SpaceManMat --
I am finalizing my presentation for a conference that my company is hosting this week.
I leave for Tucson, AZ next Sat and I'll be gone for a week so it will be a couple weeks before I can return to my 'little' project of porting a suite of very old AltAcc Programs for the Blue Raven data files.
Not to mention relearning a bunch of things that I've forgotten
Yes, I did notice that OR produces slightly different sims when the integration calculation frequency is increased.
But thats the way numerical integration works ( and sometimes does not work ) but I am with you on the frequency of the Calcs.
One issue I may have to solve is that AltAcc Data points from above were gathered as 8-bit unsigned char at 16 HZ -- it is very primitive compared to what we have today.
OTOH, I've got one Blue Raven Flight which records accelerometer and gyro data as 16-bit signed int at 500 Hz ( ! )
I'll definitely come back to this project after the conference so don't worry if I appear to disappear for a couple weeks
Just for fun, this is what I called the Raw Acceleration -vs- Velocity 'bun' for a J570 flight from Turkey Shoot1999 in Bolder City NV.
And it is is where the Rho-Normalized CD curves from post #44 came from for the different flights ( this is the ts991127 / j570 curve ).
It is a cycle from liftoff, over the top thru the thrust phase and back to v=0 for the coast phase along the lower curve.
Note the Transonic effects on acceleration out at high v .
The raw data for the flight, including site and rocket parameters and notes are attached below as a .txt file.
Maybe other people with Accelerometer Data would like to play too
-- kjh
p.s. Larry Curcio recently pointed out that I need to adjust Pressure Altitude for Temperature which I never bothered to do for the AltAcc Files becauseI am an Accelerometer Bigot
The Raw Pressure Altitude in the attached file is a little lower than the Inertial Altitude in the attached AltAcc Data File.
Adjusting the Pressure Altitude at Apogee ( 8868 ft ) for Site Temperature ( 62 F ) gives a Density Altitude of 9442 ft which is scary-close to the Inertial Altitude at v=0 of 9553 ft.
Thanks Larry !