KR> Vinyl ester for fuel tanks
No matter what you use for your fuel tanks, Ethanol is bad news for your fuel system. ?If your tanks are glass, no matter what kind of resin you use, Ethanol will disolve it in fairly short order. ?If you're not using ethanol, almost any resin will work well. ?The tanks in my KR were built using Safe-T-Poxy 18 years ago, then sloshed with an alcohol resistant sloshing compound. ?The tanks in my KR have been in continual service for 16 1/2 years now and 1000 hours of flying time with no issues. I have always used alcohol free Mogas when it was available, and for the last year, I have been running a mixture of 80% Mogas and 20% 100LL. ?My KR is old enough that I even ran a tank or two of 80 Octane red Avgas through it before it bacame unavailable. -Jeff Scott Los Alamos, NM > - Original Message - > From: Timothy Witmer > Sent: 11/16/13 07:01 PM > To: KRnet > Subject: Re: KR> Vinyl ester for fuel tanks > > Pure-gas.org/ has hundreds of gas stations by states with pure gas >
KR> Vinyl ester for fuel tanks
Vinyl ester has slightly better durability for 100 LL aviation fuel. Epoxy is satisfactory also for 100 LL. Both resins will dissolve slowly in the Ethanol that our enlightened government requires to be added to automotive gasoline. In the presence of water in the Ethanol laced fuel, the Ethanol is much more active and will dissolve Vinyl ester quite quickly. (Been there, done that, got the aluminum tanks.) The water is absorbed by the Ethanol that is stored in vented gas station and aircraft fuel tanks until it reaches 6% water at saturation. All the chemistry experts I checked with refer to this condition as a super solvent for Vinyl ester. No mechanical filter will separate the dissolved water from the Ethanol. Rubber components in aircraft fuel systems are also attacked by Ethanol. Worst case is the hardening of the tiny rubber tip on the float needle for float carburetors. Recommend that Ethanol automotive fuel not be used in Vinyl ester and Epoxy aircraft fuel tanks. Sid Wood Tri-gear KR-2 N6242 Mechanicsville, MD, USA My M-19 is being constructed using the pink board and AeroPoxy laminating >> resin, but the wet cell wing fuel tanks will use vinylester for fuel >> resistance. >> >> Oscar Zuniga
KR> Vinyl ester for fuel tanks
Pure-gas.org/has hundreds of gas stations by states with pure gas On Nov 16, 2013 8:04 PM, "smwood" wrote:
KR> Vinyl ester for fuel tanks
Pure-gas.org/has hundreds of gas stations by states with pure gas On Nov 16, 2013 8:04 PM, "smwood" wrote: > Vinyl ester has slightly better durability for 100 LL aviation fuel. > Epoxy is satisfactory also for 100 LL. Both resins will dissolve slowly > in the Ethanol that our enlightened government requires to be added to > automotive gasoline. In the presence of water in the Ethanol laced fuel, > the Ethanol is much more active and will dissolve Vinyl ester quite > quickly. (Been there, done that, got the aluminum tanks.) The water is > absorbed by the Ethanol that is stored in vented gas station and aircraft > fuel tanks until it reaches 6% water at saturation. All the chemistry > experts I checked with refer to this condition as a super solvent for Vinyl > ester. > > No mechanical filter will separate the dissolved water from the Ethanol. > > Rubber components in aircraft fuel systems are also attacked by Ethanol. > Worst case is the hardening of the tiny rubber tip on the float needle for > float carburetors. > > Recommend that Ethanol automotive fuel not be used in Vinyl ester and > Epoxy aircraft fuel tanks. > > Sid Wood > Tri-gear KR-2 N6242 > Mechanicsville, MD, USA > > > > My M-19 is being constructed using the pink board and AeroPoxy laminating > >> resin, but the wet cell wing fuel tanks will use vinylester for fuel >>> resistance. >>> >>> Oscar Zuniga >>> >> > > > ___ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org > please see other KRnet info at http://www.krnet.org/info.html > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options >
