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  #1  
Old 12-24-2020, 06:43 PM
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Default Card stock for making centering rings

I use to use 3/16” cardboard with foam middle, but now it’s hard to find, because today’s companies use foam with a coating in place of the cardboard.

So my question is, what weight card stock should I buy to make centering for D-F black powder motor rockets 10 to 18oz range?

Or

Does anyone know a foam board with true cardboard on both sides that I can buy
Thank you!
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Old 12-24-2020, 06:52 PM
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Check mat board at Michaels or other craft stores or framing stores. It's like what I make my centering rings from. It's around 1/16" thick, give or take.
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Old 12-29-2020, 12:48 AM
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Default Ditto

one sheet of matte board will last a lifetime

it even comes in pretty colors.....not that it makes any difference
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Old 12-29-2020, 09:54 AM
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Actual framing stores (not a Michaels or Hobby Lobby)
will often have scrap mat board for sale - cheap!
These are sometimes the centers cut out of a border piece
that are too small to be used on another frame.

Add some gussets for a very strong engine mount:
http://modelrocketbuilding.blogspot...art-4-24mm.html
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Old 12-29-2020, 02:24 PM
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I'm cheap. I often make them out of cereal boxes and just sandwich a couple together with wood glue if I want stiffness. I've never had one fail, even on clusters and larger motors.
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Old 12-29-2020, 11:10 PM
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Quote:
Originally Posted by tbzep
I'm cheap. I often make them out of cereal boxes and just sandwich a couple together with wood glue if I want stiffness. I've never had one fail, even on clusters and larger motors.


I might try that—especially using a space-themed Quisp cereal box! Yes, believe it or not that stuff is still made. (Not Quake cereal, though.)
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Old 01-03-2021, 02:11 AM
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Quote:
Originally Posted by jeffyjeep
I might try that—especially using a space-themed Quisp cereal box! Yes, believe it or not that stuff is still made. (Not Quake cereal, though.)

I still eat it!! If anybody needs a box let me know.
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Old 01-03-2021, 11:18 AM
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Somewhere around here I still have a mint "Quisp Quazy Energy" wristwatch in a decorative tin case that I got for $5 and three box tops.
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Old 01-03-2021, 11:33 AM
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Quote:
Originally Posted by erik442
Somewhere around here I still have a mint "Quisp Quazy Energy" wristwatch in a decorative tin case that I got for $5 and three box tops.

DANG! I missed that one! MY Quisp toy was a wearable Quisp beanie with a battery powered propeller. My BF was a Quake eater and his toy was a Quake miner’s helmet with a working headlamp. My mom said he training to be a gynecologist but I didn’t know what that meant.
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Old 01-03-2021, 12:26 PM
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Quote:
Originally Posted by Flash
So my question is, what weight card stock should I buy to make centering for D-F black powder motor rockets 10 to 18oz range?

I'd use thin plywood. 1/32" ply would probably be OK.

But if it's for a very large diameter, or a crazy high thrust spike, then 1/16" plywood.

On a 7" diameter 4 foot tall Little Joe-II, I actually made the centering rings out of 1/64" ply, but each ring was a sandwich of two 1/64" rings glued to very light 1/8" balsa. Very stiff, VERY light for the size and stiffness.

I use the arc-scribing method to make rings, which works well with thin plywood and plastic:



Article how-to: http://georgesrockets.com/GRP/Artic...Rings/Rings.htm
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