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No, I wasn't speaking of polyester. You can buy epoxies of different
ratios. I'm told by expert (Gary Hunter) that all epoxies which use ratios like
80/20 have significantly better mechanical and chemical properties. This is
measurable, and agrees with my and other peoples tests. Like I say, I
tested all of the fuel tank components in various batches of alcohol
fuel for years (you know how I don't like design assumptions). None of the
components were affected. The only exception was when I exposed 50/50 epoxy mix
to fuel. It slowly got mushy.
I have seen fuel tanks destroyed, leaking like a sieve from exposure to
alcohol fuel. One reportedly had old version of proseal inside. It completely
peeled off tank inside. Clogged fuel port. Forced landing. If memory serves
me correct, it also had poly that degraded by erosion. It looked like someone
had etched the poly out of the tank.
Al,
You must be speaking about Polyester as Epoxy
must absolutely maintain a strict ration mix, as per manufacturers
instructions, to allow proper molecule to molecule bonding of the
hardener and the resin. Polyester on the other hand has flexibility in that,
more hardener promotes hardening sooner.
George (down under)
I tested the hell out of that. No effect. Years of exposure to
different batches of known alcohol. I understand that if you use a resin of
high proportions of hardener to resin, it's resistant. If you use 50/50, it
isn't. I had 50/50 get soft from fuel exposure.
This info consistent with all the other guys that did the same
test.
-al wick
Artificial intelligence in cockpit, Cozy IV powered by
stock Subaru 2.5
N9032U 200+ hours on engine/airframe from Portland,
Oregon
Prop construct, Subaru install, Risk assessment, Glass panel
design
info:
http://www.maddyhome.com/canardpages/pages/alwick/index.html
It will make it less attractive for those
with fiberglass tanks. Alcohol/gas mixes are more aggressive than either
gas or alcohol alone.
Bill Schertz
KIS Cruiser # 4045
----- Original Message -----
Sent: Tuesday, January 17, 2006
8:17 PM
Subject: [FlyRotary] Auto
fuel
By the Farm Bureau Paper it is stated that
Wisconsin has passed a law that all 87 no lead will contain 10% alcohol
and that nine other states are considering it. It didn't mention
the other no lead grades. Here in Michigan it is under
consideration at this time, and there is a good chance it pass.
Other than cutting the power some what, is going to effect the operation
of the rotary in some other way. JohnD
-al wick
Artificial intelligence in
cockpit, Cozy IV powered by stock Subaru 2.5
N9032U 200+ hours on
engine/airframe from Portland, Oregon
Prop construct, Subaru install, Risk
assessment, Glass panel design
info:
http://www.maddyhome.com/canardpages/pages/alwick/index.html
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