On 15/02/2012, at 12:17 AM, Chris Gough wrote:
> On Wed, Feb 15, 2012 at 12:27 AM, Florin Mingireanu
> <
address@hidden> wrote:
>> Does this imply that UAVdevboard and Ardupilot Mega are also under MTCR/ITAR
>> or there is something special to paparazzi that places it under MTCR/ITAR?
>
> I'm not aware of any reason why paparazzi hardware would be "a
> dual-use good" and the other open source autopilots would not be.
>
> But the assessment process is opaque. Maybe they just didn't like my shoes :)
>
> Chris Gough
>
>> On Tue, Feb 14, 2012 at 3:22 PM, Chris Gough <
address@hidden>
>> wrote:
>>>
>>>> The best thing about open source software an hardware (at lease with
>>>> GPL) is
>>>> that it is outside of MTCR and ITAR restrictions.
>>>
>>> I have formal advice contradicting this from the Australian Defence
>>> Department (Defence Export Control Office).
>>>
>>> Their technical assessment found that paparazzi autopilot hardware is
>>> a "dual-use good" under MTCR. It took me ~9 months and >20 submissions
>>> to get a license to export it.
>>>
>>> Don't piss them off, they have a big stick.
>>>
>>> Chris Gough
>>>
>>>
>>>
>>>> Cheers,
>>>>
>>>> Sent from my iPad mini.
>>>>
>>>> On 14/02/2012, at 11:58 PM, Florin Mingireanu
>>>> <
address@hidden> wrote:
>>>>
>>>> One way to do it is to not attempt any inertial correction during the
>>>> burn.
>>>> After the burn out roll/yaw/pitch stabilization can commence. You don't
>>>> have
>>>> a high g environment anymore. Also it helps if the rocket is inherently
>>>> not
>>>> planned to roll fast...
>>>> In this case I could see that an open source autopilot (like paparazzi)
>>>> could do the task of stabilizing the vehicle.
>>>>
>>>> Florin
>>>>
>>>> On Tue, Feb 14, 2012 at 2:56 PM, Bernard Davison
>>>> <
address@hidden>
>>>> wrote:
>>>>>
>>>>> The nominal burn time for the motors is 0.8-1.25 seconds.
>>>>> The 3" Sighter and the 5" Zuni motors have pretty similar burn times.
>>>>>
>>>>> We launch them at an angle of 70 degrees so they always land several
>>>>> kms
>>>>> away from us.
>>>>> It also helps protect us when the student payloads break off. Which
>>>>> happens from time to time with some of the designs.
>>>>>
>>>>> Cheers,
>>>>> Bernie.
>>>>>
>>>>>
>>>>> Sent from my iPad mini.
>>>>>
>>>>> On 14/02/2012, at 11:48 PM, Florin Mingireanu
>>>>> <
address@hidden> wrote:
>>>>>
>>>>> How long does the burn take? 2-3 seconds?
>>>>>
>>>>> Thanks,
>>>>> Florin
>>>>>
>>>>> On Tue, Feb 14, 2012 at 2:47 PM, Bernard Davison
>>>>> <
address@hidden>
>>>>> wrote:
>>>>>>
>>>>>> The launch is >70G ;-)
>>>>>> The thing goes from a compete standstill to >Mach 2 in 1 second.
>>>>>>
>>>>>> The rockets we usually use are surplus defense motors.
>>>>>>
http://www.asri.org.au/SSRP
>>>>>>
>>>>>> We did have a payload once that was going to try and maintain a lock
>>>>>> throughout the flight but it got buried. :-(
>>>>>>
>>>>>> Cheers,
>>>>>> Bernie.
>>>>>>
>>>>>> Sent from my iPad mini.
>>>>>>
>>>>>> On 14/02/2012, at 11:41 PM, Florin Mingireanu
>>>>>> <
address@hidden> wrote:
>>>>>>
>>>>>> Hello,
>>>>>>
>>>>>> Why doesn't the GPS keep lock during the ascent? I have seen GPS data
>>>>>> loggers for high power rocketry that keep lock during the ascent. What
>>>>>> type
>>>>>> of GPS module do you use?
>>>>>>
>>>>>> Best regards,
>>>>>> Florin
>>>>>>
>>>>>> On Tue, Feb 14, 2012 at 2:38 PM, Bernard Davison
>>>>>> <
address@hidden> wrote:
>>>>>>>
>>>>>>> Yep standard civilian GPSs have been flown. They lose position of
>>>>>>> course
>>>>>>> at launch but do acquire solution after the main parachute opens.
>>>>>>>
>>>>>>> Also the MEMS accelerometers have been flown and data logged.
>>>>>>>
>>>>>>> The major problem we've always faced is knowing what went wrong when
>>>>>>> things don't work and the thing is buried 5m underground and the
>>>>>>> rocket has
>>>>>>> turned itself into metal confetti.
>>>>>>> We've worked out what we believe Will be a survivable data storage
>>>>>>> module. Hopefully to be tested in the next year or so.
>>>>>>>
>>>>>>> At the moment were breaking the Lisa/L board up into smaller
>>>>>>> components
>>>>>>> and designing them to be rugged. I.e. positive locking connectors
>>>>>>> isolation
>>>>>>> on some switches and comms. Etc.
>>>>>>> We're also breaking the board into discrete task based "nodes" that
>>>>>>> can
>>>>>>> communicate via redundant CAN bus connectors. So in the future it
>>>>>>> would be
>>>>>>> possible to have a failure tolerant system. I.e. if you have a
>>>>>>> failure of a
>>>>>>> transceiver node, IMU node, flight computer node, CAN bus. Then it
>>>>>>> could use
>>>>>>> another node on the network.
>>>>>>> Of course that would need the appropriate software to be written for
>>>>>>> that kind of control.
>>>>>>>
>>>>>>> Cheers,
>>>>>>> Bernie.
>>>>>>>
>>>>>> _______________________________________________
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>>>>>>
https://lists.nongnu.org/mailman/listinfo/paparazzi-devel>>>>>>
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>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Florin Mingireanu
>>>>> Romanian Space Agency
>>>>> Str. Mendeleev 21-25, et. 5, sector 1, 010362 Bucuresti, ROMANIA
>>>>> office tel.
+40-21-316.87.22;
+40-21-316.87.23;
>>>>> cell:
+40-757-768971 (primary phone)
>>>>> fax
+40-21-312.88.04>>>>>
address@hidden>>>>>
http://www.rosa.ro
>>>>>
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>>>>>
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>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Florin Mingireanu
>>>> Romanian Space Agency
>>>> Str. Mendeleev 21-25, et. 5, sector 1, 010362 Bucuresti, ROMANIA
>>>> office tel.
+40-21-316.87.22;
+40-21-316.87.23;
>>>> cell:
+40-757-768971 (primary phone)
>>>> fax
+40-21-312.88.04>>>>
address@hidden>>>>
http://www.rosa.ro
>>>>
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>>>
>>>
>>>
>>> --
>>> .
>>>
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>>
>>
>>
>>
>> --
>> Florin Mingireanu
>> Romanian Space Agency
>> Str. Mendeleev 21-25, et. 5, sector 1, 010362 Bucuresti, ROMANIA
>> office tel.
+40-21-316.87.22;
+40-21-316.87.23;
>> cell:
+40-757-768971 (primary phone)
>> fax
+40-21-312.88.04>>
address@hidden
>>
http://www.rosa.ro>>
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>
>
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