As mentioned I have to retrieve the data lost when my drive crashed. The
report would be in an old email which I'm a pack rat about.
The exponent is similar to APCP because the AP drives that, the KP is what
drives the exponent so high. So traditional GALCIT formulations
which use KP run at chamber pressures above 2000 psi while the modified
asphalts with AP can burn stable below 1000 psi.
The Kraton modified asphalts are available from Paramount Asphalt Co. in
the central California valley. I got free samples of AC-5,10,20 & 40,
we used AC-10 which has intermediate viscosity properties so the pot temp
can be close to the boiling point of water and so a double jacketed cooker
can be used. It doesn't have a true melting point, like glass it's an non
crystalline amorphous solid.
You might find the AFRL report on line if you have the right search engine
but I'll try to retrieve it as soon as I can find it. I do have the report
by Chuck Piper
of conventional GALCIT with KP but I highly recommend the modified version
unless you specifically want the high exponent of KP.
https://www.rocketmotorparts.com/Asphalt_Based_Solid_Rocket_Propellants_by_Chuck_Piper/p1577809_17391641.aspx
Interesting. Any info on the process on start to finish? How about where
to get the asphalt products? What's the burn profile like? Can it be used
very easily in a moonburner or other besides bates? Any effects as far as
smoke or flame colors? Burn rate enhancers? Where can more info be found?
Does TRA allow these at research launches?
Appreciate your help
On Fri, Feb 26, 2021, 8:13 PM roxanna Mason <rocketmaster.ken@xxxxxxxxx>
wrote:
It's down in the 1/3"/sec range Ed with a similar burn rate exponent as
APCP propellants with equal to slightly higher ISP.
I love asphalt. It's a good hybrid fuel too with high regression rates.
I got the AFRL report just to find it. My computer hard drive took a dive
so I have to rebuild my database.
Thanks,
Ken
On Fri, Feb 26, 2021 at 6:58 PM Dr Edward Jones <RocketPioneer@xxxxxxxxx>
wrote:
Thanks a LOT, Ken. What's the typical burn rate and nominal Pc? And
would not KP in same granulations and oxidizer ratio be of good Isp,
with much faster burn rate?
How do AP and KP compare in terms of burn rate exponent n?