Shelf life og AP motors

Shelf life og AP motors

Post by LisaAS » Tue, 02 Nov 1999 04:00:00



i've been thinking about ordering some Aerotech motors so I won't be
disappointed at the launches by not being able to get what I need. How long do
the motors keep - if stored in their unopened bags?

Thanks,
Lisa

 
 
 

Shelf life og AP motors

Post by Peter Olivol » Tue, 02 Nov 1999 04:00:00


A very long time.  Especially reloads.  They are much more stable than black
powder.


Quote:

> i've been thinking about ordering some Aerotech motors so I won't be
> disappointed at the launches by not being able to get what I need. How
long do
> the motors keep - if stored in their unopened bags?

> Thanks,
> Lisa


 
 
 

Shelf life og AP motors

Post by Damian Russ » Tue, 02 Nov 1999 04:00:00


Quote:

> i've been thinking about ordering some Aerotech motors so I won't be
> disappointed at the launches by not being able to get what I need. How
long do
> the motors keep - if stored in their unopened bags?

> Thanks,
> Lisa

If they are stored properly and moisture free, you should be able to keep
them 3-5 years. I am flying motors purchased in 1994 without any problems

Damian Russo

 
 
 

Shelf life og AP motors

Post by Bob Kapl » Tue, 02 Nov 1999 04:00:00


Quote:

> i've been thinking about ordering some Aerotech motors so I won't be
> disappointed at the launches by not being able to get what I need. How long do
> the motors keep - if stored in their unopened bags?

Aerotech motors haven't been around long enough to answer this question. At
8-10 years they seem fine.

A long time ago in a TRA launch far far away I flew some old Composite
Dymamics and SSRS motors. The propellant was fine, but the delays and/or
ejection no longer functioned reliably. I don't know if this translates to
other motors or not.

        Bob Kaplow      NAR # 18L       TRA # "Ctrl-Alt-Del"

Kaplow Klips:   http://members.aol.com/myhprcato/KaplowKlips.html (baffle too!)
NIRA:           http://www.nira.chicago.il.us  NAR:    http://www.nar.org

 
 
 

Shelf life og AP motors

Post by Tom Binfor » Tue, 02 Nov 1999 04:00:00


Quote:

> > i've been thinking about ordering some Aerotech motors so I won't be
> > disappointed at the launches by not being able to get what I need. How
> long do
> > the motors keep - if stored in their unopened bags?

> > Thanks,
> > Lisa

> If they are stored properly and moisture free, you should be able to keep
> them 3-5 years. I am flying motors purchased in 1994 without any problems

> Damian Russo

I haven't had any problems with motors 10 years old.

Tom

 
 
 

Shelf life og AP motors

Post by Jamey #529 » Tue, 02 Nov 1999 04:00:00


Ahh, I can smell that Energon "L" burning right now, just thinking about
it....
Jamey #5295
Quote:

>I haven't had any problems with motors 10 years old.
>Tom

 
 
 

Shelf life og AP motors

Post by Tai F » Tue, 02 Nov 1999 04:00:00


I launched my Estes Phoenix on Estes D12-3 that I bought when I was a
freshmen (I am a senior in high school now) and launched them and no
problem. BP motors are bad at moisture so in wet places like Houston
they dont last long.... But AP motors they dont care about waters, you
soak BP motors in water its gone, but you soak AP motors in water it's
not going to do a thing. In fact the instruction of disposing AP motors
(according to NCR's instruction) is to stick it into the ground, nozzle
up, and fire them! So Since moisture isnt really a concern for AP
motors, it can last a VERY long time... I bet those AP motors that was
made when the composite propellant was introduced probably still works!
(Im talking those 1960's type of AP motors....)

--
Tai Fu
NAR# 76089 (National Assioation of Rocketry)
Website: http://web.wt.net/~taifu
Company: http://www.youngsfashion.com

 
 
 

Shelf life og AP motors

Post by John H. Cato, Jr » Wed, 03 Nov 1999 04:00:00


I agree, Tom.  I think they'd go twice that, even (remembering how me and
Earl Cagle flew one of my 17 year-old (at that time) Enerjet motors here
several years ago).  Heck, they're (the remaining ones) pushing 30 years old,
now.

With these 'hermetically sealed' ammo cans easily available everywhere, I
would think an AP motor could last a long time perfectly well.

-- john.

Quote:


>> > i've been thinking about ordering some Aerotech motors so I won't be
>> > disappointed at the launches by not being able to get what I need. How
>> long do
>> > the motors keep - if stored in their unopened bags?

>> > Thanks,
>> > Lisa

>> If they are stored properly and moisture free, you should be able to keep
>> them 3-5 years. I am flying motors purchased in 1994 without any problems

>> Damian Russo

>I haven't had any problems with motors 10 years old.

>Tom

 
 
 

Shelf life og AP motors

Post by Bruce Kirchn » Wed, 03 Nov 1999 04:00:00


Quote:

> How long do the motors keep - if stored in their unopened bags?<

I've got an I161 so old it came with a phenolic liner in a seperate bag. I
won't hesitate to use it.
--

Bruce Kirchner
TRA L2 #5888       NAR #69850
Michigan Team 1   HUVARS
Visit My Rocketry Home Page - http://members.aol.com/balthezar/index.html

 
 
 

Shelf life og AP motors

Post by Bob Kapl » Wed, 03 Nov 1999 04:00:00


Quote:

> A very long time.  Especially reloads.  They are much more stable than black
> powder.

Are they really? I've flown 30 year old BP motors. There just aren't any
compsite motors around that are old enough to compare that to.

        Bob Kaplow      NAR # 18L       TRA # "Ctrl-Alt-Del"

Kaplow Klips:   http://members.aol.com/myhprcato/KaplowKlips.html (baffle too!)
NIRA:           http://www.nira.chicago.il.us  NAR:    http://www.nar.org

 
 
 

Shelf life og AP motors

Post by Mark Johnso » Wed, 03 Nov 1999 04:00:00


Quote:



>> A very long time.  Especially reloads.  They are much more stable than
black
>> powder.

>Are they really? I've flown 30 year old BP motors. There just aren't any
>compsite motors around that are old enough to compare that to.

What, you don't want to fire a 1969 RDC Enerjet 8 out of your collection?

Of course, that's not entirely a fair test, given that the original
Enerjets
don't have an internal delay train. Of course, a 25 year old Enerjet
E24-7 would be pretty close...

 
 
 

Shelf life og AP motors

Post by John F. Stei » Thu, 04 Nov 1999 04:00:00


--

Quote:

>Of course, that's not entirely a fair test, given that the original
>Enerjets
>don't have an internal delay train. Of course, a 25 year old Enerjet
>E24-7 would be pretty close...

I have two of those!  Both hand numbered (no date code).  Early production
run...one in the 280's and the other in the lower 300's. Should we
experiment?

John Stein   KC4RLL
NAR #74335  SR  Ins  L1
S.E.A.R.S. #572

 
 
 

Shelf life og AP motors

Post by Neil Tarasof » Thu, 04 Nov 1999 04:00:00


If you store them in a vacuum they will last an eternity.
And for you smart guys out there, it is not a hoover, eureka and such. :-)

Neil Tarasoff

Quote:

> --

> >Of course, that's not entirely a fair test, given that the original
> >Enerjets
> >don't have an internal delay train. Of course, a 25 year old Enerjet
> >E24-7 would be pretty close...

> I have two of those!  Both hand numbered (no date code).  Early production
> run...one in the 280's and the other in the lower 300's. Should we
> experiment?

> John Stein   KC4RLL
> NAR #74335  SR  Ins  L1
> S.E.A.R.S. #572


 
 
 

Shelf life og AP motors

Post by Rick Dickinso » Thu, 04 Nov 1999 04:00:00


Quote:

>If you store them in a vacuum they will last an eternity.
>And for you smart guys out there, it is not a hoover, eureka and such. :-)

Won't there be some outgassing?  Also, wouldn't vacuum storage eliminate
the buffer effect of the atmosphere on the temperature of the grain?  Light
falling on one side of the motor would heat that side, and the other side
would not be heated evenly.  Couldn't such uneven temperature cycling lead
to stress fractures in the grain?

Maybe store them in an opaque thermos bottle filled with a noble gas....

 - Rick "Xenon, Warrior Princess"***inson

--
If you draw a Star of Baphomet and drop a vertical line from the tip of
one horn to intersect the goat's ear, the ratio of the distance from the
tip of the other ear to the point of intersection and the distance between
the eartips is half the golden ratio.  -- Peter da Silva, in ASR

 
 
 

Shelf life og AP motors

Post by bob fortun » Thu, 04 Nov 1999 04:00:00


Quote:

> If you store them in a vacuum they will last an eternity.
> And for you smart guys out there, it is not a hoover, eureka and such. :-)

> Neil Tarasoff

Reminded me of a joke:

A blonde was playing Trivial Pursuit one night. She rolled the dice
and landed on "Science & Nature." Her question was, "If you are in a
vacuum and someone calls your name, can you hear it?"

She thought for a moment and then asked, "Is it on or off?"