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For the most part this seems to be the case. For something like paraffin you usually have the opposite problem as Paraffin's ideal O/F ratio with nitrous for example is like 9:1, but it regresses extremely quickly. For Oxygen, the regression rates are usually faster than with N2O so it somewhat...

Regarding this regression rate is only important to an extent, the extent being that you can have a compact and volumetrically efficient grain that achieves the optimum O/F ratio. With nitrous at least you're generally talking about optimum O/F ratios between 7 to 9, so regression rates don't...

As a bonus, here is a firing with a 3D printed matrix (concentric rows of rings that were later packed with powdered anthracite coal. It had some of the highest performance seen in any of the tests we ran (196 seconds), but given you can see the black cloud of coal at startup I'd venture to...

Delrin is a difficult material to print. The point at which it melts and can be deposited is very close to the point where it starts to degrade, so you need very precise temperature control (i.e. an enclosure), and even if you have that it prints at a relatively high temperature. UTK has used...

Happy to hear this. Hopefully they'll approve the regular canisters.

The micro-hybrids can be cheaper and easier not just because of size but also because you don't need any GSE for filling the tank. Problem is most micro-hybrids use steel whippet cartridges, which can't be flown at TRA launches even as an experimental motor, and it can be hard to track down the...

More so light is an electromagnetic wave/particle.

Hey Matt, fancy seeing you here. I'll try and give you a discord call later today.

A stable rocket will turn to minimize angle of attack. Unless there is no wind, you will have some non-zero angle of attack and the rocket will pitch over in response.

General process is to scrub with a strong de-greaser like simple green, rinse in de-ionized water and then finish with isopropyl alcohol (so it evaporates and the part doesn't stay wet). Just soaking a part in a solvent doesn't mean when it evaporates that it'll take the contaminant with it. You...

My ideal feature list in order of preference: Moment of inertia override for matching measured MoI from swing tests Power-on Cd corrections similar to RASAero that will work either with an input nozzle exit diameter or the exit diameter field already in .RSE files Built-in fin...

This depends on whether you are at a low/mid power or high power launch. For high power flights I'd venture to guess the percentage of shreds vs dislodging or snapping a fin on landing is significantly higher than for low/mid power. In general, the faster you fly, the more likely you are to...

Are you using Xbee or LoRa for communications?

Teflon is the standard, but really for gasses you want something called oxygen tape. It's still teflon, but you'll usually see it dyed green and it's a higher quality/density teflon...

My opinion: What you are seeing is almost certainly un-burned material being shot out of the nozzle. Even in professional motors some of the fuel does not react, and most of the time solid propellants are burning a bit fuel rich just due to the fact that you need extremely high concentrations of...

Nuclear arsenals are a case of use it or lose it. You use even a tactical nuclear weapon against another nuclear power and odds are high they will retaliate in-kind, which would require immediately using your remaining arsenal or having them become targets for retaliation. The concept of...

Very high. Lithium deuteride has been in use since the Castle Bravo test, and almost certainly was adopted by the Soviets. Them doing things the "quick and dirty" way means safety oversights (Chernobyl, etc) and espionage (the Rosenbergs for example), it by no means implies they didn't do...

I was under the impression tritium wasn't directly used in most modern weapons, but instead lithium deuteride that broke into deuterium helium and tritium when exposed to neutrons from the primary.

I mean, France has one of the most powerful militaries in the world and something like the third or fourth largest nuclear arsenal (depending on whether you count total warheads or deployed warheads). Only reason they fell so quickly in WWII was the overwhelming success of German Blitzkrieg...

I haven't tried it, but now I am curious. On one hand hybrid exhaust tends to be significantly less abrasive than solid exhaust, but on the other hand it tends to be an oxidizer rich exhaust that may just turn the nozzle into fuel.