Sims vs Measured

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4 months 1 week ago - 4 months 1 week ago #338 by achoward
Sims vs Measured was created by achoward
Well, based on Tom’s discussion at our last Zoom mtg, it got me thinking about analyzing some of my sim vs actual data. So here’s a start….this is for The Stinky Sewer Pipe Rocket that has flown mainly on J’s and K’s over the course of several years. The actuals are the average of the 2 on-board altimeters. A lot more analyses can be done, but I was encouraged by this first look for one rocket.
Another add/edit: The data were obtained at launches in TX, NM, KS, IL, MI, OH, and IN.
Last edit: 4 months 1 week ago by achoward.

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4 months 1 week ago #339 by achoward
Replied by achoward on topic Sims vs Measured
2nd try on the graph.... 

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4 months 1 week ago - 4 months 1 week ago #340 by achoward
Replied by achoward on topic Sims vs Measured
Take 3 on getting the graph here.
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Last edit: 4 months 1 week ago by achoward.

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4 months 11 hours ago #343 by silgan01
Replied by silgan01 on topic Sims vs Measured
Looks like the sim is coming in both high and low compared to the actual height. I am guessing you didn't change the drag info in the simulation so most likely caused by actual wind speed vs sim wind speed or is there that much variation in motor performance?

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3 months 3 weeks ago #346 by achoward
Replied by achoward on topic Sims vs Measured
Yes, no change on drag. Also, I never measured actual launch rail angle. Changes there along with actual wind speed off rail can really influence raw altitude. Weathercocking would result in lower altitude. Motor variation is also there.
The following user(s) said Thank You: mcfrye2014

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