>I have about 100 Estes engines (size A, B and C) stored in a dry ammo
>box. They have been there for over 6 years. I called Estes and someone
>stated that engines have no shelf lift, therefore they all should be
>The engines were stored laying flat (horizontally). Since some solids
>behave as liquids over time and sag does any one know if these engines
>are still any good, or still safe?
I had some Centuri Engines that were buried in my Launch kit for almost
20 years, when I drifted away to college and work. When I resumed
Rocketry, I found these engines and tried to use them.
The Thrust appreared to operate normally. The rockets flew in prime
form. However, the ejection charge failed to have adequate force on each
of the three flights that I attempted. The result was a nominal repair
task, in each case. One of the models I flew with these was a re-creation
of the old Centuri model "The Point." The model's conic airframe serves
as it's own parachute, normally with the ejected engine keeping the attitude
correct for recovery. The only engine recommended for it was the B4-2.
It keeps it from arc-ing over at apogee.
On the topic of engines, 20 years is a long time to be sitting and
gathering dust. Yet the thrust operation was not a problem. I think
that if the engines get to be over 10 years old, I will start to become
cautious about whether or not the ejection charge is still "up to snuff."
(no .sig yet)