[SS-VehDev] Re: composite short stack/instrumentation section

[Lakestake Rocketry]

Thanks Richard,

It looks like I should size the mandrel up slightly to match his nozzle.
I am trying to purchase one mandrel for all three projects; my rocket,
the SS2S test tube and the SS2S final airframe/motor. If the SS2S
nozzel has already been commissioned that is the limiting factor on
possible O.D.s.

Matt


Hi Colin,

Filament wound would be great, I was playing with that idea and decided
that I didn't have access to enough technology to offer it as an option
for us to do as an internal project. I am not going to order my mandrel
for a bit, please do look into the possibility!

The airframe and motor casing are currently being considered as one
part. The motor casing also will need to be able to take the unique
dual phase motor that Richard's team has been designing. You might
want to review past posts or correspond with Richard for specifics before
coming up with a filiment wound proposal.

I am hoping to get at lot of additional input from this group on the layer
design for the fabric composites proposal. Roman, Colin, can you make
the first proposal on layers/orientations for a Carbon/Kevlar airframe
and motor? If not please respond with what steps need to be achived
before we can do this (do we need to gather loading data for available
weaves?).

Once we, as a group, agree on a design I'll lay up a 1 foot square
section for initial testing. I may have a source for testing, but I would
rather use the person the group has agreed on for all our project data.
Once we have confirmed the properties of the design, and if it looks
like we want to go ahead with the internal fabric proposal I'll put together
a 4' section of tube for destructive testing.

Matt C

On 10/7/05, Rich Nakka <richnakka at rogers.com> wrote:
>
>  Lakestake Rocketry wrote:
>
> Richard,
>
> I put a question to Bill that I have not heard back an answer on.
>
> I guess it really should have been addressed to you.
>
> The other rocket Bill referred to has an O.D. of 250mm. I can
> go back and re-design it if the SS2S rocket must use a different
> mandrel. I don't want to purchase two mandrels just a few tenths
> different.
>
> What are the requirements for the SS2S casing? Can it work
> with the mandrel I was going to acquire, or do you have specific
> requirements for this project?
>
> The current design calls for a 244mm core.
>
>  Matt,
> We want to remain reasonably flexible on the diameter of the casing at
> this point so as not to (unnecessarily) paint ourselves into a corner. It
> will be in the neighbourhood of 10" (255 mm). For the proposed "side study"
> it does not matter what the exact diameter is, either, anything close to
> this is just fine. On the chance that it will be used together with the
> nozzle that Evans is currently making for us, for a short-stack test, the
> casing ID should be no less than 9.873" (250.8 mm). See attachment.
>
> Richard
>
> Matt C
>
> On 10/4/05, william colburn <space1space at sbcglobal.net > wrote:
> >
> > Matt, Colin,
> >
> > This is both an introduction and a request to forge
> > ahead on the 40 inch length of 10 inch composite tube.
> > Matt has a mandrel or will have (for another personal
> > project he is doing) and requires some aid in
> > designing a hand-layup tube with a minimum of 41 ksi
> > hoop and 21 ksi longitudinal strength in a .188
> > nominal wall thickness.
> >
> > He will be using simple techniques and readily
> > (?)available materials.
> >
> > Colin is an expert in this field and it is hoped can
> > steer us in the right dfirection to get our goal.
> >
> > Included in this fabrication effort will be the
> > incorporation of end closures which use a minimum of
> > tube length but can endure the full longitudinal
> > stress under maximum expected pressure.
> >
> > We will test this item to perhaps 1200 psi to validate
> > its ability to operate with a MEOP of 800 psi.
> >
> > At this point thermal resistance is not the main
> > criterion. We can always incorporate ablatives or
> > internal insulation depending on the location for the
> > use of the tube material (casing or instrument
> > housing)
> >
> > Richard may well have some inputs too so belay any
> > effort until you have an all clear from him.
> >
> > I am away for the next few days (Conference on
> > Biologic Processes in Space.....shame on you for that
> > thought:)
> >
> >
> > BC
> >
>
> ------------------------------
>
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