This is the second in a series of topics that will be revisited now that the Eclipse is certified and deliveries are about to commence.
The Eclipse web site is still showing the numbers released July 27th:
Max T.O. Weight 5,920 lbs
Fuel 1,686 lbs
The Type Data Sheet lists:
Max T.O. Weight 5,760 lbs
Fuel 1,524 lbs
These reductions shift the range-payload curve to the left and almost certainly reduce the published range figure to under 1,000 nm.
Until the company starts delivering airplanes, the true empty weight will remain a closely guarded secret. Somehow we will need to get Duke a leave from Bush's Bean Factory and have him infiltrate the Albuquerque airplane company. I am confident Duke could get us the actual numbers.
(editors note: Imagine the off-shore readers trying to figure out the Duke business!)
Back on subject, the range is predicated on empty weight and current numbers reflect a 3,550 lb airframe, a number I suspect is still not based on reality.
Now I will go out on some thin ice. Using the information I have available, the Type Data Sheet and a 3-view diagram from Jane's, I did some quick and dirty center of gravity calculations.
If the empty aircraft CG is at station 208, a single 170 lb pilot with minimum (300 lbs) fuel on board will push the aft CG limit.
If the same airplane is loaded with full fuel and 4 - 170 lb occupants in the four front seats, the airplane will be at gross and outside the forward limit.
The Eclipse does not have a large CG envelope. It is a short coupled airplane - the distance between the horizontal tail and wing, which ultimately limits CG travel.
The four front seats are all forward of the approved envelope. Occupants in the pilot seats weighing more than 170 lbs will really shift the CG location due to the long moment arm. Since most adults weigh more than 170 lbs, in addition to providing the hand held GPS with each delivery, Vern may also want to provide a bathroom scale with each airplane to ensure the weights and CG limits are not exceeded.
So Duke, while you are at it, get us a CG location as well.