Lockheed Model 186 / CL-575 / XH-51
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Ree Timmer, e-mail, 22.02.2015 22:03

It was a modification of his design. Some don't want to give him credit for the design. But the patent (which can be accessed at the U.S. Patent office clearly indicates that his patent was filed in 1960 on the Model 186 (XH-151). The XH-151A which was a modification of Paul E. Williams' original design.


Rick Koehnen, e-mail, 29.10.2012 19:39

P.s. the ropes wrapped around the horizontal stabilizer of the XH-51B tore through the skin and ribs and only stopped against the spars.


Rick Koehnen, e-mail, 29.10.2012 19:36

Both the XH-51A and XH-51B survived and I last saw them (15 years ago) in the US Army Aviation Museum at Ft Rucker, Alabama. Same place the base commander buldozed the Boeing HLH ten years ago. At the time they were both in an old WWII wooden hanger which I hear no longer stands. I don't know the status of the aircraft inside which included another AH-56, numerous prototype helicopters and vtol platforms. Unfortunately for lack of funds and help the staff had to utilize 'woc candidates' from the Warrant Officer School to move things around. Ropes were put around the horizontal stabilizers of the XH-51B and it was towed on its skids into the hanger until the tip of the right wing broke and protruded into the nose and cockpit of the McDonnell XV-1. Its a shame they don't have the funds and manpower to restore and maintain their collection as its probably the best collection of original prototype helicopter and vtol platforms in the world. What would help is since 9/11 access is restricted as the museum is on the military base and the general public can no longer just drive up and visit.


Don Hillberg, e-mail, 30.03.2012 04:07

Have lots of data still need more. new # 805-832-4248
I have lots of time on my hands. Back injury.


Paul Law, e-mail, 20.01.2012 06:36

The AH-56 was awesome and had extremely advanced capabilities. I had the privilege of being a structures engineer on that project (fresh out of College). Its cancellation by the Army and down fall was related to at least two major issues. One is it had a number of vibration harmonic problems associated with the fuselage and I think secondly and maybe more importantly the Army's resistance to allow fly by wire control system which was leading edge technology at the time. One flight test article was lost and the pilot killed due to control system harmonics when the main rotor deflected sufficiently to strike the canopy. The other flight test / qualification article was then subsequently modified to accommodate a early F-104 downward ejection set so that the pilot did not have to pass synchronized thru the rotor system if he decided to eject. Much of the subsequent flight test focus then was redesign of the flight control system and applying vibration absorbers band aides to combat the fuselage vibration harmonic problems (which many helicopter designs had issues with as well). Anyway, that my recollection.


Don Hillberg, e-mail, 07.01.2011 02:25

Looking for Data, old prints ,drawings,reports on this Helicopter,anything will help-call 805-658-8245 thank you.P.S. its for a special project...


Jim Maloy, e-mail, 20.10.2010 20:39

In the 1960's I was in the California National Guard, 140th Aviation Battalion, operating out of the Oxnard, CA airport. (This was the home base for testing the Lockheed Model 186). So, I witnessed some of it's first test flights. One day while I was at an Oxnard beach a Model 186 came out to do some test flights. I watched it do several mock strafing runs on a structure near by. I don't remember how many loops it did, one after another, but I was sure impressed. After it finished the strafing runs it climbed up a few thousand feet and made a run from south to north and performed some rolls. This was by far the best air show I have ever seen. At the time it was the only helicopter that could perform these maneuvers.

A few years later, while I was still in the 140th but stationed in Long Beach, CA, I was invited to watch a film that was taken that day on the beach. The camera was mounted behind the pilot and copilot and pointed out the front widow. I watched the whole flight over again, only from inside the Model 186 this time. The camera was focused on one of the hills north of Ventura and when the craft did it's roll, I could detect no yaw or pitch whatsoever in the craft. The camera stayed focused on one spot on the hill. A perfect roll! The other men watching the film were mostly single engine fixed wing and small helicopter pilots. The Model 186 was more suited for fixed wing pilots than for helicopter pilots. The pilots were all very excited about the possibility of getting to fly one of these someday. This film is out there somewhere but I have no idea how to find it. Sorry!

All of the above mentioned pilots were activated soon after this and sent to Vietnam.

One of my uncles was a mechanic who worked on the Model 186 and it's predecessor the XH-51A-1. The following is one of his stories: one day while working on the engine, he needed a part from the parts room so he climbed down off the craft and went to get it. When he returned with new part, the craft was gone. He went back into the dispatch office to find out where it had been moved to. While waiting to talk to the dispatch person, he over heard a radio report from the craft. The pilot was reporting that he had just made an emergency landing on the beach at Point Mugu Naval Air Station. He reported he saw something fall off of his craft and wanted to know what it might be. My uncle spoke up and said he knew what it was. It was a make-shift stool he had built to sit on while working on the engine. My uncle then wanted to know who had released the craft for flight because he had the craft tagged out of service for maintenance.


Arthur Moss, e-mail, 09.10.2010 08:12

The two L-286's were lost in a hanger fire. I was the Quality Engineer on their build. The PT-6 was very expensive. The AH-56A Cheyene was Fantastic. It was better in 1969 than the Apache is today. A Commercial transport version was on the drawing boards.


Phil Salvatore, e-mail, 06.11.2009 20:47

I grew up in the 1960's in the San Fernando Valley. Back then the Valley soundtrack was Clay Lacy taking hot laps in his racing P-51 ( quite the treat for a kid outside for recess ), rocket tests at nearby Rocketdyne, and almost daily sonic booms.
Even as a kid I was aware of the Lockheed AH-56 and the 286. I knew it was special. One day at recess I vividly recall the Lockheed 286 pulling a loop right over our elementary school. It was a riveting sight, and it remains burned into my mind today. Later in life I flew tandem rotor Boeing Vertols and consider them to be the best operational helo design, period. But still, I wish I could have gotten my hands on something like a Cheyenne or 286.


Mike Gray, e-mail, 23.09.2008 06:50

I came across one of the 286s in central California around 1986, stored in the hanger of a local rancher/pilot. Tried to get the money together for a restoration to flying condition, hope someone with the financing finds it someday.


Art Bliss, e-mail, 04.04.2008 16:31

I was fortunate enough to get a one hour demo ride in the 286 in Aug 1967 with Lockheed test pilot Herman (Fish) Salmon. I do not understand why this machine didn't sell. It was superior to anything at the time and was ahead of some machines flying today.


Cathy Edwards, e-mail, 11.02.2008 00:00

Is this the same helicopter patented by Paul e Williams? Patent #3065933.




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