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Cox Engine of The Month
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F4D Phantom II's

"Cox .049 Marine inboard engine."

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Post  roddie Fri Dec 30, 2022 9:51 pm

When this forum had its first 1/2A profile control line speed-contest back in 2013...... I opted to model a modern-day Reno/Air-Racer of a highly-modified Grumman F8F-2 "Bearcat" which became known as the "Rare Bear". I chose to model the early version which was white and gold.

At the time.. there was an available decal-sheet for some RTF/RC version of the aircraft.. maybe E-flite. This would prove to be extremely useful.. as the "image" had all the correct scale graphics that were on the full-size aircraft. There was only the matter of scaling-down to the size that "I" needed. My wife Lynne helped me to get a few different-scale layouts laser-printed.. to see which size looked correct.

I'm getting way ahead of myself.. sorry. It's not too difficult to make your own plan from a 3-view of any aircraft that was mass-produced. I did that with the Grumman F8F-2. I had to.. because there were no kits available for this type of event. Control-line kits "in general" had lost their popularity. All of us who entered the contest needed to build a model that could be recognized as a scale-model.. one way or another.  Wink

Here's a photo of My Rare Bear.. straight-on..

The "Grand Illusion"..  20221210

The cowling is primarily what you see.. I needed to replicate that "round-engine" look for my entry.

The photo below shows a little more of what can be done to create a more 3D illusion.

The "Grand Illusion"..  20221211
The "Grand Illusion"..  20190845
The "Grand Illusion"..  20190846
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Post  roddie Fri Dec 30, 2022 10:12 pm

This model has yet to fly
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Post  roddie Fri Dec 30, 2022 10:38 pm

deleted


Last edited by roddie on Sat Dec 31, 2022 11:05 am; edited 1 time in total (Reason for editing : deleted)
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Post  GallopingGhostler Fri Dec 30, 2022 11:53 pm

Fantastic art work and modeling work, and glad to hear also that your wife partners with you to make your dream model come true. Just curious, what did you use for the really sleek looking radial cowling?
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Post  rsv1cox Sat Dec 31, 2022 9:57 am

My love affair with that plane continues!!!!!!
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Post  rdw777 Sat Dec 31, 2022 5:10 pm

The cowling “just works” with that plane…. Wonderful art work Roddie!!!
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Post  HalfaDave Sat Dec 31, 2022 8:53 pm

Wow,

That is amazing !
This is why I like this forum...
Cox engines on balsa,
And a plastic cowl,
On a plane, Cox,
Did not make...
Respect,
Dave
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Post  Oldenginerod Sat Dec 31, 2022 10:53 pm

rdw777 wrote:The cowling “just works” with that plane…. Wonderful art work Roddie!!!

"Glade" air freshener can cap if I recall. Huh...
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Post  Yabby Sun Jan 01, 2023 5:25 am

That is a seriously cool Jigger Roddie!!! Thumbs Up cheers To be able to build something like that is truly amazing. So many different skills required to build it, and all of the skills need to be top notch to end up with the result you have! Clapping

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Post  roddie Sun Jan 01, 2023 1:36 pm

GallopingGhostler wrote:Fantastic art work and modeling work, and glad to hear also that your wife partners with you to make your dream model come true. Just curious, what did you use for the really sleek looking radial cowling?

Thanks George. It was a LOT of fun putting that model together. The radial cowling is a "cap" from an aerosol can.

The "Grand Illusion"..  Dsc02914

The model was built around the cowling right from the start.

The "Grand Illusion"..  11-16-11
The "Grand Illusion"..  11-15-12

The top/bottom of the profile fuse's nose needed to fair-into the inside diameter of the cap.. and I needed to make four stand-off tabs to prevent any side to side movement of the cowling. There's a full circumferential-ridge just inside the cap which bears on the four tabs and against the top/bottom of the firewall.

The "Grand Illusion"..  3-16-111
The "Grand Illusion"..  3-6-1410

I had originally planned for an "upright" engine cylinder orientation but later opted for the horizontal/outboard position.

The "Grand Illusion"..  1-24-116
The "Grand Illusion"..  3-18-110
The "Grand Illusion"..  3-25-110
The "Grand Illusion"..  3-27-112
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Post  roddie Sun Jan 01, 2023 1:38 pm

rsv1cox wrote:My love affair with that plane continues!!!!!!

Thank You Robert.. it continues with me as well!
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Post  roddie Sun Jan 01, 2023 1:48 pm

rdw777 wrote:The cowling “just works” with that plane…. Wonderful art work Roddie!!!

Thank You Robert! Finding this image of a Thunder Tiger model's decal-sheet was definitely key..

The "Grand Illusion"..  Decals10
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Post  roddie Sun Jan 01, 2023 2:00 pm

HalfaDave wrote:Wow,

That is amazing !
This is why I like this forum...
Cox engines on balsa,
And a plastic cowl,
On a plane, Cox,
Did not make...
Respect,
Dave

Thank You Dave! Thumbs Up Small Cox Logo I Love This Forum! Balsa flies Better!
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Post  roddie Sun Jan 01, 2023 2:02 pm

Oldenginerod wrote:
rdw777 wrote:The cowling “just works” with that plane…. Wonderful art work Roddie!!!

"Glade" air freshener can cap if I recall.  Huh...

Ha Ha! Rodney remembered! Thumbs Up
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Post  roddie Sun Jan 01, 2023 3:32 pm

Yabby wrote:That is a seriously cool Jigger Roddie!!! Thumbs Up cheers  To be able to build something like that is truly amazing. So many different skills required to build it, and all of the skills need to be top notch to end up with the result you have!  Clapping

Yabby

Thank You Yabby! There were (and still are) plenty of challenges associated with the designing/building/finishing and flying of this model.

The latter has yet to happen.. but not for the lack of a couple of launch attempts. Only a couple though. Those launches were plagued by gremlins which prevented the model from becoming airborne.

The cowled-in engine was difficult to prime and start. Once started and running, the model would "nose-over" when released from my launching-stooge.

There are several theories as to why this happens.. and I've heard plenty of suggestions. Being as over-built as this model is; I was concerned about it being "tail-heavy"... which is not conducive to nose-over launches. What "is" conducive to nose-over launches; is gear-mains that are near to the CG/balance point.

I "could" make-up an alternate pair of strut-assemblies which would be slightly longer.. and angled more forward. Doing so would detract from the scale-appearance but may achieve getting the plane in the air.

The propellers tried have both been 2-blade; 4.75" X 4" (RH) and a  5" X 4" (LH). These choices wouldn't ordinarily raise concern.. except that the engine cowling comes to a 2.5"+ diameter at its rearmost point. I suspect that the cowling deflects the thrust outward in such a way as to make any UP-elevator input ineffective at pinning-down the tail under taxi.

The elevator on this model is of scale proportions (huge) and full-span hinged.

The "Grand Illusion"..  4-10-118

I'm tempted to remove the engine cowling and swap-out the high-performance engine for a stock/integrally-tanked (5 or 8cc) "Bee" engine for ease of starting.. if nothing else.

That's a subject for another thread.. and we'll keep this one on the subject of the build.

Thanks again Yabby for your praise. Thumbs Up Thumbs Up
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Post  GallopingGhostler Sun Jan 01, 2023 3:50 pm

roddie wrote:
GallopingGhostler wrote:Fantastic art work and modeling work, and glad to hear also that your wife partners with you to make your dream model come true. Just curious, what did you use for the really sleek looking radial cowling?

Thanks George. It was a LOT of fun putting that model together. The radial cowling is a "cap" from an aerosol can.

The "Grand Illusion"..  Dsc02914

The model was built around the cowling right from the start.

The "Grand Illusion"..  11-16-11
Interesting, Roddie, I would have never guessed. Other containers I have used, the vitamin supplement bottles just didn't have that much of a taper for such streamlining. Similar to you, I did similar construction philosophy when I made my half-A Ringmaster Gee Bee Z variant. The top end has a greater radius on the 2 inch diameter bottle, making for a sleeker semi-streamlined result.

The "Grand Illusion"..  Engine11
Cowl Front.

The "Grand Illusion"..  Ringgb10
Aircraft completed, front view.
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Post  roddie Sun Jan 01, 2023 4:16 pm

GallopingGhostler wrote:
Interesting, Roddie, I would have never guessed. Other containers I have used, the vitamin supplement bottles just didn't have that much of a taper for such streamlining. Similar to you, I did similar construction philosophy when I made my half-A Ringmaster Gee Bee Z variant. The top end has a greater radius on the 2 inch diameter bottle, making for a sleeker semi-streamlined result.

The "Grand Illusion"..  Engine11
Cowl Front.

The "Grand Illusion"..  Ringgb10
Aircraft completed, front view.

I like that George! An advantage to your "zero-taper" cowling is being able to use two screw-mounts top/bottom.. eliminating any side-to-side movement.

Is that a Gilbert engine inside there?

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Post  GallopingGhostler Sun Jan 01, 2023 4:59 pm

roddie wrote:I like that George! An advantage to your "zero-taper" cowling is being able to use two screw-mounts top/bottom.. eliminating any side-to-side movement. Is that a Gilbert engine inside there?
You're welcome, Roddie. It is an A.C. Gilbert .074 Thunderhead. I have yet to run it, but will one day. I may have to move the tank top just below the venturi. These side port engines using the piston skirt as the valve prefer to suction feed with a lower tank versus gravity feed, and may run into issues of run reliability, but that will be revealed in running it.
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The "Grand Illusion"..  Empty main-gear

Post  roddie Sun Jan 01, 2023 5:16 pm

Apart from the engine cowling; the main-gear construction, placement and trim contribute to the overall illusion of a scale-model appearance..  to a semi-scale slab-wing/profile-fuselage model.

The two main struts are constructed of .062" music-wire with cherrywood blocks that mount to a hardwood strip-spar built into the wing.

The "Grand Illusion"..  11-19-18
The "Grand Illusion"..  11-19-19
The "Grand Illusion"..  11-23-10

I had the gear-door decals scaled down to fit some pieces that I'd cut from simple thin clear plastic sheet. The doors on the struts simply "slide-on" over the axles.. and the tops of the doors attach to the cherry blocks via 2-sided tape. The wheels you see are one's that I made on a CNC machine. The tires are O-rings. The hubs are bushed with alloy tubing. The wheel-collars are the Goldberg "spring-type" to fit the 1/16" dia. music-wire.

The "Grand Illusion"..  11-19-20

Painting begins. Flat-white primer-coats. Since white is the base color... this works out well. I only need to keep it clean, prior to applying a final clear-gloss.

Notice the smaller pair of doors. They mount to the fuse's belly. I was hesitant to add them.. and didn't until almost finished.

The "Grand Illusion"..  3-22-111
The "Grand Illusion"..  4-19-110
The "Grand Illusion"..  6-12-110
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Post  roddie Sun Jan 01, 2023 6:02 pm

I'm getting ahead of myself with the way I attempted my illusion. The painting has started.. and the white-coats look really sterile... but kinda cool.

The "Grand Illusion"..  3-22-112

Since the trim-color is "gold"... the idea was to apply my gold paint in a pattern that tapered-back from the engine-cowling and faired back into the wing-root top and bottom. The bottom has a staggered pattern which was just something that I tried to give a more curved-look to otherwise flat surfaces having abrupt 90 degree intersections.

The "Grand Illusion"..  3-28-114
The "Grand Illusion"..  3-28-115
The "Grand Illusion"..  3-28-116
The "Grand Illusion"..  3-28-117
The "Grand Illusion"..  3-28-118
The "Grand Illusion"..  4-10-119
The "Grand Illusion"..  4-10-120
The "Grand Illusion"..  4-22-111
The "Grand Illusion"..  4-22-112

and the full scale subject..

The "Grand Illusion"..  07258610
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Post  roddie Sun Jan 01, 2023 6:10 pm

The "Grand Illusion"..  5-15-113
The "Grand Illusion"..  5-3-1414
The "Grand Illusion"..  4-24-117

current photo.. note: the different wheels and painted canopy.

The "Grand Illusion"..  20230110
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Post  NEW222 Thu Jan 05, 2023 9:48 pm

Funny thing as I know it was a while ago, but I remember when your Rare Bear was born here on CEF.
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Post  aspeed Fri Jan 06, 2023 12:14 pm

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Post  HalfaDave Fri Jan 06, 2023 9:56 pm

Hi roddie,

That plane is awesome, big time.
That tank,
Is another form of art...
Big respect,
Take care,
Have fun,
Dave
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Post  Yabby Fri Jan 06, 2023 11:03 pm

roddie wrote:The "Grand Illusion"..  5-15-113

Not only is the plane an awesome looking Jigger! Thumbs Up  But the stooge  with the wheel guide is excellent! I fly on my own. Hate wheels as they slow the plane and as I fly over grass a Half-A landing with wheels is a slow crash every time. So I use a drop off wheel from a stooge on a launch table. Although the stooge, single drop off wheel, and launch table work very well for me. A short wheel guide as you have done will definatley make it all a lot simpler. I will put the guide on a slide, so as that I can adjust as needed.

Thats what I love about the Forum and all of the photos people post showing what they do. The photos pass on so much more knowledge, sometimes the knowledge as in this case is inadvertant, but thats the great thing about the photos. cheers  I Love This Forum!  Thanks Heaps, great idea I would never have thought of and easy to implement. Beer Cheers

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