Motor Adapters & Spacers

We stock adapters for 18mm motor mounts and up to 54mm. Browse this category, or narrow your selection by clicking one of the buttons below. PMR (positive motor retention) retainers are often used with larger friction-fit adapters.

Low Power Adapters
Adapters for 18mm to 24mm Mounts
Larger Adapters
Adapters for 29mm
and larger Mounts
Positive motor retention
PMR Retainers
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Engine Adapters Mini to Standard

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. Rockets weighing up to 2 ounces that would normally fly on A8-3 engines can be flown on A10-3T engines.
$5.00

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Engine Adapters Standard to D

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. Rockets weighing up to 4 ounces that would normally fly on C11 or D12 engines can be flown on B and C engines.
$5.00

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Engine Adapters 24 mm to 29 mm

Engine Adapters 24 mm to 29 mm

Adapts Estes 24 mm C11/D, Estes 24 mm E and Estes E30 series Composite engines to a 29 mm Estes casing size. 2 sets per package. Includes orange adapter tubes also. Note: the This is the adapter of the same size as Estes E16 and F15 Black Powder Motors. It will allow you to fit Estes D and E...
$5.00

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E to D Spacer. 2 Pack

E to D Spacer. 2 Pack

These spacers allows you to place 24mm D size motor or casing into E-size motor tube. Works for Estes D and large C motors as well as to fit RMS-24 motor into E motor mount
$1.10

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29mm to 24mm Motor Adapter and F Spacer

29mm to 24mm Motor Adapter and F Spacer

This adapter will fit 24 mm engine into 29mm G motor mount. Also included is the spacer to properly hold F motor in the G motor mount.
$2.40

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38mm to 29mm Motor Adapter. Fully Assembled

38mm to 29mm Motor Adapter. Fully Assembled

Fully Assembled friction fit 38mm to 29mm adapter with a built-in thrust ring to prevent the adapter from being pushed through during the thrust phase. Weight: 70g Length: 9 1/4"
$14.99

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54mm to 29mm Motor Adapter

54mm to 29mm Motor Adapter

Consists of coupler tube to fit inside 54mm MMT, 29mm MMT tube, centering rings to mount the 29mm tube inside the 54mm coupler tubing and plywood thrust ring. Weight: 120g Length: 12"
$18.49

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54mm to 38mm Motor Adapter

54mm to 38mm Motor Adapter

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 plywood thrust ring. Weight: 135g Length: 12"
$18.99

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