The P85 is the result of installing  powerful, light, all aluminum liquid cooled V8 engine technology into the solidly engineered Radial Rocket airframe. We look for this to result in a new and exciting combination of performance, economy, simplicity and utility.

The focus of the P85 is on a simple, relatively low cost V8 firewall forward powerplant option. Toward this end, the P85 cowling has been lofted around the LS series of high performance V8’s.

The engine installed in our first P85 is a 402 CID LS2/LS3 hybrid designed to deliver 400+ HP to the prop at a reasonable 5000 crankshaft RPM. A 1.8:1 ratio PSRU (prop speed reduction unit) reduces prop rpm to 2800 max. This rugged, single mesh gearbox drives a Catto 3 blade, 80 inch diameter fixed pitch propeller – simple, light, and much less expensive when compared with a constant speed set up.

Also contributing to our goal of simplicity is single-lever power management – no mixture or prop controls to manage, thanks to electronic fuel injection controlled via an ECU.

P85 Specifications

Seating / Two, Tandem
Engine / V8, Liquid Cooled, 402 cid, 400+ Horsepower
Prop / Catto, 3 Blade, Fixed Pitch 80 In. Diam.
Wingspan / 26.8 Ft.
Length / 22.2 Ft.
Cockpit Width / 34 In. Pilot, 30 In. Copilot
Wing Area / 93.9 Sq. Ft.
Empty Weight / 1675 Lbs.
Gross Weight / 2475 Lbs.
Useful Load / 800 Lbs.
Baggage Capacity / 12 Cu. Ft.
Fuel Capacity / 65 Gals.

Vmax @ 7500 ft MSL / 283 Mph
Cruise, High Speed / 252 Mph
Cruise, Economy / 220 Mph
Range, Econ. Cruise, 30 Min. Reserve / 1000+ sm
Climb / 3200+ Fpm Solo, 2000+ Fpm Gross
Vso, Stall, Flaps Down / 70 Mph (61 Kts)
Vs1, Stall, Flaps Up / 85 Mph (74 Kts)
Vne, Never Exceed Speed / 290 mph

Swept wingtips, an updated vertical fin shape, and the new cowl shape give the P85 its own distinctive look. Liquid cooling offers the possibility of significantly reduced cooling drag. Improved over the nose visibility is an additional advantage of the new more aerodynamic cowl.  The P85 is offered with the proven tailwheel landing gear configuration of the Radial Rocket TD.

P85 Photo Gallery

Start, Taxi, Flyby Video