Hybrid motor development and static testing information/legality

Discussions on hybrid rocketry including rockets, motors and technologies.

Moderator: Moderators

Rocketer01
Rocket Onlooker
Rocket Onlooker
Posts: 3
Joined: Sun Jun 20, 2021 11:25 pm

Hybrid motor development and static testing information/legality

Postby Rocketer01 » Sun Jun 20, 2021 11:28 pm

I have been reading Rocket Propulsion Elements 8th Edition recently and have developed an interest in the use of hybrid engines. I am thinking about the prospect of developing a small gaseous N2O/Solid grain engine that I could use one day in a flight.

I have a pyrotechnics license, my L1 and understand that you need to be L2 certified (which I plan to get apply for the next suitable flight event) to fly a HPR rocket which utilises a hybrid engine and its needs to be a research event. However, I cannot find anything on the legality of constructing such a motor and eventually conducting static tests? (only info of the use at a launch).

Any insight into this is highly appreciated.

Rocketer01
Rocket Onlooker
Rocket Onlooker
Posts: 3
Joined: Sun Jun 20, 2021 11:25 pm

Re: Hybrid motor development and static testing information/legality

Postby Rocketer01 » Sun Jun 20, 2021 11:35 pm

Side note, I'm in NSW

User avatar
Voyager
Rocket Crew
Rocket Crew
Posts: 223
Joined: Mon Jan 04, 2010 10:00 pm

Re: Hybrid motor development and static testing information/legality

Postby Voyager » Mon Jun 21, 2021 8:32 am

Fellow forum member strud can probably help out with these questions. Also read up on Tripoli’s experimental/research launch requirements.

For further technical information check out http://www.aspirespace.org.uk/.
TRA 14574 L2

drew
Southern fried goodness
Southern fried goodness
Posts: 1092
Joined: Sat Aug 01, 2009 10:20 pm
Location: Perth

Re: Hybrid motor development and static testing information/legality

Postby drew » Fri Jul 02, 2021 7:22 pm

Hi Rocketeer01,

Voyager is correct in terms of Strud being able to help with hybrid questions. With that said from an Australian legality/regulation perspective hybrids basically don't exist. So, from my understanding, there's nothing in Australian legislation that bars you from constructing and static firing a home made hybrid motor. There's been active home made hybrid development in Australia off and on for over 20 years? Troy could probably speak to this as well, along with PK.

Cheers,

drew
Andrew Hamilton
AMRS 28 L3
AMRS Records Committee Chairman
Max Alt AGL - 26,850ft - L935 - THUNDA 2019
Max V - 3,004 ft/s, ~Mach 2.67 - L935 - THUNDA 2019

PK
...
...
Posts: 1728
Joined: Sun Jun 01, 2008 5:07 pm
Location: Perth
Contact:

Re: Hybrid motor development and static testing information/legality

Postby PK » Fri Jul 02, 2021 11:38 pm

If nothing goes bang, then the only regulatory issues relate to the manufacturing of pressure vessels. All states have regulations regarding this. NSW's are actually pretty sensible. There's a risk factor which is a function of the volume of the vessel, the operating pressure, and what's in it. That factor determines the level of compliance for the thing, small hybrids tend to drop off the bottom of this scale.

Make no mistake though. If it goes bang, and gaseous NOX goes bang (and is a poor choice of oxidiser as a result), or someone complains. There will be no shortage of regulation that will be brought to bear.
PK

I'm awesome!

Rocketer01
Rocket Onlooker
Rocket Onlooker
Posts: 3
Joined: Sun Jun 20, 2021 11:25 pm

Re: Hybrid motor development and static testing information/legality

Postby Rocketer01 » Sat Jul 03, 2021 11:55 am

Thanks allot everyone for the replies, I will take all of that into consideration and the legality explanation makes a lot of sense. I will start looking into the pressure vessel legislation and see what needs to be done. I will also remember to get in contact with Strud if I come across any problems in the future. Thanks again.

Kryten
Astronaut
Astronaut
Posts: 2012
Joined: Wed Oct 24, 2007 11:06 am
Location: Sydney

Re: Hybrid motor development and static testing information/legality

Postby Kryten » Sat Jul 03, 2021 8:31 pm

Also: "Cases (including hybrid cylinders), front and rear closures, and nozzles shall not be fabricated of steel or other frangible materials (e.g. PVC)."
(extract from Tripoli Safe Launch Practices)
"Pub, ah yes. A meeting place where people attempt to achieve advanced states of mental incompetence by the repeated consumption of fermented vegetable drinks" (“Timeslides”)


Return to “Hybrid - Crossbreeding Rocketry”

Who is online

Users browsing this forum: No registered users and 3 guests