[sugpro] Re: Srm nozzle throat size
- From: Bill Kuker <bkuker@xxxxxxxxxxxxx>
- To: sugpro@xxxxxxxxxxxxx
- Date: Thu, 19 Feb 2015 13:46:49 -0500
Yes, check out http://content.billkuker.com/projects/rocketry/software or
https://github.com/bkuker/motorsim for the source code.
The math is more or less based on SRM.xls, but it has more options for
grain geometry.
-Bill
On Thu, Feb 19, 2015 at 12:18 PM, Steve Peterson <
steve_peterson@xxxxxxxxxxxxx> wrote:
> I wrote my own--it's not that hard. Also, Bill Kuker wrote a program that
> is available--don't know the details, though. It's at
> content.billkuker.com
> --Steve
>
>
> On 02/19/2015 04:40 AM, Dan Harrison wrote:
>
>> 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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