F-35 design changed?

Discuss the F-35 Lightning II
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eloise

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Unread post15 Jul 2015, 16:33

Is it just me or it look like the body of F-35 being changed significantly?
the body was like a cylinder before, but now it look like they fatten it? ( look at the part near the refueling port)
before :
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now :
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mikemag

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Unread post15 Jul 2015, 16:53

I think it's different lighting effects. More lighting in the top picture makes the curves stand out.
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Jon

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Unread post15 Jul 2015, 17:24

mikemag wrote:I think it's different lighting effects. More lighting in the top picture makes the curves stand out.


Absolutely. Although there are differences, the overall structure has not changed. This is a lighting issue. Also makes a difference which way it's facing. See how the gun housing mound lights differently in each photo. Makes for asymmetric look.
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archeman

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Unread post15 Jul 2015, 17:47

mikemag wrote:I think it's different lighting effects. More lighting in the top picture makes the curves stand out.


Lighting for sure. Sometimes, the cannon housing looks enormous and unnaturally shaped, like they snuck a 30mm in without anyone noticing.
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SpudmanWP

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Unread post15 Jul 2015, 18:36

The first photo is of AA-1 (IPP exhausting upwards) which is before SWAT, so yes there was a redesign between photo 1 and 2.
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eloise

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Unread post16 Jul 2015, 05:54

SpudmanWP wrote:The first photo is of AA-1 (IPP exhausting upwards) which is before SWAT, so yes there was a redesign between photo 1 and 2.

so did they flatten the body? ,
i dont think it is a lighting issue though, the body look very flatten here as well, also the cannon part look so much bigger than i expected
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vs
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new :
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vs old :
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eloise

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Unread post16 Jul 2015, 06:02

Can anyone posted the list of what changed before and after weight reduction measures?
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Unread post16 Jul 2015, 06:54

I do not know if anyone has a 'list' however this Nov 2006 article may be useful?
Weight Watchers How a team of engineers and a crash diet saved the Joint Strike Fighter.
Nov 2006 Joe Pappalardo | Air & Space Magazine

"...In October 2004, the Defense Acquisition Board signed off on more than 500 recommendations, officially making the STOVL weight loss attack team a success.

In eight months, the Lockheed engineers cut a total of 2,700 pounds from the F-35B. The effort also trimmed 1,300 pounds from the other variants. Comfortable with that legacy, SWAT faded, with accolades, into company history, but an estimated 20 ideas a week still turn up in the Weight Improvement Program office...."

Source: http://www.airspacemag.com/military-avi ... chers.html
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stobiewan

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Unread post16 Jul 2015, 11:20

So, the negative impact on the the rest of the aircraft for STOVL was ...ditching 1200 lbs! Deeesaster... :P
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yeswepromise

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Unread post17 Jul 2015, 00:46

CTOLs... you'll notice a lot of differences between AA-1, AF-01, and... AF-71 for example.
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SpudmanWP

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Unread post17 Jul 2015, 02:47

AF-1 through AF-71 are identical (OML wise) for all intents and purposes.
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yeswepromise

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Unread post17 Jul 2015, 17:47

I guess I was pointing out things like AA1's IPP and slime strips on the wings as example.

Just looking at the panels around the upper middle wing area will show differences too.
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SpudmanWP

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Unread post17 Jul 2015, 18:48

The panels are the same from AF-1 forward and any visual changes are paint/RAM releated (early ADD aircraft may not have all the RAM & coatings applied).
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pquispea_m5

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Unread post22 Nov 2018, 00:11

I found some differences between old and new F35A. Someone else found more differences on shape?
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quicksilver

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Unread post22 Nov 2018, 05:48

As others above have pointed out/suggested, AA-1 was representative of the pre-swat design. While the post-swat production OML was largely unchanged, there are some subtle differences; the vertical and horizontal tails are the easiest differences to notice. Differences in the fuselage sections (as seen in manufacturing pics) are different too because the design changes were necessarily accompanied by changes in the manufacturing system. And as a reminder, this all occurred well over a decade ago.
Last edited by quicksilver on 22 Nov 2018, 05:56, edited 1 time in total.
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