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Hangar 9 P-47 Thunderbolt ARF
Build Review by Rockin' Rick Part 3
I've rounded up the parts for the retract installation and have found to my dismay that the stinking JR NES-791 (which are recommended by Hangar 9) servos will not work at 6V input. They will only work at the stone age 4.8V voltage, therefore, we're going to use the 995MG servo that has an output torque of 207 oz/in. and doesn't mind 6-7.4V inputs. Once you get the servos fitted, you'll have to tap the pre drilled holes on the retract mount for 4-40 bolts. Be sure to add locktite to the mounting bolts when you install the servos. I also had to build 4 wooden spacers to offset the servo enough to make a perfect in-line connection with the retract connector arm. Spacers are provided with the kit but they weren't tall enough for the proper offset control rod offset. Check the completed retract assembly for good functionality before installing permanently in the wing cavity. I had to do a little sanding work to get the higher profile 995MG servos to fit but it worked out well. That being said, we're done with the wing assembly.
Let's move on to finishing the tail feathers. Be sure to drill a 5/64" hole in the center of the slots for the CA hinges. This will allow the thin CA glue to penetrate sufficiently into the areas for a good bond between the hinge and the control surfaces. We'll tap the aluminum stab tube for 4-40 bolts . If you ever take this assembly apart, ensure that you leave one stab connected and it will be so much easier to relocate and connect the opposite stab. The control linkages and horns are being installed in the last frame. I always use a little thin CA in the holes for the control horn screws to stiffen the balsa underneath. The control linkages have been trimmed to length an threaded for Sullivan 4-40 clevises.
The manual shows the receivers and batteries mounted over the fuel tank in front of the fuse. I guess that's a fine place if you are going to use a lesser powered and lighter engine that I used in this application. I've built a lite ply deck that I've mounted to a couple of balsa stick glued to the frame behind the servo bay. The Futaba R5014DPS receiver was used and it took 10 channels to individualize all the control functions. This is great for me because it make programming a snap with this model. A 4700mah 7.4V Li-Ion Battery was used for the receiver with an MPI regulator providing a constant 6.18V to the servos. A 2350mah 7.4V Li-Ion battery was employed for the engine ignition. No regulator was necessary for the new Evolution 35-GTS engine. Both batteries were mounted on the former at the rear of hatch. This seemed to be the place that I obtained proper balance for the aircraft.
Ok, lets wrap up this build with the canopy installation. I kinda liked this cigar chompin' pilot when I saw him and decided to use him in this plane. Ugly cuss, ain't he? We'll glue him to the cockpit floor with some epoxy. I'm going to screw the canopy on in this one instead of gluing it down. Be sure to stiffen the holes for your screws with thin CA. Balance the aircraft, set all your control surfaces for a nice and easy test flight. That just about does it, don't it?
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