There are some issues with mogas and epoxy tanks. We ran some test on
samples coated with the Jeffco9700 FCR , and it stood up well to a mixture
of gas and alcohol concocted to be as agressive as possible. The plain resin
(Aeropoxy 2032) swelled and flaked in short order.

The mogas without alcohol is not a problem. Alcohol alone is usually not a
problem, but the mix can have deleterious effects.

My wing tanks are coated with Jeffco but the joints to close the tanks
aren't, so i am leery of using mogas with alcohol in the tanks.
Bill Schertz
KIS Cruiser # 4045
----- Original Message -----
From: <echristley@nc.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, May 11, 2004 10:23 AM
Subject: [FlyRotary] Re: Mogas issues


>
>
> ----- Original Message -----
> From: Tracy Crook <lors01@msn.com>
> Date: Tuesday, May 11, 2004 1:33 am
> Subject: [FlyRotary] Re: Mogas issues
>
> >
> > > Mogas stinks - literally.   You'll have an
> > airplane and a hanger that
> > > smells like a jet ski .   It makes passengers sick
> > real fast.  You will get
> > > tired of the transporting hassles too.   I've
> > never seen any data on
> > > storage stability, but I know the makers never
> > plan on it being around much
> > > longer that a few days.
> >
> > Oh Good grief, would anyone take this kind of
> stuff seriously?
> >
> > Tracy (ran Sun100 race on 3 week old 87 octane Mogas)
>
> Yes, at least until they knew better or they I knew
> someone with actual experience who could tell them
> different.  Better to look like a ignoramus asking
> ridiculous questions, than have a stinking airplane
> with an engine that won't run.  I posted the issues
> here, 'cause I thought there might be at least one
> or two who've flown with mogas a few times 8*)
>
> I keep hearing nebulous concerns about mixing mogas
> with composite tanks like the Delta has (alcohol
> will attack the epoxy, etc), but it doesn't seem
> like anyone has any solid data.  Just innuendo.
> That is why I was talking with an epoxy expert.  I
> appreciate Perry's data point and 5yrs of
> experience.  Perry, what epoxy did you use for the
> tanks, and do you take any special precautions when
> fueling up?
>
> The other two 'issues' were out of the blue.  The
> Cherokee I trained in used mogas.  I never noted
> excessive smell, and my flight instructor said it
> kept his plugs clean.  The issue with stale gas has
> some credence due to my observation of some
> ultralighter who religiously dump 30day old
> two-stroke mixes.  What I didn't get was how 100LL
> smelled any better or stored any longer.  Both
> issues appear to be red herrings.
>
>
>
>
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