AeroTech Open Thread

Discussion in 'Propulsion' started by ATGM, May 16, 2015.

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  1. May 20, 2019 #3,091

    BF Rockets

    BF Rockets

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    Imma order me some extra 38mm hardware just to hoard it. lolz
     
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  2. May 20, 2019 #3,092

    gldknght

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    I'm one of those guys that would probably NOT pay extra for laser engraving, can't see it when it's inside the rocket anyway...but I would definitely buy one of those purple ones!

    You are also certainly correct about the initial setup cost for turning out these cases.
     
  3. May 20, 2019 #3,093

    gldknght

    gldknght

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    Why do I have to explain my reasoning to you, or even have reason? They are my property and I will d**n well do what ever I please with them!
     
    Last edited: May 20, 2019
  4. May 20, 2019 #3,094

    grouch

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    Or you could just buy the ones I have for sale and hoard those like I've been doing. It's not as fun as it sounds. They deserve to be in the wild!
     
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  5. May 20, 2019 #3,095

    Banzai88

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    I'm guessing that you haven't seen the absolutely ridiculous prices that they actually sell for on ebay? Usually somewhere at 10-20% more than a new one, and certainly much more than the original cost. Can't really explain it, other than people wanting vintage stuff, or different stuff than everyone else....and they're willing to pay for it.
     
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  6. May 21, 2019 #3,096

    Tobor

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    @ jd2cylman,
    If you do a run of 38s in Mauve with Chartreuse closures, then I'll take a 360, 720, 1080 and a 1320. Of course that is conditional on the production of a 38 RAS floating forward closure in Purple! Sorry but I'm picky like that....
     
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  7. May 21, 2019 #3,097

    jd2cylman

    jd2cylman

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    Still not Carl... ;-)

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    Actually all the cases are laser etched now. AT did away with the sticky labels some time ago and joined the 21st century with Laser etched labels.
    Only Dr rocket offered the personalized etching.
     
  8. May 21, 2019 #3,098

    BayouRat

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    Still don't know what your looking for or if it even exist? Aerotech has changed there closures a few times since Dr. Rocket has been around. Whatever your looking for probably doesn't exist any more.
     
  9. May 21, 2019 #3,099

    BayouRat

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    I've not seen that. Do you have an example? The only ones I've seen go for more are the special one off anodizing. Other than that I don't get the hoarder mentality. I suspect it's supply and demand. I sold all my commercial stuff years ago.
     
  10. May 21, 2019 #3,100

    dhbarr

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    Apogee will custom laser etch for you.
     
  11. May 21, 2019 #3,101

    jd2cylman

    jd2cylman

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    Still not Carl... ;-)

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    I didn't know this. Luckily for me I have a friend who purchased a 80w laser. He likes experimenting on stuff for me.
     
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  12. May 21, 2019 #3,102

    ROhmen

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    TAKE MY MONEY!!!!!
     
  13. May 21, 2019 #3,103

    Dudeman247.

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  14. May 21, 2019 #3,104

    CzTeacherMan

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    On a completely different note...
    Does Aerotech make "demo" motors? Like a transparent or cutaway plastic motor? Something I could use to teach/demo with?
     
  15. May 21, 2019 #3,105

    Steve Shannon

    Steve Shannon

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    I’ve mentioned this to Gary before, the possibility of obtaining inert propellant grains. They’d be easy enough to turn from wood or plastic I guess.
     
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  16. May 21, 2019 #3,106

    dhbarr

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    Someone on the forum has cast inert grains from table salt.
     
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  17. May 22, 2019 #3,107

    beeblebrox

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    No, you don't need to buy huge quantities, the tubing isn't the expensive part anyway it's the machining of the threads... You can buy small quantities of tubing from this supplier. They (Rough) cut to length too. So, if you want that Nike Fin Can made out of 6061...
    https://www.onlinemetals.com/en/buy/material?q=:relevance:Material:Aluminum:Alloy:6061:Shape:Round+Tube&checkbox=on#
     
  18. May 23, 2019 #3,108

    WILDMANRS

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  19. May 23, 2019 #3,109

    Worsaer

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  20. May 23, 2019 #3,110

    beeblebrox

    beeblebrox

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    Not true, at least for some things, I have tubing from there that is the exact stuff used for 38mm reload casings. Measured it and compared to an Aerotech case. (I was given those tubes for free and will most likely use them for something else...) Onesy twosy machining is too expensive... would be worth it if there were larger quantity. .
     
  21. May 23, 2019 #3,111

    WILDMANRS

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    It might measure the same, but its not the same material.
     
  22. May 23, 2019 #3,112

    tfish

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    98mm demo.jpg

    salt...

    Tony
     
  23. May 23, 2019 #3,113

    ttabbal

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    You're making me want to run a plaque on the CNC and send it to you... :)
     
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  24. May 24, 2019 #3,114

    tOD

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    I'm planning a flight on a K535 disposable with a maximum delay of 14 seconds. A rough simulation puts my optimum delay at around 16 seconds. In this case is the best thing to do not use any ejection charge at all in the motor and just rely on the apogee charge from the altimeter? A backup would be nice but in this case looks like it might do more harm than good.
     
  25. May 24, 2019 #3,115

    Steve Shannon

    Steve Shannon

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    I’m over it.
     
  26. May 24, 2019 #3,116

    rharshberger

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    A friend just picked up my new hardware from SBR/Fusion Rockets....a 75/7680 with RAS and Rear closure. 580417071.jpeg
     
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  27. May 25, 2019 #3,117

    BSNW

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    You are good. More people than we can count, run on one altimeter. They are WAY more reliable than motor ejection. Just take your time on your prep and double check your work. Enjoy that K535! Have fun!
    Andrew
     
  28. Jul 23, 2019 #3,118

    spence

    spence

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    HI Charlie-

    I recently flew an M1350W DMS - Followed the directions religiously...The Motor spit out the forward closure when it came up to pressure (still on the rail), Needless to say the rest if the "event" was not pretty, My L3 was pretty much toast - literally. I have a second motor on order and am now a bit gun shy to use it in the coming rebuild. Is there a known cause for this? I used the enclosed epoxy, etc ---to the directions. It seemed very secure right up to the point that it was...not.

    ideas?

    Steve
     
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  29. Jul 23, 2019 #3,119

    jmuck78

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    I know this question wasn't directed at me, but I had the same experience last year on my L3 flight, as a matter of fact. I also followed the directions carefully, but I believe there was an ambiguity in the instructions at the time where the instructions don't indicate how much the forward closure needs to be recessed into the motor case. It turns out, there needs to be at least a 1 inch thick ring of epoxy. Mine ended up being much less than that even though it felt like the forward closure was in as far as it would go.

    What rocket were you using the motor in? I was flying a wildman extreme and used three centering rings. The forward closure failure failed with enough forced that it essentially deployed the ebay and everything "north" of it out of the way. The damage ended up being confined to the booster section forward of the forward-most centering ring, resulting in a fairly straightforward repair. Good luck!
     

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  30. Jul 23, 2019 #3,120

    spence

    spence

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    I was flying a madcow 5.5 inch AGM. The payload section was blasted clear. The bottom half was incinerated. Same tremendous force . I had triple bulk head. Which got cracked but did not get penetrated. The steel U bolt was flattened and one .25 inch rod inside the Avbay snapped. I had the closure in as far ( as I thought it would go) without hitting it with a mallet .


    I feel your pain
     
    Last edited: Jul 23, 2019

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