APRIL/MAY CAF Red Tail Squadron s Tuskegee Airmen P-51C Monthly Update by Chuck Cravens

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1 April/May-2016 APRIL/MAY CAF Red Tail Squadron s Tuskegee Airmen P-51C Monthly Update by Chuck Cravens This is a front view of fuselage in the fixture inside the restoration shop working area.

2 April/May CAF Red Tail Squadron s Tuskegee Airmen P-51C Update Robert Heinlein once said A generation which ignores history has no past and no future. This wisdom appears as part of the Commemorative Air Forces mission statement. Heinlein s observation very neatly sums up the reason for the CAF Red Tail Squadron s Rise Above traveling exhibit and the P-51C Tuskegee Airmen s appearances at air shows throughout the country. In the shop now, the fuselage in the fixture as new tail cone skin is clecoed on to check fit. Education is the goal, education about the legacy of the Tuskegee Airmen, not only their stellar combat record, but even more importantly the triumph over adversity that made that record possible. It is this triumph that can inspire others, especially young people, to rise above the obstacles that stand in the way of their goals and dreams. That is why it is so very important that the Tuskegee Airmen P-51C continues to tour. An obstacle fell across its path this February when some damage occurred to the Mustang. The CAF Red Tail Squadron decided to invest the time and resources to bring Tuskegee Airmen back to airworthiness. They entrusted AirCorps Aviation with the job and the repairs have progressed nicely so far. New lower rear fuselage skin has been riveted in place and repaired side skin is visible in this shot. By late April the inspections had been completed and repairs commenced. This is a front view of fuselage in the fixture just before bringing it into the restoration shop working area. Here is a rear view of a replaced fuselage rib. AIRCORPS AVIATION 2

3 Undamaged access door opening that is just in front of the new skin. COOLING AIR INTAKE AND EXIT AREA Next work began on the very complicated cooling air intake and exit area so characteristic of a Mustang. The forward exit duct frame as it is being straightened. AIRCORPS AVIATION 3

4 April/May-2016 Assembled exit duct frames and shown after straightening and reassembly. The exit duct is coming back together permanently. Checking inner skin fit inside exit duct before assembly. Simon is reassembling tail cone components. Checking outer skin fit on the exit duct. Brian is working on the inside of the exit duct. AIRCORPS AVIATION 4

5 Brian is reaching back, riveting the exit duct on. RIVETS If you look very carefully in the image above you will notice three rivet colors. Like most large operations, North American sourced rivets and other parts from various subcontractors. The rivets came in three variations of anodized color. There were clear anodized natural aluminum rivets, iridite anodized rivets with a yellow cast to them and occasionally a blue anodized rivet. While unproven, it is speculated that the blue ones may have been to a navy spec and were used because they were available and in the rivet bins. 1 A view of the exit duct area in place and being permanently riveted in place. New rivets were specially produced to the 1944 specifications by National Rivet and Manufacturing of Waupun, Wisconsin and used throughout the restoration of Sierra Sue II and now in the repair of the Red Tail. 1 Chuck Cravens, Combat Vet P51, the History of Sierra Sue II, (Edina, MN, Beaver s Pond Press, 2015) Oxygen bottle area, sometimes known by crew as the hellhole because of how cramped and difficult it could be to work in there. AIRCORPS AVIATION 5

6 DOGHOUSE This view is looking forward from the rear of the oxygen bottle area. Rear view of new doghouse, this surface mates to the front side of the radiator. Replacement propeller blades for the Red Tail, are in stock and ready to be overhauled. Front side of the doghouse. Here is the exit duct with the radiator mount in place. In the photo, the elongated oval shaped opening is where cooling air exits the oil cooler which will mount directly in front of that opening in the space shown. The opening above the oil cooling duct (to the left in the photo) is for radiator cooling air. AIRCORPS AVIATION 6

7 Dan and Steve use a template to ensure the fit of the doghouse will be correct. This side of the doghouse mates to the radiator. The radiator air duct expands in cross section to slow the cooling air before it reaches the radiator. This allows the air to move through the radiator more slowly to cool better. After it leaves the radiator, the exit duct narrows down to accelerate the air again as it leaves the air duct. Mark working on fitting the doghouse. Two sets of hands are better than one sometimes. Randy works with Mark. The rebuild of the exit door begins. AIRCORPS AVIATION 7

8 Randy assembling exit door in a fixture. Rudder in fresh epoxy, ready to cover. Exit door nearly ready for final riveting. Flap control assembly bearings in the paint booth. AIRCORPS AVIATION 8

9 Flap control assembly bearings in the paint booth. Flap actuator torque rod, rudder, and various castings fresh out of the paint booth. The parts with two and three large cylinders in the photo on the right are engine mount castings that will have the Lord mount vibration isolators installed before use. Repaired engine mount beam assembly ready for skin at Odegaard Wings. A view of repaired engine mount beam assembly from the other side. The doghouse has to be put on and off many times before finally permanently installing it. It is a complicated job to fit all the pieces and make the whole assembly function properly. Front side of the radiator, this radiator is one just being used to ensure the fit in the mounts is correct. The tube with bell cranks in the upper left is the flap actuator tube assembly. Inner skin of the cooling air exit door. AIRCORPS AVIATION 9

10 In the area is the hydraulic wing flap and air scoop control valve assembly, shown here left edge center, the natural aluminum casting with hydraulic connections. Randy carefully assembling the exit door. The oxygen bottle is installed. A better view of the flap actuator torque tube assembly. Hydraulic flap actuator strut assembly. A bottom view of the doghouse showing the oil cooler door (painted trapezoidal shape). AIRCORPS AVIATION 10

11 The assembly is being test fitted here. Left side It is always amazing how many times assemblies go on and off before permanent installation. After all the fitting work, the doghouse will come off one more time when the scoop is installed. For the upcoming month, we will look forward to receiving the completed engine mounts from Odegaard Wings so we can install them. Here is the view through the air duct to the radiator face. Several upper cowling formers and the right side upper and side of cowling skins are usable as is. For the rest, some parts will be fabricated and some are available for purchase and will be ordered. (If another qualified restoration shop has done the tooling and made a particular part, it is much more economical to buy that part than to start from scratch and tool up and make it.) By the end of the month we hope to be ready to install the Merlin when it comes back from Roush Aviation. Another shot of the right side of the doghouse. AIRCORPS AVIATION 11