Laser Cut P-38 Build Log

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Laser Cut P-38 Build Log

Postby SteveM » Sun Dec 01, 2013 4:41 pm

I don't normally post my build logs here on the forum, but this is a T&E kit that is on a 3-4 month time limit so this log will track my progress. I won't be sharing with the public any issues that I may find that are related to the laser cut wood, but since the remainder of the kit is unchanged I may mention other issues that arise. If it looks like I'm falling behind schedule please feel free to remind me of my commitment.

First off, a little bit about the laser cut wood since that is what a lot of people are interested in. Since this is an early evaluation the wood doesn't have any printing on it so I have to reference a map of the sheet goods which is actually fairly standard for non-Guillow's models. Production versions should have printed wood. They've combined the 4 sheets of 3/32" wood into 3 sheets that are larger so I can't make a perfect comparison between die-cut and laser-cut wood without computing the density of the wood. However, the laser-cut wood is 111g while the die-cut wood in the kit is 117g so I'd say they are about the same density. My other kit is about 10-12 years old and tips the scales at 173g! The laser-cut wood comes out to 9.0 lbs/cu.ft. (ignoring the minor loss in wood from the laser cutting process).
Image

Laser cut wood can allow you to build faster, but due to needing to carefully check each part for errors my progress is a bit slower. I also don't use CA glue which limits my pace a bit. Here is what I got done in a casual evening over a few hours:
Image


Most of you probably know the ups and downs of laser cutting, but for the rest of you here they are as I understand them:

Advantages:
  • The parts are exactly the right size and shape, ensuring good fit and an accurate build.
  • The parts are easily removed from the wood sheets and without any damage.
  • The laser cutting process requires wood of a fairly consistent density which results in wood that is more suitable for flying models.
  • No crushing of the parts when the dies get dull or the wood is soft.

Disadvantages:
  • Higher cost.
  • The edges of parts are charred which can be unsightly and may inhibit glue bonding.
  • Diffusion of the laser causes cuts that are not always perpendicular, though you may not notice this except on the 3/32" thick parts.

The plan for now is to build for static display with all of the movable parts from the "action plan" as this is probably the most popular way to build the P-38 and should use all of the sheet wood parts.
SteveM
 
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Re: Laser Cut P-38 Build Log

Postby SteveM » Sat Dec 07, 2013 3:39 pm

Here is the current build status. The nacelle and two fuselages are as far along as I can get them before adding the stringers. I'm torn between building the LG before adding the stringers and adding the stringers now and trying not to break them while adding the LG later. At any rate construction on the wing can begin now that I've lengthened my building board to accommodate the lengthy wing plans.

Image
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Re: Laser Cut P-38 Build Log

Postby Arlo DiPasquale » Sat Dec 07, 2013 4:03 pm

Looks Great, can't wait to see more!
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Re: Laser Cut P-38 Build Log

Postby davidchoate » Sat Dec 07, 2013 5:52 pm

looks good. cant wait to see finised. Are you planning on display, or RC?
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Re: Laser Cut P-38 Build Log

Postby SteveM » Sun Dec 08, 2013 10:55 pm

I decided to press on with finishing up the "basic" construction of the nacelle and fuselages before starting on the wings. For me this is where laser cut really starts to shine because the stringer notches <edit for joe>may or may not be</edit for joe> the perfect size and depth unlike what you often get with die cutting.


Image
Last edited by SteveM on Mon Dec 09, 2013 11:53 am, edited 1 time in total.
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Re: Laser Cut P-38 Build Log

Postby davidchoate » Mon Dec 09, 2013 6:29 am

it looks like you sanded off the darkened laser cut stains. It looks like the parts fit very nicely
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Re: Laser Cut P-38 Build Log

Postby joecrouse » Mon Dec 09, 2013 11:08 am

you were supposed to email the evaluations to dale. posting them here becomes misinformation after they correct any issues with the kit.
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Re: Laser Cut P-38 Build Log

Postby SteveM » Mon Dec 09, 2013 11:47 am

joecrouse wrote:you were supposed to email the evaluations to dale. posting them here becomes misinformation after they correct any issues with the kit.


Shucks, I thought I was supposed to mail them to Santa Claus. :lol:

Perhaps you confused my comment about the joys of putting stringers onto laser cut models as an evaluation of an error that I found? I was referring to laser cut models in general and nothing about my comment implies that I did or did not find any issues with the stringer notches of the P-38. It would be like me complaining about the charred edge of parts, that isn't an error but a characteristic of the laser cutting method. Trust me, I'm not going to say anything suggesting that I did or did not find any errors.
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Re: Laser Cut P-38 Build Log

Postby SteveM » Thu Dec 12, 2013 1:37 am

The wings are ready for stringers.

Image
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Re: Laser Cut P-38 Build Log

Postby SteveM » Tue Dec 24, 2013 5:06 pm

The wings are strung with care.

Image


The movable scale evelvator-stabilizer is built and ready for shaping. For U/C this is made from supplied sheet stock so no need to verify those parts. For free flight the area is slightly larger than scale, requiring that I trim some parts (D3 and D4) a bit to be scale. What I did was verify the laser cut parts matched the size needed for free flight before trimming for the scale assembly.

Image
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Re: Laser Cut P-38 Build Log

Postby SteveM » Thu Dec 26, 2013 9:31 pm

The rudder-fins are ready to be shaped.

Image
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Re: Laser Cut P-38 Build Log

Postby SteveM » Mon Jun 09, 2014 12:01 pm

After a slight break I've finally resumed building the P-38. I was going to wait a bit to do rough shaping of the parts, but in the end I'm glad I did it now as I tend to break a few glue joints when doing so. If memory serves me then the next step is to put in all of the movable parts like the LG.

Guillow's P-38-27.jpg
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Re: Laser Cut P-38 Build Log

Postby davidchoate » Mon Jun 09, 2014 3:06 pm

Those Laser Cut Kits are nice.
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Re: Laser Cut P-38 Build Log

Postby scigs30 » Tue Jun 10, 2014 9:34 am

It has been 6 months since I built mine, I was hoping these new kits would be out by now.
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