2026 Osprey GP-4Experimental Aircraft • Cedar Rapids, IA, USA

This Osprey GP-4 is an unfinished experimental project offered for sale at $25,000 and located in Cedar Rapids, Iowa. According to the seller, the airframe was built to the plans without significant modifications and is at an honest 98-plus percent completion point. The project is essentially complete except for one piece of skin forward of the windscreen, installation of the windscreen, and procurement and installation of the cowl. It still requires all interior appointments, exterior fit and finish, avionics, and most everything north of the firewall. The seller notes that no damage history is reported and encourages interested parties to...

Year: 2026

Make: Osprey

Series: GP-4

Model: GP-4

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Specifications

Category: Experimental

Intended Use: Recreational

Hours, Logs & Inspections

Engine 1 Time: 360 hrs

Avionics

Comms

Internal antennas installed per the plans for Comms (1 in vertical stabilizer and 1 in right wing), VOR/Glideslope and Marker Beacon in aft fuselage, and Transponder in lower fuselage. Antennas wired to avionics bay with high quality coaxial cable. Avionics not yet installed.

Additional Equipment

Oil Cooler

Airflow Systems 20006A - New oil cooler, NDM P/N mounted on firewall shelf

Landing Gear

Parker 1000 PSI Hydraulic Power Unit - landing gear complete. All main gear components professionally welded and painted with self etching primer. Main gear doors installed and fit perfectly. psi installed. All three gears cycle well on jacks.

Flaps

Vans RV-6/7/8/9 Linear Actuator - Flaps extended and retracted by new Maximum flap deflection is correct.

Fuel System

Mitchell Float Sensor - system complete through firewall mounted filter. Includes gallon centerline fuselage tank and gallon tank in each wing (approximate). All tanks pressure tested. Wing tanks use sight gauges. Fuselage tank uses and panel indicator. Quick drains installed. Four position tank selector. P/N providing PSI, suitable for injected engines.

Canopy

3/16" clear canopy installed and sliding well on cabin rails. Forward and aft locking pins engage when canopy is closed. Tight fitting skirt installed. 1/4" thick lightly smoked windscreen included and cut to size, but not installed.

Control Cables

All control cables throughout airframe are stainless steel with end fittings professionally swaged by Aircraft Spruce.

Pitot Tube

12-AN5812 - New heated pitot tube, type installed.

Pitch Trim

Ray Allen Electric Pitch Trim - New system installed.

Wheels and Brakes

Cleveland Wheels - New with rudder pedal cylinders reservoir installed.

Strobe Lights

Whelen HDAFC - New model HDAFC strobe power supply (multi-flash) with combination strobe/position lights on wingtips and tail installed.

Cabin Air Vents

NACA inlets, aeroduct, and cabin air vents installed.

Instrument Panel

GT-50 Flight Data System - Three sections, removable for servicing. Left panel: headset jacks, auto dimming gear indicator and warning with test function, flap, pitch trim and trim indicators trim indicator wired but no actuator installed), vacuum split master switch, ignition switch with two keys, (clock, timer, G-meter, and OAT). Center panel (all used): airspeed indicator, electric turn coordinator, artificial horizon, directional gyro, altimeter, vertical speed indicator, two unused positions for navigation instruments. Right panel: seven internally lit combination switches/circuit breakers for pitot heat, strobes, panel avionics master, nav landing and fuel pump (all new), tachometer (new), combination TSO'd Fuel Flow Manifold (new), switch selected Exhaust Gas and Cylinder Head (used), combination and (new), combination (new), Fuel (new), Center Fuel Tank Level Indicator (new), headset jacks, 11 circuit breakers (new).

Interior

Needs all interior appointments. Seat frames built and strung, but not finished. Confor Foam seat cushions included (CF42 Soft and CF45 Medium in 1" X 16" X 18" and 1" X 18" X 24").

Compass

Precision Aviation PAI-700 - One Vertical Card Magnetic Compass, new.

Vacuum System

Rapco RA215CC - vacuum pump and vacuum regulator, both used.

Headsets

David Clark H10-75 - Two (military version) headsets with adapter connectors.

Wing Jacks

Two wing jacks included.

Interior & Exterior

Exterior Notes: Airframe 98+ percent complete. Needs exterior fit and finish. All flying surfaces complete with close fitting glass covered fairings on the leading edges. All surfaces mounted with hinges containing oilite bronze bearings. Aileron, rudder, and elevator deflections correct. Trailing edges of wing and fin glass covered per plans. Cowl not included (available from Nathan Peck).