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PLEASE READ!
When ordering motors
please do not select premium shipping services. ALL motors will be shipped
ground, best way. Either USPS if possible or Fed Ex Ground. If they
must go Fed Ex there will be a $20.00 hazmat fee added to your order.
Thank You,
Ken
For a listing of rocket motors that can be shipped
via USPS, click here.
Ken continues as
our rocket expert and orders for rocket items can be placed with Ken during
the following hours:
Wed: 2-5:30, Thurs: 5-8, Fri: 2-5:30.
Due to recent changes in government regulations regarding the
purchase of high power rocket motors and rocket kits you must now make an
appointment with Ken.
You are not able to purchase these items when Ken is not in the store. It is
a very good idea for you to call before traveling to our store.
If it is more convenient Ken can be contacted by e-mail at:
rockets@alshobbyshop.com
Al's
Hobby Shop continues to provide rocketry expertise to our schools and
scouts and
attending as many launches and training seminars as we can. We offer
20% off all Estes products and no
sales tax (providing you can supply us with your school or scout tax exempt
form). Call us and allow us to supply your rocket launch.
Forward seal disks now
required for specific RMS reloads
News Release
by AeroTech Consumer Rocketry
Wednesday, May 21,
2008
 CEDAR
CITY, Utah USA — As a result of field experience and customer feedback,
AeroTech 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 shipping with 98mm reload kit production.
A small percentage of customers using some of these reload kits have
reported 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, AeroTech 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 circumferential
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 AeroTech 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 AeroTech website at
http://www.aerotechrocketry.com/ .
AeroTech
Consumer Aerospace is a division of RCS Rocket Motor Components, Inc., Cedar
City, UT.
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