[AR] Re: dynamic stability
- From: "Monroe L. King Jr." <monroe@xxxxxxxxxxxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Wed, 20 Aug 2014 17:43:46 -0700
I don't think Flowmetrics flies under a TRA waiver for starters. The
one launch I observed was an atlas vernier modification LOX and
Hydrocarbon at FAR
As I understand it Class 3 is "P" and above and you can bet they want a
FULL 3 Sigma 6 degree of freedom analysis.
AT a TRA event such as BALLS if you within a certain amount of their
standing waiver for altitude you might get some benefit. But they are
still going to require 3 sigma analysis (although you might get some
help with it) and they in-turn are going to hand that to the FAA.
Last I remember it's 14 points they look at during the analysis I have
a list here somewhere.
Monroe
> -------- Original Message --------
> Subject: [AR] Re: dynamic stability
> From: Carl Tedesco <ctedesco@xxxxxxxxxxxxxx>
> Date: Wed, August 20, 2014 5:24 pm
> To: arocket@xxxxxxxxxxxxx
>
>
> That is what I wondered. From an aerospace engineering point of view,
> dynamic stability looks to see how a rocket will respond when a
> disturbance is imparted on it. CP/CG rules determine static stability,
> albeit still important. So, the Tripoli example you mention suggests
> that they just want to know how the CP and CG change throughout the
> entire flight?
>
> Monroe, do they require they require 3-sigma or dispersion analysis?
> Below is an excerpt of what I was emailed (looks like it was cut &
> pasted from the FAA website).
>
> (a) Class 2---High-Power Rockets. When a Class 2---High-Power Rocket
> requires a certificate of waiver or authorization, the person planning
> the operation must provide the information below on each type of rocket
> to the FAA at least 45 days before the proposed operation. The FAA may
> request additional information if necessary to ensure the proposed
> operations can be safely conducted. The information shall include for
> each type of Class 2 rocket expected to be flown:
> (1) Estimated number of rockets,
> (2) Type of propulsion (liquid or solid), fuel(s) and oxidizer(s),
> (3) Description of the launcher(s) planned to be used, including any
> airborne platform(s),
> (4) Description of recovery system,
> (5) Highest altitude, above ground level, expected to be reached,
> (6) Launch site latitude, longitude, and elevation, and
> (7) Any additional safety procedures that will be followed.
> (b) Class 3---Advanced High-Power Rockets. When a Class 3---Advanced
> High-Power Rocket requires a certificate of waiver or authorization the
> person planning the operation must provide the information below for
> each type of rocket to the FAA at least 45 days before the proposed
> operation. The FAA may request additional information if necessary to
> ensure the proposed operations can be safely conducted. The information
> shall include for each type of Class 3 rocket expected to be flown:
> (1) The information requirements of paragraph (a) of this section,
> (2) Maximum possible range,
> (3) The dynamic stability characteristics for the entire flight profile,
> (4) A description of all major rocket systems, including structural,
> pneumatic, propellant, propulsion, ignition, electrical, avionics,
> recovery, wind-weighting, flight control, and tracking,
> (5) A description of other support equipment necessary for a safe operation,
> (6) The planned flight profile and sequence of events,
> (7) All nominal impact areas, including those for any spent motors and
> other discarded hardware, within three standard deviations of the mean
> impact point,
> (8) Launch commit criteria,
> (9) Countdown procedures, and
> (10) Mishap procedures.
>
> --- Carl
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