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Cox Engine of The Month
September-2019
Levent Suberk's

CEF Magazine cover featuring the Ex Model Engines Harpy Eagle .049



PAST WINNERS
CEF Traveling Engine

Win This Engine!
The Traveling Prop
Gallery


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Post  czarobest on Sun Sep 08, 2019 4:36 am

Hi, I would like to show you my current project. It's a bit inspired by the SkyDrill. Model is designed by me  Wink and it will be powered by an engine COX Ranger .049  Small Cox Logo  .

It is low wing model with a wingspan of about 600mm (23.62in). Wing profile is NACA2412 at root and NACA2410 at tip.

The model is mainly made of balsa, the engine fairning is made of laminate. Canopy is from PET bottle. I painted some elements with Tamiya paints and secured with two-component automotive lacquer (it's my first use the car lacquer with airbrush).

Unluckily when I covering wing with a covering film something went wrong  Sad  and I had to tear off the wing sheathing. I am currently waiting for a new foil, I hope it will come next week.

All photos from the building can be viewed here: https://photos.app.goo.gl/fTFMMDS2pcsqhqVCA
Some images from album:
CzarDrill - my first model for Cox 20190813
CzarDrill - my first model for Cox 20190814
CzarDrill - my first model for Cox 20190910

For more photos (more than 50) I invite you to the album from the link above Thumbs Up
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Post  Levent Suberk on Sun Sep 08, 2019 7:23 am

Bravo Czarek, very good model Thumbs Up cheers
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Post  roddie on Sun Sep 08, 2019 8:27 am

Nice work Czarek!
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Post  czarobest on Sun Sep 08, 2019 8:48 am

Thanks but I'm gonna find out if it's a good job after the maiden flight RC Plane
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Post  getback on Sun Sep 08, 2019 9:23 am

The build photos look great , Good documentation!!RC Plane And Welcome to the forum !!! Very Happy
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Post  NEW222 on Sun Sep 08, 2019 2:22 pm

Very nice and clean looking build.
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Post  dirk gently on Tue Sep 10, 2019 5:54 am

Did you actually fold the wing sheeting AROUND the leading edge of the wing?
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Post  czarobest on Tue Sep 10, 2019 6:16 am

Yes, already on our (pfmrc Wink ) Polish forum this was pointed out. However wing is really durable but maybe a little bit too heavy (55g (1.94 oz) without cover and servos).
By the way, today I will receive a new covering film and I will be able to cover the model Smile.

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Post  rsv1cox on Tue Sep 10, 2019 6:25 am

czarobest wrote:Yes, already on our (pfmrc Wink ) Polish forum this was pointed out. However wing is really durable but maybe a little bit too heavy (55g (1.94 oz) without cover and servos).
By the way, today I will receive a new covering film and I will be able to cover the model Smile.


Hmm, How much moisture did you use, perhaps a wetting agent like Windex?
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Post  czarobest on Tue Sep 10, 2019 6:41 am

A new post was added during editing. I'm asking the administrator to remove this post. Sorry.


Last edited by czarobest on Tue Sep 10, 2019 6:49 am; edited 1 time in total
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Post  czarobest on Tue Sep 10, 2019 6:41 am

Huh... I never heard about it. I've covered few models with HobbyKing covering film and Oracover Standard with no problems. But now I used Oracover Easycoat and it didn't work out. In my opinion this foil is not good. When shrink, the color goes off and wrinkles appear.

EDIT: Maybe I didn't understand Razz. You mean the balsa when I wraped the torsion box? If so, I moistened it with a glass cleaning spray.
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Post  rsv1cox on Tue Sep 10, 2019 6:48 am

czarobest wrote:Huh... I never heard about it. I've covered few models with HobbyKing covering film and Oracover Standard with no problems. But now I used Oracover Easycoat and it didn't work out. In my opinion this foil is not good. When shrink, the color goes off and wrinkles appear.

EDIT: Maybe I didn't understand Razz. You mean the balsa when I wraped the torsion box? If so, I moistened it with a glass cleaning spray.

Yes, that's it. Thanks it's what I use too.
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Post  getback on Tue Sep 10, 2019 10:18 am

Why the cleaner with water? Very Happy
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Post  rsv1cox on Tue Sep 10, 2019 10:27 am

getback wrote:Why the cleaner with water? Very Happy

Wetting agent, makes water more - well wet. Absorbs into the balsa and makes it more pliable without cracking within limits. Windex can stain blue but there are other options.
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Post  Levent Suberk on Tue Sep 10, 2019 11:46 am

getback wrote:Why the cleaner with water? Very Happy

Ammonia in Windex makes balsa more pliable.
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Post  czarobest on Thu Sep 12, 2019 8:03 am

Finally a covering film came to me, and I can take care of the cover.
This foil (Oracover Standard) is realy better than Oracover Easycoat. So far I covered a wing with no problems Very Happy

CzarDrill - my first model for Cox 20190911
CzarDrill - my first model for Cox 20190912
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Post  getback on Thu Sep 12, 2019 9:21 am

Came out really well man , i have never used this covering but looks good !! Very Happy
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Post  czarobest on Thu Sep 12, 2019 12:47 pm

Fuselage also covered, but now I have a dilemma whether to leave the model in red or to add a yellow strip like the one in the second photo Huh...
CzarDrill - my first model for Cox 20190914
CzarDrill - my first model for Cox 20190913
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Post  balogh on Thu Sep 12, 2019 3:51 pm

The yellow ribbon looks good but I doubt it will stay there for long under the impact of hot splashing castor oil..self adhesive  ribbons tend to stay in place shorter than heat shrinking Oracover and the like...in my experience at least
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Post  czarobest on Sat Sep 14, 2019 2:42 pm

balogh wrote:The yellow ribbon looks good but I doubt it will stay there for long under the impact of hot splashing castor oil..self adhesive  ribbons tend to stay in place shorter than heat shrinking Oracover and the like...in my experience at least

Maybe, but in theory it is Oraline and it should have the same properties as an oracover.  But we'll see about that. Smile

The model is almost finished. It's left to mount servos, engine, tank and pushers. And add some decorations Razz.
Unfortunately, the weight of the model with the equipment is 310 grams (10.93 oz.).  Plus receiver (I waiting to 3 grams receiver from China, now I have only 17 grams receiver) and plus fuel ~30g (1 oz). Which gives a total of 350 grams (12.34 oz) and a wing loading of 41 g/dm2 (~13.1 oz. / sq. ft.).

But apart from that I'm very satisfied with making a model of my own project  Very Happy

CzarDrill - my first model for Cox 20190917
CzarDrill - my first model for Cox 20190916
CzarDrill - my first model for Cox 20190915


Last edited by czarobest on Sat Sep 14, 2019 2:54 pm; edited 1 time in total
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Post  balogh on Sat Sep 14, 2019 2:52 pm

Looks great! Do not worry about the weight.My Toucan R/C weighs 400 grams empty, or 460grams fuelled and my COX TD051 flues it for more than 10 minutes a tank with nice speed and authority..
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Post  roddie on Sat Sep 14, 2019 6:09 pm

Good to see that you had better luck with the alternate covering. We never know what might work better.. unless we experiment. As Andras (Balogh) implied; don't be too concerned with the weight of the model. This is your own creation.. and I have a feeling that it will out-perform your expectations. Thumbs Up
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Post  akjgardner on Sat Sep 14, 2019 9:09 pm

Nice Build . It looks great RC Plane
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Post  NEW222 on Sun Sep 15, 2019 3:16 pm

Very nice build, and a great job on the covering.
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Post  czarobest on Mon Sep 16, 2019 10:31 am

All is mounted, screwed and configured in my radio. Unluckily I can't fit my receiver and I must have to wait to smaller one from Banggood. When it will come I'm gonna shorten the wires (from servos and BEC)

Cool things - balancing without additional ballast was almost perfect with an empty tank, with a full tank it only goes a little too far forward.

Worse things - weight Razz. Without fuel is 335 grams, with fuel ready to fly is 360 grams.

Besides the weight I am very satisfied (so far, after the flight it can be different Razz), I like it, and everything is quite well for the first own "project" I think certainly I learned something and maybe the next ones will be better Smile.

Photos of the ready to fly model Smile.

CzarDrill - my first model for Cox Czardr12
CzarDrill - my first model for Cox Post-18299-0-42424100-1568646340
CzarDrill - my first model for Cox Post-18299-0-58988800-1568646451
CzarDrill - my first model for Cox Czardr10
CzarDrill - my first model for Cox Post-18299-0-68929100-1568647237
CzarDrill - my first model for Cox Post-18299-0-13550500-1568647251
CzarDrill - my first model for Cox Post-18299-0-07301000-1568647267
CzarDrill - my first model for Cox Post-18299-0-00229300-1568647296
CzarDrill - my first model for Cox Czardr11
CzarDrill - my first model for Cox Post-18299-0-00593900-1568647309




All the previous photos from the building is in the album: https://photos.app.goo.gl/fTFMMDS2pcsqhqVCA
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