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Intelligent Repeatable Release Hold Back Bar (IRRHB)

Award Information

Department of Defense
Award ID:
Program Year/Program:
2008 / SBIR
Agency Tracking Number:
Solicitation Year:
Solicitation Topic Code:
Solicitation Number:
Small Business Information
Michigan Aerospace Corporation
MI Ann Arbor, MI 48108-2285
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Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
Phase 1
Fiscal Year: 2008
Title: Intelligent Repeatable Release Hold Back Bar (IRRHB)
Agency / Branch: DOD / NAVY
Contract: N68335-08-C-0221
Award Amount: $79,616.00


The Repeatable Release Holdback Bar (RRHB) is a device that is used to hold aircraft in place just prior to launching them with a catapult. These bars are about 3 feet in length and attach to the front landing gear and hold it to a cleat on the flight deck. Once the catapult is fired a pre-determined force is reached and the holdback bar lets go of the aircraft allowing it to be accelerated down the deck. There have been some problems in the past with these holdback bars letting-go of aircraft prematurely, caused by worn parts or a failure of the bar to be properly reset after a previous launch. The result is that the aircraft moves down the deck unexpectedly and too slowly for a successful launch. Michigan Aerospace Corporation (MAC) proposes a way to record the number of shots fired on the bar, read the force acting on it during each launch and monitor reset conditions. In doing so, money can be saved in preventative maintenance by detecting early signs of a failure. During use, the holdback bar goes through high shock loads, which MAC is well-equipped to address in the design of this new system.

Principal Investigator:

Jon Coffer
Research Engineer

Business Contact:

Pete Tchoryk
Chief Executive Officer
Small Business Information at Submission:

1777 Highland Drive Suite B Ann Arbor, MI 48108

EIN/Tax ID: 383323642
Number of Employees:
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No