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Ziroli P-47 92"

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Old 06-22-2018, 07:19 AM
  #26  
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Originally Posted by SIMCO View Post
dual servos-one for each half. cheap insurance
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...
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Old 06-22-2018, 07:49 AM
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Put the servos forward and run sullivan 4/40 flex rod. Fuse is fat enough!
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Old 06-22-2018, 11:53 AM
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Originally Posted by SIMCO View Post
Put the servos forward and run sullivan 4/40 flex rod. Fuse is fat enough!
Yep, that is an option. Definitely one to consider. Trying to keep it SIMPLE!
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Old 06-22-2018, 02:42 PM
  #29  
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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.
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Old 06-25-2018, 06:59 AM
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Originally Posted by SIMCO View Post
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.
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!
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Old 07-02-2018, 08:03 PM
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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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Old 07-02-2018, 08:05 PM
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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.


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Old 07-02-2018, 08:07 PM
  #33  
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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).



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Old 07-02-2018, 08:48 PM
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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!
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Old 07-22-2018, 06:12 PM
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Some progress on the tail. Elevator linkage completely concealed. Both elevator and rudder linkage are fairly close to scale.

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Old 07-23-2018, 03:31 AM
  #36  
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Really nice work-keep up the good work and thanks for taking the time to post the pics-
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Old 07-30-2018, 05:32 AM
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Slow progress. The fiberglass "razorback" and tail sections are loosely in place... just had to see how they looked.


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Old 08-06-2018, 05:52 AM
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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.

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Old 08-21-2018, 12:37 PM
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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.



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Old 08-24-2018, 03:51 PM
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Nice work brother! Keep postin!
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