How long is your NAR payload?

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vcp

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I hadn't thought about it much before NARAM - the fine sand I got at Hobby Lobby required a tube of 78mm to get 28 gm. But the minimum length of 60 mm sort of implies that payloads exist that are much shorter. Is there a denser sand? If so what is it and where can a mere mortal obtain it. How short can you get a payload?
 

Buzzard

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Gary - Mine came in at 69mm. I seem to recall it sandbox sand. Chris Flanigan mentioned that he found some high-density sand. I will see if I can find that text.

Chas
 

dhbarr

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It should be possible to mix different grain sizes to increase density. Maybe not -reasonable- but doable.
 

MClark

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For filling sand bags for shooting sometimes zircon sand is used.
Black sand, magnetite, can be had from regular river sand.
 

dhbarr

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Huh. I had no idea about Zircon or Chromite sand. TIL.

On a related note I thought they had changed the payload dimensions to be 18-mm-couplery, but I see NAR still says the larger OD.

Maybe I'm just misremembering?
 

Buzzard

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From the US Model Rocketry Sporting Code 2017.2:

22.3 Payload Specifications The standard NAR payload is a sealed non-metallic cylinder containing fine sand, with a mass of no less than 28.0 grams. This cylinder must be a minimum of 17.0 millimeters in diameter, and a minimum of 60.0 millimeters in length. No holes may be drilled into it, no changes made in its shape, and no material may be affixed to it.

Chas
 

dhbarr

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Interesting, http://www.nar.org/contest-flying/us-model-rocket-sporting-code/payload-events/payload/ still says:

"
25.2 Payload Specifications
The standard NAR model rocket payload is a non-metallic cylinder containing fine sand, with a mass of no less than 28.0 grams. This cylinder shall be 19.1 +/- 0.5 millimeters in diameter, and 70.0 +/- 10.0 millimeters in length. The payload may be permanently sealed to prevent the loss of the sand. No holes may be drilled into it, no changes made in its shape, and no other material may be affixed to it.
"
 

vcp

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Guess I need to find some depleted uranium 'sand'.
 

vcp

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Buzzard

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Interesting, http://www.nar.org/contest-flying/us-model-rocket-sporting-code/payload-events/payload/ still says:

"
25.2 Payload Specifications
The standard NAR model rocket payload is a non-metallic cylinder containing fine sand, with a mass of no less than 28.0 grams. This cylinder shall be 19.1 +/- 0.5 millimeters in diameter, and 70.0 +/- 10.0 millimeters in length. The payload may be permanently sealed to prevent the loss of the sand. No holes may be drilled into it, no changes made in its shape, and no other material may be affixed to it.
"
Guess the volunteer that updates the website hasn't made the change to the latest USMRSC, aka Pink Book.

C
 

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