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 hadsuccess with AP/Silicon and PP/silicon
propellant after testing over 50formulations and blowing up 5 or 6 casings and
a teststand!!! We tested over 3different silicones before finding the right
one. We ended up using a 2 partsilicon normally used for making mold.
We now have an easy to make, easy to ignitepropellant (just an ematch is
required most of the time!!!)
I have done quite a few ground test and Ihave 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 isto use lamp black.
Potassium perchlorate is a lot more challengingbecause it is really fast, I
have done some ground test, I will post somemore videos and will publishing
the full results with the compositions for bothAP and PP
The base composition that we are using withour 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 thetest stand (both casing pressure and
thrust)
I am also trying to add colours
The only down side that we have is that oursilicon does not dry when using
carbonates (barium, calcium or strontium) so wewill have to use nitrates only
to color the flame
Regards
Boris
