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Steve,
Very Interesting indeed, they do say that less corrosive to fuel lines, but still it's alcohol based and it's alcohol kills epoxy.
A good test if you can get some Butonal, is to put some hardened resin in a jar and let it sit in the Butonal for a long period of time.
George ( down under)
George,
According to the information I have, butanol is not corrosive due to its larger hydrocarbon chain. Check out the following link:
http://en.wikipedia.org/wiki/Butanol_fuel
I recently spoke with a fellow that is trying to develop a biobutanol factory to produce it from biomass, mostly waste product and not foodstuffs. He wants me to test his fuel. Not likely, as flying for the first time has enough uncertainty without adding unnecessary variables. But, it does have promise.
Best Regards,
Steve Thomas
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On Sep 17, 2009, at 12:42 AM, George Lendich wrote:
Steve doesn't it go Methanol, Ethanol, Butanol in the BTU rating - isn't it still a alcohol and isn't alcohol the thing that kills epoxy?
George ( down under)
(sorry, but the chart mentioned below is too big. If you want a copy, let me know and I'll email direct.)
Yes, but there are many formulations of vinyl ester. My entire airplane is made from vinyl ester, including the wet-wing gas tanks. The formula used from the factory was Derakane 411-45. I switched to Derakane 411-350 some time later as it was a little more viscous and wetted out better. It was also easier to get. However, if you look at the attached Derakane Chemical Resistance Guide, the 411 series is not recommended for gasohol concentrations greater than 10% ethanol. Since I cannot do anything about my tanks at this point, I am forced to live with the limitations of Derakane 411.
I don't know what the specifications are on the fiberglast resins, but those who use it ought to know. For me, E85 is clearly not in the cards. Another possible option is butanol. There are some who are experimenting with butanol as a 100% replacement for 100LL. It has nearly the same octane rating as 100LL, and about 90% of the total energy, per gallon, of gasoline. Ethanol only has about 60% of the energy, per gallon, of gasoline. And butanol does require a different air-fuel ratio. It is also not corrosive in the same way as ethanol.
So, my concern remains. It looks like using gasohol with a 10% lace of ethanol will be OK. More than that, I'll be switching to 100LL.
Best Regards,
Steve Thomas
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On Sep 4, 2009, at 11:32 AM, Lynn Hanover wrote:
Or, what are the tanks holding E-85 made out of? About 75% alcohol
.All of the underground fuel tanks are now Vinyl Ester.
Lynn E. Hanover
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