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Hi Jeff,
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 = 6%, or use 100 ml of
water ant you get 15 ml / 300 ml = 5%.
Isn't the question - what is the percentage of alcohol in the fuel?
Bob W.
On Mon, 9 Mar 2009 09:38:06 -0700
Jeff Whaley <jwhaley@datacast.com> wrote:
> Sorry double typos ... just got back from vacation ...
> The relationships are:
> 25/225 = 11.11%
> 40/225 = 17.77%
> Increase = 17.77 - 11.11 = 6.66%
> Same as 15/225 = 6.66%
> Jeff
>
> -----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 QUÉBEC, CANADA)
>
> The relationships are:
> 25/255 = 11.11%
> 40/225 = 17.77%
> Increase = 17.77 - 11.11 = 6.66%
> Same as 15/255 = 6.66%
> Jeff
>
> -----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 QUÉBEC, CANADA)
>
> Hi Yvon,
>
> My interpretation would be the 25 to 40 ml increase represents 15 ml of
> alcohol. That would represent
> 15 ml alcohol / 200 ml fuel + alcohol = 7.5 %
>
> I've never actually done one of these tests, so if I've got it wrong
> let me know. :)
>
> Bob W.
>
>
> On Mon, 09 Mar 2009 10:58:42 -0400
> Yvon Cournoyer <geryvon@videotron.ca> wrote:
>
> >
> > Yesterday I went to the Sorel airport and tested the fuel in my
> > Zenith 90 liters tank.
> >
> > This fuel already contains two stroke oil in the ratio of 1:130 per
> > volume.
> >
> > In a cylindrical ungraduated container I poured 25 ml of tap water and
> > added 200 ml of fuel
> >
> > After 1 hour and several vigourous shakings I observed an increase in
> > the volume of water to 40 ml
> >
> > The increase is about 4% (?)
> >
> > All quantities are approximate.
> >
> > Since I began running and flying my 1986 Mazda 13B engine, I have tested
> > in flight all grades of mogas and also 100LL avgas. I would wait until
> > my fuel level was very low and would fill my tank with the différent
> > grade. Never detected a change in the performance of my engine. The only
> > times I drew water from my fuel tank was when it was filled with 100LL
> > avgas.
> >
> > Yvon Cournoyer.
> >
> >
> >
> >
> >
> > --
> > Homepage: http://www.flyrotary.com/
> > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html
>
>
--
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