invertmast

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[QUOTE=Viper1GJ;12703899]For 100 grams of resin (and its proper hardener amount)....

I typically do 2 to 3 oz of milled fiberglass and whatever amount of cotton flock it takes to get the dryness of the splooge mixture, which is somewhere around another 2 to 3 oz. I use the plastic epoxy mixing cups for all my measuring.

For applying it , i put them in cake decorating pastry bags. i bought a 100 count of them a few years back from Aircraft spruce for a couple of bucks and still have half of them left.

Viper1GJ

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Thanks,
Gary

invertmast

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The first pair of wing panels are done. The ailerons are live hinged and i figured out i need to make up a jig to make the skin cuts more accurate. For the prototype set, they will work just fine how they are.

they are a little stout at 4lbs total for both with the flaps included. I have a few idea’s for reducing the weight if needed later on.

kevinthoele

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Looking good

Viper1GJ

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Hi Thomas,
The T-38 is looking awesome!



I have a question. A buddy and I were admiring your build today (wishing we could do it like you do it...) and were wondering why you did not use any front to rear ribs in the stabs. Can you let us know why there aren't any?
Thanks,
Gary

Ron S

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Looking purrty!...

tp777fo

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It was me. I'm not an engineer (but I have stayed in a Holiday InnExpress). I was wondering if the 2 spars that contain the torque tube will have enough torsional rigidity to hold the flight loads. Seems like a rib/ribs along the longitudinal axis of the stab would spread the loads better. Your project is awesome and I wish you much success.

invertmast

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Mostly because of how thin the H. Stabs are. That is a 1/2" diameter tube for the pivot shaft and there is barely 1.5mm above and below it for the skins. The entire thing also has the carbon skin layer, which when combined with the airex core makes for an extremely stiff structure. The Carbon sock/foam rod spar is un-necessary in reality and may be omitted from future parts.

invertmast

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That is something i may implement on the next ones, but has its own problems (lack of material above/below for a anti-rotation rod to reside in). The tube inside the stab is roughly 1" wide where it bonds to the skins, based on what i have seen from some other manufacturers, the setup i had in the F-14 (6" long, 1/8" titanium rod sandwiched inside some ribs) was complete overkill. This one may be on the opposite end of that, but its a fairly small stab (even though the pictures make it seem huge) and yet to be done testing will show one way or the other.. haha

Jetset

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I'll say it again. This project is simply AMAZING

invertmast

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thanks. Progress will begin again here soon. Lack of motiviation has taken hold for the past few months.

BDK74

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Awesome project. Would definitely be interested in one if you make them available.

causeitflies

I would be interested in one of these too. I was thinking shipping would be an issue but now it looks like I'm in drivung distance. I just hope you finish it before I'm too old to fly

Jetset

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Believe me man, I KNOW HOW YOU FEEL!!!!!!
This damn pandemic has killed my motivation in a lot of areas. Just tonight I actually did a tiny bit of work on some of my models. First time in two years pretty much!

Jetset

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I too am actually in driving distance. LOL Aprox 9 hours. I've drove farther than that for reasons not even close to being this cool!

crxmanpat

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Thomas,

This is an extremely awesome build! I hope you get the motivation back soon and continue working on it.

I've seen Brent fly his scratch T-38 many times and it is a thing of beauty! He recently told me he is thinking of converting to turbine now that he has gone to the dark side.

invertmast

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ive been 3D printing parting planes like crazy, so things are beginning to pick back up

crxmanpat

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That's great news Thomas! Even though I have a Global F-16XL and FeiBao F-15E on the way, this is something I would really love to have!

invertmast

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Here’s the past few weeks progress as the 3D printer has been busy printing parting planes.


in this photo is the main engine hatch, both canopies and the fuselage flange (at the exhaust) parting planes.




The forward canopy frames from parting plane.






PP test fit to the plug




all four parting plane pieces assembled





canopy sitting on its parting planes.





engine hatch parting plane pieces assembled.




i also picked up this plastic model to assist with the fuselage detailing. I also picked up a Draco Publications T-38C in detail book to help as well.




i also pulled the main fuselage off of the shelf that has been its home for the past 2? Years.

once i get back home from work later this week, i’ll begin to sand the fuselage smooth so the detailing can begin.

Viper1GJ

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Looking forward to seeing progress again. Really cool looking T-38!

invertmast

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thanks! The Fuselage detaila i have planned should really put this thing into a league of its own.

crxmanpat

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Thomas, glad to see you back at the 38 again! I do the same as you, buy plastic models to get some scale details for the build. Looking forward to more progress on this project!

invertmast

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Alrighty, here’s another photo dump. Not a whole lot of progress outside of more sanding. I did realize the nose around the windscreen has some chipmunk cheeks. Here i am thinking i was done with all the substantial body work. I’ll draw up and 3D print some correction pieces to add to the plug since tge windscreen needs the weird fairing thing infront it added anyways. It’ll be quicker and more symetric this way..

The canopy frame plugs are done being sanded, so i can so the detail and mold those two items. The fuselage will then get worked (if it needs it) to perfect the fit of those pieces. I’ll also get what little work needs done around the fuselage seam done so that is a nice fit. Then its detail time!

invertmast

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duplicate

Ron S

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Glad you're back onto it! When I did my project, I'm not sure why I never thought of FDM printing some of the parting planes... Good idea!
I did print out some 90 degree brackets to HOLD the parting planes to the plug, but not larger contoured pieces like you did...