Awesome job! I interested in what type of silicone your using, is it a
single part silicone line caulk or a two-part casting silicone.
On Fri, Aug 5, 2022 at 1:40 PM 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
