Semroc Motor Mounts
Welcome to Uncle Mikes Rocket Shack Paypal, Money Orders, Checks (10 Business days to clear) Our personal site and launch pictures Great rocketry resource links on this page Photos of some of the built kits we sold to our Customers T-shirts,coffee mugs, Our Ebay store & Yahoo auctions In case you have any questions
SLS Laser-X Motor Mounts
Dual Engine Mount is designed to convert the SLS
Laser-X into a dual 24 mm (Estes D and E) engine
powered rocket. Simply assemble, insert into SLS
Laser-X, and twist into place. Kit contains two
engine mount tubes for .950" (24mm) x 3.75" (95
mm) engine, two centering rings for Series #225
body tubes, thrust rings, engine hooks, and engine
spacers with full instructions.
Buy It Now 8.45

Quad Engine Mount is designed to convert the SLS
Laser-X into a quad 18 mm standard engine powered
rocket. Simply assemble, insert into SLS Laser-X,
and twist into place. Kit contains four engine mount
tubes for .690" (18mm) x 2.75" (70 mm) engines,
two centering rings for Series #225 body tubes,
thrust rings, adapter tube, coolant fins, and engine
hooks with full instructions.
Buy It Now 12.50

Motor Hooks
A motor hook is used to positively retain the model rocket motor in the body tube or
motor mount tube, but allow for the easy removal of the casing at the end of the flight.

Mini "13mm"
13mm Motor Hook 1.75"
.55 Each

Large "E"
24mm Motor Hook  3.75"
.75 Each

Standard "A,B,C &D"
18/24mm Motor Hook  2.75"
.65 Each

Standard "A,B,C &D"
18/24mm Motor Hook  2.75"
Pack Of 10
Buy It Now
6.00

For increased value we now offer a 10 pack
of our standard 18/24mm 2.75" motor hooks.
Motor Block And Thrust Rings
Other Engine Mount Accessories
Motor Mount Tubes
Centering Rings
BT50 to BT55
Package Of 10
Retail Price 3.00 Buy It Now
2.50

Motor Block/Thrust Ring
Used for preventing your motors from being inserted too far
forward in the motor tube. Perfect fit into a body tube. These make
great replacements for rebuilds, and are perfect for using in motor
mounts of scratch built kits. Manufactured in the U.S.A these are
the same high quality parts they use in commercial rocket kits.
They come packaged in multiples of 10 (29mm pack of 5) . So pick
up a few to throw in the parts box.

BT5, BT20 Or BT50
Retail Price 3.00 Buy It Now
2.50

Motor Block/Thrust Ring BT5
Package Of 10

Motor Block/Thrust Ring BT20
Package Of 10

Motor Block/Thrust Ring BT50
Package Of 10

5 Pack 29mm Engine Blocks
Pack of 5 for 29mm engines tubes

Retail Price 2.50 Buy It Now 2.00
Motor Block 29mm Tube
Package Of 5

Clip Whips
2 Motor Clip Whip
2 Engine Clip Whip
Retail Price 15.49
Buy It Now
14.71

IMPORTANT: Anytime you are designing a cluster model or converting a model from single
motor to cluster motor use you need to verify the stability of your model before flight.
Adding more motors to the model increases the weight in the rear of the model moving the
Center of Gravity (CG) further back and may cause instability in your model. If you are
converting a known stable model, the easiest method to assure stability is to fully load the
unmodified model for flight (motor installed, recovery device, etc) and balance this model on
your finger. This balance point is the CG of your model and you should mark this. Then
install the cluster engine mount and prep your model for flight again. You will note that the
CG has moved towards the back of the model. Add nose weight to the nose cone until you
have moved the CG back to its original point. If you are designing your own model you
should make yourself aware of model rocket stability and the relationships between the
Center of Gravity and the Center of Pressure and how to measure both.
Empty Motor Casing 18mm
Package Of 6
Buy It Now
1.00

Empty Engine Casings
Use this to add 2 stage capability to the Centurion, Vega, Goliath, etc.
It is an old design that uses the OOP
A10-0T to add 2 stage capability to the
Centurion, Vega, Goliath, etc. Since
Estes announced the revival of the
A10-0T booster engine. Stages at about
30 feet and adds about 100 feet to the
altitude.
Add On Engine Mount Booster-16
For Mini 13mm Motors.

Buy It Now 5.00

24mm
2.75" Long (D)
Retail Price
.40

24mm
3.75" Long (E)
Retail Price
.40

18mm
2.75" Long
Retail Price
.40

13mm
1.75" Long
Retail Price
.40

Single Pack
Motor Mount Tubes
are manufactured
to be exact replacements.
Fits Standard Body Tubes
Very High Quality Material.
5 Pack
13mm
1.75" Long
Retail Price
1.50

18mm
2.75" Long
Retail Price
1.50

24mm
2.75" Long (D)
Retail Price
1.50

24mm
3.75" Long (E)
Retail Price
1.50

10 Pack
13mm
1.75" Long
Retail Price
2.50

18mm
2.75" Long
Retail Price
2.50

24mm
2.75" Long (D)
Retail Price
2.50

24mm
3.75" Long (E)
Retail Price
2.50

Booster 8 For Excalibur
Body Diameter .908" (2.3 cm)
Length 3.0" (7.6 cm)
Fin Span 5.3" (13.5 cm)
Net Weight 1.2 oz (34.1 g)
Fins Laser-Cut Fiber
Recovery Tumble
Skill Level 1 - Easy
Stages Single
Shipping Weight 4 oz
If you like two-stage action, there is also the #8 Booster kit that Centuri
added to convert the Excalibur™ to an Excalibur 2™.
Buy It Now 4.00

Estes Engine Adapters
Engine Adapters Standard to D

Two simple steps transform a standard engine into a D size.
Insert a standard engine into the adapter, and insert the adapter
into a rocket. 3 adapters per pack. Reusable.

Adapts D engine mounts to hold a standard engine.

NOTE: This motor adapter has been tested in products that use
ESTES metal engine hooks. It may not work with other brands of
engine hooks.

Rockets weighing up to 4 ounces that would normally fly on C11
or D12 engines can be flown on B and C engines.

Buy It Now 6.00

Engine Adapters Mini to Standard

Two simple steps transform a mini engine into a standard size.
Insert a mini engine into the adapter, and insert the adapter into
a rocket. 3 adapters per pack. Reusable.

Adapts standard engine mounts to hold a mini engine.

NOTE: Rockets weighing up to 2 ounces that would normally fly
on A8-3 engines can be flown on A10-3T engines.

Buy It Now 6.00

Booster 18 For Maxi Micron
Body Diameter 1.84" (4.7 cm)
Length 4.6" (11.7 cm)
Fin Span 1.84" (4.7 cm)
Net Weight 0.3 oz (8.5 g)
Fins None
Nose Cone None
Recovery None
Decals None
Skill Level 1 - Easy
Stages Single
Shipping Weight 4 oz
The Booster-18 is used to convert the single stage Maxi-Micron to a two stage.
It uses standard 18mm booster engines. It will work with other ST-18 based
kits in the future.
Buy It Now 4.75