This is the annular injector that was posted about in the Hybrids 2017 thread.
The injector is 75mm with two o-rings grooves, the nitrous port is tapped for 1/4 NPT and it has a chamber pressure port that is tapped for 1/16 NPT. I'm including a plug for that if you don't want to use it. The injector face I've clean a bit, but it could use a good scrub or if someone had an ultrasonic cleaner that might work as well. It's cosmetic, as all the passages for nitrous are clean.
High Flow
Lower Flow
Injector housing, injector, snap ring and two o-rings
Top of injector showing 1/4 NPT tap and 1/16 NPT chamber pressure tap with 1/16 NPT plug
BUT WAIT, THERE IS MORE!
Also included is the complimentary nozzle that is sized for this injector. It has a 5/8" throat. There are two dings in the nozzle shoulders, but does not effect the performance. The nozzle also has a bit of entrance cone erosion - this nozzle has 10 tests on it and a few of them were high metals.
Nozzle showing chip on shoulders from entrance cone side
Nozzle showing exit cone side
BUT WAIT, THERE IS MORE!
The nozzle comes with the nozzle washer that was used for the firings
BUT WAIT, THERE IS MORE!
The injector and nozzle ALSO come with the test case (3.00") and two snap rings that were used.
THAT'S RIGHT, THIS HERE IS A COMPLETE HYBRID MOTOR CASING! YOU SUPPLY YOUR OWN PRE-FILLED NITROUS OXIDE TANK AND LET THOSE HORSES RUN!
Complete 3.00" Test Motor
A couple things to note about this motor. The inside of the casing is a bit gunky - nothing that will keep the nozzle and injector from sealing, but right above the nozzle. Plexiglass/Polycarbonate did this. One good firing and cleaning while it is warm will get rid of all the gunk. This is a test motor - it does not have a thrust ring groove machined in one end of the case AND the motor is a true 3.00" outside diameter. Additionally, the liners used in this motor were 2 3/4" x 1/8" wall polycarbonate/plexiglass tubing. The injector and nozzle have shoulders that reflect this.
This motor runs best on around 2 pounds of nitrous oxide. A good fit is a 24 oz or 32 ounce CO2 tank with a valve and adapter to the tank. I used
THIS style of valve that was servo actuated from an Arduino. You should decide what you want to do.
As far as liners, I'll machine some 2.5" SCH 80 PVC to fit the case and the shoulders for an additional cost.
I'm asking $125, including shipping to the USA. Liners would be extra and would have a shipping charge.
Here is the video of the first test of the motor
[video]https://youtu.be/gh_lxh5dY0Y?t=1m21s[/video]
Edward