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Post  howardhb Tue Feb 27, 2024 7:49 am

Greetings all.

I am a SERIOUS PT19-a-holic! (actually, all things Cox!)
I have a couple, and they are so dear to me: I cannot even think about risking flying one again, after  introduction to my first one, at age 8, way back in 1974!

I have been designing machinery (3D CAD) for the motor industry for close on 35 years, and a few years ago I got into 3D printing...

Recently a friend gave me a very sad PT-19...
The front of the fuselage was severely damaged (by a fuel fire), it was missing its pilots, Elevator, Rudder, engine mounting plate and the wing was in 3 pieces....

The recent chatter about Mecoa producing PT-19 parts is exciting, but I won't hold my breath...
I visited their website, seems like mere "click-bait" at the moment..

So, it occurred to me to try to 3D print the missing parts first: Engine mount plate, Elevator and a Rudder.

First, I had to design an "exact copy" of the parts, using my 3D cad software, SolidWorks.

Here is my design for the Elevator ...

PT-19 3D printing Cox_pt10

I then had to figure out how to section each part in order to print them, as, 3D printing is not as simple as "click and print"...

PT-19 3D printing Cox_pt11

H.


Last edited by howardhb on Tue Feb 27, 2024 8:53 am; edited 2 times in total
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Post  howardhb Tue Feb 27, 2024 7:51 am

And here is the Rudder...

PT-19 3D printing Pt-19_10

PT-19 3D printing Pt-19_11

Straight off the printer...

PT-19 3D printing Rudder10


Last edited by howardhb on Tue Feb 27, 2024 8:05 am; edited 1 time in total
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Post  howardhb Tue Feb 27, 2024 7:55 am

The printed rudder parts are glued together with cyanoacrilate (superglue)...

PT-19 3D printing Blue_r10

PT-19 3D printing Yellow10

H.
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Post  howardhb Tue Feb 27, 2024 7:58 am

Elevator glued together the same way...

PT-19 3D printing Img_2010

PT-19 3D printing Img_2011

PT-19 3D printing Img_2012

H.
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Post  howardhb Tue Feb 27, 2024 8:00 am

Installed, they look the part !!!

I made sure that the full elevator range "up/down" is exactly as the stock Cox elevator.
PT-19 3D printing Img_2013

I didn't succeed on the first "go-around"  ( contol line flying pun intended !)
PT-19 3D printing Img_2014

H.


Last edited by howardhb on Tue Feb 27, 2024 8:27 am; edited 1 time in total
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Post  howardhb Tue Feb 27, 2024 8:03 am

The Elevator and Rudder are 1.2mm thick and pretty tough, printed from a material called PETG.

PT-19 3D printing Polish10

[/url]PT-19 3D printing Img_2015

More soon...

Howard.
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Post  getback Tue Feb 27, 2024 9:55 am

OH Man this is Great News ! Can't wait to see what you do with the fuse ! Small Cox Logo Very Happy Small Cox Logo
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Post  cstatman Tue Feb 27, 2024 10:02 am

wow, spectacular work! keep it up.
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Post  1/2A Nut Tue Feb 27, 2024 11:25 am

Very nice thumbs up!
For CL could print a airfoiled wing for better handling, stunts and landings.
Possible conversion to transform into park flying RC 4ch.

.... ...... .... Flying

Small Cox Logo Thumbs Up

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Post  944_Jim Tue Feb 27, 2024 11:42 am

Hubba hubba hubba! I sure do like this.

Maybe I tried the wrong CA, but I used The Trademark CA in the white/green bottle decades ago to attempt a Stuka rehab. The glue failed the minute raw fuel got in it. I do know there are CAs marketed for hobby work, so I'm sure this laminated surfaces thing will work out...I do hope so, and watch with bated breath!

_________________
Never enough time to build them all...always enough time to smash them all!
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Post  howardhb Tue Feb 27, 2024 11:58 am

So, I have a very old fuselage, that uses a standard tanked Babe Bee, but I could'nt find an engine mount plate...(must be early sixty's)

I had to 'wing it' as far as my design goes, by looking at online photos of them an replcating what I saw...

PT-19 3D printing Bee_ba10

PT-19 3D printing Back_p10

PT-19 3D printing Backpl10

I will tackle the fuselage (for the later models) that use a horse shoe back plate next....

H.
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Post  howardhb Tue Feb 27, 2024 12:10 pm

This is my Happy Place  Very Happy

PT-19 3D printing Happy_10

H.
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Post  roddie Tue Feb 27, 2024 12:35 pm

Outstanding!!! Thank you for sharing!!!
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Post  rsv1cox Tue Feb 27, 2024 12:51 pm

Howard - I'm enjoying your thread. You have discovered a gold mine.

Bob
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Post  Coxfledgling Tue Feb 27, 2024 1:09 pm

Hi Howard,

How is that plastic for model technics gn15 fuel and being brittle please ?

Internet really c@£p here and I only have s cheapo mobile internet phone for this stuff.

Still waiting for your pictures to come thru, but in town, a bus ride away I have access to lightning fast real computers with big screens and A4 printers, in the public library.

Pm me your email address please as Comms are so much easier that way.

I have what I think is an engine mount which I will photograph and post later.

I have two white wings that had red eagle like stickers on them.

Back later..
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PT-19 3D printing Empty Pictures

Post  Coxfledgling Tue Feb 27, 2024 1:19 pm

Joeburg....

Pictures just opened, nice work, the white saloon car, escort mk1???

I don't have a real computer unfortunately...
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Post  howardhb Tue Feb 27, 2024 1:25 pm

Glow fuel has no effect on PETG plastic. It is however a little more brittle than original. Be that as it may, I can also print the parts using ABS, or even carbon fibre reinforced ABS ! (just much more expensive)

Yeah, that little Eskort was my very first car, a 1974 1300 L, which I bought second hand in 1984!

H.
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Post  EXModelEngines Wed Feb 28, 2024 12:59 pm

Nice project! We looked into it about a year ago, maybe more now, but ultimately ran into issues with the print finishes. In my opinion the smaller parts turned out okay, but a couple samples of the wing had problems getting the angles right. Maybe something to revisit as quality improves with the printing process.

Matt
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Post  Yabby Thu Feb 29, 2024 4:19 am

its great that you have looked into it Matt cheers were it possible at affordable prices it woud be way cool Beer Cheers how I would love to fly a plastic pt-19 again. cheers cheers and maybe this time empty a fuel tank without crashing sunny
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Post  EXModelEngines Thu Feb 29, 2024 9:52 am

The basic idea was to use a Babe Bee engine with an older style mount and keep the fuselage as limited as possible. Probably slots for either ready available pilots to slide in or a printed pilot that could be painted.

I'd certainly consider giving the project another look if there was interest. Biggest issue is I'm not sure how many people it would appeal to given surface finishes would not be as good as that of an injection mold.

Cost is another consideration, but don't believe that would be the limiting factor ultimately.
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