Using physics to fuel safely

A few weeks ago I received an email with a cartoon of a mature lady sitting back with a glass of wine. The caption read, “Another perfect day, and I never had to use algebra once.”

I smiled a little, but then got to thinking about how much we use math and science in our everyday life. And I started to wonder why people look down on their time in school taking these courses as a waste of time, because, in actuality, we use math and science many times every day. [Read more…]

Questions abound on FAA’s news about alternative fuels


Was it only me, or did anyone else find the press release by the FAA announcing that it has selected four fuels for further testing to replace 100LL this fall to be a bit peculiar?  In case you you missed it, the official press release from the FAA is here. Articles also appeared on this site, General Aviation News, and from the EAA.

None of the articles answered any of the obvious questions that came immediately to my mind, for instance:

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STC in the works for G100UL


While the government begins its testing of four potential 100LL replacements, George Braly and Tim Roehl of General Aviation Modifications Inc. in Oklahoma just finished up yet another test of their unleaded 100-octane avgas — G100UL — at Embry-Riddle Aeronautical University.

The fuel underwent flight testing and engine block testing in one of the school’s carbureted 172s.

“No issues were found,” Roehl reports. “We just lack a couple of other tests to complete our first STC on the 172.”

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Four alternative fuels to undergo testing

WASHINGTON, D.C – The FAA has selected four unleaded fuels for the first phase of testing at the FAA’s William J. Hughes Technical Center. The goal is for government and industry to work together to have a new unleaded fuel that reduces lead emissions for general aviation by 2018.

Shell and TOTAL, with one fuel each, and Swift Fuels, with two fuels, will now work with the FAA on phase-one testing, which will begin this fall and conclude in fall 2015.

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