[AR] Re: Open Source Igniter / Rocket
- From: RM <rocketmoonlighter@xxxxxxxxx>
- To: "arocket@xxxxxxxxxxxxx" <arocket@xxxxxxxxxxxxx>
- Date: Thu, 12 Feb 2015 06:29:02 -0800
They must have improved their process then. See paul's experience below.
http://unreasonablerocket.blogspot.com/2010/08/getting-back-to-rockets.html
How are you measuring pressure tightness? Did you try submerging the
entire part in water to see if it bubbled?
-RM
On Thu, Feb 12, 2015 at 4:34 AM, Redacted sender gnsortino@xxxxxxxxx for
DMARC <dmarc-noreply@xxxxxxxxxxxxx> wrote:
> Shapeways SS is not porous. I’ve pressure tested it up to 2000psi
> without noticing any leaking. The challenge is building internal geometry
> as the 2 step printing process leaves a powder residue that if not cleared
> out will sinter and block internal passageways. The SLS process is very
> good and quite cheap for simple parts like igniters.
>
> *From:* RM <rocketmoonlighter@xxxxxxxxx>
> *Sent:* Wednesday, February 11, 2015 9:49 PM
> *To:* arocket@xxxxxxxxxxxxx
>
> $15 is pretty darned attractive. How did it work? I think I recall that
> Paul Breed found that the Shapeways sintered/infused stainless was too
> porous for his liking.
>
> On Tue, Feb 10, 2015 at 2:37 PM, Lloyd Droppers <ldroppers@xxxxxxxxx>
> wrote:
>
>> I did see your pr56 igniter, and I like it. Frankly I like the work on
>> your website from the valves to the 3d printed chamber, and you we're one
>> of the inspirations for me to post my own open source rocket work.
>>
>> I had initially looked at making the igniter conventionally machine, but
>> when I looked at Shapeways with a $15.00 price and 2 week leadtime for the
>> igniter I had to give that a try first.
>>
>> Lloyd
>>
>> On Tue, Feb 10, 2015 at 1:36 PM, RM <rocketmoonlighter@xxxxxxxxx> wrote:
>>
>>> Very cool Lloyd.
>>>
>>> I posted my latest design iteration of my igniter a few months back
>>>
>>> http://www.rocketmoonlighting.com/projects/pr56-igniter
>>>
>>> It looks similar in design to yours, but the body is conventionally
>>> machined. The fully dimensioned drawing is on the page for download.
>>> I've tested it with gox/propane, gox/kerosene, and n20/propane.
>>>
>>> I have an extra body ready to go if anyone would like to try it out
>>>
>>> RM
>>>
>>>
>>> On Friday, February 6, 2015, Lloyd Droppers <ldroppers@xxxxxxxxx> wrote:
>>>
>>>> Hi aRocket, you've been pretty quiet lately so I thought I would add
>>>> something to the mix. I've been working for the past couple months on an
>>>> open source liquid powered rocket , and I thought the list might be
>>>> interested.
>>>>
>>>> - 3d printed GOX / IPA igniter
>>>> <http://projectearendel.com/home/2015/01/igniter-testing/> up and
>>>> running
>>>>
>>>> - All the igniter documentation
>>>> <http://projectearendel.com/home/documentation/> (CAD / Arduino /
>>>> P&ID) and some design codes are on the website
>>>>
>>>> - I'm doing a once a day Instagram (ProcectEarendel
>>>> <http://instagram.com/projectearendel/>) for various rocket doodles
>>>> and project related picture
>>>>
>>>> - And a Kickstarter
>>>> <https://www.kickstarter.com/projects/2050946430/project-earendel> to
>>>> try to build a suborbital test vehicle.
>>>>
>>>> Hope that you all find it interesting, after 10 years building rockets
>>>> for other people, it is fun to do my own thing that I can share.
>>>>
>>>> Lloyd
>>>>
>>>>
>>>>
>>
>
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