Tiny Liquid Test #7

This was the 7th static test attempt of my Tiny Liquid rocket. It is a RATTWorks / Half Cat style liquid built out of a Cesaroni 24mm 6 grain case.
The previous successful test is here: • Nitrous Kerosene Liqui...
This test used a longer combustion chamber (L* of ~10") and a larger propellant load. The specific impulse on this test came out to ~125 sec, much better than the ~79 sec the shorter chamber got.
(I initially had a spreadsheet error, these are the corrected numbers)
Propellant: Nitrous Oxide and D40 Kerosene
Motor Designation: F28
Isp: 125 sec
O/F 4 ish
Propellant Mass: ~39 grams
Total mass: ~200 grams

[@1kuhny]

The increase in individuals making or even just attempting to make a liquid rocket engine makes me very happy.

[@r0cketplumber]

Yes, it's cool to see the next generation doing original work. Well done!

[@davidrichter57]

Those little mach diamonds are the perfect counterpart to the enormous compound mach diamonds of Starship OFT-2. Gorgeous.

[@ijarbis187]

That’s awesome! It looks like the nozzle is a bit over-expanded, but the shock diamonds you get from that is sick

[@jeffmorrison5834]

A lot of work behind the scenes on this short clip. Way to go man, this is impressive!!

[@KegRocket]

This is BIG!

[@zyeborm]

It doesn't suck before now it's friggin amazing

[@yeahright3348]

Thanks for sharing, it great to see people share their passion and successes.

[@mf1ve]

Looking forward to first flight!

[@drockjr]

No idea why this is recommended, however, someone achieved a nice thrust. This was neat. An artist is behind the scenes it seems.

[@Cfbrolley1320]

This is seriously cool. do you have any more pictures or a write-up somewhere? I'd love to see if I can make something similar for a mini hybrid casing one day!

[@DTHRocket]

Cool! It's so

[@likemac2000]

That’s epic

[@SynthRockViking]

Next step is fins, and telemetry ☝

[@seventeenshaun6424]

What is the expansion ratio for that nozzle? Those are some pretty good shock diamonds.

[@TurbulentSphere]

It's about 3. I had the keep the chamber pressure low so the throat would be big enough for the fill tube and igniter wires to fit.

[@pirobot668beta]

!

[@multiengineering8982]

What is. That leaking. Gas. Is. How. The. Vulve. Is. Work

[@mojaverockets]

As seen at 0:15 ? That is a small orifice at the top of the nitrous tank. When filling the tank from the bottom using the nitrous hose up the nozzle, you need a vent to expel the vapor. When you start to see liquid squirting out, that means your tank is full.

[@user-ow8qt3zp7s]

Flame Holder of Baffle type?

[@TurbulentSphere]

No flame holders or baffles. It is a single element shear coax injector (fuel centered).

[@khlchs2231]

U call this fireworks a rocket engine?

[@shawntootill24]

You're completely ignorant.

[@villain636]

where can i contact you?