[AR] Re: dynamic stability
- From: "Richard Hagensick" <r.hagensick@xxxxxxxxx>
- To: <arocket@xxxxxxxxxxxxx>
- Date: Thu, 21 Aug 2014 12:44:23 -0500
I hope to change their minds as I want to try liquids next. They have actually
had a liquids launch at BALLS under Tripoli already. You just need to get the
BOD to approve it. I plan on talking to them at BALLS this year.
I put a 0.4 degree cant on my fins to get spin stability to make the FAA happy.
To do this you do need to do some CNC work to get that kind pf precision on
you fin mounts.
Richard Hagensick
-----Original Message-----
From: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx] On
Behalf Of Carl Tedesco
Sent: Thursday, August 21, 2014 12:28 PM
To: arocket@xxxxxxxxxxxxx
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
Other related posts: