Sway Braces and BRUs

When a National Museum requests SWAY BRACES for their QH-50, chances are the Gyrodyne Foundation will have them in inventory. Unfortunately, what we have are units that were used on QH-50s that served at sea aboard naval destroyers and therefore suffer from extensive corrosion. What takes place is a complete disassembly of the braces, stripping of the paint to bare metal and restoration of most of the hardware. We try to restore as much as practical since some of the items are no longer made by industry, like the AN45 eyebolts used on the forward sway braces.

    During reassembly after a new coat of paint, we use the second variant of Gyrodyne's specifications in attaching all the Bomb Release Unit pins, with chains to the braces themselves. On early QH-50C's, this was not done; the pins were connected to the fuselage of the helicopter. As seen above-left, a complete set of braces after restoration.  Braces are a key component to an authentic installation of the MK-44 as seen at right, so the visiting public can understand the complexities of carrying a weapon, for deployment, safely.

   The MK-8 Mod 0, Bomb Release Unit or BRU as the ordnancemen refer to it, is the only approved BRU for use on the QH-50 DASH Weapon system for deployment of both the MK-44 Mod 0 and Mk-46 Mod 0 Torpedo. Because of the importance in knowing how this BRU works, we'll provide a quick lesson for those museums that find themselves unable to lock their BRUs to hold their MK-44 Torpedoes.  The Gyrodyne Helicopter Historical Foundation (GHHF) has brand new BRUs in stock, so if yours is not working, please contact us immediately as taking a MK-8 a part to fix it can be very dangerous; they are lots of spring loaded parts in one!

    Per the photo at left, the MK-8 BRU has had the Aero Arming solenoid (seen above) removed for ease of reference. Note the word "FRONT" on the BRU that is underlined. The BRU must face front or the forward direction of the aircraft per the RED ARROW or the wiring harness will not connect to the release solenoid.

    Now,  Item A is the release lever. Item "B" is the latch actuator. To lock the BRU, move lever "A" in the direction of the red arrow to its stop and HOLD IT THERE. Now, while still holding lever "A" forward, move the latch actuator "B" backwards to its stop and allow lever "A" to move backwards. This locks the latch actuator. IF this does not Lock the latches, then your BRU is damaged and needs repair by the GHHF shop. IF your BRU does lock, quickly install either a AN4-6A or equivalent 1/4" O.D. Bolt at Position "C" and secure with a locknut on the end of the bolt to keep the BRU from accidentally releasing.

Many thanks to members of The Association of Aviation Ordnancemen who have assisted the Gyrodyne Foundation on numerous projects concerning the Airborne Armament System of the QH-50 Aircraft.



Home Up MK-44 Magazine Sway Braces and BRUs MK-64 Suspension Bands


Helicopter Historical Foundation
P.O. Box 3838, Reno, Nevada USA 89505

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All Photographs, technical specifications, and content are herein copyrighted and owned exclusively by Gyrodyne Helicopter Historical Foundation, unless otherwise stated.  All Rights Reserved 2013.

The Gyrodyne Helicopter Historical Foundation (GHHF) is a private foundation incorporated in the State of Nevada as a Non-profit organization. 

GHHF is dedicated to the advancement of the education and preservation of the history of the Ships, the Men and the Company that built, operated and flew the U.S. Navy's QH-50 Drone Anti-Submarine Helicopter (DASH) System and to the preservation of the history of the U.S. Army's past use of DASH.
Your support will allow for that work to continue.