Jack,
I'm happy to share details around the small (2") hybrid that I've been
building, but give me some time to put some details together. What detail
works best for you (descriptions, dimensioned drawings, pictures etc)? I
use graphite nozzles inset in phenolic and I use something similar to a UC
valve type injector, but I don't have a floating valve like most commercial
motors. I use a separate tank for the N2O, so the nozzle can be pointed
up, as well as the tank vent. I use 3D printed ABS fuel grains. The test
below uses a solid ABS grain but I've since started filling grains with a
PBAN mixture (all the recent talk of asphalt might get me to switch).
Here's the most recent test: https://youtu.be/tqLjWhM3kv8
Joe
On Fri, Jul 17, 2020 at 10:10 AM Jack Hanna <jackhannaofficial@xxxxxxxxx>
wrote:
Awhile back I asked this forum if anyone here has information on nitrous
oxide hybrids, and from all the info there and other info I have found just
about enough info to get an idea for the general design of my engine, which
will be gaseous nitrous oxide fed through a showerhead style injector into
a tube of moulded paraffin carbon black mixture, out through a standard
nozzle. If it works, I would like to try and create a UC valve type
injector, which uses ACPC fuel grain on an E Match to light the fuel and in
the process release the oxidizer flow, which may be as simple as plugging
up the oxidizer hole, or having a small pinhole be able to vent enough
oxidizer to sustain combustion.
What i'm mostly curious about is the actual design and manufacturing of
the engine, as this other forum I have grabbed info from is mainly pushing
me to buy commercial rocket casings and parts, however given I think I have
access to all the tools I need to make a full motor, i'm hesitant to spend
more money than I need on parts I could just make myself. I also honestly
just want the fun of designing and creating everything from scratch.
So, that being said. How do people manufacture hybrids? I've heard
graphite as a nozzle is effective, however it's also extremely porous, and
I'm hesitant to use it as a unibody design for the main combustion chamber
and injector. I would very much like it if someone here who has either
built their own or knows of any detailed papers telling of the
manufacturing of the body of the motor. I know of Nakka, and that will be
extremely useful to start manufacturing once I have the ability to get back
into my school's shop.
Thanks!