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New CARF P-51D Project

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Old 08-20-2019, 01:39 PM
  #126  
Chris Nicastro
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After some time away on other projects for my friend I’m back on the Mustang!
More photos coming soon.

Update
I had to redo the tail gear installation and rethink the radio and equipment location. That was a set back but it will be the right way to go forward. The Sierra gear was originally mounted to optimize the space ahead of the gear so I could get the radio and equipment in a good location far aft for CG help.
This proved to be a problem for two reasons. The tail was too low to the ground and the the gear was going to be a problem to set up for steering. Instead I installed a plywood plate just behind the radiator exhaust and mounted the gear there with countersink hex screws from the outside of the fuse. They will blend in and be painted over with the invasion stripes later.
Now the tail is as high as possible and more scale like, done.
Tail gear steering servo is now located in front of the bulkhead I installed before with pull pull cables, done.

Installed the air duct and the radiator door, done.

Now that leaves the big hatch I cut out of the tail. I located the gear door cylinders with plywood mounts and epoxied them to the fuse. When you need to take off the tail hatch you pop the door ball links and the hatch with doors comes off complete, done.

Installed two small bulkheads to reduce fuselage twist in the tail area ahead of the stab, done. It spans the carbon fiber stringers I installed before so this helps box the section and stabilize it.

Made canopy rails from extruded rectangular brass. One of those details I like about the Mustang are the distinct canopy rails. A model this big should have them too so I patterned them after the real parts. Not a lot of documentation on these so I had to go through a lot of magazines and books to get a decent side view. These are not done yet but the very close to being finished and mounted.

The instrument panel hood has some distinct features like ribs and an edge pad. I added those to the hood as well, done. These were made with bass wood and evercoat body filler, very fine stuff.

Cockpit floor and scale battery/radio tray are next. The plan is to have the Rx/Regulator and UP2 on a panel behind and below the battery/radio tray. More on this later.

The Pilot aluminum fuel cap was installed in the scale position behind the pilot on the left side, done.
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Old 08-22-2019, 01:52 PM
  #127  
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New pics...




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Old 08-22-2019, 01:56 PM
  #128  
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More pics...

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Old 09-18-2019, 01:58 AM
  #129  
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Default Wings Progress

Been making progress on the wings so far...

Air tanks installed
Flap and aileron servos and linkages all checked and finalized, extensions made
Landing gear and air lines with restrictors installed

The gear doors.... let me just say that on this kit these are probably the biggest issue Iíve run into so far. I have sliced and trimmed and twisted and manipulated these parts to get them to fit nicely to the wing. The position relative to the gear is off so you just have to make them work. The outer door is the toughest one to install. The stock pivot with the aluminum tubing was not compatible with the retract gear so I had to cut that out and make my own. Once the gear is in you have to figure out the door pivot geometry with zero reference. Iím at the drag linkages next now that the door is installed in the left wing. More on that later once I figure out the relationship between the gear and the door and the wing.

The clamshell door air cylinder location was also a tough one because of the tight fit. I wanted a more scale position but since the giant wing tube is in from of the wing spar it interferes with the location of the air cylinder. I had to compromise. I used a Robart 5/8 dis. medium sized air cylinder but I had to make an internal stroke limiter. I used brass tubing cut to about 27mm to remove the excess travel internally. This way I didnít reduce the internal volume too much. Now the doors will have nice large and powerful air cylinders to keep the big







doors from opening in flight.
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Old 09-18-2019, 02:08 AM
  #130  
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Default Gear check

Standing on its own gear for the first time I checked the mains to see if I got it right. So far everything looks great! The wheels are in the right position from the side and they are square to the ground. They are slightly forward by a quarter inch maybe if anything but thatís fine because the plane will handle better and resist nose overs a little better.

The tail retract compression spring is totally inadequate. Iím going to see about replacing that with a harder spring Iím just concerned about it being too stiff and bouncy.

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Old 09-19-2019, 11:36 PM
  #131  
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This is what you get with the stock kit...
You have to slice the sides of the doors and set the skin by twisting it while itís gluing. So far 3 out of the 4 require this.
Also note the clump of epoxy and aluminum tube the stock hinge is made up of and see it doesnít fit with the recommended retracts.










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Old 09-20-2019, 02:30 AM
  #132  
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Hi Chris, that is the project you need the exhaust stacks?
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Old 09-20-2019, 09:37 AM
  #133  
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Yes this is the one. Also the radio and battery cockpit details. I’ll order them soon.
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Old 09-20-2019, 09:51 AM
  #134  
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Good.
The package is still ready to ship.
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Old 10-08-2019, 03:52 AM
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Good choice of engine :-)

Go on!
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