> 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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>>>
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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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>
>
>
> --
> 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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