2" x 24" Aluminum rocket motor test fire

[ed563]

what type of propellant did u make, sugar/kn03?

[oXFalconXo]

What was your propellent? lol

[AnshopDeTl]

wenn ihr zündfertige rauchbomben kaufen wollt dann schaut euch doch mal unser viedeo an sucht einfach Ammoniumnirat,KAS,Rauchbomben

[iSOisoleucine]

You shouldnt do this at home. They have factory made rocket engines for a reason...

[sempertard]

@iSOisoleucine in all the wrong designer colors.

[iSOisoleucine]

@sempertard Huh. Haha. Anyways, there is something called experimental rocketry but AFAIK, I don't think its this low...

[sempertard]

@iSOisoleucine you make do with what you have. I took the Wickman motor course twice. Did all the math, overbuilt the motor to withstand >3 times peak chamber pressure. Built a containment vessel that could easily handle any explosion. Fired up my laptop with A/D hardware hooked to a 1500 PSI transducer and watched my careful work fall right into the precalculated expectations. And managed to do it all minus the white lab coat, and deluxe accommodations. But thanks for playing.. Cheers.

[iSOisoleucine]

@sempertard I guess so. Well, at least it works. Congrats. And yes, do be careful.

[Punchcatface]

that blue rigging you have set up holding the rocket, is that also your scale?

[sempertard]

@Punchcatface No it's a huge thick chunk of PCV gas pipe for protection. In case the motor cato'ed.

[urosh911]

Nice powerful long duration motor....good job !

[mybiz42]

what kind of propellant was that???? that was auwsome!!!!!!!

[stooncol619]

fantastic but what is the component of the fuel i will be greatfull

[shriramvenu]

your exhaust looks under expanded

[pevargas]

@shriramvenu

You are correct, in most cases the expanded plume would be an indication of underexpansion but ammonium nitrate composite propellants create that fireball no matter what; it is a phenomenom that is not well understood.

[sempertard]

@shriramvenu I can assure you the exhaust was coming out of the nozzle at mach.

[siliciumsilicium]

what is the composison of the fuel???

[Fieldleaf]

Is the nozzle also made of aluminium or is it made from Graphite or steal?

[sempertard]

Graphite

[liudas559]

cool how you skype?

[fantactical]

what are youre ingredients to make this ...

[ProJoe559]

wat did u use as a fuel?>

[sempertard]

60% ammonium nitrate, 20% magnesium powder, 20% R20LM HTPB binder.

[airgunsniper]

was that an end burning grain or a core burner?

[sempertard]

Core

[Dragonsintuxcedos]

Wait... didn't the title say "Aluminum" not "Magnesium"?!

[sempertard]

the casing is aluminum, the propellant fuel is magnesium powder. Aluminum powder can be used for the propellant fuel, however Ammonium Perchlorate must be used as the oxidizer.

[bktech333]

i always thought ammonium perchlorate was to slow burning

[pevargas]

Ammonium perchlorate composite propellants (APCP) burn faster than the ammonium nitrate composite propellant (ANCP) shown here. APCP is what high-power-store-bought motors use. ANCP is homemade. Advantages: safe, non-toxic, low combustion temperature (your graphite nozzles last a long time). The ISP (force x time of burn divided by pound of propellant) is about 90% of ANCP but who cares. 60% AN, 20% HTPD binder and 20% 20 micron magnesium (by weight) is typical. Look at John Wickman's site.

[gordonshart]

What is R20LM HTPB? polyurthane

[sempertard]

Hydroxyl-terminated polybutadiene

[Jbdewalt]

Hooray for the unsung heros of industrial technology - the backyard scientists doing independant reasearch without Gov/industrial market influneces. This is where the real human evolution takes place. Nice test fire - lets build a ship and get away from all these fools.

[RicardoGarciaPino]

communist

[sempertard]

No. Rastafarian.

[bktech333]

nice