News Release by A*****ech Consumer Rocketry
Wednesday, May 21, 2008
As a result of field experience and customer feedback, A*****ech is now
requiring the use of aluminum "forward seal disks" with current
production reload kits intended for use with 54/1706, 75/5120 and all
98mm RMS™ hardware.
The specific kits affected are:
54/1706 Motor Hardware
K185W, K550W, K1100T, K695R, K513FJ, K805G
75/5120 Motor Hardware
L1420R, M1297W, M2030G
98/2560-15360 Motor Hardware
K458W, K650T, K680R, K1999N, L952W, L1300R, L1500T, M1419W, M1600R,
M2100G, M2400T, M750W, M1939W, M2000R, M2500T, N2000W
The 54mm seal disk was announced last year (P/N 54FSD) and has been
required for use with all 54/2560 and larger reload kits, the 75mm disk
(P/N 75FSD) is currently being used with all 75/6400 and 75/7680
reloads, and the 98mm disk (P/N 98FSD) is a new machined aluminum part
that will replace the phenolic disk currently ****pping with 98mm reload
kit production.
A small percentage of customers using some of these reload kits have
re****ted a "blister" forming on the exterior of the forward end of the
motor case. The blister is caused by excessive heating due to a small
amount of hot gas passing between the case and liner during motor
operation. In addition to weakening the casing, the blister can
interfere with the proper fit of the case in the rocket's motor mount
tube.
In the past, A*****ech has implemented the use of forward seal disks with
its longest 29mm, 38mm and 75mm RMS motors. The seal disk is a narrow
aluminum ring that seals to the inside of the phenolic liner with a
cir***ferential o-ring. The motor's forward o-ring seals against the
forward seal disk when the motor closures are tightened. With the use of
the seal disk, the liner o-ring (54mm only) and phenolic or fiber
forward insulator are no longer required and will not be included with
new reload kits. An added benefit of using the seal disks is that motor
cleanup is substantially easier; the disk prevents soot from being
deposited on the forward end of the case.
The new 98mm aluminum forward seal disk will be available from A*****ech
and its authorized dealers at a price of $20.00 each suggested retail.
Three seal disk o-rings will be included with each disk for use with
older reloads. Updated assembly drawings and instructions for the
affected reloads will soon be available for download in PDF format from
the Resource Library on the A*****ech website at
http://www.a*****echrocketry.com.
A*****ech Consumer Aerospace is a division of RCS Rocket Motor
Components, Inc., Cedar City, UT.
--
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