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  1. #1
    Join Date
    27th March 2013
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    PML's HAMR Motor Retainer Questions.

    I'm working on an upscale of the Estes Goblin, and I've got a PML HAMR Motor Retainer... Somewhere in here. Problem is I can't find it for now.

    I know that it only needs 3/8" of exposed motor tube to attach to. So, that's not a problem. What I don't know is how much does it add to the length of the rocket (with and without motor installed). I'm hoping to be able to have a reloadable motor casing installed (forget about the nozzle for now) and still allow the rocket to sit on all four fins.

    Thanks!
    Jim

    Dreaming of making the rockets I dreamed of as a kid (and then some).


    NAR L1 Cert flight: Sheridan, Oregon, USA. Sept. 19, 2015. Flew Deep Space OFFl on an I357T-14A Blue Thunder

  2. #2
    Join Date
    4th November 2009
    Location
    Arizona
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    121
    You didn't mention the motor size; I only have one in 54mm.

    My measurements:

    without ring, no motor - .75"
    with ring no motor - .855"
    with ring, AT casing - .881"

    You caught me just in time; it's getting glued into a 4" photon disruptor today!


  3. #3
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    27th March 2013
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    Doh! 38mm
    Dreaming of making the rockets I dreamed of as a kid (and then some).


    NAR L1 Cert flight: Sheridan, Oregon, USA. Sept. 19, 2015. Flew Deep Space OFFl on an I357T-14A Blue Thunder

  4. #4
    Join Date
    27th November 2017
    Location
    Eugene, OR
    Posts
    28
    Quote Originally Posted by K'Tesh View Post
    I'm working on an upscale of the Estes Goblin, and I've got a PML HAMR Motor Retainer... Somewhere in here. Problem is I can't find it for now.

    I know that it only needs 3/8" of exposed motor tube to attach to. So, that's not a problem. What I don't know is how much does it add to the length of the rocket (with and without motor installed). I'm hoping to be able to have a reloadable motor casing installed (forget about the nozzle for now) and still allow the rocket to sit on all four fins.

    Thanks!
    Jim
    I know this is years old, but am answering in case someone (just like me!) stumbles onto this thread. The 38mm HAMR length w/an Aerotech RMS installed is 0.825", and empty is 0.725", both sans the motor nozzle. Also, the mounting depth I measured for the exposed motor tube came out to 0.333", whereas PML instructions state 0.375 (3/8"). I Found this thread looking for drawings of the HAMR.

    Paul B.

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