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1/4.5 T-38C Talon scratch build

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1/4.5 T-38C Talon scratch build

Old 11-20-2020, 07:14 AM
  #151  
invertmast
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Originally Posted by Basspilot View Post
We need updates!!

haha. Bad new, its been pushed down the line for a weeeew bit.


good new. Its now #2 in line for getting back to work on. I’ll be getting started on the fuselage detailing here as soon as i get a few more upgrades/repairs done on another model.
Old 11-20-2020, 06:01 PM
  #152  
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I like the NASA paint:



Old 11-21-2020, 01:53 PM
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Originally Posted by invertmast View Post
haha. Bad new, its been pushed down the line for a weeeew bit.


good new. Its now #2 in line for getting back to work on. I’ll be getting started on the fuselage detailing here as soon as i get a few more upgrades/repairs done on another model.
Nobody likes number 2!!!!!!!!!! Number 1 please!!!!!
Old 12-26-2020, 03:41 AM
  #154  
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hi, you going to make kits? id love to have a single Turbax sized one! Gary
Old 12-26-2020, 11:58 AM
  #155  
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Originally Posted by flyncrazy View Post
hi, you going to make kits? id love to have a single Turbax sized one! Gary

this is nowhere near the size for a single turbax size.
Old 08-02-2021, 05:14 AM
  #156  
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Any more Updates on this Project?
Old 08-02-2021, 05:54 AM
  #157  
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Originally Posted by guapoman2000 View Post
Any more Updates on this Project?
ive gotten other projects out of the way and started making slight progress on this yesterday.

i should have some updates pretty soon.
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Old 08-02-2021, 05:57 AM
  #158  
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Glad to learn and look forward in watching!
Old 10-20-2021, 11:10 AM
  #159  
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Its been awhile, but my 1/4 Beech Starship repairs are more or less complete until i get some more flight time on it… so now its time to make some progress on the T38.

the first tasks were checking the fit or the paper test template for the airex cores and also refining the size of the plastic template that will be used for the carbon fiber skin layers.






Once the paper template were proven to fit, i cut out the airex cores on the laser cutter. I am putting alot of extra CAD time to do things like these laser cut core and fabric layers for future production… if that will be me or some other entity has yet to be decided. Lol






Using the plastic template earlier, the spread tow fabric layers were arranged and outlined in 1/4” masking tape. The CF layers are arranged on the bias to the wingspan to increase torsionally rigidity since the substantial internal structure should more than suffice for the bending loads.






Here are the CF layers after bein cut out. I cut down the center of the masking tape as this allows a very narrow edge of tape to ensure the fabric weave doesn’t get distorted or begin to fray.



Old 10-20-2021, 11:16 AM
  #160  
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Next up was doing the first set of wing skin layups.

I made up a batch of spooge (epoxy, milled fibers and cotton flock) to use to fill in the corners of the molds.

The first layer of glass was then put in place, followed by the CF.






Next up, the airex cores were put in the mold and epoxy was generously brushed in to “prime” the airex.





The inner skin reinforcement layers of CF were then put in around the main landing gear/wing tube structure locations and where the aileron servo mount plate will be.






After all that, the final layer of glass was put on, followed by peel plu, perforated plastic and breather/bleeder fabric. All was placed in the vacuum bag and sucked down to 20” of vacuum.




Old 10-20-2021, 11:50 AM
  #161  
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Very nice, Thomas.

Glad to see you back on the T-38.

Laser cut foam skins look nice


Paul
Old 10-20-2021, 11:59 AM
  #162  
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i am sure the cad work will pay off, if it hasnt already with your 'sanity' working through the layers
Old 10-20-2021, 12:00 PM
  #163  
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Originally Posted by JSF-TC View Post
Very nice, Thomas.

Glad to see you back on the T-38.

Laser cut foam skins look nice


Paul

Thanks Paul! Im lazy, what can i say? LoL

im still trying to figure out how to do the fuselage core pieces.
Old 10-21-2021, 06:23 AM
  #164  
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Awesome. Glad to see the work continue. One of my favorite jets
Old 10-21-2021, 07:58 AM
  #165  
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Originally Posted by patf View Post
i am sure the cad work will pay off, if it hasnt already with your 'sanity' working through the layers
LoL.. That alone makes it worth it! Even with the laser doing more than 1/2 the work for cutting out the glass and core layers, it still takes about 3 hours to just get everything for the actual layup prepped and ready.. that doesn't include any mold prep or spraying the primer coat. so in total, its about 4-5 hours of work just in "prep" then another 3 hours in skin layups... then you still have to do all the internal stuff! There is easily 15-20 hours of labor in just a pair of wings.
Old 10-21-2021, 11:49 AM
  #166  
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yes it would be great if the laser cut cut the wax on wax off time, pva spray, etc ... i think you and paul have shown the value in cutting glass and all the layers on the machines.
Old 10-21-2021, 04:20 PM
  #167  
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i got the left wing skins layed up this morning, then pulled them out of the bags and trimmed them.






i also got the horizontal stab molds out and cut the airex core for those and checked the fit.






the plastic CF fabric template was also checked and adjusted.





im planning to get the horizontal stab skins layed up tomorrow before i leave for work on friday.

Once i get home next time, i’ll start test fitting all of the internal structurs and hopefully get a pair of wings and stabs closed up.
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Old 10-21-2021, 05:28 PM
  #168  
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looks super, sorry if i missed something.

can you pull both outer and inner skins (both wet) and have it pull outer skin excess resin through those holes in the airex?
Old 10-21-2021, 06:09 PM
  #169  
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Originally Posted by mr_matt View Post
looks super, sorry if i missed something.

can you pull both outer and inner skins (both wet) and have it pull outer skin excess resin through those holes in the airex?

yup. The entire layup is done all at once with everything wet and then put under vacuum. You can see in the pictures of it in the vacuum bag where the resin gets sucked out of the layup and into the bleeder/breather fabric.
Old 11-22-2021, 05:39 PM
  #170  
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i did the Horizontal stab skin layups a few weeks back, then got side tracked with return to work training.

Today I got the wing structure test pieces cut put on the laser and checked out. A few adjustments are needed here and there, but they are generally ready to go.

The horizontal stab pivot shafts, pivot spare and the aft carbon sock spar were also made up. All that fit well, so it all got wet out, splooged and is now closed up and curing overnight. I’ll have a set of Horizontal stabs tomorrow morning.








Old 11-22-2021, 08:55 PM
  #171  
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you do know that your sig line says something about a T-33C Talon?
Old 11-23-2021, 05:22 AM
  #172  
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Originally Posted by mongo View Post
you do know that your sig line says something about a T-33C Talon?
i dont see a signature line on any of my posts? If it does, then its probly a fat finger typo as the majority of my postings are done on a Iphone that has screen issues that apple refuses to fix, even with a recall.
Old 11-23-2021, 06:37 AM
  #173  
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Originally Posted by invertmast View Post
i dont see a signature line on any of my posts? If it does, then its probly a fat finger typo as the majority of my postings are done on a Iphone that has screen issues that apple refuses to fix, even with a recall.
You have to “view full site” to see signatures.
Old 11-23-2021, 09:25 AM
  #174  
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The Horizontal stabs are out of the molds and fit the fuselage extremely well. Up next will be to get the remained of the wing internals fine tuned, cut out and closed up. Once that is done, it will be back to the fuselage with the canopy frames being the first items to get finished and detailed. Those will then get molded so the fuselage plug can be fine tuned so those pieces fit perfectly.







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Old 11-23-2021, 01:08 PM
  #175  
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[QUOTE=invertmast;12703792]... so it all got wet out, splooged and is now closed up and curing overnight.../QUOTE]

Thomas,
What is your recipe for splooge and what tool do you use to apply it?
Thank, Gary

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