Tailhook Topics Drafts

Thursday, March 2, 2017

A-1E Yankee Escape System

The US Air Force installed Stanley's Yankee escape system in its A-1E Skyraiders as well as its single-seat ones. The Navy incorporated it in single-seat Skyraiders in at least two attack squadrons late in their fleet service but not in any of their wide-body A-1s.

From a Stanley Aviation Brochure:

From Ed Barthelmes excellent A-1 Skyraider Walkaround*:

* If you don't have it, you should buy it:

Sunday, January 15, 2017

C-130 Dihedral

In response to a discussion about C-130 wing dihedral:

The outboard wing panel had 2.5 degrees of dihedral, probably measured at the trailing edge.

 Note that this drawing is from a Lockheed C-130 (no revision letter) so it shows an outboard location for the external fuel tank.

As a result, the wing was not flat across the top as shown by the red line in the front view above and by comparison of the airfoils on the side view here, at least statically when there was no fuel load:

Some say that when the airplane was fueled (all of it was in the wing, most in the outboard wing panels) that the wing was flat across the top.

Sunday, January 8, 2017

F4H Aft Fuselage Cross Sections

The shape of the aft part of the engine nacelle of the excellent 1/48th Zoukei-Mura F-4J Phantom has been questioned. For what it's worth to the discussion, this is a depiction of the cross sections from pretty good drawings produced by McAir. Note that it depicts the Blue Angels F-4J, almost all of which had the F-4B J79-8 engines installed. However, the nacelle shape of the F-4B/N/J/S forward of FS 493, i.e. the unpainted "finger plate" surrounding the afterburner nozzle was the same.

For a description of the difference between the F-4B/N and F-4J/S afterburner nozzles and their respective "finger plates", see http://tailspintopics.blogspot.com/2012/12/j79-exhaust-nozzles.html

Wednesday, December 7, 2016

Vought F6U Pirate Trivia

The F6U catapult hook mechanism (and hold back, not shown), located aft of the nose-landing-gear well, was retractable and covered by two access doors.
One of many changes during the Pirate's development was to add a link/case chute on the belly, directly under the catapult mechanism location, to channel the links and cases from two of the cannons aft, safely past the engine intakes.

So what happened to the catapult mechanism or its access? After more closely examining a picture of the F6U bailed to NACA up on jacks and a closeup picture of the chute itself, I realized that there were actually two side-by-side chutes, each mounted on one of the catapult access doors.

For more on the F6U and the Admiral kit: http://tailspintopics.blogspot.com/2013/03/vought-f6u-pirate.html

Monday, November 28, 2016

XF-92 Main Landing Gear Actuator

Photobucket is fighting me today so I'm posting this picture here for an answer to an XF-92 question on Britmodeler.
 Annotated Howard Mason Photo

The landing gear actuator is at the aft end of the wheel well. There are other pictures of it here:

It acts on a bellcrank that rotates the landing gear up and down. Note that the actuator is fully retracted when the gear is down so no piston is showing as when an actuator extends to put the landing gear down. Note the slot in the actuator end fitting that is connected to the bellcrank for the latter to slide inside it as actuator extends fully as the gear retracts. In other pictures on the link you'll also note that the hydraulic lines are missing but the requisite hydraulic fittings are on the actuator.

Wednesday, November 23, 2016

Douglas Flight Test Logo

And on an XF4D overlaid on what appears to be a black circle based on a very tiny color image:

Tuesday, November 22, 2016

Grumman F7F Tigercat Variations

Annotated scan of the profiles in Squadron/Signal Publications Aircraft No 79, F7F Tigercat in Action: