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That UL fuel that's "available now" [3] is available now in Sweden only and doesn't work for the 10% of engines that require 100 octane f...

That UL fuel that's "available now" [3] is available now in Sweden only and doesn't work for the 10% of engines that require 100 octane fuel, those 10% of engines likely consuming >50% of the avgas sold. If it was a matter of spending some reasonable (say mid 5 figure per airplane) sum of money to burn a readily available UL fuel, I'd do it. I literally can't do that. There is no current path to certification for me to run that 91/96UL here in the US. It's a technical problem (maintaining adequate detonation margins on a high/hot takeoffs), a regulatory problem (getting the airframe and engine certified for the fuel), and a market problem (getting that fuel sold at airports here in the US). You have to solve the first to get to the second. I believe there are several viable compounds/blends now in testing and we're on to the second phase: getting one or more of them certified by the FAA. Only once that's done is it viable to talk about banning or curbing TEL use. If there's one clear winning fuel, the adoption by the industry will be swift (no pun intended, as SWIFT is one of the contenders, though I don't believe a leading contender). I don't read any of those three AOPA links as AOPA trying to "delay unleaded fuel" in any way, shape, or form. One is an objection to an increase of tax on avgas (certainly one of the things I/we pay AOPA to lobby against), and the other two are presentations describing the technical reasons avgas contains lead now and the status of initiatives underway to create an alternative, unleaded fuel.

Posted by sokoloff on Jul 28, 2015, 7:40 PM

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That UL fuel that's "available now" [3] is available now in Sweden only and doesn't work for the 10% of engines that require 100 octane f...

sokoloffJul 28, 2015, 7:40 PM

That UL fuel that's "available now" [3] is available now in Sweden only and doesn't work for the 10% of engines that require 100 octane fuel, those 10% of engines likely consuming >50% of the avgas sold. If it was a matter of spending some reasonable (say mid 5 figure per airplane) sum of money to burn a readily available UL fuel, I'd do it. I literally can't do that. There is no current path to certification for me to run that 91/96UL here in the US. It's a technical problem (maintaining adequate detonation margins on a high/hot takeoffs), a regulatory problem (getting the airframe and engine certified for the fuel), and a market problem (getting that fuel sold at airports here in the US). You have to solve the first to get to the second. I believe there are several viable compounds/blends now in testing and we're on to the second phase: getting one or more of them certified by the FAA. Only once that's done is it viable to talk about banning or curbing TEL use. If there's one clear winning fuel, the adoption by the industry will be swift (no pun intended, as SWIFT is one of the contenders, though I don't believe a leading contender). I don't read any of those three AOPA links as AOPA trying to "delay unleaded fuel" in any way, shape, or form. One is an objection to an increase of tax on avgas (certainly one of the things I/we pay AOPA to lobby against), and the other two are presentations describing the technical reasons avgas contains lead now and the status of initiatives underway to create an alternative, unleaded fuel.

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