Well I guess I worked those out whenever turning everything to percentage!!!
Just round them up.
De : sugpro-bounce@xxxxxxxxxxxxx [mailto:sugpro-bounce@xxxxxxxxxxxxx] De la ;
part de flint hapirat ("flinthapirat")
Envoyé : 18 August 2022 16:55
À : sugpro@xxxxxxxxxxxxx
Objet : [sugpro] Re: AP silicon propellant success!!!
Congrats Boris! Nicely done!
How do you weigh all those fine numbers after the decimal point... ? :)
Cheers, Flint http://www.pyrosystems.com/flint/
On Friday, August 5, 2022 at 10:40:29 PM GMT+3, Boris du Reau
<boris.dureau@xxxxxxx> wrote:
Hello all
My friend Philippe and I have finally had success with AP/Silicon and
PP/silicon propellant after testing over 50 formulations and blowing up 5 or 6
casings and a teststand!!! We tested over 3 different silicones before finding
the right one. We ended up using a 2 part silicon normally used for making mold.
We now have an easy to make, easy to ignite propellant (just an ematch is
required most of the time!!!)
I have done quite a few ground test and I have flown a 2 grains 38 mm from
Philippe (https://www.dr-cluster-rocketpropulsion.com/shop) a couple of time
with success
https://www.youtube.com/watch?v=HdmF5ZgMZDQ
The key to avoid blowing up your casing is to use lamp black.
Potassium perchlorate is a lot more challenging because it is really fast, I
have done some ground test, I will post some more videos and will publishing
the full results with the compositions for both AP and PP
The base composition that we are using with our composite silicone is :
AP or PP 72.74539113
lamp black 0.332170736
silicone 1 24.23185517
Silicone 2 2.69058296
Still need to do some measurements on the test stand (both casing pressure and
thrust)
I am also trying to add colours
The only down side that we have is that our silicon does not dry when using
carbonates (barium, calcium or strontium) so we will have to use nitrates only
to color the flame
Regards
Boris
