Shelf life of rocket engines

Shelf life of rocket engines

Post by Stephen DeArma » Wed, 30 Jul 1997 04:00:00



Quote:

> Does anyone have any experience attempting to fire model rocket engines
> (Estes and FSI E60's) that are approximately 20 years old?  Or does anyone
> have a feeling for their shelf life?  If so, I would appreciate your
> comments.   jim

     I've fired them as old as 6 years with no trouble. The longest I've
heard of is 18 years. If they have been well kept in a constant
temperature and low humidity they are probably o.k.,but I would test one
before putting it in a rocket I cared about.

                       Trust No One,
                          Randy

 
 
 

Shelf life of rocket engines

Post by Buzz McDermot » Wed, 30 Jul 1997 04:00:00


Quote:

> Does anyone have any experience attempting to fire model rocket engines
> (Estes and FSI E60's) that are approximately 20 years old?  Or does anyone
> have a feeling for their shelf life?  If so, I would appreciate your
> comments.   jim

If you were to check the FAQ section on Model Rockets you would find the
answer to your question. You would note the question about using old
motors is also in the first section (table of contents).

Okay, so now that the gentle reminder to RTFM is out of the way....

Black powder motors are suseptable to temperature cycling and high
humidity. Aside from that, they have a very long shelf life. We get
regular posts about someone using their 10/15/20 year old motors. That
is, IF the motors had always been stored inside their homes, in a
relatively controlled climate (ie: temp stayed above freezing and below
100 the WHOLE time).

Motors that have been stored in attics, garaqes, storage sheds, etc.,
have no doubt been temperature cycled numerous times and will be more
likely to fail. Estes D12s, FSI F100s and FSI E60s are most suseptable,
I here. Also Estes B14s and C5s. Other FSI and Estes motors will have
smaller increases in failure rates than the D12s and such.

Buzz McDermott

 
 
 

Shelf life of rocket engines

Post by Bob Kapl » Wed, 06 Aug 1997 04:00:00


Quote:

> humidity. Aside from that, they have a very long shelf life. We get
> regular posts about someone using their 10/15/20 year old motors. That

I can raise that to at least 26 years, and have stuff that is now 28 years
old that I could test if I really wanted to bother. I've seen NO signs of
ageing of BP motors properly stored...

Quote:
> is, IF the motors had always been stored inside their homes, in a
> relatively controlled climate (ie: temp stayed above freezing and below
> 100 the WHOLE time).

        Bob Kaplow      NAR # 18L       TRA # "Abort, Retry, Fail?"