P-51D Mustang "Sierra Sue II" Flown by 1st Lt. Robert (Bob) Bohna, 402nd Fighter Squadron, 370th Fighter Group, 9th Air Force, Belgium, 1945.
Sierra Sue II is an iconic WWII Combat Vet P-51D Mustang operated by Wings of the North Museum in Minneapolis, MN. AirCorps Aviation had the opportunity to complete the restoration that started in 2011. The aircraft flies as one of the most accurately restored P-51 Mustangs in the world.
Sierra Sue has a rich history in Minnesota having been based here since 1979. Her longtime owner Roger “Doc” Christgau was an outstanding pilot and doctor and was well known on the local airshow circuit. You could often find Doc out with his airplane on Saturday mornings at Flying Cloud Airport at the old Planes of Fame East Air Museum.
Military History |
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| 25 November 1944 | 44-63675 is accepted by the Army Air Force. |
| 27 November 1944 | 44-63675 is delivered to the Army Air Force. |
| 29 January 1945 | 44-63675 is shipped overseas to Belgium. |
| 1st week of April 1945 | 44-36675 is assigned to 402nd Fighter Squadron, 370th Fighter Group, 9th Air Force (Code E6-D) and 1st Lt. Robert (Bob) Bohna. Bohna names the plane Sierra Sue II after a girl in his high school. |
| 1st half of 1947 | Sierra Sue II is purchased in one of the last lots of P-51’s by the Swedish Government and assigned the Swedish Air Force number Fv26152 and re-designated J26. |
| June 1948 | Sierra Sue II arrives at her new station F4 near Ostersund, Sweden. She is assigned to the third squadron (colored yellow) and gains the nickname of “Gul Kalle” which translated means yellow K (a yellow K is painted on the vertical tail). She is assigned to pilot Sten Soderquist who flies her for the next four years. |
| October 1952 | Gul Kalle is transferred to F8 near Stockholm for use as a staff plane. Redesignated “Gron Kalle” which means green K (yellow k is repainted green). She also has the name “Kleopatra” painted on the nose. |
| 18 September 1954 | Gron Kalle/Kleopatra is sold, disassembled, and shipped via the port of Malmo, Sweden to Nicaragua to serve in the Nicaraguan Air Force. Once in Nicaragua, she is reassembled and put into service at Las Mercedes Air Base near Managua as GN91. |
| By 1961 | GN91 is retired from service and eventually put on outdoor display at Las Mercedes. |
Civilian History |
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| 30 July 1971 | GN91 is purchased from the Nicaraguan Air Force by Dave Allender of San Mateo, California and registered as N5452V and Race number 19. Allender makes numerous modifications to the airplane and paints it bright red. |
| 8 March 1977 | Race 19 is sold to Roger “Doc” Christgau of Austin, MN. For a video about Doc’s life, check out this video from AirCorps: https://youtu.be/iAtLG05Meuk |
| 1977-1983 | Aircraft restored to a stock Mustang configuration by Jack Cochrane in Hollister, California. |
| 30 October 1979 | FAA registration changed to N1751D. |
| May 1983 | Sierra Sue departs Hollister, California for its new home in MN. The airplane is eventually repainted as Sierra Sue II in a semblance of her World War II markings on the left side of the fuselage. The right side of the fuselage is painted to partially resemble her Swedish markings as Gul Kalle. Roger owns the airplane for more than 30 years and is a fixture at airshows during the ’80’s and ’90’s. |
| 1 July 2011 | Sold to Paul Ehlen of Hamilton, Montana. Ehlen ships the airplane to AirCorps Aviation in Bemidji, MN for a complete restoration to factory specifications. |
| 17 September 2014 | Sierra Sue II’s first flight after a complete restoration by AirCorps Aviation in Bemidji, MN. For a complete look at the restoration online from AirCorps Aviation, go here: http://www.projects.aircorpsaviation.com/blog-sierrasueii/ |
| May 2015 | Sierra Sue II joins the Wings of the North collection as the cornerstone of its new museum. |
| 26 July 2015 | Paul Ehlen is awarded Reserve Grand Champion for Sierra Sue II at EAA’s AirVenture. AirCorps Aviation is awarded the Gold Wrench for their work on the restoration of Sierra Sue II. |
Chuck Cravens, historian at AirCorps Aviation, has put together a wonderful book on the restoration of Sierra Sue II. It can be purchased from Amazon.
Spruce up your room, man-cave, garage or toolbox with this vinyl decal paying tribute to the P-51 and the 370th Fighter Group! Comes with smaller vinyl decals that can be applied anywhere.
What makes our vinyl prints special?
Available in two material options!
Movable - Ready to make a move? Our vinyl wall prints are movable and reusable for interior application.
Permanent - Need it to stick? Our 3M decal material will adhere permanently. Great for trailers!
Variety of sizes - small, medium or large.
Authentic - Genuine high resolution images of your favorite aircraft bring life to any room!
Produced in the U.S.A. - Thoughtfully crafted by skilled AirCorps team members in Bemidji, MN.
