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What is that nozzle made of

How did you get a nozzle?

Dude you talk too much

Do you talk way too much

where the result? stop too much ass-hole talking!!! cant accept western brain type of work

Where do you get a nozzle from ❓ and other parts of the rocker.

Hi , I found your tutorial very informative and useful to me because i am also developing the same for the first time, I have one doubt and concern about the motor that Is it safe to use multiple motor grains (in your case it is four), the gap between them may result in sudden increasing in fuel surface area and rapid burnout and drastic pressure increase. Do you face same issues or it worked fine ? What do you prefer , single grain long motor of multiple grain motor like yours ?

I use a 120 volt 30 amp solid core 10 gauge copper wire to lite my rockets up.

You should do this in an oven. That is how I cook roux without burning the flour.

Beeing trying to use potasium nitrate and sugar mixed together with a very smal quantity of water. Mi mixure did not work. How much time would you expect it takes for the mixture to be fully dry and usable if any?

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You can CNC a negative CPC in aluminum and then nickel plate it. Pops off with an air hose. Optiform makes them. You can get many out of one mandrel. I’ve made some that are 3” diameter and 400 mm long. Diamond turned an aluminum mandrel in aluminum and NASA electroformed them in a thin shell of nickel. But they used liquid nitrogen to release the nickel shell.

Have you ever tried a profile for a nozzle that’s based on a CPC (Compound Parabolic Concentrator, or Winston Cone). These are used in optical systems to take 2 pi steradians input on the small end and convert it to +- theta on the large end. Theta being dependent on the design of the CPC. So if the thrust coming out of the rocket (before nozzle) is 2 pi steradians, you can design a CPC nozzle that converts that thrust to a smaller angle, effectively converting the sideways thrust more downwards. Just a thought. I like seeing how things from one field of science can be used in another field. A straight cone is ok, but a CPC would eliminate the need for the converging part of the nozzle before the pinch and reduce the overall length. I’ll try to find some CPC design references for you. Paul www.optiforms.com/compound-parabolic-concentrator-essentials/ link.springer.com/chapter/10.1007/978-3-030-76221-6_99 www.energy-proceedings.org/wp-content/uploads/2020/02/123_Paper_0510115102.pdf d3i71xaburhd42.cloudfront.net/ab6dafba0f8c2da22d8c1d4ca86cad2ac726544f/3-Figure2-1.png

Have you ever tried a profile for a nozzle that’s based on a CPC (Compound Parabolic Concentrator, or Winston Cone). These are used in optical systems to take 2 pi steradians input on the small end and convert it to +- theta on the large end. Theta being dependent on the design of the CPC. So if the thrust coming out of the rocket (before nozzle) is 2 pi steradians, you can design a CPC nozzle that converts that thrust to a smaller angle, effectively converting the sideways thrust more downwards. Just a thought. I like seeing how things from one field of science can be used in another field. A straight cone is ok, but a CPC would eliminate the need for the converging part of the nozzle before the pinch and reduce the overall length. I’ll try to find some CPC design references for you. Paul www.optiforms.com/compound-parabolic-concentrator-essentials/ link.springer.com/chapter/10.1007/978-3-030-76221-6_99 www.energy-proceedings.org/wp-content/uploads/2020/02/123_Paper_0510115102.pdf

Have you ever tried a profile for a nozzle that’s based on a CPC (Compound Parabolic Concentrator, or Winston Cone). These are used in optical systems to take 2 pi steradians input on the small end and convert it to +- theta on the large end. Theta being dependent on the design of the CPC. So if the thrust coming out of the rocket (before nozzle) is 2 pi steradians, you can design a CPC nozzle that converts that thrust to a smaller angle, effectively converting the sideways thrust more downwards. Just a thought. I like seeing how things from one field of science can be used in another field. A straight cone is ok, but a CPC would eliminate the need for the converging part of the nozzle before the pinch and reduce the overall length. I’ll try to find some CPC design references for you. Paul

👍

Love it!

Silicon powder, potassium perchlorate, trace of sulfur, some kind of binder. Silicon burns, becomes shower of molten glass bits. Glass is quite sticky when white hot, clings to fuel grain, ignition rarely fails.

Where did you get this thrust ring?

Can you make it and send it?

U could use a 10 ohm 1/4 watt resistor instead of nichrome wire

Why those glory hole😅

The candy propellant produces white smoke so you will never be able to produce a black smoke propellant that is usable in a motor I dont think. Best you can hope for is grey smoke. Also I think you miscalculated the addition if the glitter. You want that 10% to be part of the fuel load. For example if you use 25% fuel in your propellant mix then you need 75% kno3, 15% sorb and 10% glitter. the proppellant should burn cleaner with less residue. Also, the conditions under which the propellant is burning inside the combustion chamber are very different from those of the test strips. Not sure what useful info you will get from test strips.

hello, Thank you for sharing this video; it's really great! Do you happen to have any information or files regarding the dimensions of the entire engine? I'm interested in potentially fabricating one myself.

If you need pure pvc (or almost) you can look for liquid pvc in glue section at the hardware.

Steel safety wire also works like your nichrome wire did, for cheaper, if you are using a good power supply (ie: motorcycle batery).

The really small wires (like in cat5) strip easiest with a lighter.

How to make this fuel in hindi

Thanks for this.

Wonderful. can you share the drawing to my email?

without a propellant, can i just use a sparler and wrap some nichrome around the end to ignite, with the other end jammed into a rocket motor? every video goes into length about making your own starters. But is a sparkler enough heat to ignite a rocket?

I have a steel wok which is constantly rusting....soon as kno3 and sugar touches the metal....you can watch it change colour providing fuel with iron oxide...

What is the diameter of the motor?

Hi i tried using graphite. It doesn't create black smoke like aerotech engine but the smoke is darker and thicker for sure!

Hi i'm thinking using classic PLA filament for grains. Did your try it?

Hello...Greetings Minute Rockets. I just wanna ask a question that, I am trying to make a blackpowder igniter for my rocket motor with BATES-neutral burning grain with a Maximum operating pressure of 934psi (targeted).Do I have to use the amount of BP such that the pressure generated by the hot combustion gases of the BP will be in range of max operating pressure of the motor (For Startup phase) ?

I'm a bit of a stickler when it comes to formulas. With that said, your percentages total 101%. What I have done, is remove 1% of Kno3 replacing with the 1% of Red Iron Oxide. Is it a huge difference? Maybe, maybe not, but makes more sense to me, than 101% Subscribed!

what was added for such a color?

Looks absolutely stunning ! Are you planning to make APCP motors ?

Hi, why do you use sorbitol? And not icing sugar or fructose or glucose!? I am curious to know why, ( i am still a noob) please. Thank you! 👍😉

soldering -- sole der ring

Can someone give me the right wight on the 3 thing used here

KNSB is amazing, isn't it?

awesome)

O very nice thank you sir

any chance we can get this excel book ._.

How did you make the nozzle and the rocket launcher?

Very helpful

Why not chuck the bar in the lathe and use a parting tool to get the lemgth you need

Instead of keeping these igniters in a carefully controlled (jar with desiccant) environment, I'd try sealing the sugar based coating from the humidity by painting/dipping them in a flammable lacquer, like fingernail polish, or the glue used for PVC piping. That way they could be stored without concern for the hydroscopic nature of the original coating.