Sikorsky S-70
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John, 29.07.2023 15:30

The cause of the crash was attributed to a mechanic opening a cover panel to the controls which actuated the tail horizontal stabilizer, then departing. Someone came along and secured the cover, seeing it open. The pilot took off not knowing the stabilator was inoperative. There was an ECP Engineering Change Proposal later to add an aural warning system that the stabilator controls were not hooked up. So I heard. I had just started working there and was in an office when it occurred. I asked years later what happened, and that's what I heard.

遠藤蘭丸, e-mail, 09.07.2023 05:46


Anonymous, 10.05.2023 03:02

I was the Captain on the Rescue Boat during that day

Mike s, e-mail, 09.01.2021 00:08

On May18,1978, s/n 73-21650 prototype UH-60 Unfortunately crashed into the Housatonic River. I was a crew member on a Coast Guard HH-52A Which was dispatched from Brooklyn Air Station for search and rescue and helping pick up the pieces. Does anyone have any more information on this? Newspaper clippings, etc.? Back then it was hush-hush.

Luis Raya, e-mail, 05.03.2020 17:12

78-23004 is now in CA. It is owned by a private company. I currently work on it making it Airworthy for the Civilian side of the house.

THOMAS TOTH, e-mail, 11.11.2016 16:14

Having an interest in the assembling of the black hawks in the Australia under license, would there be available a control or schematic wiring diagram covering the port (pilot) side toward the rear from the door apologize for mention rear twice.

Joe Petrea, e-mail, 08.09.2016 02:16

Looking for acft. 95-26661, it was damage in Iraq by a airforce follow me truck. The unit was C Co. 1/131 Avn. out of Salisbury N.C. It was my acft. from the factory to 2011. Just like to know where it ended up.

Lat Adkins, e-mail, 17.02.2015 20:07

Whoops, I thought 78-23004 came from Ft. Bragg. It came from Ft. Campbell.

Lat Adkins, e-mail, 17.02.2015 20:05

I was in the KY Guard from 1985-1989. We got 78-23004 from Ft. Bragg when KY became the first Guard Black Hawk unit. It was a complete pig when we got it in 1983? with less than 500hrs. on it. The Active Army couldn't get it to fly right, so when it got to KY, my dad, a maintenance test pilot for the unit, decided to fix the damn thing once and for all. The unit finally got it repaired and it was a wonderful aircraft after that, except for the dual accumulators (winterization kit installed). I was a crew chief in the unit and my aircraft was 78-22961, the 24th aircraft off the line, 16th production aircraft. Anyone know what happened to it when it left KY? Thanks.

Isabella Koch, e-mail, 25.10.2014 22:04

Do you have any information on the UH-60 Black Hawk? I ask this because i am doing a report on someone in history, and for me that would be my Mom. She flew the UH-60. so if you could, would you let me know any information that you might have. Thank you.

78-23004, e-mail, 03.12.2013 04:59

Saw Rich Brunner's comment. I flew 78-23004 (Balls) in the VT Guard from 1999 to 2008. Was our old reliable in OIF 5. Went to CA Guard in 08 and understand it's now in North Dakota Guard

Rich Brunner, e-mail, 07.10.2013 21:42

I was assigned to A Co. 5th Trans Bn. 101st Airborne Division. I worked on 78-23004. When I was assigned to the Illinois National Guard, we received 78-23006. 006 left us to go to CCAD for rebuild. My favorite aircraft was 77-22720. It spent many years in the Illinois National Guard.

kiran, e-mail, 09.02.2012 16:49

Need width of blade not length and diameter WIDTH of rotary blades. Aswell as sound output of the black hawk please anyone with information email me asap

Zaylor, e-mail, 20.10.2011 04:11

Hi. I am looking for the dimensions of a blackhawk frame. I am a student and I want to build a model from steel. I was wondering if there was anyway I could get those measurements?

Mark Moran, e-mail, 20.02.2011 07:25

There is a grat book out on the Blackhawk that talks about much of what Ron has mentioned below, it is calle "Blackhawk:The Story of a World Class Helicopter" by a guy named Ray Leoni who was the program manager during the development and the fly-off for the Army. Very informative and interesting, an easy read.

Jason Humbert, e-mail, 27.01.2011 20:11

Thank you Ron for the great info.

Michael Krebs, e-mail, 15.09.2010 22:48

What type of air cleaning system does the helicopter have?
Also, I've been told that the turboshaft engines are not used in the same manner. Are they hooked up differently?
What does "full military power" mean?

Ron Caron, e-mail, 15.08.2010 19:31

Responding to jason Humbert's question above:
I am now retired but was actively involved in the electrical design on both the YUH-60A UTTAS and later the UH-60A Black Hawk. Like most Sikorsky engineers at the time, I was keenly aware of the other attributes of the test aircraft. My knowledge of flight dynamics is minimal so please overlook any description details that are not well described.

The initial flight version of the YUH-60A (before the fly-off with Boeing's YUH-61A) did not have the rotor shaft extension, had a large fixed horizontal stabilizer and a large cross-section vertical stabilizer. The rotor was very close to the top of the main rotor fairing in order to meet an Army requirement that the aircraft be air transportable in a C-130 without disassembly. The vertical an horizontal tail surfaces were intended to provide very stable forward flight characteristics. Sikorsky's success in winning this competition, in my view, was largely the result of making improvements to overcome problems identified during early development flight testing.

A very substantial 4-per-rev vibration was experienced during initial flight testing and drag was limiting forward speed. After several attempts at overcoming thus with structural changes, the main source of the vibration problem was attributed to rotor blade compression of air causing pulses on the wide upper fuselage. Raising the rotor was the only practical alternative that worked and the adapter was viewed as the best compromise to maintain air transportability. A by product was the increased speed resulting from placing the large rotor head cross section well above the fairing where aerodynamic pressure was considerably lower.

The horizontal stabilizer was large for stability in forward flight but caused a severe nose-up problem during hover and especially during flare maneuvers. This was solved by making a moveable stabilator that reacted to airspeed and collective position. The large vertical tail was curved to maintain stability above 60 knots, even when the tail rotor was inoperative. However it obstructed the air flow from the tail rotor to the extent that tail rotor authority was quite limited. To overcome this, the upper portion of the tail pylon (in line with the tail rotor) was made narrower.

Another refinement was the "horse collar". Vibration resulting from main rotor created turbulence was caused by the resultant airflow encountering the upper tail rotor area in forward flight. A slight horizontal surface extension was added along the upper aft main rotor pylon areas to deflect this airflow downward, away from the tail rotor.

The above description is based on memory about information distributed to our design staff, so please forgive any inaccuracies.

A better source of information is the book about Black Hawk development written by Ray Leone.

Best regards,
Ron Caron

stupid, 12.05.2010 22:02


Michael Scheller, e-mail, 14.02.2010 06:58

Army aircraft are numbered sequentially based upon when they were ordered and the entire block of numbers is then set aside for that particular model of aircraft.

For instance, in 1978 57 UH-60s were ordered by the Army. They were 78-22960 through 78-23016. The next block of aircraft ordered for FY78 was 16 UH-1H's, 78-23017 through 23042.

In FY 1971, the Army went over to a new serial series for their helicopters, which started at 20000 and had continued consecutively since then.

Interesting read below that also allows you to find certain serial number aircraft or report their whereabouts.

Hugh Bailey, e-mail, 09.06.2009 20:37

Hello, I am in the Alabama National Guard out of Mobile, AL. We have airframe 78-23007 and 78-23009 in our inventory (still flying and just came back from Iraq). We know that this was the 7th and 9th A model delivered but I wanted to know what the 23 in the serial numbers meant? Thanks in advance if anyone can help.

Frank R. Lewis, e-mail, 11.07.2008 12:29

Hello, I was a crewchief of Blackhawk Helicopeters. I was assigned to A Co. 101st Air Group, 101st Airborn Division. The question I have is this, I was a crewchief for two of the original Blackhawks (tail numbers 78-23005 and 78-23006). Is there a way to track what happened to espicially 78-23005. I was and am very fond of Balls-5. I would like to know what happened to this aircraft. Hopefully after service, it was given to a muesuem.

Thank You,

Frank R. Lewis

John Hawk, e-mail, 24.05.2008 02:03

The UH-60Q designation has changed, with those four aircraft (the only ones ever built) being re designated HH-60A, and the UH-60Q designation being retired! And no, the UH-60 did not exist during the Vietnam era, sorry to disappoint!

jason humbert, e-mail, 08.04.2007 07:07

Do you know anything about the yuh-60a not initially having the shaft extension installed? Are there possibly any photos out there of this configuration? Any help would be greatly appreciated. Thank you.

Alastair Maher, e-mail, 26.03.2007 07:16

Do you know the color used to paint the Black Hawk? Is this color on the FEDERAL STANDARD 595B colour chart?

bobby lambert, e-mail, 21.01.2007 04:50

yes i do have a question for you ! and that is did the yuh or uh-60 fly in vitnam during the war in testing or after testing . i have heard that they did fly with the task force. special operations.

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