Horsham Township in Montgomery County, Pennsylvania — The American Northeast (Mid-Atlantic)

Convair YF-2Y “Sea Dart”

Photographed by William Fischer, Jr., March 8, 2025

1. Convair YF-2Y “Sea Dart” Marker

Inscription.
Type: US Navy Experimental seaplane
Service Dates: Circa 1955
Crew: One
Tech Specs:
• Power Plant: Two Westinghouse J-46-WE-32 turbojets, 3400 lbs. thrust each
• Max Speed: 825 mph
• Range: 513 miles
• Dimensions: Wingspan 33' 8", Length 52' 7", Height 20' 9" with skis extended
•Gross Weight: 21,500 lbs.
•Weapons: none

History:
The Sea Dart in the DVHAA collection, Bureau #135763 is an experimental aircraft.

Designed as a water-based fighter, it took off and landed on a pair of retractable hydro-skis. Underpowered and subject to heavy vibration during takeoff, the aircraft was difficult to control on the water. The program was cancelled in 1956. Five were built, four survive.

Bureau #135763 was the ground test vehicle, and never flew.

This aircraft is on loan from the National Museum of Naval Aviation, Pensacola, FL

Erected by Delaware Valley Historical Aircraft Association.

Topics. This historical marker is listed in these topic lists: Air & Space • War, Cold. A significant historical year for this entry is 1955.

Location. 40° 12.109′ N, 75° 8.377′ W. Marker is near Horsham, Pennsylvania, in Montgomery

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County. It is in Horsham Township. It is on Easton Road (Pennsylvania Route 611) half a mile south of County Line Road ( Route 132), on the right when traveling south. Marker and aircraft are on the DVHAA Harold F. Pitcairn Wings of Freedom Aviation Museum grounds. Touch for map. Marker is at or near this postal address: 1155 Easton Road, Horsham PA 19044, United States of America. Touch for directions.

Regionally, this marker is in Southeast Pennsylvania and in Greater Philadelphia.

It is also in the American Northeast

and in the Mid-Atlantic.

Globally, it is in North America,

the Western Hemisphere,

the Western World,

and the Anglosphere.

Historically, it finds itself in what was once the Haudenosaunee (Iroquois) Confederacy

and also one of the original Thirteen Colonies.

Other nearby markers. At least 8 other markers are within 3 miles of this marker, measured as the crow flies: Grumman F9F-2 "Panther" (within shouting distance of this marker); McDonnell Douglas A4M "Skyhawk" (within shouting distance of this marker); Horsham Township (approx. 1.3 miles away); Keith House (approx. 1.3 miles away); Horsham Friends Meeting Meeting House

Convair YF-2Y “Sea Dart” and Marker image. Click for full size.

Photographed by William Fischer, Jr., March 8, 2025

2. Convair YF-2Y “Sea Dart” and Marker

(approx. 1.3 miles away); Log College (approx. 2.3 miles away); The Battle of Crooked Billet Monument (approx. 2.3 miles away); Crooked Billet (approx. 2½ miles away). Touch for a list and map of all markers in Horsham.

Also see . . .
1. DVHAA Harold F. Pitcairn Wings of Freedom Aviation Museum. (Submitted on March 8, 2025, by William Fischer, Jr. of Reynoldsburg, Ohio.)
2. Sea Dart jet seaplane skimmed into history (Johnsen, 2018). (Submitted on March 8, 2025, by William Fischer, Jr. of Reynoldsburg, Ohio.)

Convair YF-2Y “Sea Dart” image. Click for full size.

via General Aviation News, 1960s

3. Convair YF-2Y “Sea Dart”

The Convair Sea Dart thunders though its own spray during flight operations on San Diego Bay in the 1950s. Pounding of the hydro ski struts was a problem during testing. (Peter M. Bowers collection)

Credits. This page was last revised on March 10, 2025. It was originally submitted on March 8, 2025, by William Fischer, Jr. of Reynoldsburg, Ohio. This page has been viewed 135 times since then and 8 times this year. Photos: 1, 2. submitted on March 8, 2025, by William Fischer, Jr. of Reynoldsburg, Ohio. 3. submitted on March 10, 2025, by Larry Gertner of New York, New York.