The simple 764F with the GEnX engines seems relatively easy and it has a lot of positives for it. The current freighter market outside of old frames like A306F and MD-11 is limited to these choices with some notes alongside. I'm just looking at Boeing models, there are new A330F's and also P2F's of A320's & A330's but I am not familiar with them.
757 P2F conversions - most good candidates have been converted, balance too old /high cycle. - basically SOLD OUT
767 P2F conversions - still being converted but the best candidates have been. CV crisis is getting frames released for possible conversion
However, in not many years these conversions will slow down. - LAST CALL
767F - Good business, the lines is running decently. However, CORSIA will come into play 8 years out. - TIME to PLAN
777W P2F conversions - coming soon with slightly light package densities. Huge volume craft, will do well. - Promising but not by Boeing.
777F - Excellent freighter, will continue to sell well, but supply is close to demand at this capability. Freight for long distances. - GOING STRONG
744 P2F - no conversions in a decade - able to buy already converted frames from the desert. - LAST CALL
748F - Great freighter, but the line is closing. - LAST RIGHTS
The current KC-46 is a FAA certified model (before becoming the tanker) 767-2C. It basically has the 787 cockpit with a lot more modern stuff thru out. Start with that model with the 764 wings and gear, the GEnX-2B engines, raising thrust from 62 to 66.5, gaining the higher gear with a 19 ton add to MTOW. Adjust the length to be optimum as a tanker (future RFP's) which would be between the current 165 ft 6 to the 300F length of 180'-3". The larger engines require more tail or a longer arm. Anyway, basically make a 767-3C X tanker or freighter. Certify that model at that size. A stout freighter with 12 tons more payload than the 300F. - TARGETS the retiring MD-11's and B744F and conversions. - Gives the UPS and FedEX a high payload freighter.
Then do a 764F length craft for the 2nd freighter variant. Although primarily positioned as a freighter, the 764 is an excellent size but its range is short and it never took off being offered as such. The 764X would also be a very good E-4B replacement and as it came from the -2C would take far less certification and has air refueling capability. - GREAT PACKAGE FREIGHTER by volume almost a 777F, but a lot less cost and it fits the current hub stations.
The big bonus is in around 5 year the Air Force will go for the 2nd batch of freighters, if Boeing gets their ass in gear and finally get the KC-46 to be successfully in service, the Air Force would really like this larger capacity tanker, imagine 15 more tons of fuel to deliver or to stay on station with.
Personally, this seems to be a far better program than the 778. But it will only generate 300 or so sales in total. Well, freighters may be an easier sale than passenger widebodies.https://www.aviationbusinessnews.com/ca ... reighters/