PML's HAMR Motor Retainer Questions.

K'Tesh · Sep 28, 2015

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

Samuron · Sep 28, 2015

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!

K'Tesh · Sep 28, 2015

Doh! 38mm

PBic · Dec 7, 2017

K'Tesh said:
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.

PML's HAMR Motor Retainer Questions.

Help Support The Rocketry Forum:

K'Tesh

.....OpenRocket's ..... "Chuck Norris"

Samuron

Well-Known Member

K'Tesh

.....OpenRocket's ..... "Chuck Norris"

PBic

Well-Known Member

Similar threads

Latest posts

PML's HAMR Motor Retainer Questions.

Help Support The Rocketry Forum:

K'Tesh

.....OpenRocket's ..... "Chuck Norris"

Samuron

Well-Known Member

K'Tesh

.....OpenRocket's ..... "Chuck Norris"

PBic

Well-Known Member

Similar threads

Latest posts

Join the conversation!

Join today and get all the highlights of this community direct to your inbox. It's FREE!