HAMR Motor Retainers require no tools and are very quick easy to use.

 



HAMR Motor Retainers

PML has developed our own line of high quality, threaded motor retainers! The HAMR (Highly Adaptive Motor Retainers) system has been designed specifically for use with our rocket kits or any scratch-built rocket using PML motor tubes. These lightweight, tool-free, threaded retainers are precision CNC turned from 6061 aluminum and anodized. The photo on the right shows the basic retainers for 29mm, 38mm, and 54mm motors. These retainers fit virtually all popular motor brands and types including Aerotech RMS (TM), CTI Pro XX (TM), Animal Motor Works (TM), Hypertech (TM), Kosdon (TM), Sky Ripper (TM), Loki (TM), and others.

The HAMR system can be adapted to existing rockets if the motor tube extends at least 3/8” beyond the aft centering ring. The HAMR can also be used with boattail and tailcone rockets.

Click here for the complete instruction sheet including retro-fit notes and ideas. (720k)

HAMR-KS for Kwik-Switch Motor Retainers

We weren’t about to leave our Kwik-Switch users high and dry so we also developed a system just for you! The HAMR-KS (Highly Adaptable Motor Retainers, Kwik-Switch version) system has been designed specifically for use with our rocket kits or any scratch-built rocket using PML Kwik-Switch motor tubes.

The basic HAMR-54 retainer is mounted to the Mother Tube for use with 54mm motors. Two adapter plates are supplied for flying with 38mm or 29mm motors. Changing from one motor size to another takes just seconds with no tools required!

See our Motor Mounts Page for more information about our Kwik-Switch motor mount system.

These lightweight, tool-free, threaded retainers and adapters are precision CNC turned from 6061 aluminum and anodized. The photo on the right shows the basic 54mm retainer and adapter plates for 38mm and 29mm motors. These retainers fit virtually all popular motor brands and types including Aerotech RMS (TM), CTI Pro XX (TM), Animal Motor Works (TM), Hypertech (TM), Kosdon (TM), Sky Ripper (TM), Loki (TM), and others.

The HAMR system can be adapted to existing rockets if the motor tube extends at least 3/8” beyond the aft centering ring.
The HAMR can also be used with boattail and tailcone rockets.

Following are the outer diameters of the HAMR threaded retainer rings. Regular and KS retainer rings are identical in size.
- 29mm 1.52" OD
- 38mm 1.93" OD
- 54mm 2.59" OD

Click here for photographic examples of using the HAMR-KS adapters with the Kwik-Switch.

Click here for the complete instruction sheet including retro-fit notes and ideas. (720k)

NEW! HAMR Adapters 54/38, 54/29, 38/29

Adapters for HAMR Retainers! If you`re using a HAMR retainer on your rocket and want to fly a smaller diameter motor, here`s your solution! The HAMR Adapters are specifically designed to work with our HAMR system, and are available in 54/38, 54/29 and 38/29 versions.

 

Click here for the instructional photos showing how the HAMR motor mount adapters are used.

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****** NOTE: PMR Motor Retainers have been discontinued ******

Part#DescriptionCostQty.

HAMR-KS-SET
Kwik-Switch HAMR Retainer Set
Designed to incorporate into the PML "Kwik-Switch" motor mount system. Complete set with all you need for the 54mm main/mother tube, 38mm KS adapter and 29mm KS adapter. 2.0 ounces total.
$44.95
HAMR-KS38-ADPTR
38mm Adapter disk for HAMR-KS System
Replacement disk only for the HAMR-KS system. For use with 38mm motors installed in Kwik-Switch 38mm adapter. 0.30 ounces.
$10.95
HAMR-KS29-ADPTR
29mm Adapter disk for HAMR-KS System
Replacement disk only for the HAMR-KS system. For use with 29mm motors installed in Kwik-Switch 29mm adapter. 0.40 ounces.
$10.95
HAMR-54-SET
54mm HAMR Retainer Set
Designed for rockets with a standalone 54mm MMT. Includes threaded sleeve and retainer cap. 1.30 ounces total.
$34.95
HAMR-38-SET
38mm HAMR Retainer Set
Designed for rockets with a standalone 38mm MMT. Includes threaded sleeve and retainer cap. 0.80 ounces total.
$31.95
HAMR-29-SET
29mm HAMR Retainer Set
Designed for rockets with a standalone 29mm MMT. Includes threaded sleeve and retainer cap. 0.65 ounces total.
$27.95 TEMPORARILY OUT OF STOCK
HAMR-54-SLV
HAMR-54 Replacement Sleeve
Threaded sleeve only for 54mm MMT. 0.65 ounces.
$18.95
HAMR-38-SLV
HAMR-38 Replacement Sleeve
Threaded sleeve only for 38mm MMT. 0.35 ounces.
$16.95
HAMR-29-SLV
HAMR-29 Replacement Sleeve
Threaded sleeve only for 29mm MMT. 0.30 ounces.
$14.95 TEMPORARILY OUT OF STOCK
HAMR-54-CAP
HAMR-54 Replacement Cap
Threaded cap only for 54mm MMT. 0.65 ounces.
$17.95
HAMR-38-CAP
HAMR-38 Replacement Cap
Threaded cap only for 38mm MMT. 0.45 ounces.
$15.95
HAMR-29-CAP
HAMR-29 Replacement Cap
Threaded cap only for 29mm MMT. 0.35 ounces.

$13.95
HAMR-54/38-ADPTR
54mm to 38mm Motor Adapter for HAMR-54
Adapter to fly 38mm motors in kits with a 54mm MMT and HAMR-54 retainer installed. 1.10 oz total.
$21.95
HAMR-54/29-ADPTR
54mm to 29mm Motor Adapter for HAMR-54
Adapter to fly 29mm motors in kits with a 54mm MMT and HAMR-54 retainer installed. 1.10 oz total.
$21.95
HAMR-38/29-ADPTR
38mm to 29mm Motor Adapter for HAMR-38
Adapter to fly 29mm motors in kits with a 38mm MMT and HAMR-38 retainer installed. 0.55 oz total.
$19.95

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