High Power Model Rocketry

HAMR Adapter System for PRO Motor Retainers

HAMR Adapter System for PRO Motor Retainers - Main image
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$15.72 $24.56 In stock

The HAMR adapter system allows your rockets to be versatile! For use with our LOC and PML PRO motor retainers, you can affordably adapt down to a smaller motor size on the fly.

Have one of our retainers on your rocket and wish you could adapt down? We got you! These have been engineered to work in all LOC and PML retainers, past and present. 

HAMR adapters for 98mm and 75mm PRO retainers coming soon!

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When it ships

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Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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Delivery costs

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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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Returning an item

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (5.0 / 5 · 5 reviews)

Grace J. ★★★★★

Swapping down to a smaller motor used to mean buying a whole new retainer, so this thing paid for itself the first launch. It locks in tight against the retainer with no wobble, and the fit is clean enough that I stopped worrying about it mid-flight.

Owen ★★★★★

The adapter slid right into my PRO retainer and let me fly a smaller motor without buying a whole new housing. Fit was snug with zero wobble, and swapping it at the field took maybe a minute.

Timothy ★★★★★

Swapping down to a smaller motor used to mean pulling the whole retainer apart, but this adapter just threads right in. Took maybe a minute at the pad and saved me from hauling extra hardware to the launch.