Friday, March 14, 2008

D-Jet Gets Bigger Engine

Diamond announced yesterday that their upcoming single engine jet will be upgraded from the FJ33-4A-15 to FJ33-19. This will increase thrust from 1,564 lbs to 1,900-lbs.

This larger engine is the same Williams engine planned for the Cirrus Jet.

Rumors have been circulating for awhile that the -15 engine was too small for the plane.

The problem with both of these single engine jets is that they are limited by certification to 25,000'. At 25,000' the fuel burn will likely be 400-500 lbs / hour. In contrast, a Mustang or P100 at 41,000' will burn only 10-15% more fuel. For that you get two engines, less weather and more redundancy in all systems.

Both SEJs also have less efficient engine configurations that the traditional pylon mount on the tail. The D-Jet has two narrow intakes which will cause some turbulence and inlet drag. The Cirrus Jet engine is vectored so both intake and exhaust are angled.

These two single engine jets certainly have lower acquisition costs than a Mustang or P100, but their fuel burn and therefore fuel cost, will be very similar to the twins.

1 comment:

Brad said...

As a result of the engine change, the initial deliveries will be pushed from the last quarter of 2008 to the second quarter of 2009. In addition, there will be a price change, so the early position holders have just made a premium.