tgking44

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Thanks SIMCO. I've thought about a dual servo setup in the tail... something I'm accustomed to doing with my large aerobatic birds. To your point about insurance, that's definitely the safest route. BUT, I don't want the weight of two servos that far back and I was really trying to make it as scale as possible - no visible linkages outside the airplane. Still looking at all options...

SIMCO

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Put the servos forward and run sullivan 4/40 flex rod. Fuse is fat enough!

tgking44

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Yep, that is an option. Definitely one to consider. Trying to keep it SIMPLE!

SIMCO

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You really dont need much throw for warbird maneuvers. And a lower in/oz servo can be used. I personally build most of my birds with hi tec 625mg. More than plenty power more money for other pieces.

tgking44

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Yes, I agree SIMCO. I've been using Hitec's 645 & 625's for years. Great servos. I'll be using several of them in this one!

tgking44

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Structure of the stab and elevator almost complete. Already skinned one side of the elevator halves. Note the scale location of hinge line.




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tgking44

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Also followed Ziroli's recommendation of the making the elevator coupler out of 1/4" music wire. Fabricated a servo arm and silver soldered it to the wire. The brass tubing was installed as a hinge for the wire to rotate in. All this was looking good and worked great until I tested the servo arm with some force. The silver solder failed (and yes, I know how to correctly silver solder). I used a lot of force in the tests - probably more than the elevators would ever endure, but I just didn't have a good feeling about the soldered joint.

tgking44

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So... I fabricated a new elevator coupler. This one is made out of carbon fiber tubes and a Nelson Hobbies control horn. Very similar to what CARF Models uses in their P-47. It passed all of my exaggerated tests and is 1/3 the weight of the 1/4" wire. It may look silly and overkill, but my gut tells me it'll work (hope I'm right).

SIMCO

My Feedback: (33)

Servo's probably will beat themselves to death if they aren't matched for speed and exact power curve. These airplanes flew and fly fine on 40 oz. power servos. I have his old plans with servos as big as a house. really no need to go overboard. But that's my personal 2 bits!

tgking44

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Some progress on the tail. Elevator linkage completely concealed. Both elevator and rudder linkage are fairly close to scale.

IFLYBVM2

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Really nice work-keep up the good work and thanks for taking the time to post the pics-

tgking44

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Slow progress. The fiberglass "razorback" and tail sections are loosely in place... just had to see how they looked.

tgking44

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Did some more planking and A LOT of sanding over the weekend. For access to install the sliding canopy hardware, the area in front of the cockpit was left open. I'll fill in that area last.

tgking44

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Installed 2 linear servos for the sliding canopy. With 6" of travel, they're ideal for this application. Required some tinkering to get the geometry right, but I'm happy with how it turned out. It works great.

Empennage Gunner

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Nice work brother! Keep postin!

tgking44

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A few pics to update. Slow, but steady progress. Closed up most of the fuse, but had to install the cockpit floor first. The rest of the cockpit walls and details will be added later... just the floor had to be installed before I closed up around it. Also made further progress on the removable firewall. The concept is to have a "system" that includes the engine box, firewall, tank and all electronics in one self contained, removable piece.

tgking44

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With 2deg of down and right thrust at prop shaft, loose fitting of front-end pieces shows perfect alignment. Makes me giddy...

Half of the time spent on the fuse is ensuring everything aligns and pre-planning part fab and building steps. It's a good feeling when it all comes together.

Now on to engine baffling and the Hysol glue...

tgking44

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Ok... decided to keep just one post updated. If interested, it can be found here

Glenn

tgking44

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Hey guys, finally got this one finished. Here's a shot of where I am now with her. I pick up where I left off and finished the thread here.

Empennage Gunner

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Wonderful looking warbird brother! Great job on getting her built/done. I know the time is hard to come by however it looks fantastic! ~ Keep U'M Flying!