Message-Id: <5.1.1.5.2.20040512073405.024c9d68@localhost>
Date: Wed, 12 May 2004 07:44:02 -0500
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
From: Mark Steitle <msteitle@mail.utexas.edu>
Subject: Re: [FlyRotary] Re: Mogas issues
In-Reply-To: <list-3228117@logan.com>
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Bill,
As I recall, the problem with running mogas in Lancairs was not with the 
Jeffco sealer, but with
the adhesive (Hysol 9339) used to close up the wings.  There is a bond 
joint around the fuel tanks
that you can't seal with Jeffco and that's where the problem lies.  I think 
the ethanol was the real culprit.
I don't know if this was urban legend, or if all the Lancair guys run only 
100LL.  I will run some
tests on the Hysol before I use mogas.  I sure don't want the wings coming 
apart in flight.

Mark S.


At 10:16 PM 5/11/2004 -0500, you wrote:
>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.
> >
> >
> >
> >
> > >>  Homepage:  http://www.flyrotary.com/
> > >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>
>
> >>  Homepage:  http://www.flyrotary.com/
> >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html