Oh yeah. The FAA relies on TRA to analyze the class 3 flight proposals. So if
TRA is happy with your splash, everyone is happy.
Except the BLM concerning off playa recovery. Oops I kicked the hornets nest
there ;^)
On June 16, 2015 1:52:49 PM PDT, Cliff Sojourner <cls@xxxxxxxxxxxxx> wrote:
That's a great question. High altitude flights go through 4 or 5
distinct layers of different wind direction and velocity. So it is
crucial to have good wind data in the simulations. It is available
these days but was hard to come by 10 years ago.
Rocksim pro has configuration for different layers of winds. But its
drag model is poor for supersonic flights. Oh well.
On June 16, 2015 10:38:39 AM PDT, R Dierking
<applerocketry@xxxxxxxxxxx> wrote:
How does the analysis compare to results for the high altitude flights<applerocketry@xxxxxxxxxxx>
at Black Rock? Is the FAA happy with the analysis or how good the
actual result fit the analysis?
I don’t want to get too far OT and I guess this is my fault for even
mentioning splash analysis and high alts when I think we should focus
on the <20K’ for now. Because the Punisher race started all this.
From: Cliff Sojourner
Sent: Tuesday, June 16, 2015 10:30 AM
To: roc-chat@xxxxxxxxxxxxx
You can do splash for models, for example spot landing contests.
Does anyone know, does openrocket do splash analysis?
On June 16, 2015 9:45:20 AM PDT, R Dierking
wrote:launching
So motor variability includes thrust vectoring?
Hum… all parameters varied?
OK, I’ve never done that because I haven’t even come close to
a high alt rocket. So, please forget my reference to the splashrockets?
analysis. Perhaps for now just keeping the topic to the <20K’
James, next time you do the analysis for one of your high alts, please
let me see the results and the track the rocket actually took. Maybe
someday, way in the future, I’ll need to do this.
From: James Dougherty
Sent: Tuesday, June 16, 2015 9:20 AM
To: roc-chat@xxxxxxxxxxxxx
What Cliff said :-)
Sent from my iPhone
On Jun 16, 2015, at 6:00 AM, R Dierking <applerocketry@xxxxxxxxxxx>
wrote:
So the analysis does take into account launch angles. But, what’s the
maximum angle? Wow, than a high launch angle and altitude could take
your rocket out of even Black Rock and it would be acceptable? I've
heard that in the future FAA is interested in roll control. I wonder
why and if launch angle (intended and true) would be important.
From: Cliff Sojourner
Sent: Monday, June 15, 2015 11:51 PM
To: roc-chat@xxxxxxxxxxxxx
On 2015-06-15 11:46, R Dierking wrote:
This is an interesting problem, and a solution would help many people.
Really, what’s the use developing a complex ‘splash’ analysis for aat
high alt flight if you don’t even know what direction the rocket will
be going 20’ off the ground! And, if you are off 5 degrees at that
point, it makes a lot of difference where your rocket is going to be
+10K’.a
hi Richard, not picking on you tonight, really :) Splash analysis is
"monte carlo" simulation, many many flights with all parametersvaried,
such as launch angle, wind speed and direction, motor variability,etc.
at the end you can say with great statistical confidence that the
rocket really will fly and land somewhere on the splash chart.
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
