[AR] Re: dynamic stability
- From: "Richard Hagensick" <r.hagensick@xxxxxxxxx>
- To: <arocket@xxxxxxxxxxxxx>
- Date: Wed, 20 Aug 2014 20:30:37 -0500
If you belong to Tripoli Rocketry they have a Class 3 committee that will do
the analysis for you and provide you with the paperwork you need to file your
permit. They use Rocksim Pro. I submitted mine to the FAA for a 150K launch
at BALLS this year.
Richard Hagensick
-----Original Message-----
From: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx] On
Behalf Of Monroe L. King Jr.
Sent: Wednesday, August 20, 2014 7:44 PM
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: dynamic stability
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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