[AR] Re: Open Source Igniter / Rocket
- From: Lloyd Droppers <ldroppers@xxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Sat, 7 Feb 2015 15:18:06 -0800
Graham - The threads worked OK, I had to chase them with a bottoming tap
to get them to work well. It looks like the brass infused steel on
shapeways prints about 3-4 mil thicker than the stl so small threads would
have to be oversized to work - maybe on v2. Also they were small threads
10-32 and 1/4-32 so beefier threads like 9/16-18 might work better. Sorry
about Blender, I used solidworks and it has a nice helical sweep feature.
Ben - I have used self pressed LOX before, but only for short durations in
a test stand, and it worked fine there, but you have to get high quality
temperature measurements to have accurate mass flow measurements. My plan
is to leave a good ullage and residual volume on the LOX and not get it to
a constant temperature so you have three zones from the base - liquid, low
density liquid, and gas. Then just run it in the liquid phase with some
residual. Not the most efficient use of tank volume but for a suborbital
rocket I chose simplicity over efficiency.
If I'm wrong, and the self-press LOX doesn't work, then adding extra
pressurant and a pressurant system and living with that is not optimal but
a possible backup solution.
Peter - The three ports are for Ox / Fuel / Pressure.
Lloyd
On Sat, Feb 7, 2015 at 2:21 PM, Peter Fairbrother <zenadsl6186@xxxxxxxxx>
wrote:
> On 06/02/15 20:43, Lloyd Droppers 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 printedGOX / IPA igniter
>> <http://projectearendel.com/home/2015/01/igniter-testing/> up and running
>>
>
> Perhaps a silly question, but are there three pipes going to the igniter?
> Why?
>
> Good-looking project!
>
> Thanks,
>
>
> -- Peter Fairbrother
>
>
>
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