Fuel Weights?

[Gray E Fowler]

Brain has this dead right.  The fuel guys, if the have half a brain will 
always mix by weight OR choose to temperature control their stock-and that 
is not so easy. Ever try to cool or warm 1000 gallon tank of methanol? So 
they (should) mix by weight and then for those of you who NEED volume do 
the math and there it is. Any fuel guy blending by volume without temp 
control will have a product that varies, and then complaints from users 
like us who actually check performance on a regular basis.



Gray Fowler
Principal Chemical Engineer
Composites Engineering




Brian Young <b4598070 at yahoo.com>
Sent by: discussion-request at nsrca.org
08/27/2003 08:04 AM
Please respond to discussion

 
        To:     discussion at nsrca.org
        cc: 
        Subject:        Re: Fuel Weights?


The specific gravity of Nitro is 1.36, Alcohol is
0.79, and castor oil is 0.96. Multiply by the density
of water, 1000g/l will give you the weight per liter.
(I used castor since it was the only specific gravity
I could find on the web.)

For 15% nitro, 18% oil balance alcohol I got 7.4 lb
per gallon. Sound about right?

Mix by volume vs. by weight could result in slightly
different mixtures; if the temperature changes the
density of the fluids changes. So it depends what rate
each fluid expands at on how much the mixture might
change. Mixing by weight could be more consistant.
Anyway thats how I see it.



--- Bob Pastorello <rcaerobob at cox.net> wrote:
> So do we want 'em to mix by VOLUME or by WEIGHT ?
> Which means more?  (Better yet, which is BETTER???)
> 
> Bob Pastorello, Oklahoma
> NSRCA 199, AMA 46373
> rcaerobob at cox.net
> www.rcaerobats.net
> 
> 
>   ----- Original Message ----- 
>   From: Rcmaster199 at aol.com 
>   To: discussion at nsrca.org 
>   Sent: Tuesday, August 26, 2003 7:25 PM
>   Subject: Re: Fuel Weights?
> 
> 
>   No, no he's right. NOMe is the densest component
> of fuel. A volume measure that 
>   corresponds to 15% (by Vol), weighs more than 15%
> (by weight) of the fuel weight . It's right Bob;
> think about it
> 
>   matt k
> 
> 
>     Subj:Re: Fuel Weights? 
>     Date:8/26/2003 7:45:13 PM Eastern Daylight Time
>     From:rcaerobob at cox.net
>     Reply-to:discussion at nsrca.org
>     To:discussion at nsrca.org
>     Sent from the Internet 
> 
> 
> 
>     uhh...don...you Drinkin' your nitro? <G>
>     We *think* you meant "....than by weight" ?
> 
>     Bob Pastorello, Oklahoma
>     NSRCA 199, AMA 46373
>     rcaerobob at cox.net
>     www.rcaerobats.net
> 
> 
>     ----- Original Message ----- 
>     From: <AtwoodDon at aol.com>
>     To: <discussion at nsrca.org>
>     Sent: Tuesday, August 26, 2003 6:42 PM
>     Subject: Re: Fuel Weights?
> 
> 
>     > In a message dated 8/26/2003 6:40:50 PM
> Eastern Daylight Time,
>     rcaerobob at cox.net writes:
>     >
>     > > Update....here's my own measurements;
> proving only that nothing is the
>     > > same....
>     > >    Ritche's Brew -
>     > >        10%   7 # 4.9 oz
>     > >        15%   7 # 4.0 oz (other 15% gallon is
> 7 # 3.9 oz)
>     > >        20%   7 # 11.7 oz....
>     > >
>     > > So whoever proposed jug weights to be
> meaningful (was that ME???) knows
>     that
>     > > it's too widely variable (I think someone
> already said that)...
>     > >    Interesting exercise, though.  Guess I
> better get a
>     > > graduated
>     > > cylinder...
>     > >
>     > > Bob Pastorello, Oklahoma
>     > > NSRCA 199, AMA 46373
>     > > rcaerobob at cox.net
>     > > www.rcaerobats.net
>     >
>     > As Verne pointed out, nitro is probably the
> heaviest component in the mix.
>     To further confuse matters, some manufactures
> (few) mix the fuel by volume
>     (ie 15% nitro means 15% by volume) where other
> manufactures mix by weight
>     (ie 15% nitro means 15% of the weight is nitro).
>  Obviously, the ones that
>     mix by volume have more nitro in their 15% fuel
> than the ones that mix by
>     volume.
>     >
>     > Don
> 
> 
> 


=====
Brian Young
Tulsa
b4598070 at yahoo.com
918-745-6046h
918-838-0900w

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