[sugpro] Re: Srm nozzle throat size
- From: Dan Harrison <daniel5841@xxxxxxxxxxx>
- To: "sugpro@xxxxxxxxxxxxx" <sugpro@xxxxxxxxxxxxx>
- Date: Thu, 19 Feb 2015 07:40:17 -0500
Thanks for the replies .
Michael, that is a good idea with the bolt I will try that when I build my
stand.
Steve, is there a different software you use to sim motors? I know there is a
program called burnsim but I was under the impression that was only for ap
motors .
Thanks,
Dan
> On Feb 17, 2015, at 1:08 PM, Michael Monteith (Redacted sender
> "michael_r_monteith@xxxxxxxxx" for DMARC) <dmarc-noreply@xxxxxxxxxxxxx> wrote:
>
> One I've seen is where they pre load it with a weight and use a bolt
> underneath the load
> cell and adjust it to limit the load cell being pushed any further. Of
> course the bolt being
> locked in place once it's adjusted. That way you get the resolution by using
> a smaller
> cell but protect it from being pushed too far in the case of miscalculation
> or catostrophic
> event. Probably should be a standard procedure anyway to protect the load
> cell.
>
> Michael
> --------------------------------------------
> On Tue, 2/17/15, Steve Peterson <steve_peterson@xxxxxxxxxxxxx> wrote:
>
> Subject: [sugpro] Re: Srm nozzle throat size
> To: sugpro@xxxxxxxxxxxxx
> Date: Tuesday, February 17, 2015, 1:02 PM
>
> Hey Dan,
>
> I can't answer the first
> question since I don't actually use SRM, but
> the calcs it does are pretty accurate--the real
> question will be how
> accurate/reliable is
> your construction? The safe thing to do, if you've
> never tested a motor before, is to start with a
> load cell that is
> capable of much more
> thrust than you anticipate your motor will produce,
> especially if/when it CATOs.
>
> --Steve
>
> On
> 02/17/2015 09:35 AM, Dan Harrison wrote:
>> Hello ,I'm looking to find some info
> on using Richard nakka's srm.
>> Is there a way to change the
> nozzle throat size to match my motor? I tried using the
> nozzle erosion box but I'm not sure if that is the right
> way to do it.
>>
>> How
> accurate is srm ? I realize there are a lot of variables
> .but generally speaking if it calculates 25 lbs max thrust
> is that usually close to what it will measure on a test
> stand? The reason I ask is I'm building a test stand and
> I want to make sure I put the correct load cell on for my
> first test.
> Thanks,
>>
>> Dan
>
>
>
>
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