[SS-VehDev] Re: [SS-Main] to RN - temperature resis. hncmb/composite

[Lakestake Rocketry]

Hi R+,

Your recommendation by Richard is high praise.

I am CC:ing the rest of the Vehicle Development team on this request as you 
have put
forward some good suggestions in this area.

Can you give us a little more detail in a proposed nosecone design using 
composites?
I am interested in your thoughts on this separately from the question below.

We are most likely going to be going fast enough for a long enough time that 
standard
expoxies won't be able to hold their strength considering the frictional 
heating. I have
looked into high-temperature expoxies, but even they don't seem to be up to 
the task.
What solutions have you run across that work in this arena?

Matt C

On 9/2/05, Ing. Roman Lev <r-composites at seznam.cz> wrote:
> 
> details about themperature properties of composite/honeycomb structures - 
> all standard resins/hardneres got Tg [ softening point ] about 80 degC, in 
> combination with better curing agents [ freely acessible ] about 110-115 
> degC. HT tooling resins [ I have still about 3 lbs home ] after postcuring 
> Tg about 180 degC. Standard epoxy prepregs are about 150-170 degC. 
> Polyimides over 220degC are unavailable for mee, they are too expensive [ 
> 200 $/ lbs... ], too difficult to work and not usually accessible. 
> Combination with phenolic resin [ ablative prepregs made by Cytec etc ] - 
> fabric must be special surface treatment, filament finishes of free 
> accessible fabrics are not compactible with phenolics.
> 
> lets say the cheapest one technology up to 115 degC
> better quality [ tooling ] resins up to 180 degC. filament type doesnt 
> have any influence here [ short expositions, just minutes ].
> 
> Do you want some samples to test? Its not a problem, what shape?
> 
> r+
> 
> 
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