Here is an array of motor mount sizes including interchangable designs that allow the use of several motor diameters in the same rocket.


PML produces a unique interchangable motor mount adapter called the Kwik-Switch 2000 that uses a threaded coupler that is very durable and reliable. Motors can be friction fit into the adapter, prepped, then screwed in the rocket. The KS2000 system uses our 54, 38, and 29mm phenolic airframe tubing, and custom-cast urethane parts for the screw-together parts.

Click here for the Kwik-Switch 2000 assembly instructions in PDF format.

   
The Kwik-Switch 2000, whether as a stand-alone part for scratchbuilds or used in kits, comes with the 54mm main motor tube, and 38mm and 29mm adapters included.

The standard Kwik-Switch system fits all 29mm reload casings, the 38mm 240, 380, 480, 600, and 720 casings, and the 54mm 852 and 1280 casings. The Extended Kwik-Switch will fit all the above and adds the 54mm 1706 casing. The J570 casing is not recommended for the Extended Kwik-Switch.

See our FAQ (link below) for more information about use of a J570 casing with Kwik-Switch systems. (Requires ADPTR-54/38HD below; Extended KS not recommended).

 

See our Motor Retainer Page for our H.A.M.R. (Highly Adaptable Motor Retainer) to go with your motor mount.

There are HAMR Motor Mount Adapters available for 54/38, 54/29 and 38/29 that are specifically designed for the HAMR system!

 

PML also produces friction fit adapters with a built-in thrust ring to prevent the adapter from being pushed through during the thrust phase.

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Part#DescriptionCostQty.

KS-KIT-2K
Kwik Switch 2000 Motor Mounts:

The Kwik Switch. The first and only interchangeable motor mount system in the industry just got better! Once the 54mm mother tube is installed in your rocket, you can change up to 38mm or 29mm by just screwing in the adapters. Approximately 13.5" usable length. Assembles in just minutes. (This system must be incorporated during initial assembly.)

The complete Kwik Switch 2000 kit includes:
  • 1) 2.1" x 14.5" Mother tube (54mm)
  • 1) 1.5" x 14.5" Adapter tube (38mm)
  • 1) 1.1" x 14.5" Adapter tube (29mm)
  • All necessary rings & locking components
``
$29.99
KS-2.1-2K
Additional 54mm Mother Tube; includes threaded plastic portion.3.4 oz.

$13.99
KS-1.5-2K
Additional 38mm Adapter; includes threaded plastic portion and centering ring.2.3 oz.

$12.99
KS-1.1-2K
Additional 29mm Adapter; includes threaded plastic portion and centering ring.2.2 oz.

$12.79
KS-KIT-2K EXT
Extended KwikSwitch 2000 Motor Mounts
Just like the standard Kwik Switch 2000 described above, except the tubes are 17" long (will accept the longer 54/1706 casing). Approximately 17.5" usable length. (Extended KS not recommended for J570; use ADPTR-54/38HD for J570). The complete Extended Kwik Switch 2000 kit includes:

  • 1) 2.1" x 17.9" Mother Tube (54mm)
  • 1) 1.5" x 17.9" Adapter Tube (38mm)
  • 1) 1.1" x 17.9" Adapter tube (29mm)
  • All necessary rings & locking components
`
$33.99
KS-2.1-EXT-4
Additional extended 54mm Mother Tube 5.0 oz

$14.49
KS-1.5-EXT-4
Additional extended 38mm Adapter 3.5 oz

$13.49
KS-1.1-EXT-4
Additional extended 29mm Adapter 2.7 oz

$12.99
KS-98/75/54-KIT
98/75/54 Kwik-Switch Motor Mounts:

With the advent of 98mm motors, many people are building large rockets with 98mm motor mount tubes. Some of these rockets can be successfully flown with 75mm and 54mm motors as well. We have developed a giant, heavy-duty version of our original locking-tab style Kwik-Switch motor mount to allow you to easily and safely change from one motor size to another in a matter of seconds. This mount is available with 98/75/54mm adapters, or with just 98/54mm adapters. Each adapter is also available individually, as is the 98mm Mother Tube system (so you can build it into your rocket and add adapters later).

The 98mm Kwik Switch kit includes:
  • 1) 36" long 98mm tube (PT-3.9)
  • 1) 36" long 75mm tube (PT-3.0)
  • 1) 36" long 54mm tube (PT-2.1)
  • All necessary locking & centering rings
  • All necessary locking tabs (already installed in 98mm Mother Tube)
  • 42.2 oz.

$92.99
KS-98/75-KIT
Complete system less 54mm Adapter.28.4 oz.
$68.99
KS-98/54-KIT
Complete system less 75mm Adapter.28.4 oz.
$59.99
KS-98-MOT TUB
98mm Mother Tube system only16.8 oz.
$30.99
KS-98/75-ADPT
75mm Adapter Only13.8 oz.
$38.99
KS-98/54-ADPT
54mm Adapter Only11.8 oz.
$28.99
KS-75/54-KIT
75/54 Kwik-Switch Motor Mounts:

Similar to our Giant KS 98mm system above, we also offer a 75/54mm original locking-tab style Kwik-Switch motor mount for the popular 75mm motors. This mount comes with the 75mm mother tube and 54mm adapter. The 75/54mm adapter is available individually, as is the 75mm Mother Tube system (so you can build it into your rocket and buy the 54mm adapter later).

The 75mm Kwik Switch kit includes:
  • 1) 36" long 75mm tube (PT-3.0)
  • 1) 36" long 54mm tube (PT-2.1)
  • All necessary locking & centering rings
  • All necessary locking tabs (already installed in 75mm Mother Tube)
  • 22.4 oz.
$53.99
KS-75-MOT TUB
75mm Mother Tube system only. 36" long.12.3 oz.
$28.99
KS-75/54-ADPT
75/54mm Adapter Only for KS75/54 system. 36" long.10.1 oz.
$27.99
MMT-1.1-18
1.145" ID Phenolic Airframe Tubing.062 Wall18" Length2.3 oz.
$6.99
MMT-1.5-18
1.525" ID Phenolic Airframe Tubing.062 Wall18" Length3.1 oz.
$7.49
MMT-2.1-18
2.152" ID Phenolic Airframe Tubing.062 Wall18" Length4.4 oz.
$8.99
ADPTR-38/29
Standard Friction Fit MMT Adapter (ADPTR-38/29):
38mm to 29mm (comes fully assembled)
8" length

$14.99
ADPTR-54/38
Standard Friction Fit MMT Adapter (ADPTR-54/38):
54mm to 38mm
Consists of coupler tube to fit inside 54mm MMT, 38mm MMT tube, and centering rings to mount the 38mm tube inside the 54mm coupler tubing.
9" length

$18.99
ADPTR-54/38HD
Standard Friction Fit MMT Adapter HEAVY DUTY (ADPTR-54/38HD):
54mm to 38mm heavy duty MMT adapter intended for use with J570 and similar high-thrust 38mm motors in 54mm Kwik-Switch rockets. Consists of coupler tube to fit inside 54mm MMT, 38mm MMT tube, centering rings to mount the 38mm tube inside the 54mm coupler tubing, and thrust rings for the bottom of the adapter. Click here for simple PDF drawing.
14" length

$20.99
ADPTR-54/29
Standard Friction Fit MMT Adapter (ADPTR-54/29):
54mm to 29mm
Consists of coupler tube to fit inside 54mm MMT, 29mm MMT tube, and centering rings to mount the 29mm tube inside the 54mm coupler tubing.
9" length

$18.49
ADPTR-75/38
Standard Friction Fit MMT Adapter (ADPTR-75/38):
75mm to 38mm
Consists of coupler tube to fit inside 75mm MMT, 38mm MMT tube, and centering rings to mount the 38mm tube inside the 75mm coupler tubing. Also includes special ring for bottom of mount for positive retention to rocket.
36" length

$29.99
ADPTR-75/54
Standard Friction Fit MMT Adapter (ADPTR-75/54):
75mm to 54mm
Consists of coupler tube to fit inside 75mm MMT, 54mm MMT tube, and centering rings to mount the 54mm tube inside the 75mm coupler tubing. Also includes special ring for bottom of mount for positive retention to rocket.
36" length

$30.99
ADPTR-98/75
Standard Friction Fit MMT Adapter (ADPTR-98/75):
98mm to 75mm
Consists of coupler tube to fit inside 98mm MMT, 75mm MMT tube, and centering rings to mount the 75mm tube inside the 98mm coupler tubing. Also includes special ring for bottom of mount for positive retention to rocket.
36" length

$41.99

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