nomex honeycomb question - Northern Colorado Rocketry

This topic has 15 replies, 6 voices, and was last updated 14 years, 9 months ago by Tim Thomas.

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February 19, 2011 at 10:37 am #53845
Warren B. Musselman
Moderator
One thing about Nomex honeycomb panel. Weight depends a LOT on how it was made. If epoxy from the layup process fills some or all of the cells, it weighs a lot more than if it was properly laid up. I’ve seen homemade panel that didn’t v-bag and the excess epoxy went INTO the honeycomb instead of out.
February 19, 2011 at 3:01 pm #53846
djsroc
Keymaster
Since I have not seen this stuff, would 1/8″ take the abuse of a full L motor? The actual fins would use the 3/8″ but I will use the 1/8″ for other parts.

Im thinkin Ill go with my other upscale plan. The one I want to do may get too expensive and could be very unstable at the scale I want to go with. I may even do a smaller scale of this then planned to test it.
February 19, 2011 at 5:16 pm #53847
Ed Dawson
would 1/8″ take the abuse of a full L motor?

Well that all depends on the size ans shape of the fin, and the speed of the bird. If you have a long root and a small span (like the spars on an ARM), then you could use pretty pretty much anything. But a large span and a small root (ie an Mosquito) are another thing.

It’s pretty good stuff. I also have some bare honeycomb core for making your own. As Warren poits out, that is pretty easy, but it’s also very easy to add unneeded epoxy weight.

I’ll be at the All Colorado Rocketry Dinner next week if you want me to bring the honeycomb for you to see for yourself.
February 20, 2011 at 4:17 am #53848
Warren B. Musselman
Moderator
I’ve flown 1/8″ honeycomb fins on my L2 cert bird – standard trapezoidal planform ala Nike Smoke. Has something like 10 flights K and L on it and has fallen from 2K with an incomplete main deployment and bounced. No problem. That said, there are 3 layers of tip to tip of carbon/kevlar hybrid fabric, carbon and glass.

Warren
February 23, 2011 at 12:57 am #53849
djsroc
Keymaster
I wont be at the dinner but if anyone could bring a sample to the next launch that would be great.

I could always pick it up from anyone too.
February 23, 2011 at 1:38 am #53850
Tim Thomas
8) I was just eyeballing the latest Fibre Glast offerings. Under sandwich core – Nomex Honeycomb .210 cut – 3/16overexpanded cell. 1.8 lb./cu.ft. 40 X48 119.99
full sheet 40 X100 199.99. Also end grain balsa, bonded to a scrim fabric in 2′ X 4′ sheets 1/4 – 24.95 3/8 -29.95 3/4 – 44.95 It would sure be fun to play with this stuff if you had the time and money.
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