Richard, does this formula HAVE to have atomized steel powder? Can it be
substituted for aluminum powder? I have 200# and dark pyro and a sparing
amount of mgal. I do have steel powder but I got it from a surface grinder.
On Thu, 23 Sep 2021, 15:43 Richard Nakka, <richard.rocketry@xxxxxxxxx>
wrote:
Hi Nikolai, as this is a sugar propellant discussion list, I'll keep this
message 'on topic' by mentioning that sugar motors are my main interest,
and occupy much of my "research time". Lately though, I have been dabbling
with AP propellants to broaden my rocketry horizons. As such, I've
developed an APCP that I rather like and have had good success with. It
uses epoxy as a binder. But not just any epoxy, if *must *be the
"two-equal part" type that is used for coating table tops (in lieu of
varnish) and similar applications. There are a number of different brands
available on Amazon. I have used NuLustre and will be testing "New Classic"
soon.
https://www.swingpaints.com/product/1555/Circa-1850-NU-LUSTRE-55
https://www.newclassic.ca/collections/epoxy-resin
The formulation is:
AP 67.8%
Epoxy 25%
iron (atomized) 7%
lampblack 0.2%
The propellant is relatively slow burning, giving a 2 second burn for a
38mm motor. I can provide more info such as AP particle size and burn rate
parameters if you are interested.
Richard
On Wed, Sep 22, 2021 at 4:11 PM Nikolai Nielsen <
nielsen.nikolai86@xxxxxxxxx> wrote:
hi, ill soon have a fair amount of AP made via electrolysis of sodium
chloride and would really like to have a fuel that I can make without the
specialist resins like HTPB. Does anyone have a recipe for a polyester
resin or another EASILY ACCESSIBLE resin? I'd ask about epoxy but it seems
that there is so much variance with epoxies between brands that finding one
like yours may take a lot of resin buying to figure out. worth trying tho.
any other AP recipes would be appreciated, I am currently experimenting
with silicone sealant but the amount of stiff ash it produces has me
worried.
Many thanks,
Nikolai Nielsen
