Beyond The Sprues

Modelling => Ideas & Inspiration => Engineering Dept. => Topic started by: kengeorge on December 08, 2019, 08:29:30 AM

Title: Rolls-Royce LiftSystem
Post by: kengeorge on December 08, 2019, 08:29:30 AM
Hi to all the well informed members of this esteemed forum, perhaps you could answer two questions, what is the weight of the LiftFan used in the F-35's Integrated Lift Fan Propulsion System (ILFPS)? I have a diameter of 50inches (1.3m), and what is the overall height?

Thanks in advance
Ken
Title: Re: Rolls-Royce LiftSystem
Post by: GTX_Admin on December 09, 2019, 02:27:19 AM
Supposedly 2700lb (~1225kg) - see here (https://web.archive.org/web/20140413144014/http://www.aviationweek.com/Blogs.aspx?plckBlogId=Blog:a68cb417-3364-4fbf-a9dd-4feda680ec9c&plckPostId=Blog:a68cb417-3364-4fbf-a9dd-4feda680ec9cPost:3cb0d3a7-41e6-47eb-9591-1bd43742a6b2)
Title: Re: Rolls-Royce LiftSystem
Post by: kengeorge on December 10, 2019, 05:36:26 AM
Thank you Greg, that's not only informative it's also proved to me that an idea I had isn't going to work.
Title: Re: Rolls-Royce LiftSystem
Post by: GTX_Admin on December 11, 2019, 01:09:52 AM
The idea being?
Title: Re: Rolls-Royce LiftSystem
Post by: kengeorge on December 11, 2019, 06:11:33 AM
The idea for an Airship Aircraft carrier. in my whatif, the RN has bagged all the F-35B's for their carriers.
So what is left to use for an airborne carrier air wing? Re-build some Harrier's, that's what! I needed the dimensions and weight of the LiftFan to  fit in a bay behind the cockpit so it replaced the distilled water tank in the harrier so it could hover longer than the 90 seconds the tank allows, before the engine overtemps.
Now I know that's not a bright idea as harrier's would still need the water injection system regardless wether I stuff a LiftFan in or not. Plus adding little over a ton of deadweight isn't big or clever.
Instead I'll have a plan B and just increase the water tank size to enable my Airship bourne fighters to have a better margin of hover when they return to their flying carrier.
Title: Re: Rolls-Royce LiftSystem
Post by: Rickshaw on December 11, 2019, 10:11:47 AM
The man you want to talk to is, Kit Speckman over at What-if.  He worked on building the machines that built the lift fans for the F-35.
Title: Re: Rolls-Royce LiftSystem
Post by: GTX_Admin on December 12, 2019, 02:19:09 AM
Ah, ok.  I have long had the idea for taking two complete F-35B Lift systems (engine, lift fan, clutch, roll posts (well at least 1 set) and mounting them on a transport fuselage (maybe C-27J sized) - be that in a shoulder position or further ut on wings a bit - and making a high speed, VTOL platform.
Title: Re: Rolls-Royce LiftSystem
Post by: kitnut617 on December 12, 2019, 03:10:25 AM
Quote from: Rickshaw on December 11, 2019, 10:11:47 AM
The man you want to talk to is, Kit Speckman over at What-if.  He worked on building the machines that built the lift fans for the F-35.

Kit Spackman, aka PR19_Kit