[AR] Re: dynamic stability
- From: "Monroe L. King Jr." <monroe@xxxxxxxxxxxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Wed, 20 Aug 2014 18:34:15 -0700
Good Luck at BALLS!
Monroe
> -------- Original Message --------
> Subject: [AR] Re: dynamic stability
> From: "Richard Hagensick" <r.hagensick@xxxxxxxxx>
> Date: Wed, August 20, 2014 6:30 pm
> To: <arocket@xxxxxxxxxxxxx>
>
>
> 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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