Stitch wrote:RJMAZ wrote:Most 787-9 specific parts are not lighter, they are stronger and heavier.
The 787-9 did undergo a significant optimization of the weight of many of it's components which resulted in an overall reduction in the aircraft's empty weight. The 787-8 started incorporating many of those weight-optimized parts, as well, and I have heard at full benefit this shed about 4,000kg off the Basic Empty Weight of the 787-8.
That being said, there are of course parts on the 787-9 and 787-10 designed specifically to support the higher Operating Weights of those two frames and in many cases they will weigh more than those used on the 787-8.
As the -10 is now certified the design team can collect their thoughts, then do a pass back review on both the -9 and -8. One item like that is the -10 vertical stabilizer was able to use a program change to continue the -8 part still work on the -10. http://www.aviationfigure.com/how-an-in ... reamliner/.
I am sure there are lots of parts that were optimized from the -8 going into the -9 that are away from the critical structural paths. A fill in job until the next program launch.