[roc-chat] Re: E-bay machine screw ?
- From: Lakestake Rocketry <lakestake@xxxxxxxxx>
- To: roc-chat@xxxxxxxxxxxxx
- Date: Tue, 31 May 2011 14:00:10 -0700
It is not only flight stresses that need to be considered. Make sure the
airframe is straight, stiff and can take landing on the hard lakebed under a
stripped 'chute.
Good luck!
Matt
On May 28, 2011 10:05 AM, "Allen H Farrington" <allen.farrington@xxxxxx>
wrote:
> I do this all the time. Just make sure that the backing for the screws is
sound.
>
> Allen
> Terseness and mis-spelling courtesy of my iPhone
>
> On May 28, 2011, at 8:47 AM, John Howard <John.Howard@xxxxxxxxxxxxxx>
wrote:
>
>> Hi All,
>>
>> I've been a ROC member for a couple years and lurking on roc-chat for
about the same. I am finishing a 4” fiberglass Madcow Nike Smoke for NSL/
ROCstock and have a hardware question.
>>
>> The Nike is one of two L2 rockets I am bringing with the hope of dong my
L2 Cert flight. I have split the airframe in half and added an electronics
bay built from a fiberglass coupler tube. I am hoping to connect it all
together with machine screws. To load the ejection charge, I’ll unscrew the
upper airframe, load them, then re-attach. The charge will eject the
parachute out with the nosecone. Everything is built and ready to paint. I
have drilled 8 pilot holes to mount the coupler tube to the bottom half, and
four for the upper half.
>>
>> Do you think 4-40 machine screws will be strong enough, or should I use
6-32?
>>
>> Looking on the web, it looks like 4-40 screws would have enough strength,
plus there will be 8 on the bottom screwed into standoffs/nuts. I could also
epoxy the E-bay in, but I also have a open coupler tube with the same pilot
holes so I could launch the rocket with a motor and motor ejection charge.
The “keep it simple stupid” version.
>>
>> Thanks ahead of time, and see you in two weeks!
>>
>> John Howard
>>
>>
>>
>> Sent from my iThing
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