Overview

The Riley Super P210, marketed as the Riley Rocket, is an aftermarket conversion of the Cessna P210N Pressurised Centurion developed by Jack Riley’s Riley International Corporation in the late 1980s. Riley took a used pressurised Centurion, fitted a factory-overhauled 310 hp Continental TSIO-520 with a Riley-built intercooler, added new baffling, auxiliary fuel, soundproofing, a metal panel, and fresh avionics, and delivered a born-again airplane positioned as a less expensive alternative to a new Piper Malibu. The base airframe is the only single-engine pressurised aircraft Cessna built in volume: a six-seat, high-wing, retractable-gear single produced from 1978 to 1986.

The pressurisation is the point. The P210 lets you cruise in the high teens and low twenties without strapping the whole cabin into oxygen masks, which is what separates it from the unpressurised T210 on the same airframe. Riley’s intercooler then chases the other half of the equation: cooler induction air for lower operating temperatures, higher critical altitude, and book P210N cruise speeds at lower fuel burn, or genuine speed gains when run hard. In Riley’s own demonstration the converted aircraft showed 205 to 222 KTAS depending on power setting. It suits a buyer who wants pressurised, high-altitude single-engine cruise without stepping up to a Malibu or a cabin-class twin, and who can support a low-volume STC conversion with a shop that knows the type.

Key Features for GA Buyers

• Pressurised comfort in a single. A modest pressure differential keeps the cabin altitude reasonable through the mid-twenties, so long high-altitude legs do not demand cannulas and masks for everyone aboard. For an owner who routinely flies above the weather, this is the feature that justifies the type.
• Intercooled performance. The Riley intercooler lowers cylinder and induction temperatures, raises critical altitude, and improves fuel efficiency at a given speed. Run for economy, the conversion returns stock cruise on less fuel; run for speed, it is genuinely quick for a piston single.
• Six-seat cabin and useful load. The P210 airframe carries six and, even with the conversion’s added weight and pressurisation structure, leaves useful load in the 1,250 to 1,575 lb range depending on equipment and aux tanks.
• Long legs with auxiliary fuel. Riley’s optional wing-tip or baggage-bay tanks add meaningful endurance on top of the standard 89 usable gallons, turning the Super P210 into a serious cross-country machine.

Trade-offs

• System complexity, squared. This is a pressurised, turbocharged, retractable-gear, intercooler-modified single. Every one of those systems is a maintenance and inspection burden the simpler 210s never carry. Budget for the highest annuals in the family and a shop that knows the type.
• Conversion parts and STC support. The Riley modification is decades old and was always a low-volume product. Intercooler, baffling, and auxiliary-fuel parts come from a thin supply chain; verify STC paperwork and parts availability before buying. A conversion is only as good as the support behind it.
• Engine management discipline. The turbocharged TSIO-520 demands attentive cylinder-head and turbine-inlet temperature management. The intercooler helps, but shock cooling and abuse still kill cylinders. Borescope the engine and review the temperature history at pre-purchase.
• Pressurisation upkeep. Door and window seals, the outflow and dump valves, and the controller are wear items; a pressurisation that will not hold is both a comfort loss and a repair bill. Confirm the system holds its rated differential on the test flight.
• Shared 210 airframe items. Bladder fuel tanks, hydraulic retractable gear, and the carry-through-spar inspection apply here exactly as on the rest of the family. Inspect all three at pre-buy.

See Also

• Cessna 210 Centurion – the normally aspirated, unpressurised parent airframe; far simpler and cheaper to own, no high-altitude capability. Compare
• Cessna T210 Turbo Centurion – the turbocharged but unpressurised sibling; same altitude reach, but oxygen required for the occupants. Compare
• Beechcraft Bonanza A36 – the six-seat low-wing benchmark; unpressurised and normally aspirated, but simpler and better supported. Compare