Presented are the results of engineering flight test of the UH-1C (UH-1B/540 rotor) helicopter equipped with the M-5 grenade launcher and the XM-158 or XM-159 airborne rocket launcher pods suspended from the X-156 multiarmament helicopter mount. Tests included 32 jettison flights for the XM-158 pods, 20 jettison flights for the XM-159 pods and 16 firings of the XM-159 pods. The objective was to determine quantitative effect of the XM-159 pods installed from the XM-156 mount on the stability, control and performance of the helicopter; to determine the XM-158 and XM-159 jettison characteristics and define the flight envelope for safe jettison of the pods; and to determine the flight envelope for firing the XM-159 pods. There were no significant adverse changes in the stability and control characteristics of the UH-1B/540 due to the installation of the XM-159. Previously reported longitudinal dynamic instability in climbs was also present throughout the tests. Self-excited undamped lateral 2/3-per-rev vibration was prevalent during the tests. Insufficient rocket-to-aircraft clearance for firing the XM-159 on the XM-156 mount was present without the addition of 4-inch cast aluminum spacers between the XM-156 mount and the universal pylon. The XM-159 was adjusted to maximum elevation to provide sufficient clearance for firing with the spacers installed. No major stability and control problems were encountered during the firing tests of the XM-159 or during the jettison tests of both the XM-158 and XM-159. Recommended flight envelopes were developed for jettison of both systems. (Author)
Engineering Flight Test of the UH-1C Helicopter Equipped with the M-5 Grenade Launcher and the XM-158 or XM-159 Airborne Rocket Launcher Pods Suspended from the XM-156 Multiarmament Mount
1967
95 pages
Report
Keine Angabe
Englisch
Aircraft , Rockets , Ammunition, Explosives, & Pyrotechnics , Helicopters , Weapons , Flight testing , Rocket launchers , External stores , Performance(Engineering) , Firing tests(Ordnance) , Jettisonable equipment , Ejection , Aviation safety , Aerodynamic characteristics , Handling , Climbing , Grenade launchers , H-1 aircraft , M-158 rocket launchers , M-159 rocket launchers , M-5 grenade launchers(40-mm) , Uh-1c aircraft
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