[SS-VehDev] Re: tasks, current

[Lakestake Rocketry]

Good evening,

As far as the "get inputs" goes shouldn't we (The VehDev team) be receiving
comprehensive specifications from each team lead as to their requirements?
We have our proposed starting point, but it would help in design if we knew
the mass/space/temperature/shock requirements of all the parts we need
to house/integrate with.

Once each team has prepared their proposals we can re-evaluate the design
to see if we are still under mass and then tweak the airframe design to
provide the needed concessions to each device.

Matt

On 10/26/05, Rich Nakka <richnakka at rogers.com> wrote:
>
> Three minor comments/suggestions:
>
> william colburn wrote:
>
> Here is my current list of tasks:
>
>
> 3. Settle the launch lugs vs three rail tower vs
> launch tube question.
>
>  Miraglia has some prelim CFD results for total drag with/without lugs. I
> suggest he continue to refine the analysis, maybe look at smaller or less
> obtrusive lugs.
>
> 5. Get inputs from Bob Fortune on the recovery system
> volume needed. (150 lbm to recover at no greater than
> 25 fps; require low altitude deployment of the main
> and a drogue from 100K or so)Determine snatch forces
> on drogue and main for purposes of designing
> attachment points.
>
>  I suggest that a higher touchdown velocity should be considered, say
> 30-40 fps. Since required chute area (i.e. mass) is inversely proportional
> to velocity squared, increasing TD velocity to 30 or 40 fps requires a chute
> of 70% and 40% the size, respectively.
>
> Chute volume may not be a big problem. The chute ("fairing" ) portion of
> the vehicle has been rather arbitrarily taken to be 2 feet (0.6 m). I
> don't expect that lengthening the fairing should add much weight if it is
> fabricated from carbon composite sandwich material or similar
>
>  6. Design NC removal system; I favor staying away from
> BP for two reasons: altitude ignition (probably very
> solvable) and dirty combustion products (maybe piston
> ejection?)
>
>  Yeah... piston ! ;-)
>
> Richard
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.exrocketry.net/pipermail/ss-vehdev/attachments/20051026/b0049835/attachment.htm