Mace-Trefethen Seamaster

Seamaster
General information
Type	Racing aircraft
National origin	United States
Designer	Harvey Mace, Al Trefethen, Tom Trefethen
History
Introduction date	1960s
Developed from	PAR Special

The Mace-Trefethen Seamaster is an American single seat seaplane racer.

Design and development

The Seamaster was built by Alfred and Thomas Trefethen and Harvey Mace, using components from the PAR Special pusher monoplane. It is a single place, mid-wing seaplane with a Y tail layout and a single 90 lb (41 kg) fuselage-mounted float. The pusher propeller configuration of the PAR Special was modified to that of a conventional tractor layout. ^{[1] [2] [3]}

Specifications (Seamaster)

General characteristics

• Crew: 1
• Length: 25 ft (7.6 m)
• Wingspan: 20 ft (6.1 m)
• Wing area: 66 sq ft (6.1 m²)
• Empty weight: 728 lb (330 kg)
• Powerplant: 1 × Continental O-200 Packet 60 , 90 hp (67 kW)

References

1. "Seamaster". Air Trails: 40. Summer 1971.
2. Fortier, Rénald (November 27, 2017). "Do you remember Joan Trefethen? I do, I do!, Part 1". ingeniumcanada.org. Ingenium Channel. Retrieved May 25, 2025.
3. "Mace-Trefethen "Seamaster"". Sport Aviation. 17 (1). Hales Corner, WI: Experimental Aircraft Association, Inc: 32. January 1968.