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Casting KNSB with surfactant - what are your experiences?


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#21 mabuse00

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Posted 04 January 2017 - 03:57 PM

I haven't done any further testing since then..

 

My last tests in 1lb motors never did produce any thrust. I had no time to reveal what was the problem, maybe it wasn't the sodium laureth sulfate but something else...



#22 bmcpeak363

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Posted 11 January 2017 - 01:15 PM

I would like to ask the opinion of those who have been making their own HP rocketry sugar propellant for awhile. I have test fired and had 2 successful launches without anything exploding. My question is that i am considering buying the data acquisition package that includes the load cell from Aerocon. I would build a test stand for it.

I am hesitant to spend the money on that. Would rather buy chemicals and rockets. :)

Do you think it is needed to proceed safely? 



#23 stix

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Posted 12 January 2017 - 04:10 AM

No, I don't think you need one to proceed safely.

 

A test stand and software is useful for checking the consistency of your motors. With the measured data you can also do calculations to predict altitude.


I just start the conversation - someone else has to question them.


#24 yelloj

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Posted 12 January 2017 - 06:53 AM

"can be poured without the use of surfactant if one uses granular KNO3 as one gets when purchased".

Does this mean Prilled? Thanks.

When I purchase KNO3 I buy it in 50 lb bags from hydroponics type fertilizer supply houses.  This KNO3 always comes as a fine crystalline material much like table salt.



#25 yelloj

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Posted 12 January 2017 - 06:57 AM

No, I don't think you need one to proceed safely.

 

A test stand and software is useful for checking the consistency of your motors. With the measured data you can also do calculations to predict altitude.

 

I would like to ask the opinion of those who have been making their own HP rocketry sugar propellant for awhile. I have test fired and had 2 successful launches without anything exploding. My question is that i am considering buying the data acquisition package that includes the load cell from Aerocon. I would build a test stand for it.

I am hesitant to spend the money on that. Would rather buy chemicals and rockets. :)

Do you think it is needed to proceed safely? 

If you are using KNO3/sorbitol motors you really do not need to do a lot of testing via a test stand.  This propellant is really quite well characterized.  If you size your nozzles to deliver a Kn of ~ 300 - 350 you will have no problems.  If you want to experiment a bit with other sugars or additives then you will want to use a test stand to characterize your propellants.






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