I am curious how many planes Piper and Diamond are now selling because of Jet-A instead of losing the sale to Cirrus.
Tim
Doubt it. Cessna and Piper both have tried the diesel and failed. As long as 100LL is available in the major market nobody is willing to pay more to get less performance and have an unknown engine.
Piper has not given up on the diesel. It still offers both training and personal Continental CD-155 diesel powered versions of the Archer and, although not available for purchase, it's been playing around with a diesel variant of the Seminole trainer.
Apparently it only sold an average of 2 diesel Archers per year from introduction in 2015 through 2018, but moved 6 of them in 2019. The diesel Archer is done on an FAA STC, but Piper brought that production in house last year. It is now marketing the plane aggressively to airline funded fleet training programs (although I note Lufthansa replaced its aging Bonanzas with Cirrus).
The biggest problem with both the Piper and Diamond diesels is what I have posted about several times before. They are damned expensive engines to keep in the air compared to their avgas equivalents because the accessory life limits and actual operating failure rates are still quite poor. The shop that oversees keeping my Husky airworthy is also the Diamond service center in my region. They maintain several Thielert and Austro powered DA-42s. Although the core engine block and internals seem to be very robust, everything bolted on to it needs to constantly be replaced and their mechanics are finding these automotive accessories just aren't up to aircraft service. Fuel injection pumps, alternators, voltage regulators, vibration dampers, gearboxes, accessory belts, and now even the fuel injection nozzles aren't making service limits on most of the planes.
The Continental CD-155 (essentially a refined Thielert) isn't much different. An excerpt from an article on the Piper diesel from about a year ago:
"...Continental has been able to increase the time between removal of the CD-155 to 2,100 hours. At that point, the engine must be replaced. There are interim maintenance requirements and many items with life limits. These include the gearbox clutch and high-pressure pump every 300 hours, the alternators every 600 hours, friction disk every 900 hours, v-ribbed belt every 1,200 hours, alternator excitation battery every 12 months, and all fuel, oil, and cooling lines every 60 months. The propeller is limited to 2,400 hours or 72 months, and the governor and accumulators to 2,000 hours or 72 months.."
I wonder if the cost of keeping the engines and props going on these diesel airplanes may be more than the savings from the difference in fuel costs?