[AR] Re: "How Hard Can It Be" rocket episode
- From: Bill Claybaugh <wclaybaugh2@xxxxxxxxxx>
- To: "arocket@xxxxxxxxxxxxx" <arocket@xxxxxxxxxxxxx>
- Date: Tue, 19 Nov 2013 13:18:07 -0500
My impression is that this is not quite correct for large store bought motors
and careful builders: big store bought motors are expensive enough to make
getting them back worthwhile for most hobbyists.
Since I build my own--and since I combine the motor and airframe--I pay only
the direct cost of materials and avoid the airframe altogether, which cost is
far less than the full marked up cost of motors and airframes. That makes
recovery much less economic to me (especially since the fins and nozzle
typically survive impact, meaning only the tube and bulkhead require
replacing); even so, it is worth recovering the electronics: a simple video
telemetry system can easily approach $2000, including hardware.
Bill
Sent from my iPhone
On Nov 19, 2013, at 12:41, "Monroe L. King Jr." <monroe@xxxxxxxxxxxxxxxxxx>
wrote:
> This speaks volumes to me about the state of the art in rocketry.
> Rockets are not flown for their data or telemetry. It's all about the
> big whoosh and that's pretty much it. Why even bother with recovery as
> none of the rockets fly twice. Get live telemetry and just get the CG
> set for flat spin and let her go. Have a sliding weight/payload that
> moves the CG back after apogee.
> Ballistic anyway as far as I can tell- I know of 3 of these same
> rockets never found at black rock.
>
>> -------- Original Message --------
>> Subject: [AR] Re: "How Hard Can It Be" rocket episode
>> From: David Weinshenker <daze39@xxxxxxxxxxxxx>
>> Date: Tue, November 19, 2013 9:47 am
>> To: arocket@xxxxxxxxxxxxx
>>
>>
>> Uwe Klein wrote:
>>> George Herbert wrote:
>>>> 50 foot long bright colored streamer. Small weight on one end. SD card in
>>>> the middle, in a little pouch...
>>>
>>> When do you separate the storage?
>>>
>>> You want to have data to the last nanosecond if possible.
>>> Also the crash site unusually is the easiest to find.
>>>
>>> Just harden the storage to a level that makes
>>> the surrounding vehicle into a sufficiently effective
>>> crash zone.
>>
>> Maybe just put the streamer on the memory chip, and wrap
>> it up within the electronics package, so that if it becomes
>> dislodged on impact you can find it easily in the debris field.
>>
>> -dave w
>
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