Compatibility of Gorilla hardware and classic AMW hardware.
About 4 years ago Paul Robinson and I had a discussion about cross compatibility of our hardware. Since AMW was the defacto standard in snap ring hardware I agreed to use the same specifications of drawn aluminum tubing (1/2 mil spec tolerence) that AMW used. The dimensions (length, placement of internal snap ring grooves, and outer thrust ring grooves) of Gorilla aluminum cases are identical to the AMW aluminum cases. The differences in the total hardware package are listed below.
38mm
All 38mm hardware (cases and nozzles) is identical to AMW hardware with the exception of the forward closure (slightly different).
54mm
All 54mm hardware (cases only and 2550 forward closure) is identical to AMW hardware with the exception of the nozzles (slightly different) and forward closures (slightly different).
75mm
All 75mm hardware (cases and nozzles) is identical to AMW hardware with the exception of the forward closures (slightly different).
98mm
All 98mm hardware (case and nozzle) is identical to AMW hardware with the exception of the forward closure (slightly different).
To All,
Upon formal request from two manufacturers and with a comprehensive study of
all documentation, we have decided to grant full cross hardware
certification for Gorilla Rocket Motors and limited cross hardware
certification for Loki Research to be used in AMW standard specification
cases.
The major point to this action is the recognition of the Animal Motor Works
(tm) hardware, as specified from or about 2004, as a 'STANDARD'. This
action is not without precedent as this closely matches the RMS 'standard'
design of hardware, certified many years ago. The one difference to this
action is it is considered strictly "non-cooperative" in that AMW is not, at
this time, a "first hand" party to this action, hence our designation of
this as a "Non-Cooperative" certification. This is commensurate to the 2004
certification of CTI reloads in RMS hardware. As such, if either of these
two manufacturers provide and promote a reload for a motor utilizing AMW
manufactured/sanctioned parts, that manufacturer is solely responsible for
the use and continued suitability of that use, as well as warranty actions.
The following specifications are to be used to determine a valid member of
"AMW Case Family" hardware and its suitability to be used in this capacity.
1. 38mm: 1.310" ID x 0.095" wall x 1.500" OD
38/390: 9.80" long
38/640: 14.55" long
2. 54mm: 1.939" ID x 0.093" wall x 2.125" OD
54/1050: 12.85" long
54/1400: 15.85" long
54/1750: 19.35" long
54/2550: 28.66" long
3. 75mm: 2.753" ID x 0.116" wall x 2.985" OD
75/3500: 19.60" long
75/6000: 30.90" long
75/7600: 40.90" long
All AMW case family hardware is to match the Mil Spec produced tubing and
Mil Spec class 3 finishing, as set out by the original designer and as
originally certified, and is only currently approved for supply/manufacture
by Animal Motor Works and Gorilla Rocket Motors (at this time). Any changes
in either manufacturer's cases or closures will freeze this certification to
an immediate "before date" classification for that part. Any additional
hardware sizes to be added to this list will be processed upon official
request and after the required study/testing.
The specific details of the cross certifications granted, at this time, are
as follows, by manufacturer.
Gorilla Rocket Motors
As Gorilla Rocket Motors was based directly upon the AMW hardware set, as
being both raw material sourced and machined in one of the many authorized
shops used for this line, the specifications are considered identical. Due
to this fact and as long as that continues, Gorilla Rocket Motors is granted
full non-cooperative cross certification and the following four (4) points
apply:
1. Gorilla Reloads are fully compatible in AMW case family hardware to
include mixing and matching the forward closures as long as they are the
flat 'hockey puck' profile AND it matches the reload
requirements/instructions. If the Gorilla 54MM "delay column style" smoke
charge is used, only the Gorilla forward closure is authorized.
2. AMW reloads may be used in Gorilla Hardware BUT any hardware issues with
an AMW reload in a Gorilla case/hardware will be resolved by Gorilla as the
'manufacturer' as they are (with the flyer), the responsible party in this
action. Gorilla shall notify this office and the flyers if and when they
wish to invalidate this clause.
3. Great care needs to be taken by the flyer to utilize the correct nozzle
as specified in the reload instructions. Gorilla will continue to insure
they clearly indicate their nozzle requirements by reload AND case in the
required instructions.
4. Any bilateral changes in hardware specs, to invalidate this design
similarity will require Gorilla to immediately notify this office and any
and all possible users.
In closing, this office understands there will be those that may consider
this action, during a time of unfortunate loss at Animal Motor Works, as
predatory. I assure the members this action has been in study and
development by both manufacturers for a few years and was not precipitated
by that loss although the timing for the continued pursuit of this action is
strictly theirs. There had been ongoing contact by these manufacturers with
AMW personnel, for a few years now, for an official cooperative standard,
but that was never achieved. When the situation at Animal Motor Works is
settled, we urge these manufacturers to continue discussion towards making
this a cooperative universal hardware standard.
H. Paul Holmes
Chairman, Tripoli Motor Testing
Letter from Paul Holmes (Chairman, Tripoli Motor Testing) on Gorilla/AMW cross certification
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