[AR] Re: dynamic stability
- From: r.hagensick@xxxxxxxxx
- To: arocket@xxxxxxxxxxxxx
- Date: Thu, 21 Aug 2014 13:21:11 -0500 (CDT)
Carl,
I would be happy to send you a copy of mine if you want to see what you need to
provide to the FAA.
Richard Hagensick
----- Original Message -----
From: Carl Tedesco <ctedesco@xxxxxxxxxxxxxx>
To: arocket@xxxxxxxxxxxxx
Sent: Thu, 21 Aug 2014 12:28:21 -0500 (CDT)
Subject: [AR] Re: dynamic stability
Thanks Richard, but this is for a liquid bi-propellant rocket, which I
don't believe Tripoli allows.
This is for the university rocket project I mentor --- SDSU. I just
looked into Rocksim Pro and it is $1000 which is more than we can
afford. Do any Arocketeers have Rocksim Pro and would be willing to help
out a University team.
--- Carl
On 8/20/2014 6:30 PM, Richard Hagensick wrote:
> 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
>
>
>
--
Carl Tedesco
Flometrics, Inc.
5900 Sea Lion Place, Suite 150
Carlsbad, CA 92010
tel: 760-476-2770 ext. 515
fax: 760-476-2763
ctedesco@xxxxxxxxxxxxxx
www.flometrics.com
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