Right C:B Ratio For Aerosol
Posted: Tue May 01, 2012 9:22 pm
like the title says what is the correct C:B ratio for a Aerosol like engine starter i keep hearing .8:1 is then 1.5:1 is correct. Which one is it?
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Posted: Wed May 02, 2012 12:22 am
For "spray and pray" launchers where the mix is a bit hit and miss, 1.5:1 is the accepted ratio. If you want more power and more reliability, consider letting the lord syringe fuelling into your life
Posted: Wed May 02, 2012 4:25 pm
There is no such thing as the "correct CB ratio". 0.8 is generally the most efficient (but efficiency really is not important). 1.5 is a good trade off between performance (what you care about much more than efficiency) and chamber size.
But for a spray and pray none of that matters. The gun'll suck and the performance will blow.
But for a spray and pray none of that matters. The gun'll suck and the performance will blow.
Posted: Wed May 02, 2012 7:50 pm
Wel than what is an ideal barrel and chamber size for spray and pray. The reason I went with a spray and pray is the ease of design and build. So what's the best camber length 3" and barrel length for 2.5"?
Posted: Wed May 02, 2012 11:44 pm
What jimmy was trying to say is that by going down the spray'n'pray route, you're basically saying "Fuçk proper air:fuel mix ratios, I'm letting fate decide!", so then worrying about correct C:B ratio seems a bit redundant.rustlerdude987 wrote:Wel than what is an ideal barrel and chamber size for spray and pray.
The good old ordering-a-massive-triple-stacked-bacon-wrapped-grease-dipped-mega-burger-then-taking-a-diet-soda-with-it analogy
If you want to maximise performance and reliability, meter your fuel properly. It doesn't add complexity to the build to fuel with a syringe.
Posted: Sat May 05, 2012 12:26 pm
actually now that i look at this this seems really easy but i have one question is the ideal butane concentration always 3%
Posted: Sat May 05, 2012 12:38 pm
Sort of. It depends on how you fuel. Technically a stoichiometric mix is either 3.12% or 3.22% depending on if the added fuel displaces air from the chamber (3.12%) or not (3.22%).
A very slightly rich mixture contains a little less energy but generally burns a little faster.
A very slightly rich mixture contains a little less energy but generally burns a little faster.
Posted: Sat May 05, 2012 4:50 pm
so its that simple just find how much volume you have after the projectile is put in and multiply it by 3.22%
Posted: Sat May 05, 2012 7:19 pm
Yep. With a syringe you would use 3.12%, for a meter pipe pressurized fuel 3.22%.
Posted: Sat May 05, 2012 7:22 pm
perfect thanks for the help guys!