[RocketsNW] Altimiter bay design questions

[Hammer]

Why not use a reed switch?

robert

kmcgoffin at worldaccessnet.com wrote:
> Break wires:
> All depends on the details.  Used correctly, this is an extremely reliable
> way to detect lift-off.  Used incorrectly...just don't go there.  ;-)
>
> Rocketry being a 'magic art', the philosophy of "binding down unwanted
> outcomes" applies.  Personally, I'd NEVER use break wires(more
> technically, continuity sensing--wires don't actually have to break) with
> any kind of rocket/launcher interface that allowed more than slight rocket
> movement on the pad(use rail, not rod).
>
> Common mistakes include not knowing that fire conducts electricity,
> allowing too violent a yank, poor circuit/physical design, and even
> alligator clips hanging up on fins.
> +McG+
>
>
>   
>> 1)
>>
>> E-match to wiring harness: What has worked for people in attaching
>> ejection charge e-matches to an altimeters igniter circuits?
>> 2)
>>
>> In my design the payload bay+nose cone separates from the rest of the
>> rocket. The problem is where to put the parachute. One solution is to have
>> a narrower diameter “canon” attached to either the top or bottom of
>> the payload bay. For the top of the payload bay case, the canon would
>> project into the nose cone. It’s difficult to ground test how this nose
>> cone/canon separation would work statically. Any pointers?
>> 3)
>>
>> Break wires: What are the experiences with break wires for triggering
>> launch detect?
>> -B
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>
>
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