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Nice pics Mark, and great to hear about the donation. Will wait for more awesomeness 45 years..... geez, it's older than me... just....
Greetings All -
We recently received a treasure trove of goodies in a donation from a retired McAir engineer - some great F-15 design material that I'll post when I get the chance to scan them.
F-15 Full Scale Mockup Photos
Several photos of the original full scale F-15 model that was on display in the Bldg 002 “Blue Room”.
Pictures: http://postimg.org/gallery/dfl82guc/
Source: http://aviationarchives.blogspot.de/2015/02/f-15-full-scale-mockup-photos.html
As I recall the computer configuration analysis said the diamond delta wing was optimal, and the F-15 wing was refined with good old engineering experience.As the design gelled, you start seeing the genesis to the eventual F-15. The leading edge flap is interesting - the F-102 wing evolved with the change of its fixed leading edge camber which improved its performance both in cruise and in maneuvering. It looks to me that it was taken one step further by making it variable.
The single engine version (Model 199-104) has a lot of Sukhoi Su-15 looks to it...
Enjoy the Day! Mark
Not sure what you mean - go back to #14 in this thread and you can see the decision tree that led to the wing as built. That was refined with a different cropped tip during flight test and at the same time, the horizontal stab got a saw tooth to address loading.What happened to the wing? October '68 it's the contract defintion bid configuration after they spent a year deciding it was the way to go, but by December it's not even in the contract defintion studies.
Not sure what you mean - go back to #14 in this thread and you can see the decision tree that led to the wing as built. That was refined with a different cropped tip during flight test and at the same time, the horizontal stabe got a saw tooth to address loading.What happened to the wing? October '68 it's the contract defintion bid configuration after they spent a year deciding it was the way to go, but by December it's not even in the contract defintion studies.
Enjoy the Day! Mark
Intriguing. They are not folding a lot of wing, it's not like it would let you move the aerodynamic center back to a more forward position in supersonic flight (a la XB-70). Similarly, it's not a whole lot of wing area to accomplish much of anything for other purposes either.
IIRC, there were other studies for in-flight wing tip folding, for some reason i'm picturing a Fairchild or Vought project of the same era or slightly earlier vintage. In that case, i think there was a very visible teardrop-shaped fairing that ran chordwise where the hinge was, and the amount of folding span involved was larger.
As the original is no longer available from NASA -NASA presentation of drag reduction modifications to the F-15 by Bobby Berrier given to Robert Seamans (Sec. of USAF) and Neil Armstrong (Deputy Administrator for Aeronautics)
Extended nozzle for augmentation, much like the nozzles on the F-111?These are the tip fold studies - it was folded in flight for aerodynamic reasons, presumably. Not sure why the nozzle is detached on the second pic though!
Always wondered why the F-111s had the extension (ejector?) but the Tomcats didn't.
Yes, it's basically an ejector. I suspect weight may have been one problem and reaction time to power changes would be another. If you're cruising, it's one thing, but if you need fast nozzle changes for rapid power changes, a convergent-divergent nozzle works better.Always wondered why the F-111s had the extension (ejector?) but the Tomcats didn't.
Always wondered why the F-111s had the extension (ejector?) but the Tomcats didn't.Yes, it's basically an ejector. I suspect weight may have been one problem and reaction time to power changes would be another. If you're cruising, it's one thing, but if you need fast nozzle changes for rapid power changes, a convergent-divergent nozzle works better.Always wondered why the F-111s had the extension (ejector?) but the Tomcats didn't.