[AR] Re: dynamic stability
- From: Bill Claybaugh <wclaybaugh2@xxxxxxxxxx>
- To: "arocket@xxxxxxxxxxxxx" <arocket@xxxxxxxxxxxxx>
- Date: Thu, 21 Aug 2014 12:47:41 -0600
Richard:
If you are willing to do it would be helpful to me to have a copy of a waiver
request that has been granted.
Thanks,
Bill
Sent from my iPhone
On Aug 21, 2014, at 12:21, r.hagensick@xxxxxxxxx wrote:
> 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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