Twin-Engine Piston

The light piston twin is a smaller market than it was, and understanding why is more useful than any spec comparison. Modern single-engine turboprops took the missions that used to demand two engines, and did it with turbine reliability and one engine to maintain.

What remains is a genuinely capable category at prices that look extraordinary next to a new single. A well-kept Baron or Seneca offers six seats, real payload, known ice on many, and 200 knots, for less than a new four-seat piston single. The catch is entirely in the running.

What the second engine actually buys

Not a guaranteed climb. A light piston twin with one engine failed, at weight, on a warm day, has very little climb performance and sometimes none. What the second engine reliably buys is options and time — the ability to keep flying toward an airport you choose rather than landing straight ahead.

That is worth a great deal over water, over mountains, or at night. It is worth much less over the Midwest in daylight, which is where most owner-pilots actually fly.

The costs that are not proportional

• ·Two engines to overhaul, two propellers, two of every accessory and AD
• ·Fuel burn commonly two to three times a comparable single
• ·Insurance substantially higher, with training conditions attached
• ·A bigger hangar, and higher handling fees at many fields
• ·An annual that takes longer and finds more, because there is more to find

Budget roughly two to three times a comparable single, all in. That is not an argument against the category — it is the price of what it does, and for the right mission it is money well spent.