Ducted Ramjet that is meant to fly.

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kent
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Re: Ducted Ramjet that is meant to fly.

Post by kent » Wed May 06, 2009 10:11 am

Ok i have managed to raise some more cash, so i am back on track.

I had a long talk with a friend that works with furnace exhausts for central heating systems. he suggested to just use carbon fiber with epoxy.
just let the surface epoxy burn away apparently high temp open flame valves in some designs are made like this.

The surface epoxy will usually carbonizes and seal the laminate.

I have ordered some Carbon cloth and my friend is sourcing the special epoxy that they use. As soon as i get it i will begin construction

airrocket
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Re: Ducted Ramjet that is meant to fly.

Post by airrocket » Sat Jan 09, 2010 5:30 am

special epoxy...what type of epoxy?
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Zippiot
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Re: Ducted Ramjet that is meant to fly.

Post by Zippiot » Sat Jan 09, 2010 5:47 am

Regular epoxy melts but Pheonlic resin is ablative, instead of melting it flakes away as it burns. Cant find it at Tap Plastics but can be ordered from fireworks suppliers
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makulit
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Re: Ducted Ramjet that is meant to fly.

Post by makulit » Sat Sep 10, 2011 10:46 pm

I want to try MgO - Cast it and go? Its strong enough to make hurricane proof wallboard all by itself. Actually, might be able to make a 2D ramjet with wallboard? I like that Idea since it would work with the air vehicle I'm imagining.

I like the cork and oak ideas mentioned. The idea of building a wooden ramjet is very attractive. Boric Acid would act as a fire retardent? and slow the oxidation of the carbon (refractory) layer.

ace_fedde
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Re: Ducted Ramjet that is meant to fly.

Post by ace_fedde » Sun Sep 11, 2011 10:10 am

There is much more info on ceramics on the forum.
Let's continue about them here:

viewtopic.php?f=7&t=6301
(I fixed the link)

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DoctorRocket
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Re: Ducted Ramjet that is meant to fly.

Post by DoctorRocket » Thu Sep 29, 2011 5:00 pm

Try spin-casting Dow Corning DC93-104 ablative polymer over a high-temperature wire matrix. Worked well for integral rocket ramjets to replace a 3D quartz phenolic liner.
product info:
http://www.dowcorning.com/applications/ ... &type=PROD

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