RARE COX THIMBLE DROME PROTOTYPE "PT-19 COROPLAST BUILD" GAS MODEL AIRPLANE

Maybe two more.  .

One another Cox Black Widow airplane only this time with a SIG 4" airfoil wing vice the 3 1/4" of the original and move the CG forward to accommodate the Cox Black Widow engine.  I have plans to fly the orange/yellow one and probably crash it along with a Testors "Fly-em" that I'm currently working on.  Never flew one of those and it's on my bucket list.

It's Scientifics version of a F-100 shortened by the looks about 50%.  A rebuild of one I found on ebay several years ago. Not new, I told it's story here awhile back.

rsv1cox wrote:Maybe two more.  .

One another Cox Black Widow airplane only this time with a SIG 4" airfoil wing vice the 3 1/4" of the original and move the CG forward to accommodate the Cox Black Widow engine.  I have plans to fly the orange/yellow one and probably crash it along with a Testors "Fly-em" that I'm currently working on.  Never flew one of those and it's on my bucket list.

It's Scientifics version of a F-100 shortened by the looks about 50%.  A rebuild of one I found on ebay several years ago.  Not new, I told it's story here awhile back.  

rsv1cox: when i went to Japan on my first assignment in the USAF, the last of the F-100's were passing thru my base there. We got to look at some of our ECM gear on the bird, then they were gone and the F-105 replaced them. Some of our pilots flew EB-57 ECM planes against the Self Defense Air Force of Japan, JASDAF. The F-105's played games with JASDAF also, but were there mainly to be repaired for their trip SOUTH.
    I have always loved the F-100 and would like to make a Coroplast version similar to the drawing you displayed, but longer and sleeker as in the last picture you showed.  I may have to make the wing a LITTLE larger than real life to fly, but what is creativity anyway? If you remember the F-105 didn't really have wings , it was a giant rocket engine with a pilot, or two sitting on top. No laughs.

happydad

F-104 looks like a rocket more than F-105, I think. I very closely watched a Turkish Air Force F-104 while flying and it jettisons a big smoke from its exhaust. It had very short wings. I read in a book that ground personnel must wear helmets for safety, because it has thin and sharp edged wings.

I have loved fighter aircraft ever since I built a Guillows Spad back when I was around 12.

My affection for the piston powered P-38 should be well known here.  But I especially love jets.  When I first went to Pensacola they were still flying the P-80 "Shooting Star" and the Navy used the trainer version (T-33) for advanced training of Naval Aviation Cadets.  

My brothers Fraternity room mate in college flew F-104's and F-105's, the F-105 in Vietnam.  One day we were talking and I referred to the F-105 as "Thud" and I could see that he was annoyed.  I asked why, and he said it was a derogatory and offensive term when used in reference to the F-105 and HD I was wondering if you thought the same?

F-104 Wing Levent 3:40 in.

https://www.bing.com/videos/search?q=f-104+wing&docid=607993088031458126&mid=DCB9D3B7C9C7972F4A51DCB9D3B7C9C7972F4A51&view=detail&FORM=VIRE

3.4 ins! Very thin for such a big jet.

Here are wing protecting sleeves, to protect wing leading edge from dents:

Those willynillies mini pilots are very suitable for PT-19 and other Cox models . Thanks sosam117

https://willynillies.com/shop/ols/products/mini-wwi-us-pilot-bust

Levent Suberk wrote:3.4 ins! Very thin for such a big jet.

Here are wing protecting sleeves, to protect wing leading edge from dents:

Hi Levent, I meant the video of the F-104 wing begins at the 3 minute 40 second mark.

Bob

Sorry for misunderstanding The thickness of the wing varied from a maximum of 4.2 inches at the root to 1.96 inches at the tip. (www.globalsecurity.org)

Levent Suberk wrote:Sorry for misunderstanding The thickness of the wing varied from a maximum of 4.2 inches at the root to 1.96 inches at the tip. (www.globalsecurity.org)

Lavent:  funny you guys should bring up the F-104. Again when I was in Japan, guess who flew the F-104. Yup, the JASDAF. The Japanese Self Defense Air Force. They had a tiny little squadron over in the corner of the base and they would proudly take off 2 or 4 at a time in formation so the 1,000’s of Japanese onlookers could take photos at the end of the runway.
   Most of the USAF planes never reached the end of the runway, except for civilian flights, they were up, up, and away keeping the planes far away from the cameras at the end of the runway. We never could get close to the JASDAF planes, but their dignitaries were always being escorted around our latest, old shot up, unknown to them F-105’s and eventually the F4 phantom.  Man I miss those days. NOT.
   The F-104 was eventually modified and used by NASA as a chase plane and “other” duties during the chase to the moon. Nuff said.
   I loved the F-104 also. But if you have ever been near an F-105 when they takeoff, you will understand why they were called the Thunderjet. The single jet engine would make a sound like thunder when they kicked into afterburner before they could get rolling. My barracks were about 100yard, or so, from an active runway when I was in Thailand, not so close in Japan.
   
My ears still ring.  

That’s all folks.

Happydad

Levent Suberk wrote:Sorry for misunderstanding The thickness of the wing varied from a maximum of 4.2 inches at the root to 1.96 inches at the tip. (www.globalsecurity.org)

My fault, I certainly wasn't very clear in what I meant.

Bob

At 1:30 ! Turn up the sound, like a real air base!

Levent Suberk wrote:At 1:30 ! Turn up the sound, like a real air base!

Lavent: where was that? And BTW, I didn’t hear the boom of the afterburner. Maybe because the crowd was RIGHT NEXT to the runway.

Happydad  

Carswell AFB, Texas.

Levent Suberk wrote:Those willynillies mini pilots are very suitable for PT-19 and other Cox models . Thanks sosam117

https://willynillies.com/shop/ols/products/mini-wwi-us-pilot-bust

Lavent: I ordered some of the pilots. I will let you know how they look. They are unpainted. And come in mini, micro, ww1, ww2, and German if I remember.

Happydad

rsv1cox wrote:I have loved fighter aircraft ever since I built a Guillows Spad back when I was around 12.

My affection for the piston powered P-38 should be well known here.  But I especially love jets.  When I first went to Pensacola they were still flying the P-80 "Shooting Star" and the Navy used the trainer version (T-33) for advanced training of Naval Aviation Cadets.  

My brothers Fraternity room mate in college flew F-104's and F-105's, the F-105 in Vietnam.  One day we were talking and I referred to the F-105 as "Thud" and I could see that he was annoyed.  I asked why, and he said it was a derogatory and offensive term when used in reference to the F-105 and HD I was wondering if you thought the same?

F-104 Wing Levent 3:40 in.

https://www.bing.com/videos/search?q=f-104+wing&docid=607993088031458126&mid=DCB9D3B7C9C7972F4A51DCB9D3B7C9C7972F4A51&view=detail&FORM=VIRE

rsv1cox: just noticed your reference to “thud”. Thud or lightning noise was what it sounded like when the F-105 goes into afterburner. Kabooom. Loud, really loud. My barracks in Thailand was less than 100yards from the runway. The takeoff end, but we could hear them from almost 1 mile away, 5000foot runway, lots of ordinance and 2 extra fuel tanks. It sounds like a lightening strike at 2a.m. When I was sleeping in 120F. Temperature. They always left in the dark so no one could tell which direction they were going, yeh right. Just look at the bright red light in the sky, the afterburner of the F-105. It was very heavy with all that “extra” weight.

Some may have referred to the sound the F-105 made when the single engine failed and the plane dropped like a rock, tiny wing on giant rocket engine, back to earth. Thud.

   Those were the days.

Happydad        

Bill's reasoning was that those that used the term "Thud" were referring to the sound the 105 made when it hit the ground in a crash as the loss rate was quite high. I just thought it short for Thunderchief.

NEW222 wrote:Well, i just got into work, but I did remember to look. The one i have is Krylon Fusion for plastics. So this may be what you are looking for.

NEW222: I bought some of the Krylon Fusion spray paint today and the results weren’t pretty. I have to move to the MacBook to upload pics. One minute.
I purchased the Krylon Fusion spray paint colored light blue. Painted a sample of my "coroplast" material to see the effect and didn't didn't expect to see this:


pic #1. the blue is where the paper covering was, and the other is where the paper was peeled away.


pic #2 opposide side, white is the white paper covering. blue is the blue paint over the white paper.

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pic#3 side view. see damage to "coroplast"

I'm not sure this is the Krylon Fusion you were talking about.


Happydad.

Well, it has been a busy week and weekend. Cutting the coroplast, shaping the fuselage. What a learning lesson, and finally "putting one together". Sort of. See results:


fuselage showing cracks, i rubber banded the fuselage around 4 sub C batteries and superglued the cracks. Then super glued the inside cuts that I had made too deep in the first place.


fuselage, wing, rudder, R-C version, and stabilator


underside


closeup of stabilator

thanks to Lavent and all his hard work finding and tileing the drawing so we could print it here to 100% Full Size and for his efforts with the emblems.

Now for the hard part.

happydad  

Happydad. Products obviously differ between our countries, but what you have used appears to be foam-board. Coroplast is what we call Core-Flute. It's like corrugated cardboard only plastic. Most real-estate signs are made from it out here.
Because it has a "grain" then you can more easily bend straight lines, making a neater fuselage for starters. The corrugations also give it a lot more strength and stability. I think your foam-board wings may fold pretty easily. Maybe a couple of bamboo skewers pushed into the wings might help strengthen them.

Rod.

Now I'm confused.

I look up Coroplast and I get this:



Which is why I was concerned about how you were going to treat the open edges.  What you show looks more like the White Board that I got from Hobby Lobby and used on my Jim Walker Firebaby reproduction which has a tight foam core that is not affected by the Krylon paints that I use.

Maybe Coroplast is a generic term?

Hd, you used foam board but not corrugated plastic sheet. You can buy Coroplast:

https://www.amazon.com/Premium-Replacement-Coroplast-Available-Multiple/dp/B07D3BTWM5/ref=mp_s_a_1_18?dchild=1&keywords=Coroplast&qid=1598186534&sr=8-18

Coroplast brand web site:

https://www.coroplast.com/

Isn't it better to build it with several Coroplast color sheets? No fuel proofing, no painting, no cracks.

Styrofoam is EPS and it is different than EPP foam. Krylon don't work with EPS at least I know.

https://www.foammoldingmachines.com/epp-vs-eps-foam#:~:text=EPP%20and%20EPS%20foam%20have,a%20high%20deformation%20recovery%20rate.&text=Expanded%20Polystyrene%20(EPS)%20is%20a,and%20tough%20closed-cell%20foam.

Yes Bob, you are correct. What you have pictured is indeed coroplast, the plastic sheet with the 'flutes' in it. What the plane pictured was built with was generic foamboard. However, foamboard is paintable with a bit of work. I have used thinned white glue brushed onto foamboard and allowed to dry. Then you can give it a coat of primer or paint if you like.