KNO3 sorbitol propellant

[parthct]

I've made recrystallized propellants with a variety of fuels, and personally, I'd say Sorbitol works great (if not the best) with the traditional R-Candy method. Right around 110-130 degrees it is just like play-doh, and you can make into any kind of grain you want without the mess (IMO) of pouring. Wait 10 minutes and your motor is 100% hardened and ready to go. Oh and the best part is you can always bring it back to the playdoh state by simply raising the temperature!! Just my two cents...

[donperry1]

I realize that the melted method creates alot of sparks (clumps of burning fuel) as opposed to the recrystallized method which is pretty smooth.

[hawk1buster]

Has anyone seen AZRon34 on youtube? well have a look at his 5sec. video that will make you rethink any formula you can dream up!

[hawk1buster]

Ok but what the hell is SORBITOL, i'm sure it can be bought from Ebay.....but what is it???

[randyclar747]

Where the hell do you get sorbitol?

[Lightning3522]

@randyclar747

great question, i am still trying to figure this out

[roboticmehdi]

From the performace view, whic one do you think is the best , KNSU or KNSB ?

[brainiac777]

I have been using KNO3+sugar for ages and got terrible results. My rockets went no more than about 3 metres. I would like to make fuel using sorbitol but can't find anywhere in the UK that sells it, even online.

[kjbrbbb]

where can you get sorbitol?

[shriramvenu]

what about more potent oxidisers like say ...sodium chlorate/perchlorate... anyone use those instead of KNO3?

[lonestar1775]

Where can i buy sorbitol other than the internet? Also is it the same as sweet and low or Splenda?

[TheCommieslayer]

could normal sugar be used instead of sorbitol

[justapyrorocketeer]

Of course. You need to look up R-candy for this formula. It is created in a different manner than the propellant in this video. R-Candy is the most popular sugar based propellant. There are ways in which you can melt the table sugar in the same way that i melted the sorbitol but these methods are very difficult and the end result usually is very brittle. I recomend either this method or the R-candy method

[TheCommieslayer]

thanks

[123samic]

im a fan

[FarinUrlaub77]

hey, first i would melt the Sorbitol for 10min. (white-> transparent colour) an than add the potassium nitrate (without iron oxide). I also get nice results with this ratios: 70g Sorbitol/120g potassium nitrate.

[moonfox3]

so you take potasium nitraite, mix it with a tiny amont of *that red stuff... what was that*

[cfield30]

red iron oxide

[moonfox3]

5/5! and where does one find red iron oxide and sorbitol??? please respond

[kjbrbbb]

where did you get your sorbitol?

[BackjardPyrotechnics]

very good info dude

5*

[chorioretinitis]

There is actually water involved, sorbitol is highly hydroscopic and generally contains some water. This water is what makes the grain plastic for several hours after cooling down.

jezzaforever123's note about KNO3 granules is valid, no matter how small the mesh size of your KNO3 mill is, you'll always end up with small granules of the nitrate suspended in solid sorbitol. You can approach, but never reach, the combustion stability of KNSU or other KN propellants prepared using the "wet" method.

[chorioretinitis]

Oh, yeah, and the most noticeable consequence is lower burn rate and therefore Isp, usually around 110 s for KNSO and 130 s for KNSU.

[fishcake1235]

grate vid JPR ,

-Do you know how Hygroscopic this mix is

[EARO27]

very interesting...do you preform experiments like this regularly?!? haha cool video 5/5

[jezzaforever123]

Good stuff!

I made some KNO3/Sugar mix, the best amount of Iron oxide to put in is about 1%

Generally it'd be a bit darker than pink, it'd be quite dark red when molten.

Btw, it's better to dissolve in water yeah? Because I can't see how this way (just melting it) the KNO3 would fully dissolve in the sorbitol, I can just imagine the KNO3 granules suspending in the mix.

Try dissolving the sorbitol in water, and compare it with the non-dissolved mix!

Great vids though

[justapyrorocketeer]

thanks,

yeah my mix was quite pink for some reason 1-2% is the way to go.

as for your recomendation on dissolving in water, i wouldnt. The method you speak of is the recrystalizing method. This works best for KNSU propellants. The method i used in the video is called the melt and cast method. KNSB needs to be melted and cast as shown in the video or it would be quite brittle and unsatisfactory. (even some people use the melt and cast for KNSU)

thanks again and good luck

JPR

[rcfreak2493]

what temperature are you cooking it at???

[justapyrorocketeer]

230-250 F

[RecrystallizedRocket]

Hey JPR

Nice Vid ! THX for.

But this propel is not good for Smokebombs, it dosn´t procedure so much smoke then KNOSU.

Greets

RCR

[justapyrorocketeer]

interested and want more info? send me a message!

JPR