How old was the oldest AT motor you've fired...

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AZ_Ron

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Hey all... I've got a collection of old single use motors, from 29mm to 54mm that are from the 80's...
Most are Aerotech, I've got a couple of US Rocket motors, Vulcans, etc... Anyone fired APCP motor of this vintage?
Anyone from Aerotech care to comment?

Thanks!

Ron
 

MClark

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I have a few PlasmaJets.
Ron, I’m sure you have a rocket we can try um in.
Got a 4” O from the same batch of propellant as the P that catoed in the Mercury Redstone at LDRS many years ago.
 

Johnly

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I was flying some 96 vintage G64 reloads at the last launch. Scored them up a bit and hit them with BKNO3.
I little sluggish to light, but not as bad as 10 year old redline motors. Put a 30 year old I300T on the test stand a while back and it lit easy and the delay accuracy was within the NFPA 1125 specifications. For that reason most of my recent motors purchases have been Blue Thunder. Have some old F32 and G55 that might be from the 80's.
PlasmaJet... Reminds me to give Randy a call to see how he is doing.
 

AZ_Ron

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LOL Mark... I know you've got some crazy old and rare motors floating around your place!
I plan on flying electronic deployment only, so the delay accuracy isn't a factor. More curious about
how those motors age. I've come across a couple of old White Lightning RMS loads that had swollen... slot down the middle is significantly tighter, and ends of grain are slightly bulged. Found a couple of delay elements that have slightly bulged ends.
 

Initiator001

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I flew an AeroTech 24mm E28 motor, vintage 1988, a few years ago.

Worked fine, no issues.
 

burkefj

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Last year I flew some 1995 G-12 32mm motors, four worked normally, two burned at half the rate of normal. Also an F16 that burned for about 25 seconds with almost no thrust
 

AeroTech

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They are generally good if they have been tightly sealed from moisture. White Lightning, Redline and Mojave Green are the most suceptible.
 

cbrarick

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flew a few motors from 1991, even WL. they were still in their sealed bags. Had to peel the grains on the WL, but sometimes you do that anyway.
 

green dragon

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flew a J125 from 1990 at the Novemebr 2020 launch, no problems ( electronic eject and ejection charge removed, so unsure about bonus delay or ? ), did have a slightly longer burn time
 

J Blatz

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Derek - I think it’d run just fine.

A real beauty. That aluminum cased version was quite rare.

And Green Dragon, nice to see you here man.
 

AZ_Ron

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I've got a bunch of SU motors dated 1986-1988... I'm going to run a borescope up through the nozzle and see how the grain(s) look, if they're swollen, etc...
 

green dragon

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@green dragon How did you store the J125? Any trouble getting it to light? Makes me wonder if I should remove the charge on this circa 1990 I65W and give it a go.
Nothing special storage wise - been in my storage magazine in unheated garage. No way to really scuff up the grains on single use motor, so we just used a daveyfire and short thermalite piece - took a few seconds to light up but flew fine.
Older Aerotech motors are notorious for the 'bonus delay' syndrome, so if you have electronics, I would say dump the powder out and light it up :) . On ours, no plugging the delay well with epoxy or anything, we dumped the powder out, put an Estes igniter plug in the touch hole, packed to the top with dogbarf wadding and taped over the top.
NO reason most older motors should not fly fine - I've had a few reloads that rains swelled enough to be unusable ( or need to be cut down ),but single use where the case keeps grains from swelling too much should be fine.
Since getting active again flying with my boys, we burned quite a few old motors, including some Kosdon E40s I;ve had since early 90's,couple Ellis Mountain motors. We did try to fly an older E15w and could not get it to light,probably oxidized and the nozzle is so small it's hard to get much of an igniter in there - we'll try it again with straight thermalite and see what happens.
 

Retrospace101

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Man looking at these motors I feel like I wanna collect one...Where do you think one can score a vintage AT Motor? (I know it may be a bit hard/expensive)
 

Art Upton

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Man looking at these motors I feel like I wanna collect one...Where do you think one can score a vintage AT Motor? (I know it may be a bit hard/expensive)
Getting it mailed legally is the problem.
 

deandome

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How would I go about scuffing up a 2009-2010 redline? are there other propellants that are finicky to light when they're about a decade old?
 

DragonRocketry

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How would I go about scuffing up a 2009-2010 redline? are there other propellants that are finicky to light when they're about a decade old?
I use brass bore brushes or spiral up a piece of sand paper.
 
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