Aerotech 75mm DMS Parts list manual

Storage and Handling
Store AeroTech rocket motors in a dry place where the temperature will remain
between 450F and 1000F. Do not cut, saw, attempt to alter the size, attempt to
disassemble, attempt to modify, or drop an AeroTech rocket motor. Do not use an
AeroTech rocket motor that you believe has been damaged in any way. Do not ignite an
AeroTech rocket motor indoors. Do not breathe fumes from the rocket motor exhaust.
First Aid
For a minor burn, apply a burn ointment. For a severe burn, immerse the burned area in
ice water at once and see a physician as quickly as possible. In the unlikely event of
oral ingestion of the propellant, induce vomiting and see a physician as quickly as
possible. The composite propellant used in AeroTech rocket motors consists primarily
of Ammonium Perchlorate and a rubber-like plastic elastomer. Redline™ propellant
also contains Strontium Nitrate.
Disposal
Pack motor firmly in hole in ground so that only the nozzle is exposed, in a remote area
away from people, animals, buildings and flammable materials. Ignite motor electrically
from a distance of 50 feet or more. Propellant and smoke charge will burn until
consumed. Wait 5 minutes and then dispose of the motor casing in inert trash.
Fire Safety
AeroTech composite rocket motors will normally not ignite unless subjected to direct
flame. Use water to fight any fires in which AeroTech rocket motors may become
involved: Direct the water at the AeroTech rocket motors to keep them below their 550
deg. F autoignition temperature. Foam and carbon dioxide fire extinguishers will NOT
extinguish burning propellants of the type used in AeroTech rocket motors. Keep rocket
motors away from flames, sources of heat and flammable materials.
Disclaimer and Warranty
NOTICE: As we cannot control the storage and use of our products, once sold we
cannot assume any responsibility for product storage, transportation or usage. RCS
shall not be held responsible for any personal injury or property damage resulting from
the handling, storage or use of our product. The buyer assumes all risks and liabilities
therefrom and accepts and uses AeroTech/RCS products on these conditions. No
warranty either expressed or implied is made regarding AeroTech/RCS products,
except for replacement or repair, at RCS's option, of those products that are proven to
be defective in manufacture within one year from the date of original purchase. In no
case will AeroTech warranty a product more than five (5) years after the date of
manufacture. For repair or replacement under this warranty, please contact RCS. Proof
of purchase will be required. Note: Your state may provide additional rights not covered
by this warranty.
AeroTech Division Made in U.S.A.
RCS Rocket Motor Components, Inc. P/N 21049-1 Rev. 1/26/17
Cedar City, UT 84721 Certified by the Tripoli Rocketry Association
www.aerotech-rocketry.com ©2014-2017 RCS Rocket Motor Components, Inc., All rights reserved
75 & 98mm DMS™
Disposable Motor System™
Single-Use Rocket Motor
Assembly & Operation Instructions
DO NOT OPEN ROCKET MOTOR PACKAGING UNTIL READY TO USE
Note: Motor designation and complete performance specifications (including a
sample time-thrust curve) are printed on the DMS motor label and packaging.
WARNING-FLAMMABLE: Read Instructions Before Use. Use only in
accordance with instructions. Do not smoke near rocket motors and
keep away from open flames and other heat sources. Sale to persons
under 18 years of age prohibited by federal law. ‘H’ and higher power
motors for use only by certified flyers. Ignite by electrical means only.
CAUTION: Keep out of reach of children. Motor is hot after firing.
Before You Begin:
• Do not modify the motor in any way.
• If any parts are missing or damaged, please call AeroTech at 435-865-7100.
Package contents: Other items needed:
1. DMS motor case & liner assembly 1. Flat blade screwdriver
2. DMS propellant grains 2. Epoxy stir stick
3. Forward smoke bulkhead with pre-installed O-ring 3. Hobby knife or scissors
4. O-ring and igniter kit
1. General Motor Assembly
1.1 Insert the propellant grains into the case and liner assembly, placing a (thinner)
grain spacer O-ring between each grain. If supplied, also follow grain bonding
instructions.

1.2 Insert the larger end of the smoke bulkhead with
the pre-greased O-ring into the open end of the
liner. Use a twisting motion to ensure the bulkhead
flange is seated completely against the liner.
1.3 Raise the motor assembly into a vertical
position and ensure that the bulkhead and liner
assembly is fully seated in the case and against the
nozzle. The larger diameter of the bulkhead should
now be flush with the end of the case. Place the
(thicker) forward O-ring into the space between the
smoke bulkhead and the case. CAUTION: Do not
apply any grease to the forward O-ring and do not
allow any oil or grease to contact the interior
abraded end of the case.
1.4 Using a stir stick or a flat blade screwdriver,
push the forward O-ring completely into the groove
between the smoke bulkhead and the case.
CAUTION: Do not allow any oil or grease to
contact the interior abraded end of the case.
2. Mixing and Applying the Forward Bulkhead Epoxy
2.1 Remove the screw-on caps of the supplied
epoxy bottles and dispense the contents of the
smaller hardener bottle into the larger resin bottle.
Allow the hardener bottle to drain into the resin
bottle for 30 seconds.
2.2 Using a stir stick, thoroughly mix the resin and
hardener combined in the larger bottle.
2.3 Replace the screw-on cap of the larger bottle
and dispense enough of the mixed epoxy into the
space between the smoke bulkhead and the case
to fill it completely. Secure the completed motor
assembly to a stable, solid object (such as a table
leg) in a vertical position and allow it to cure for at
least 16-24 hours prior to use.
3. Igniter Installation and Preparation for Flight
CAUTION:Install the igniter in the motor only when the rocket is at the pad and ready
for launch.
3.1 Remove the supplied FirstFire™ igniter from the cardboard tube and straighten the
leads.
3.2. Strip ½”-1” of insulation from the ends of the leads.
3.3 Insert the black-coated end of the igniter into
the nozzle opening and push it completely into the
motor core, until the coated end is touching the
smoke element in the motor bulkhead.
3.4 Using a hobby knife or scissors, cut a corner off
the end of the nozzle cap (if supplied) to produce a
vent hole in the cap about 1/8”-1/4” wide.
3.5 Press the open end of the nozzle cap over the
exposed nozzle extension to hold the igniter firmly in place.
3.6 Install the motor into the rocket's motor mount tube. Ensure that the motor is
securely retained in the rocket by using positive mechanical means to prevent it from
moving under thrust or during recovery system deployment.
3.7 Prepare the rocket's recovery system and then launch the rocket in accordance with
the National Association of Rocketry (NAR) and/or Tripoli Rocketry Association (TRA)
safety codes. Note: After use, the rocket motor casing may be disposed in inert trash.