Author Topic: CT-114 Tutor (RCAF / Snowbirds)  (Read 954 times)

Dave Winfield

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Re: CT-114 Tutor (RCAF / Snowbirds)
« Reply #22 on: October 09, 2015, 07:51:50 PM »
A couple more days, and a little more effort...
and I feel like I am getting back into the swing of things with this Tutor model!

I decided to continue with the Main Wings before anything else
and it turned out to be a little more work than expected.
Another example of how the design works, but it doesn't go together exactly as I want,
so a few adjustments have to be made.

The wing design is two parts (not including the wing tip pieces).



Similar to the P51 Mustang, these wings have an angled extension at the inboard root area.
(This is also the jet intake area...the intake parts will mount on top of the wing)



To create this in paper, requires splitting the wing into two parts and joining them together
after the front edge has been rolled/folded.
My first problem is getting a tight fit at the center of the leading edge.
The shape of the two parts just doesn't match.



So, I did some trimming, drew up a new part... did it twice....and eventually got a better fit.
But it takes a fair bit of careful gluing and patience.



But now my problem is with the seam that wraps around the wing.
(Here are two different test wings...I wanted to test the new part design twice.)
I just don't like that big seam running right around the wing like this.



And then I remembered the P51 design.
It has a similarly shaped wing.
And the paper model has two parts for each wing...but that angled area of the wing, is a smaller part.
(The basic p51 design is also a Nobi commission!)
So, why didn't Nobi use the same design for this Tutor Jet wing?
Probably didn't think of it, thats all.

So, I assembled all the parts (in Coreldraw) and created a one piece complete wing,
and then broke it into two parts again...but this time, one large wing part and a smaller part just for that extension area.



I had to try two test builds, and after a few tweaks, I got it to fit nicely.
And now there is no seam running through the wheel well openings!
If you are building wheels down, open wheel wells, that seam might have caused a big problem.
Not to mention trying to line up all the panel lines and flaps (across that seam).



But best of all...no ugly visible seam across the top of the wings.
The most visible area of the model (I think) is now clean and smooth.

So now, I can make up some Snowbird (red and white) wings and fit them to the model.






DAVE WINFIELD - GO TO WWW.CUTANDFOLD.INFO FOR MY DESIGNS AND LOTSA FREE STUFF!

Dave Winfield

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Re: CT-114 Tutor (RCAF / Snowbirds)
« Reply #23 on: October 11, 2015, 10:23:17 AM »
Still workin...printed out some Wing parts today (for the Snowbird test build).
Hopefully the rain delayed Nascar race will run today, and I'll work on the model while I am watching!
As I mentioned before, this first test build will be a wheels-up build.
I actually don't have the final landing gear designed anyway.

This made me realize I will need a display stand for the Snowbird model
and so I started to think about a pedestal type stand that I will include in the Tutor kits.

And that, prompted thoughts about the Snowbirds paint scheme.
Which team member do I add to the tail of the jet? And which serial number do I put on the plane?

First thing I did was research the Snowbird planes by hunting for photos of the aircraft where I can see the tail number and the serial number.
But I'm only looking at the most recent paint scheme design, since there have been a few variations over the decades.



And using found photos, I was able to put together a list of known Tail No./Serial No. combinations for all the planes.

*Looks like the Snowbirds have 12 planes at the ready, numbered 1 through 12.
But I believe only 9 fly at one time.
I guess three extra planes are backup in case of mechanical issues at an event?
Keep in mind, these are the only flying Tutors left in existence.
All other CL41s were retired decades ago, when they should have been!
This is a 55 year old aircraft!

Anyway...I realized that it would be hard to pick only one team number to put on the model
and there will undoubtedly be requests for other Tail numbers.
There might even be someone who wants to build a formation of nine aircraft!

So, I have added a complete set of Tails to the kit.
And alternate fuselage parts with the various serial numbers that go with each tail.
The main model will be aircraft number 1  (serial no. 114006)
with two extra pages added to this kit with the alternate parts.
This is just for the Snowbirds version of the model.


DAVE WINFIELD - GO TO WWW.CUTANDFOLD.INFO FOR MY DESIGNS AND LOTSA FREE STUFF!

Burning Beard

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Re: CT-114 Tutor (RCAF / Snowbirds)
« Reply #24 on: October 11, 2015, 10:54:41 AM »
Ain't that just where Corel really shines  ;D

Beard

Dave Winfield

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Re: CT-114 Tutor (RCAF / Snowbirds)
« Reply #25 on: October 13, 2015, 09:27:05 AM »
So, I hit a bit of a setback on Sunday... had to throw out the wings.

I assembled two wing (skins) ready to slip over the inner wing support
but I kept damaging the outermost (tiny) rib part.
Its a tight fit, and the rib lines up right at the edge of the wingtip,
(where the tabbed gluestrip for the wingtip is located.)

Then I noticed that the wing skin was not sliding on deep enough to meet at the underside of the fuselage.
It wasn't covering the alignment marks (or the main spar holes in the belly).

After a while, I realized that the top side of the wing was hitting the side of the fuselage too early,
not allowing the wing to go on any further.
So I started trimming...
eventually getting the wing skin located far enough inboard.

But this had moved the position of the Landing gear doors too far inwards
and now they didn't line up with the wheel well boxes!

Anyway...to make a long story shorter...I threw out the old wing skin parts, redrawing them,
adding the necessary length to the belly side, slightly shortening the upper side,
and making a few minor adjustments to the Spar and Rib assembly.

New skins seem to slide on much easier and line up...a touch looser on the internal ribs,
but I think thats acceptable (gives you some tolerance to move the skins a bit, and line up the wheel well boxes).

Fingers crossed...I am about to glue these wings into place...



Oh yes...I also threw out all the Tail parts and created new ones!
LOL

The vertical was okay, but the attachment of the two horizontals was delicate and I didn't like it.
I also didn't like the shape of the upper extension (above the horizontal tailwings).

My new design has a one piece horizontal wing...and I cut the top off the vertical to receive it.
Then, you just add a small extension part to the top.

The new Tail is still a bit delicate.  The two elements (vertical and horizontal) are thin and have a very
small connecting area. Even at this scale, its a delicate part.  I don't want to over complicate the design.
So, as long as you use some good glue, and take your time with the assembly, it'll work.




DAVE WINFIELD - GO TO WWW.CUTANDFOLD.INFO FOR MY DESIGNS AND LOTSA FREE STUFF!

milenio3

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Re: CT-114 Tutor (RCAF / Snowbirds)
« Reply #26 on: October 13, 2015, 01:33:16 PM »
I've been missing the progress on this Canadian Snowbirds, but I just read the whole thing.

I used to see them at the El Paso, TX airshow back in the 90's. Haven't seen them since... a while.

I hope to see them again soon. The show is amazing as the airplanes are not as big as the
Blue Angels F-18's.
- Gerardo
facebook.com/paperjerry

Dave Winfield

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Re: CT-114 Tutor (RCAF / Snowbirds)
« Reply #27 on: October 19, 2015, 09:50:30 AM »
More work...slowly...and more modifications.

The wing assembly...fitting to the fuselage...root fairings...and engine intake housings
are proving to be a challenge.

Once again, not everything fits together easily...I think the biggest issue is the thickness of cardstock.
Curvy things don't curve that easily. Fit tolerances are thrown out of whack.

But I am making changes and adjustments to suit my tastes and a simpler assembly.
(Nobi has been informed...because I wanted to make sure he knows that I have no problem with his design work.
Sometimes, what looks good in the design stage, doesn't go together perfectly in the real world)


Anyway, I made an earlier suggestion to Nobi to extend the back end of the wing roots, to create
that little curved extension where it joins to the fuselage, and to create  the concave wing root fairing.

Nobi created a two piece part that is very easy to assemble and shape...but it fights back when you try
to install it on to the wing root!  I just could not install the part cleanly, and there is a conflicting compound
shape which resulted in a crease and a wrinkle.



After some experimenting ....and studying of Tutor photos...I realized that I could get away with a straight angle part
at the root of the wing, instead of the curving edge.
I also didn't need a two-piece fairing because it disappears under the engine housing.

So, I've created a new part that appears to work...but I'll have to wait for the next test build to try it out.
(I can't remove the parts from this build at this point.)


I was also able to make a few adjustments to the fit of the underside intake housing, including how the white Snowbirds
paint scheme lines up. (You can still still the missing section on the fuselage...this has already been adjusted in the kit.)



Getting closer to the end now!
But it looks like I will have to build another test to check out all the modifications.
I also have to do a Landing gear build.
Maybe I'll do another paint scheme just for variation.
Maybe I can find someone to do another Snowbirds test build at the same time?


I
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Vermin King

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Re: CT-114 Tutor (RCAF / Snowbirds)
« Reply #28 on: October 19, 2015, 11:45:10 AM »
I wish I were better at aircraft, but I never do them well.  When I did the memorial plane for my mom and aunt's uncle who died in a crash in WWII, it took me three builds to get two that were passable.  And that was on 'simple' planes.  I hope that Gerardo will take you up on the offer.
There are no strangers in this world ...
Only people I haven't embarrassed ... yet

Dave Winfield

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Re: CT-114 Tutor (RCAF / Snowbirds)
« Reply #29 on: October 19, 2015, 12:08:58 PM »
Gerardo still has one (or maybe two?) models that i am still waiting to see! lol
DAVE WINFIELD - GO TO WWW.CUTANDFOLD.INFO FOR MY DESIGNS AND LOTSA FREE STUFF!

Dave Winfield

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Re: CT-114 Tutor (RCAF / Snowbirds)
« Reply #30 on: October 25, 2015, 07:42:58 AM »
I'm struggling to make a mold for a vacuform canopy...
but other than that, I am at the end of this test build.

I am putting on the last few items, like little bracketry on the wing flaps.
And the underside pylons and diesel tanks.



Since this is a Snowbirds aircraft, it would have two diesel fuel tanks underneath for the smoke generators.

I think all the exhibition aircraft carry these, but some display aircraft don't.
So, I guess its an optional thing for the builder.



Next step is some sort of "display stand" (since this model is wheels up) that I can include in the kit.
And then another full test build...wheels down...of another Tutor jet (different paint scheme of course).
DAVE WINFIELD - GO TO WWW.CUTANDFOLD.INFO FOR MY DESIGNS AND LOTSA FREE STUFF!

Dave Winfield

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Re: CT-114 Tutor (RCAF / Snowbirds)
« Reply #31 on: October 27, 2015, 06:28:09 PM »
Well, I finally got a canopy made that I can use...but not without a fight!

I managed to make a form from Sculpy...my third.
And then I botched two vacuform attempts.

Using very thin plastic, I got a passable canopy.
Not good enough to sell...but after the paper frame was attached, it didn't look too bad.
Main thing is, it has the correct shape, so it fits.



And that means I can finish up this build.
Fit the canopy...and the bracket things in front of the canopy.

Also sorted out a display stand, which I will include in the final kits (decorated to each model).

Full set of HQ photos (of this model) here:
https://www.flickr.com/photos/65936213@N08/albums/72157660391251542

Now I will focus on the Golden Centennaires version
and start work on the Instruction pages.



DAVE WINFIELD - GO TO WWW.CUTANDFOLD.INFO FOR MY DESIGNS AND LOTSA FREE STUFF!

Loui

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Re: CT-114 Tutor (RCAF / Snowbirds)
« Reply #32 on: November 04, 2015, 12:12:39 PM »
magnifique.... (yea' I just google it LOL!)

I do like very much the wing shape method approach and the speed breaks option