SSTO

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Re: SSTO

Postby SANEAlex » Thu Nov 03, 2011 1:09 pm

rick m wrote:We are actually experimenting with a new propellant formulation that uses both KNO3 and NaNO3 combined with the sugar. I will be testing some motors this weekend at the FAR site using these propellants.


From what i remember from my Olevel chemistry the sodium nitrate will react slower and less energetically than the potassium one so are you trying for a longer slower burn? and if so do you think the lower air resistance losses will outweigh the larger gravity losses and get you to greater height from less energy?
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Re: SSTO

Postby rick m » Sun Nov 06, 2011 9:25 am

pauldear wrote:Hey Rick,

Great video! Out of interest, are other oxidisers any easier/cheaper to obtain, and do they work? For instance, ammonium nitrate, perchlorates (unstable, I guess), chlorates, or even peroxide? (I'm sure you've thought of or tried all these, but my ignorance knows no bounds!)

Cheers,
P


Actually, for many things, I believe the chlorates can be more 'unstable' than the perchlorates used in military and commercial rocket motors. I have found different fuels and oxidizers can be easy/cheap or difficult/expensive depending on where you live. I haven't tried many out so in that regard my ignorance likewise knows no bounds. We did successfully static test our new propellant formulation yesterday at the FAR site http://www.friendsofamateurrocketry.org/
that eliminates many of the problems we were having to contend with by using sorbitol. Heck, we even talked about starting our own aerospace company since we have two people interested in financially backing us if we did. I do it for fun right now and doing it as a job might change how I feel about it.

Rick
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Re: SSTO

Postby rick m » Thu Nov 17, 2011 7:23 am

Completed the second test on Saturday in Lucerne Valley with our new propellant. The long single grain with twice the propellant had an offset core (moon burner); burn was successful. Will be doing the third test of the new propellant this weekend at FAR with six times the propellant as the second motor.

Rick
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Re: SSTO

Postby rick m » Sun Nov 27, 2011 4:11 am

Third test of our new propellant was successful. A short casing was used to keep the pressure low with a nozzle throat sized for a longer casing. The motor also used a 2-segment unigrain made with three pours. Next test will be with the longer motor casing to bring up the pressure running a Kn of around 400.

http://www.youtube.com/watch?v=5xio_B9j6ng

Progress was also made refurbishing the test stand damaged in September's DoubleSShot static motor CATO.
Reaching for space one test at a time.

Rick
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Re: SSTO

Postby rick m » Thu May 10, 2012 10:27 pm

A small anomaly this past weekend set us back with the DoubleSShot motor.

https://www.youtube.com/watch?v=NuxTAv71Xac

Already started with a replacement motor yesterday and changes we are hoping to solve this latest problem.

Rick
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Re: SSTO

Postby rick m » Fri Jun 08, 2012 3:37 am

We did two methanol tests this past weekend and believe we now know why our two DoubleSShot motors CATOed. With that cause determined we are now working on a solution to prevent future CATOs.

We also aquired a videographer who is doing video work for the project.
Here is a sample of his work: http://www.youtube.com/watch?v=LydYQdaYwHA

Rick
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