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LOCKHEED P-38J “LIGHTNING”. A giant 1/4 scale scratch built model

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LOCKHEED P-38J “LIGHTNING”. A giant 1/4 scale scratch built model

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Old 07-20-2018, 08:27 PM
  #26  
Chad Veich
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You may find the thread below interesting if you are not aware of it already.

https://www.rcscalebuilder.com/forum...TID=23228&PN=1
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Old 07-24-2018, 08:59 AM
  #27  
fbielsa
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Originally Posted by Chad Veich View Post
You may find the thread below interesting if you are not aware of it already.

https://www.rcscalebuilder.com/forum/forum_posts.asp?TID=23228&PN=1
Thanks Chad for the link. It looks really great. Mine is only 4'' smaller but is the longer I can carry in my van. I know my limits. The work is awesome. Congratulations.
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Old 07-24-2018, 09:08 AM
  #28  
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Estabilizer
It should be built before the main fuselages, as it is a fundamental piece to ensure a perfect settlement of these on the assembly of the gondola and central wing. It is a light structure of main stringers in samba, with ribs and sheeting of 2 mm.

The symmetrical profile has been provided with a thickness of 10%, in order to locate the two servos of the elevator lying in its interior and obtain a direct control without gaps by not having to manipulate the links in the assembly.

The hinges have been made with 2 mm aeronautical ply attached to the ribs of the fixed part, crossed by a 1.5 mm steel rod shaft. This axle runs through the interior of a Sullivan Gold-N-Rod® yellow polygonal transmission that fits into the moving part. If another type of more conventional hinges is preferred, the plane will have to be reinforced conveniently. With this choice, I can disassemble the elevator easily by removing the rod from the side.

The fixation to the fuselages has been solved with four beech dowels and two M4 self-powered nuts.

Last edited by fbielsa; 07-24-2018 at 09:26 AM.
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Old 07-26-2018, 07:18 AM
  #29  
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Some pics of the progress and the size ratio about to start the fuselages. Inner Fowler flap travel..
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Old 07-30-2018, 06:24 AM
  #30  
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Fuselages
As both fuselages are almost identical, I also recommend building them simultaneously.

In this case, two mounting boards are required, about 250 x 40 cm (100''x18''), and caution to clearly differentiate the right and the left when applying the reinforcements of the wing seats, the benches of the landing gear, the engine and the seats of the horizontal stabilizer, that go to mirror in each one of them. Take care with the difference in the lateral incidence of the normal rotation engines for the construction of their benches: left at 0 degrees, right at 2 degrees on the right (in the case of using a counter-rotating engine on the right side, the two benches should go to 0 degrees). Both engines are set with 4 degrees of positive incidence, with respect to the horizontal of the fuselage assembly crutch.

Here we go with them..
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Old 08-02-2018, 02:48 AM
  #31  
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The assembly is similar to that of the central nacelle, that is, on a crutch based on samba stringers in which the 3 mm ply formers (1/8'') and their 3 x 7 mm samba spars are applied. It does not present a special complication, except in the gluing of all the reinforcements that make up the wing seat, and in the positioning of the formerss inclined 5 degrees with respect to the horizontal of the crutch (at 90 degrees with respect to the upper line of the fuselage). For information purposes, the wing at this point has a positive incidence of about 7 degrees with respect to the mains spars of the crutch.


General view of the crutch


Engine and main landing gear bench



Reinforcements for receiving stabilizer
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Old 08-02-2018, 10:09 AM
  #32  
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I would love to build one of these. where did you get plans? did you hand cut your kit or get some of the parts cut?
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Old 08-07-2018, 08:33 AM
  #33  
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Originally Posted by Constrictor View Post
I would love to build one of these. where did you get plans? did you hand cut your kit or get some of the parts cut?
Hello Constrictor:

The plans are self-drawn using a CAD app. This process took me 6 months, So, it is not a comercial kit but a scratch buid project. Fortunately, I had the chance to cut all the ribs and frames with a CNC milling machine in a friend's workshop.

Keep in mind that there are more than 300 pieces. A lot of work to do it by hand.
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Old 08-07-2018, 08:52 AM
  #34  
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Following with the fuses...some pics of several steps of the process.

Note that there is no difference with the way you build any classic fuselage, but the size and perfection of the alignments make the task enormously difficult.



The crutch ready to receive formers and stringers


Gluing the wing base reinforcements


More and more stringers. This time gluing the gear doors ones


One fuselage ready to be sheeted

As I said in a post above, I recommend building both fuselages at the same time, in two different workbenches. You will save a significant amount of time
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Old 08-08-2018, 03:21 PM
  #35  
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Looking good!
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Old 08-09-2018, 09:34 AM
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Originally Posted by 70 ragtop View Post
Looking good!
Thank you for being there! I am on summer holidays but hope to follow posting soon.
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