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Date: Mon, 9 Mar 2009 11:23:48 -0600
From: Bob White <bob@bob-white.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: 87 OCTANE MOGAS TEST (SOREL-TRACY, PROVINCE DE
 =?ISO-8859-1?Q?QU=C9BEC,?= CANADA)
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Hi Jeff,

Sorry, I have to disagree.  The water value is arbitrary.  25 ml was
used to start, but it could have been any amount.  The water wasn't in
the fuel to start with, it's only used to suck the alcohol out of the
gas. You need to look at how much fuel was added and how much alcohol
you got out of it.

Bob W.


On Mon, 9 Mar 2009 10:08:50 -0700
Jeff Whaley <jwhaley@datacast.com> wrote:

> Hi Bob, the answer is the same 6.66% ...
> The initial volumes were 200ml fuel and 25ml water for 225ml total.
> The total volume never changed but the water content increased from 25 to=
 40ml or by 15ml.
> Therefore the alcohol content is 15ml/225ml or 6.66% of total volume.
> Jeff
>=20
> -----Original Message-----
> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On B=
ehalf Of Bob White
> Sent: Monday, March 09, 2009 12:57 PM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: 87 OCTANE MOGAS TEST (SOREL-TRACY, PROVINCE DE Q=
U=C9BEC, CANADA)
>=20
> Hi Jeff,
>=20
> I agree with your math, but what is the question?  The 15 ml represents
> a 6.6% increase in water + alcohol, but so what.  If you started with
> 50 ml of water, you would still get 15 ml of alcohol out of 200 ml
> fuel, so the increase would be 15 ml / 250 ml =3D 6%, or use 100 ml of
> water ant you get  15 ml / 300 ml =3D 5%.
>=20
> Isn't the question - what is the percentage of alcohol in the fuel?
>=20
> Bob W.
>=20
>=20
> On Mon, 9 Mar 2009 09:38:06 -0700
> Jeff Whaley <jwhaley@datacast.com> wrote:
>=20
> > Sorry double typos ... just got back from vacation ...
> > The relationships are:
> > 25/225 =3D 11.11%
> > 40/225 =3D 17.77%
> > Increase =3D 17.77 - 11.11 =3D 6.66%
> > Same as 15/225 =3D 6.66%
> > Jeff
> >=20
> > -----Original Message-----
> > From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On=
 Behalf Of Jeff Whaley
> > Sent: Monday, March 09, 2009 12:35 PM
> > To: Rotary motors in aircraft
> > Subject: [FlyRotary] Re: 87 OCTANE MOGAS TEST (SOREL-TRACY, PROVINCE DE=
 QU=C9BEC, CANADA)
> >=20
> > The relationships are:
> > 25/255 =3D 11.11%
> > 40/225 =3D 17.77%
> > Increase =3D 17.77 - 11.11 =3D 6.66%
> > Same as 15/255 =3D 6.66%
> > Jeff
> >=20
> > -----Original Message-----
> > From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On=
 Behalf Of Bob White
> > Sent: Monday, March 09, 2009 12:06 PM
> > To: Rotary motors in aircraft
> > Subject: [FlyRotary] Re: 87 OCTANE MOGAS TEST (SOREL-TRACY, PROVINCE DE=
 QU=C9BEC, CANADA)
> >=20
> > Hi Yvon,
> >=20
> > My interpretation would be the 25 to 40 ml increase represents 15 ml of
> > alcohol.  That would represent=20
> > 15 ml alcohol / 200 ml fuel + alcohol =3D 7.5 %=20
> >=20
> > I've never actually done one of these tests, so if I've got it wrong
> > let me know. :)
> >=20
> > Bob W.
> >=20
> >=20
> > On Mon, 09 Mar 2009 10:58:42 -0400
> > Yvon Cournoyer <geryvon@videotron.ca> wrote:
> >=20
> > >=20
> > >     Yesterday I went to the Sorel airport and tested the fuel in my=20
> > > Zenith 90 liters tank.
> > >=20
> > >     This fuel already contains two stroke oil in the ratio of 1:130 p=
er=20
> > > volume.
> > >=20
> > > In a cylindrical ungraduated container I poured 25 ml of tap water an=
d=20
> > > added 200 ml of fuel
> > >=20
> > > After  1 hour and several vigourous shakings I observed an increase i=
n=20
> > > the volume of water to 40 ml
> > >=20
> > > The increase is about 4% (?)
> > >=20
> > > All quantities are approximate.
> > >=20
> > > Since I began running and flying my 1986 Mazda 13B engine, I have tes=
ted=20
> > > in flight all grades of mogas and also 100LL avgas. I would wait unti=
l=20
> > > my fuel level was very low and would fill my tank with the diff=E9ren=
t=20
> > > grade. Never detected a change in the performance of my engine. The o=
nly=20
> > > times I drew water from my fuel tank was when it was filled with 100L=
L=20
> > > avgas.
> > >=20
> > > Yvon Cournoyer.
> > >=20
> > >=20
> > > =20
> > >=20
> > >=20
> > > --
> > > Homepage:  http://www.flyrotary.com/
> > > Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary=
/List.html
> >=20
> >=20
>=20
>=20


--=20
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