[AR] Re: Project update - propellant tank hydro tests
- From: Paul Mueller <paul.mueller.iii@xxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Tue, 19 Nov 2013 14:15:24 -0700
Pretty slick! But I am concerned that what appear to be non-stainless-steel
cap screws and snap rings will get very brittle at LOX temperatures.
Paul M
On Mon, Nov 18, 2013 at 1:40 PM, <qbert@xxxxxxxxxxxxxxx> wrote:
> Our 6" Condor tank was nearly the same except the actual tank was
> fiberglass and nearly 8 ft long and the bottom had a shallow cone to drain
> all the peroxide out. We also used a aluminium band on the oust side to
> give the screws something to hold on to other than fiberglass. We also used
> a thin PTFE layer against the fiberglass for safety and a piston to make
> sure all the peroxide went out the bottom. I got the idea of the design and
> piston from the Hybrid guys. No need for anti-slosh baffles. We had our
> in-flight tanks tested to 600psi and one tested to destruction at about
> 1050psi
>
> Robert
>
>
>
> At 12:21 PM 11/18/2013, you wrote:
>
>> Nice write-up. I haven't found it necessary to use anti-slosh baffles on
>> the rockets I've flown with 7 and 8" diameter tanks. Anyone else have any
>> experience that differs?
>>
>> --- Carl
>>
>>
>> On 11/17/2013 8:15 PM, Robert Watzlavick wrote:
>>
>>> I completed hydro-testing today on a prototype tank based on the design
>>> I mentioned a few weeks ago.
>>>
>>> In summary, no leakage or damage was observed after 2 cycles to 750 psi.
>>> There looks to be a small amount of permanent deformation in the center of
>>> the bulkheads (~0.005 inches) but nothing to worry about.
>>> While assembling the parts, as the o-ring slid past the tank wall holes,
>>> it shredded some small pieces off. I didn't debur the inside hole edge as
>>> well as I could have so I'll clean them up a bit and see if it helps.
>>>
>>> Discussion is at:
>>> http://www.watzlavick.com/robert/rocket/
>>>
>>> photos are at:
>>> http://www.watzlavick.com/robert/rocket/rocket1/photos/index.html
>>>
>>>
>>> -Bob
>>>
>>>
>>>
>> --
>> Carl Tedesco
>> Flometrics, Inc.
>> 5900 Sea Lion Place, Suite 150
>> Carlsbad, CA 92010
>> tel: 760-476-2770 ext. 515
>> fax: 760-476-2763
>> ctedesco@xxxxxxxxxxxxxx
>> www.flometrics.com
>>
>>
>
>
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