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

[Smith, David (Beltsville)]

Gents:
We haven't arrived on a final configuration as we are still studying the
cost/benefits of the available shapes.

It is my understanding Hans Toft is lined up to help up with the nosecone
optimization. Let's complete the noseconse shape selection, then take a
"first pass" at the thermal and aero loading. At that point, construction
methods and material types can be addressed.

Cheers-
Dave



-----Original Message-----
From: roman.lev at aero.cz [mailto:roman.lev at aero.cz] 
Sent: Tuesday, September 06, 2005 1:07 PM
To: lakestake at gmail.com; SS-VehDev at sugarshot.org
Subject: RE: [SS-VehDev] Fwd: [ROC-CHAT] Steel-toed nosecones...

Hello guys,
 
I would propose some test, I would manufacture honeycomb snadwich test
samples with embeded thermocouples, one of them with cork thermal outside
insulation, thermal insulation would be similar as "Delta Velocity"
nosecone, except structure [ honeycomb/aramide or honeycomb/carbon/aramide
]. Per article is 2mm thick outside cork insulation capable survive, see
link
 
http://www.compositesworld.com/hpc/issues/2004/September/561
 
(3) pages together, interesting. The best would be for now some thermal
simulations- is somebody capable to do this [ does somebady have some
software ]?
 
R+
 
________________________________

Od: ss-vehdev-bounces at sugarshot.org za uživatele Lakestake Rocketry
Odesláno: út 06/09/2005 2:21 odp.
Komu: SugarShot Vehicle Development Team
Předmět: [SS-VehDev] Fwd: [ROC-CHAT] Steel-toed nosecones...


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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