[SS-VehDev] Fwd: [ROC-CHAT] Steel-toed nosecones...

[william colburn]

I have e mailed John Cippola with a request to run NC
shapes for us on his CFD software. Failing that I
requested he supply a copy of the software to a team
member to do the same in exchange for a banner on our
site.

Legacy has NC's in our regime made from Phenolic
(arcas), aluminum (many, sometimes with a differing
tip) ((csxt used aluminum with a steel tip to do over
70 miles very successfully) or aluminum with an
ablative coating often as thin as .02 inch. Titanium
has been used in flight regimes at this mach level for
very long durations. 

But a second consideration is the temperature of the
interior. With such a short exposure time, this should
be easily dealt with by an ablative coating (which
removes heat from the surface) or with internal
insulation.

The third consideration is survivability. The NC
should be able to survive not a full ballistic impact
(never happen!) but at leat 100 fps or so due to a
shredded or streamihng recovery chute. Survive to the
extent of protecting the payload and instrumentation.

I am all for using technolgy at the edge providing it
is not overkill, increase weight, or decrease
reliability. I like the KISS principle (keep it
simple....) happens to be a good engineering axiom.

So are we ready to plug these concepts into a matrix
as yet? I don't think so. I want to see what John
comes up with in his CFD analysis for temperatures and
a shape. That may point us to a specific concept.

BC

--- Lakestake Rocketry <lakestake at gmail.com> wrote:

> Good morning Vehicle Team,
> 
> I have been thinking a lot about the nose cone. We
> have a couple of people
> with good composites expereince and skills, and an
> offer for Ti work. What
> is the best design? If noone steps forward with
> knowledge by this evening
> I'll look it up and let the team know. Any takers?
> 
> A friend of mine (aerospace engineer) has made an
> interesting offer...
> 
> Matt C
> 
> ---------- Forwarded message ----------
> From: John Wahlquist <wahlquist at altrionet.com>
> Date: Sep 6, 2005 12:23 AM 
> Subject: Re: [ROC-CHAT] Steel-toed nosecones...
> To: ROC-CHAT at rocketeers.com
> 
> How about using foamed or fibrous bonded silica (aka
> shuttle tile) or maybe
> even Carbon/Carbon. Much lighter than steel or
> aluminum and handles heat
> even better. If someone wants to try this I can
> provide details on how to
> make a compatible surface filler to smooth out the
> porous surface for the 
> silica products.
> 
> <JSW>
> 
> -----Original Message-----
> From: Rocketry Organization of California (ROC) Chat
> List
> Sent: Monday, September 05, 2005 11:44 PM
> To: ROC-CHAT at ROCKETEERS.COM
> Subject: Re: [ROC-CHAT] Steel-toed nosecones...
> 
> > I've wondered about an ablative nose cone 
> 
> Well, I could add a few extra coats of paint. I was
> also thinking
> about shaving off the end of the nosecone and
> replacing it with some
> matching light aluminum chunk with higher-temp epoxy
> dumped in from the 
> opposite (open) end of the nosecone. At least the
> majority of the
> nosecone is plastic/fiberglass.
> 
> -Jim Moses
> 
> --- David Erbas-White <derbas at ARACHNEERING.COM >
> wrote:
> 
> > Jim Moses wrote:
> >
> > >At what speed is in necessary to do something
> different to a
> > fiberglass
> > >or plastic nosecone to deal with the nosecone
> heat and prohibit
> > melting
> > >of the nosecone?
> > >
> > >If I put some kind of a metal cap on the
> nosecone, how far down must
> > it
> > >extend to work correctly.
> > >
> > >
> > > 
> > >
> > >
> >
> > I don't know the answer, but in wondering about
> it, I've wondered
> > about
> > an ablative nose cone -- much like a re-entry heat
> shield. Thoughts?
> >
> > David Erbas-White 
> >
> 
> 
> 
> 
> 
>
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