Did the helicopter really climb by itself?

Introduction

One reason the Coyne incident remained prominent in Ohio UFO history is that it involved more than a report of unusual lights. The helicopter crew described a cluster of aviation-related anomalies: interrupted radio communications, erratic compass behaviour and an apparent climb that seemed to occur while the aircraft was supposed to be descending. These details turned the Mansfield encounter from a simple sighting into a debate about flight mechanics, instrumentation and pilot perception. The anomalies are often presented as evidence that something physically interacted with the helicopter. Critics argue that each element has more ordinary possible explanations, even if none fully settles the case. The difficulty is that the reported effects overlap in time, making it hard to determine whether they were connected to a single cause or were separate events interpreted through the stress of a near-collision situation. [Center for UFO Studies]cufos.orgCenter for UFO Studies A Helicopter-UFO Encounter over OhioAs 10,000 feet was reached, the "vertical speed needle moved rapidly from descent to…Read more…

What the crew reported about radio and compass effects

According to the crew’s accounts, Captain Lawrence Coyne attempted to contact Mansfield air traffic facilities while the approaching light appeared to be closing on the helicopter. The crew later reported difficulty establishing communications at the height of the encounter. In some retellings, several radio channels seemed unavailable until after the object had departed. UFO investigators treated this as a possible electromagnetic effect associated with the object. [Center for UFO Studies]cufos.orgCenter for UFO Studies A Helicopter-UFO Encounter over OhioAs 10,000 feet was reached, the "vertical speed needle moved rapidly from descent to…Read more…

The radio issue is one of the weaker pieces of evidence when examined on its own. Later discussions of the case noted that military helicopter avionics of the period were not always reliable, and one of the crew members later remarked that radio performance problems were not unheard of. Skeptical writers have also argued that low altitude, distance from particular stations or ordinary reception limitations could explain at least some of the communication difficulties. The challenge is that the reported outage was brief and not independently recorded, leaving investigators dependent largely on crew testimony. [kevinrandle.blogspot.com]kevinrandle.blogspot.comfollowing is long posting about coyneHere Jezzi… explain the failure while the UFO is nearby. Klass' explanation…Read more…

The compass claim has attracted more attention. Coyne and other crew members reported that the helicopter’s magnetic compass behaved abnormally after the close approach. Some accounts describe the compass card rotating continuously rather than settling on a heading. Investigators later reported that maintenance personnel were unable to correct the problem and that the unit was ultimately replaced. That detail became one of the most frequently repeated arguments for a genuine physical effect on the aircraft. Cleveland Ufology Project [Ashland Source]ashlandsource.comcoyne incident over charles mill lake was most credible ufo sighting of 1973Ashland SourceCoyne Incident over Charles Mill Lake was most credible…4 Oct 2020 — Coyne had also noticed that during the incident his…

Even here, however, the evidence has limits. No publicly available maintenance report demonstrating the cause of the compass malfunction has emerged. A faulty compass does not automatically imply an external electromagnetic field, since magnetic compasses can fail for ordinary mechanical or magnetic reasons. What keeps the point alive in discussions of the case is the timing: the crew linked the reported malfunction directly to the encounter rather than to a pre-existing maintenance problem. [Ashland Source]ashlandsource.comcoyne incident over charles mill lake was most credible ufo sighting of 1973Ashland SourceCoyne Incident over Charles Mill Lake was most credible…4 Oct 2020 — Coyne had also noticed that during the incident his…

The claimed climb during the evasive descent

The most controversial aspect of the incident is the reported climb.

As the bright object appeared to approach on a collision course, Coyne reportedly pushed the helicopter into a rapid descent to avoid it. Witness statements generally place the aircraft at roughly 1,700 feet when the object came very close and illuminated the helicopter with a green light. After the object moved away, the crew noticed that the helicopter was no longer descending. Instead, the altimeter indicated a substantial climb. Estimates vary somewhat between retellings, but the aircraft was said to have reached approximately 3,500 to 3,800 feet before normal control was re-established. Cleveland Ufology Project [Ashland Source]ashlandsource.comcoyne incident over charles mill lake was most credible ufo sighting of 1973Ashland SourceCoyne Incident over Charles Mill Lake was most credible…4 Oct 2020 — Coyne had also noticed that during the incident his…

What made the claim striking was Coyne’s insistence that he had already lowered the collective control during the evasive manoeuvre. In helicopter flight, lowering the collective reduces rotor blade pitch and therefore lift. According to his account, the aircraft should not have been climbing under those control inputs. Some versions of the story describe the helicopter as if it were being “pulled” upward, although that language reflects witness interpretation rather than a measured aerodynamic process. [Cleveland Ufology Project]clevelandufo.comCleveland Ufology ProjectCoyne Helicopter Incident – 197318 Oct 1973 — After the object had broken off its hovering relationship, Jezzi a…

The crew also reported something that investigators considered unusual: they noticed the earlier descent physically, including the sensation of g-forces, but did not immediately perceive the climb. Instead, they became aware of it after checking the instruments. Supporters of the UFO interpretation have argued that this made the climb less likely to be a simple overreaction or conscious pilot error. [Cleveland Ufology Project]clevelandufo.comCleveland Ufology ProjectCoyne Helicopter Incident – 197318 Oct 1973 — After the object had broken off its hovering relationship, Jezzi a…

Yet the climb remains difficult to verify independently. No flight recorder, radar track or telemetry data exists to confirm the exact altitude changes. The case depends almost entirely on the recollections of four witnesses describing a stressful event that unfolded in darkness over a matter of seconds. [Center for UFO Studies]cufos.orgCenter for UFO Studies A Helicopter-UFO Encounter over OhioAs 10,000 feet was reached, the "vertical speed needle moved rapidly from descent to…Read more…

Could a helicopter climb without the pilot intending it to?

The question that often interests aviation-minded readers is whether the climb necessarily requires an extraordinary explanation.

The answer is no. A helicopter can gain altitude for reasons other than a pilot consciously commanding a climb. Updrafts, changes in airflow, altered rotor efficiency and pilot control inputs made under stress can all affect altitude. Helicopter flight is especially sensitive to power settings, rotor state and vertical air movement. In principle, a helicopter descending with reduced power could begin gaining altitude if it encountered a strong enough upward-moving air mass. [kevinrandle.blogspot.com]kevinrandle.blogspot.comThe Coyne Helicopter EncounterExplained?1 May 2018 — If a helicopter would just maintain the same power, and the air itself would began moving upwards, the net effect…Published: May 2018

That does not mean such an explanation is proven in the Coyne case. Critics have proposed several possibilities:

Supporters of the original account counter that these suggestions remain speculative because they require assumptions not reported by the witnesses. They point out that experienced military aviators generally understand the relationship between collective pitch and climb rate, and they argue that the reported combination of visual encounter, compass behaviour and altitude change deserves to be considered as a connected event rather than as isolated errors. [Center for UFO Studies]cufos.orgCenter for UFO Studies A Helicopter-UFO Encounter over OhioAs 10,000 feet was reached, the "vertical speed needle moved rapidly from descent to…Read more…

Ordinary faults versus extraordinary explanations

The radio trouble, compass anomaly and climb are often grouped together as though they form a single piece of evidence. In reality, each has a different evidential value.

The radio issue is the easiest to explain conventionally because intermittent communications were not unknown in military aviation, and there is no surviving technical record showing a unique malfunction. [kevinrandle.blogspot.com]kevinrandle.blogspot.comThe Coyne Helicopter EncounterExplained?1 May 2018 — If a helicopter would just maintain the same power, and the air itself would began moving upwards, the net effect…Published: May 2018

The compass claim is harder to dismiss entirely because it concerns a specific instrument reportedly requiring replacement after the event. At the same time, without maintenance documentation showing why the compass failed, the incident cannot establish a clear electromagnetic effect. [Ashland Source]ashlandsource.comcoyne incident over charles mill lake was most credible ufo sighting of 1973Ashland SourceCoyne Incident over Charles Mill Lake was most credible…4 Oct 2020 — Coyne had also noticed that during the incident his…

The climb remains the central mystery. It is the part of the story that most directly raises questions about aircraft behaviour rather than simple visual identification. However, it is also the part least supported by independent data. The reported altitude gain comes from witness testimony and cockpit instruments rather than external tracking. That leaves investigators balancing two possibilities: either the crew experienced a genuinely unusual flight event that has never been satisfactorily reconstructed, or the circumstances of a frightening night encounter produced a chain of misinterpretations that later became fused into a single dramatic narrative. [Center for UFO Studies]cufos.orgCenter for UFO Studies A Helicopter-UFO Encounter over OhioAs 10,000 feet was reached, the "vertical speed needle moved rapidly from descent to…Read more…

Within the broader Mansfield helicopter encounter, the flight anomalies are therefore important not because they prove the object was extraordinary, but because they complicate simple explanations. The case has endured in Ohio UFO history largely because the reported radio failures, compass behaviour and unexpected climb sit in an uncomfortable middle ground: unusual enough to resist easy dismissal, yet not documented strongly enough to compel a definitive conclusion. [Center for UFO Studies]cufos.orgCenter for UFO Studies A Helicopter-UFO Encounter over OhioAs 10,000 feet was reached, the "vertical speed needle moved rapidly from descent to…Read more… [Cleveland]clevelandufo.comCleveland Ufology ProjectCoyne Helicopter Incident – 197318 Oct 1973 — After the object had broken off its hovering relationship, Jezzi a…

Amazon book picks

Further Reading

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Encourages analysis of anomalous observations rather than simple conclusions.

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Endnotes

1. Source: kevinrandle.blogspot.com
   Title: following is long posting about coyne
   Link: https://kevinrandle.blogspot.com/2025/04/following-is-long-posting-about-coyne.html
   Source snippet

   Here Jezzi... explain the failure while the UFO is nearby. Klass' explanation...Read more...

2. Source: kevinrandle.blogspot.com
   Title: The Coyne Helicopter Encounter
   Link: https://kevinrandle.blogspot.com/2018/05/the-coyne-helicopter-encounter-explained.html
   Source snippet

   Explained?1 May 2018 — If a helicopter would just maintain the same power, and the air itself would began moving upwards, the net effect...

   Published: May 2018

3. Source: cufos.org
   Title: Center for UFO Studies A Helicopter-UFO Encounter over Ohio
   Link: https://cufos.org/PDFs/books/A%20Helicopter-UFO%20Encounter%20Over%20Ohio.pdf
   Source snippet

   As 10,000 feet was reached, the "vertical speed needle moved rapidly from descent to...Read more...

4. Source: clevelandufo.com
   Link: https://clevelandufo.com/?page_id=18
   Source snippet

   Cleveland Ufology ProjectCoyne Helicopter Incident – 197318 Oct 1973 — After the object had broken off its hovering relationship, Jezzi a...

5. Source: ashlandsource.com
   Title: coyne incident over charles mill lake was most credible ufo sighting of 1973
   Link: https://www.ashlandsource.com/2020/10/04/coyne-incident-over-charles-mill-lake-was-most-credible-ufo-sighting-of-1973/
   Source snippet

   Ashland SourceCoyne Incident over Charles Mill Lake was most credible...4 Oct 2020 — Coyne had also noticed that during the incident his...

Additional References

1. Source: facebook.com
   Link: https://www.facebook.com/timesreporter/posts/reports-of-ufo-visits-to-ohio-have-increased-in-the-nearly-50-years-since-one-of/10158950344662636/
   Source snippet

   Reports of UFO visits to Ohio have increased in the nearly...28 Mar 2022 — The captain of the helicopter that night was Larry Coyne, and...

2. Source: youtube.com
   Link: https://www.youtube.com/watch?v=QWAmexZYSRQ
   Source snippet

   The Mansfield Coyne UFO IncidentConsidered one of the most credible UFO sightings of the 20th century, the Mansfield UFO incident of 1973...

3. Source: facebook.com
   Link: https://www.facebook.com/RichlandSource/posts/to-this-day-the-coyne-incident-near-charles-mill-lake-is-considered-one-of-the-m/411797874285889/
   Source snippet

   As a result of the Condon Report (1968), which concluded there was nothing anomalous...Read more...

4. Source: facebook.com
   Title: What happened in the skies over Charles Mill Lake on Oct
   Link: https://www.facebook.com/ohiomagazine/posts/what-happened-in-the-skies-over-charles-mill-lake-on-oct-18-1973-still-sparks-cu/1392032946260763/
   Source snippet

   Coyne helicopter UFO incident over Mansfield, Ohio. Jim Lawrence... anomalies, or known aircraft. Radar data and flight logs supported...

5. Source: facebook.com
   Link: https://www.facebook.com/CisNyakundi/posts/could-the-pilot-have-avoided-the-crash-if-the-aircraft-had-not-proceeded-in-such/1460457598773751/?locale=lv_LV
   Source snippet

   ation, a major factor in many helicopter accidents, ie Kobe's flight.Read more...

6. Source: reddit.com
   Title: the 1973 coynemansfield helicopter ufo incident
   Link: https://www.reddit.com/r/UFOs/comments/8gf3nj/the_1973_coynemansfield_helicopter_ufo_incident/
   Source snippet

   The 1973 Coyne/Mansfield helicopter UFO incident finally...The tanker crew noticed something is not right, such as the helicopter missin...

7. Source: reddit.com
   Title: the 1973 coynemansfield army helicopter ufo
   Link: https://www.reddit.com/r/UFOs/comments/1pc603m/the_1973_coynemansfield_army_helicopter_ufo/
   Source snippet

   The 1973 Coyne/Mansfield Army Helicopter UFO EncounterArmy helicopter encounters a cigar-shaped UFO at night, has their cockpit "scanned"...

8. Source: youtube.com
   Link: https://www.youtube.com/watch?v=m5SHLk_NDxw
   Source snippet

   Lawrence Coyne UFO encounter 1973 radio climb US Army Helicopter Attacked By UFO- The Coyne Incident Ohio 1973 Info-Collector-Archive...

9. Source: facebook.com
   Link: https://www.facebook.com/MansfieldNewsJournal/posts/reports-of-ufo-visits-to-north-central-ohio-have-increased-in-the-nearly-50-year/10159047681874862/
   Source snippet

   ude was 1,700 feet above sea level. The difference...Read more...

10. Source: ohiomagazine.com
    Title: The Case of Ohio’s Best Documented UFO
    Link: https://www.ohiomagazine.com/ohio-life/article/the-case-of-ohio-s-best-documented-ufo
    Source snippet

    Coyne Incident... The helicopter continued to Cleveland none the worse for wear with one noticeable exception: The compass was broken an...