Aviation author & outsize aircraft historian

Aviation author & outsize aircraft historian

william patrick dean

The “Skymonster” Conroy CL-44 Guppy Fate Remains In Limbo

A few years ago I was saddened to learn of the planned destruction of another milestone in commercial aviation. Anytime an aircraft of significant importance is broken up, even if there was a fleet of them and a few others still exist it is a loss to the aviation history. In the case when a “one-of” aircraft is destroyed, it is a historical tragedy.  

Since the CL-44 Guppy left Tennessee in September 2002 and shortly thereafter was grounded in England, it’s fate has been in jeopardy. In the last twenty years, the last “Guppy” class aircraft designed by Jack Conroy has been slated for the chopping block. The only CL-44 guppy built 9G-LCA (N447T) has been parked at Bournemouth airport England for over twenty years. It was sometimes maintained but has been slowly deteriorating. Sometime ago, a longtime friend in London emailed and said the CL-44 was scheduled to be broken up on 11 February 2021. Three year have passed since then and somehow it has received a reprieve.

The story of the Conroy CL-44 Guppy is the first chapter in my next book, volume II of Ultra-Large Aircraft 1970-2025. The CL-44 should have been included in the first volume to round out Conroy guppy production, but space and deadlines changed the plan. This brief background tells the story.

Jack Conroy built the first B-377 Pregnant Guppy in 1962 by cobbling together multiple fuselage sections of retired Boeing Stratocruisers and grafting a 19-foot upper fuselage on top of the existing airframe. The “Frankenplane” flying contraption was constructed outside as if it were a backyard project. Although clumsy looking and underpowered, it saved the day for NASA by transporting rocket boosters and outsize hardware from the American west coast to Huntsville and the cape in hours instead of weeks. Marshall Space Flight Center director Wernher von Braun was so impressed that plans began immediately for a second larger version. The B-377 Super Guppy with a 25-foot diameter fuselage was even bigger, first flying in 1965.

Both the Pregnant and Super Guppy were built for exclusive NASA and DOD work. So many shortcuts were taken in construction to get them finished they had to be declared “public aircraft.” This designation is how military aircraft are certified which prevents them from ever being used as commercial transports without serious upgrades. Jack Conroy had envisioned a commercial version guppy from the outset. His next project was the B-377 Mini Guppy which first flew in 1967. It had a much longer 132-foot long fuselage with 91.5-foot cargo hold ahead of the fuselage break. The smaller diameter fuselage is 15.5-foot high and was the only B-377 guppy with a hinged swing tail. The Mini was a commercial success almost immediately and a money maker for it’s entire service career.

Shortly after the Mini Guppy was completed, Jack Conroy had a dust up with the management of Unexcelled Corporation, which was the parent of Aero Spacelines. Conroy departed and went across the field at Santa Barbara Airport and founded Conroy Aircraft Corporation. Aero Spacelines went on to produce a turbine powered mini version designated the MGT-101 Mini Guppy. Two more second design Super Guppy SGT-201s were also produced in Santa Barbara and two in France for Airbus. 

Conroy had multiple aircraft modification projects in progress at his new company in 1970, including the Turbo-Three and STOLifter. However, his primary objective was a new type of expanded fuselage Mini Guppy with visions of an advanced Super Guppy based on the Canadair CL-44. This airframe was selected for multiple reasons. As a long-range turbine powered swing-tail cargo aircraft with a 136-foot long fuselage, it was the perfect candidate for conversion. 

Construction begins at Santa Barbara by removing the upper fuselage half Photo: via Tom Smothermon

Without suitable facilities at Santa Barbara, Jack Conroy was once again faced with converting an airframe outside. This time however, as the airframe was dismantled and cut longitudinally at floor level a temporary hangar was built over it. Everything about the CL-44 was perfect for conversion. It would not need to be stretched or require sections from other aircraft. The amount of engineering and fabrication was considerably less than the previous B-377 conversions had been. 

Conroy acquired several redundant CL-44s from Flying Tiger Airlines in a rather curious but not defined deal with CEO Robert Prescott. While several CL-44s were supporting oil well operations in Alaska for Mobil Oil, Conroy began converting N447T. The new Conroy model 103 was the first with plans to convert the others when they returned from Alaska. The expanded CL-44 flew from Santa Barbara on 28 November 1969. The flight was commanded by Captain Jim Seymour with Lockheed test pilot Herman “Fish” Salmon as co-pilot and Jeff Seidemen as flight engineer. Seymour had logged more than 5,000 hours on the CL-44. The modified Conroy CL-44 had a new volumetric fuselage which was more oval at eleven feet high and thirteen feet wide at mid height. Throughout the spring of 1970, it was flown in a test and certification program. 

Jeff Seideman, Capt. Jim Seymour, Herman “Fish” Salmon

Photo: (courtesy) Jim Seymour II

On 08 April 1970 during certification testing the modified CL-44 was flown to 25,000 feet with a FAA pilot in command. The pilot nosed the aircraft over for a dive test with too much power on. The aircraft accelerated downward past Mach .73 at which time they lost control. The aircraft began violently shaking almost coming apart. It began sheading panels and parts. The tail was damaged as the co-pilot who was a seasoned CL-44 captain gained control and leveled off at 15,000 feet. The aircraft suffered severe damage, but the crew was able to land safely at Edwards Air Force Base. The next day, Conroy and his team were on a conference call to Canadair about the incident. The Canadair team was shocked. One of the engineers stated, “You flew it to .75 Mach and you are still alive.” The aircraft was repaired over the next few months; however, the left horizontal stabilizer had been distorted and always had a downward droop the entire operational life.”

Shortly after it was repaired and certified, Conroy forfeited the CL-44 Guppy because of financial difficulties. Robert Prescott, who had not been fully paid for the aircraft, negotiated a lease, sale agreement with T.D. Mike Keegan of Transmeridian Air Cargo and British Air Ferries (BAF). Keegan already operated standard cargo CL-44s and ATL-98 Carvairs under BAF. The (Conroy 103) CL-44 Guppy was renamed “Skymonster” and was an immediate success. Mike Keegan’s brother Kevin stated years later that the guppy grossed more profit in cargo transport than all the other CL-44s in his fleet combined. This was the last guppy type conversion produced by Jack Conroy. He had conducted engineering studies and made major plans for an even larger diameter CL-44 named the Colossus with a 25-foot plus diameter fuselage and 152-foot length with six engines. Sadly, it was never produced.      

N447T in her better days Photo: Paul Hooper

Transmeridian operated the CL-44 until December 1978 when it was sold to Heavyweight International. It was owned or leased by multiple carriers and individuals over the next 25 years including  British Cargo Airlines, Aviation Leasing Group (ILG/LCA), Heavylift Cargo Airlines, Buffalo Airways, Azerbaijan Airlines, BAKU Express, First International Airlines (FIA), and Johnsons Air. Many of the operators were subcompanies of ILG/LCA, which was controlled by Farhad Azima. The aircraft was identified with corrosion problems in the center-wing in the 1990s but continued in cargo service. It was eventually grounded at Smyrna, Tennessee. A onetime ferry permit was issued to fly it to Teeside Airport in England in 2002. It carried the registration of 9G-LCA. It was subsequently moved to Bournemouth, U. K. in 2003 where it has remained in questionable condition.  

The ownership passed between multiple individuals and companies, some with rather questionable intentions and credentials. It was reported to have been sold to Geoff Leach in 2003. Leach became involved in a shadowy situation with his son regarding ownership. Attempts were made to get maintenance items signed off by unqualified personnel. The engines were removed and shipped to Australia and stored. The next owner was David Berry, who registered it in the Philippines for an upstart cargo service in 2006. The last owner, in 2016, was an American named Wayne Harland Jordan. All the while the “Skymonster” remained at Bournemouth. When it arrived there in 2002, it was known to have severe wing root and center-wing corrosion issues. British authorities would not allow it to fly until repaired, which may have been impossible even then. There were no spares available, and Canadair jigs had long ago been destroyed. After years of speculation and an uncertain fate, the end was scheduled for 11 February 2021 when dismantling was planned at Bournemouth and it was moved to a scrapping area.  

The “Conroy 103 or Skymonstser” CL-44 is a “one-of-one” aircraft. In the opinion of many, it should have been placed in a museum or allowed to stand in public view for all to marvel and enjoy. This was the second time in only two months a milestone aircraft has been planned for scrapping. On 20 December 2020, the SGT-201 Super Guppy F-BTGV was broken up at Bruntingthorpe Airfield, England. It was the first SGT-201 (N211AS) originally built at Santa Barbara as a demonstration model after Conroy’s departure from Aero Spacelines. Airbus acquired it to transport A300 aircraft components between factories around Europe. Three more SGT-201s were built for Airbus and served well until replaced by the A300-600ST Beluga and now the A330-743L Beluga XL.

We are fortunate to have aircraft museums to preserve some famous and unique aircraft. Sadly, we now live in a throwaway world where little effort is made to preserve these historical flying giants. It is true they are large and require considerable space for display. However, monuments and examples of the past are no longer appreciated or respected. Milestones in aviation history have lost importance in recent years. In all fairness, this is not of late. There have been incidents in times past when significant “one-of” or low production aviation design have been destroyed with much regret after the fact.

In 1953, Northrop was ordered by the U.S. Government to destroy all YB-49 Flying Wing airframes in production. Not one example was preserved. The Wright-Patterson aircraft museum even destroyed the first hand built YC-124 which had been converted from a Douglas C-74. The museum allowed it to be used for fire department practice. Incidentally, no Douglas C-74s were preserved. We only have photos and short archival footage to remember and appreciate these unique limited production aircraft.  

Whether it is for economic reasons, politics, or the short-sightedness of colossal ignorance and blazing stupidity, these milestones in aviation development are lost forever. They pass into the recesses of time and are forgotten in a generation, a shame when their significance in aircraft development is difficult to appreciate in just photos and drawings. 

Nothing can take the place of seeing one of these flying giants. Anyone who visits the Pima Air Museum at Tucson, Arizona or Musee Aeroscopia at Toulouse-Blagnac, France understands when they see the original B-377 Super Guppy or SGT-201 on display. Wherever the NASA Super Guppy, Boeing 747LCF or Airbus Beluga land there are always gawking spectators peeking through the fence with cameras trying to get a glimpse. But, society in general no longer seems to care about history. The CL-44 “Skymonster,” a very special aircraft, has an uncertain fate with moving appointments with the scrap-man. I wonder if anyone would show concern if plans were made to scrap the “Enterprise, Discovery, Atlantis or Endeavour space shuttles”? After all they are cargo aircraft. Do children even learn about aviation achievements in school anymore? 

There are those who claim the CL-44 is still airworthy however, it is more of an intact museum piece than a flyable airframe. To lift the grounding order the CAA would require proof of sufficient remedial certification work being completed to make it airworthy. The cost of repairs would be millions of dollars. Corrosion in the wing roots exist and is believed to be extremely severe. Patching and “doubler plates” would not be sufficient. The wing spar would need replacement which would require support from Bombardier (Canadair successor). The four Rolls-Royce Tyne engines would require overhaul at a minimum cost of $800,000 USD. The type certificate for the engines has long been cancelled and the props are unsupported with no overhaul facility certified for service. Finally there is no longer a type rated crew to fly it.

As of 12 February 2024, the CL-44 Guppy “Skymonster” is still intact. It is currently parked on a hardstand separate from other aircraft. (Header Photo Courtesy: Nigel Poll 02 Feb 24) Unfortunately she languishes at Bournemouth with an uncertain fate.

The engines were previously advertised for sale in April 2023, however they appear to still be mounted on the aircraft since the cowlings are in place. The prop has been removed from #3 engine. The airframe appears intact as noted from a distance. However, it has been allowed to deteriorate with considerable mold buildup on the entire aircraft. Some of the old crew members who have long since retired have expressed concern of her fate. No information is currently available as to the disposition of this giant. At such time some movement is observed or we learn of any decision, it will be reported here. Hopefully it will be acquired by a museum or placed on public display.

There was a time when an airplane flew over and people would stop and look up. I still do. Will that time ever return?

Photo: Nigel Poll 02 Feb 24

  1. Leslie C. Taylor says:

    Pat, In the left photo, the helo farthest from the camera may be a Bell aircraft, but the one in the foreground is a Sikorsky and probably an S-58. Les

  2. Steve says:

    I was at Bournemouth Airport today and I would like to confirm the Guppy has not been broken up!! I was told by another source it had been scrapped, but it was still parked at BOH today.
    Not sure why it was confirmed of its scrapping, but still parked in the same place at BOH.

  3. Mr Stephen Beavis says:

    Hi William!, sorry news indeed that the convoy is no more!, what a shame even duxford would not take the old lady I grew up living at standard and saw it many times I loved the cl-44 sound of those tunes a great sound!, I know the chap mr porter ex loadmaster tried in vain to save this great prop cargo carrier!, the airbritan book on the cl-44 was very informative thank god I have loads of pics when serviceable a lovely model and still make kits of them

  4. Hello mr.Dean,
    Could you please alter the title of this article. The aircraft is sitill in airworthy condition and FAR from being scrapped. Therfor its tedious to my opinion to write as if it has already happend. She’s still complete. I will keep you posted on any developments. Sincerely, Peter van Leeuwen CL44.COM

  5. Patrick Dean says:

    Thanks to everyone for your comments and updates. The CL-44 essay has been updated to reflect the aircraft has once again received a reprieve from the scrap man.

  6. Ken Miller says:

    Wow…. the suspense is almost too hard to take. Fingers crossed as always for the Sky monster.

  7. LeRoy Fry says:

    I was a flight mechanic on this aircraft for over a year back in 1995 when it was operated by Buffalo Airways. I transitioned to it from the DC-8 and the B-707 because no one wanted to work or fly on it. Being only 24 years old, I jumped at the chance. We only had two sets of flight crews and four dedicated mechanics to the aircraft so we were a close group of guys. I learned very quickly how realizable it was compared to the DC-8 and the B-707. Our service ceiling was only 20,000’ because the the pressurization for that much area was difficult using the original pressurization system for the Smaller original, CL-44 Skymaster fuselage. My only complaint was how loud and cold it was within the currier and cargo sections of the Guppy. Other than that, I absolutely loved the aircraft, and my brothers who operated and maintained it. I took pride in showing it off wherever we landed. Funny I seen pictures of it two or three owners later and still noticed some of my touch ups were still being maintained. We came back to home base for a couple of weeks and I decided to paint two black stripes on the horizontal stab to hide the exhaust streaks left by the two inboard engines. And the fiberglass crown above the cockpit, where an emergency exit hatch is located, had been paint peeled for years. I reglassed it and repainted to a glossy dark gray that I noticed still held up well over the years. Obviously, someone had kept up with my contributions to the ships esthetics, which made me proud.

    I traveled all over the world hauling all kinds of goods on the Guppy. Secret Full size clay model cars( with curriers included to make sure we didn’t take pictures), oil drilling equipment to St. Croissant, empty one gallon jugs for water to st. Thomas after Hurricane Andrew, military vehicles, an entire engine change equipment for a B-767 to Bermuda, Roll Royce aircraft Engine parts to England, just to name a few. But our “meat and potato” run was hauling B-777 Reversers from Boeing field in Wichita, KS to Boeing in Seattle. These were just a few of many trips that I made on This one of a kind, aircraft. I was also responsible as a loadmaster of Guppy. We I was done unloading and loading the cargo, I would have opportunity to work on the plane which means when I was done with those duties, it was usually time to take off again for the next destination. Though I am still an aircraft mechanic today, I still like to check up on one of the great experiences of my life. Hope she gets in the air soon. I wouldn’t mind working on the ol girl again.

  8. Gregory says:

    Hi there was just wondering is the aircraft ever going to fly again or is it going to be scrapped

  9. Christian Ward says:

    I wish I lived near Bournemouth to go and see this. Such a shame

  10. Jamie cole says:

    After living in poole most of my life and going past Hurn all the time I always wondered why it wad just sat there. At one point I was told by the aviation museum opposite Hurn that it was going to be going to Germany to be in a museum(if memory serves me right) but that was a fair few years ago now. I just came across this page after seeing a Facebook marketplace listing for 4 cl44 engines and I would guess these would be from the guppy so possibly it’s finally been broken up unfortunately 🙁

  11. Nathan says:

    Here is the advert for the engines:

    About to be removed from the world famous Guppy CL44
    Running order
    There are 4 enh
    Gines at £1000 each

    If you have any questions please ask

  12. Scott FW says:

    Hey Y’all. Aircraft is still there on NW side of what used to be runway 17/35 in Google Maps aerial photo dated 2023, no month given. And it has engine cowlings and propellors in place in the image which may or may not be from before Nathan’s March 29 post.

  13. Ian Teague says:

    I passed through Bournemouth Airport today, 18th Sept 2023 and the CL-44 was still there, intact with engine cowlings and props in place. I assume engines were also in situ. It even looked clean and shiny, though I was at the arrivals terminal on the other side of the airfield to the Guppy, so a fair way away, even with binoculars

  14. NP says:

    Hi all. I work in an office overlooking the CL-44 and it’s still in one piece (just about) but rather the worse for wear. Its still where Google Maps’ satellite view shows it (50°47’07.8″N 1°50’36.9″W). I’ll email a couple of photos to William that he can publish here is he wishes.

  15. Jose A Munoz says:

    I am glad the Guppy is still in one piece.
    I hope someday in the near future this marvel could be placed in a public place as a static display. Instead of destroying it along with it superb history .

    Captain Jose A munoz

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