[sugpro] Re: Verifying Motor Performance Through Flight Tests
- From: shawn.mchatten@xxxxxxxxxxx
- To: sugpro@xxxxxxxxxxxxx
- Date: Mon, 23 Feb 2015 19:34:52 -0500
Well, that answers that then :). Unless we should not extrapolate that a
streamer will have the same highly variable descents that the parachute
does. We COULD just pitch the sphere out without a chute or streamer but
retrieving intact the gps unit inside IS kind of the point :).
Shawn
On 2015-02-23 18:45, Steve Peterson wrote:
> Shawn,
>
> You're asking these questions faster than I can type :-)
>
> Yes, all that data is necessary just to get density. Please see my
> answer to your other question as to why a streamer/chute is unlikely
> to be helpful.
> --Steve
>
> On 02/23/2015 02:47 PM, shawn.mchatten@xxxxxxxxxxx wrote:
>> Hahaha! I think I got it. Although.... do we really need humidity, temp and
>> pressure or are they all just variables to give us air density which is what
>> we really want. And if there was some way to measure air density directly
>> would that not be more helpful. One way to measure viscosity is to drop an
>> object of "standard" mass and shape through the substance and measure the
>> rate of descent. So if we flew a rocket to 500m and pitched a 10cm/500g cube
>> out the side with a 50cm square chute (or whatever other "standard" object
>> we can make up) and measure it's descent would that not be all the data we
>> need to measure air resistance directly. It's just a matter of making an
>> easily repeatable standard. Maybe a tube or sphere instead of cube and
>> streamer instead of parachute.
>>
>> Shawn
>>
>>
>> On 2015-02-23 16:27, Michael Monteith wrote:
>> > Com on. Keep up. lol It's really just figuring out what it would
>> > take to determine motor performance
>> > through actually flight testing. I do like your idea though. Just
>> > measure things like temperature,
>> > humidity, and pressure on the way down so you can correct for air density.
>> >
>> > Thanks Shawn
>> > Michael
>> > --------------------------------------------
>> > On Mon, 2/23/15, shawn.mchatten@xxxxxxxxxxx <shawn.mchatten@xxxxxxxxxxx>
>> > wrote:
>> >
>> > Subject: [sugpro] Re: Verifying Motor Performance Through Flight Tests
>> > To: sugpro@xxxxxxxxxxxxx
>> > Date: Monday, February 23, 2015, 3:54 PM
>> >
>> >
>> > Not sure I'm following all this conversation but
>> > instead of a balloon can you gather data from a parachute
>> > recovery on the way DOWN instead of on the way up to
>> > establish air density etc. For that matter are there any
>> > papers that show air density or viscosity based on a
>> > specific parachute and mass configuration. If not that would
>> > be a cool standard to create for the community.
>> >
>> > Shawn
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