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Post  MauricioB Sat Apr 03, 2021 12:12 am

Friends of CEF, I am pleased to share this beautiful model.
This model has its story and I want to share it with you.
Shortly its previous owner, Mr. Roberto Ishkanian, will tell us about the origin of this creation… so soon I will retransmit Roberto's words, for now I will leave you some photos of this beautiful jewel!
Corky, a beautiful model who asks for heaven! 20210413
Corky, a beautiful model who asks for heaven! 20210410
Corky, a beautiful model who asks for heaven! 20210411
Corky, a beautiful model who asks for heaven! 20210412
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Post  Kim Sat Apr 03, 2021 9:47 am

Beautiful Plane!!!!
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Post  getback Sat Apr 03, 2021 10:02 am

NICE !!! is that the Bob Smith of the CA Glues , maybe that's the glue they used and gets his advertisement on the plane ?
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Post  OVERLORD Sat Apr 03, 2021 10:38 am

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Post  MauricioB Sat Apr 03, 2021 1:15 pm

thanks guys for leaving your comments! ....
I will be answering any query that arises here.
As I promised you, my friend Roberto Ishkanian, has written the history of this impeccably finished model ... well, let the story begin to discover each step of this wonderful model aircraft ... there we go!

Roberto tells us:
In 1998 I built this biplane to present it in a traditional 1/2A meeting at a club in Buenos Aires. It is based on the "Corky" designed by Van Hereford, published in Model Airplane News (November 1963). Today the plan and article can be easily obtained from the Outherzone website (plan oz2937).

The original “Corky” has a 28-inch wingspan and was designed for Free Flight with a Cox Pee Wee .020 engine, with both wings made of curved balsa sheet with false ribs. My version is exactly the same size, but I adapted it to fit a reed valve Cox .049 and a Cox-Sanwa 2-channel radio. Both wings are ribbed and plated above and below, forming an approximate Clark-Y profile. I also made other modifications, such as the addition of the lateral wing pillars, and two front air intakes that allow the engine crankcase to be cooled.

The wings were finished with the original MonoKote, while the fuselage and tail group were finished with dope and then with LusterKote spray paint (from Top-Flite), with the colors matching those of the MonoKote. Although I have not checked the weight on a scale, I can say that it turned out to be a very light model. This is because I took a lot of time selecting the wood, using the lightest balsa I could get.

A special comment about the incidences: the engine is approximately 1 degree negative, the stabilizer is at zero degrees, the lower wing is also at zero degrees, but the upper wing is 1 degree positive. This responds to a very effective concept for biplanes that are not designed for aerobatics, but for a very safe sport flight. The theory goes that when the front wing (in this case the upper wing) is stalling, the lower wing is still maintaining lift but with the CG almost at its leading edge. Therefore, at that moment the model lowers its nose without getting out of control, and thus there is a better chance of recovering normal flight.

Remember: in the biplane models the front wing should have 1 to 1,5 degree more positive than the rear wing to obtain this "saving effect". In the case of the Beechcraft Staggerwing the lower wing is forward, but in most biplanes the upper wing is forward, and is the one that needs the most positive incidence. Also remember not to consider this concept for aerobatic biplanes.

In that year 1998 I worked on the model all night before the meeting, and without sleeping I went to the field and arrived in time to present it. When I was given permission to use my frequency (72.080 MHz) I discovered a problem in my Cox .049 motor. When it started, a couple of seconds later it stopped. Then I realized that when I assembled the engine during the early morning, I forgot to put that little O-Ring in the metal conduit that goes behind the reed valve. There was nothing I could do at the field, and I only displayed my biplane in static mode.

That day I thought about saving the model and presenting it at the 1/2A meeting the following year, but due to lack of time and other reasons, the model hung on a wall for almost 22 years. During 2020 I decided to sell it, and its new owner is Diego Ochoa (from Venado Tuerto, Santa Fe, Argentina), and my good friend Mauricio Bertello is preparing it to fly. But Mauricio is improving it, as he installed a third servo for throttle control on the Cox engine. This is really good because in my version it only used 2 channels, and all the landings would have been in glide (that is, in emergency). But now with the throttle control manufactured by Mauricio, the landing can already be made when the pilot so decides.

I am looking forward to seeing the results of this model in flight.

Good flights!

Roberto Ishkanian
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Post  MauricioB Sat Apr 03, 2021 1:26 pm

Diego Ochoa, a friend and current owner of the model, has trusted to leave me this jewel to install it and prepare it to be thrown into the air ... surely Diego will also leave us a comment ... as you can see ... the Aeromodelling unites passions .... and this model has had the patience of waiting 20 and more years before flying! ....
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Corky, a beautiful model who asks for heaven! Empty Gracias Roberto y Mauricio

Post  dochoa Sat Apr 03, 2021 11:48 pm

Es muy gratificante poder ver las imágenes presentadas por Mauricio, y la historia contada por Roberto, su constructor!!
Para quienes no lo saben, Roberto tiene un programa de TV llamado Hobby Show desde hace años. Hace un tiempo largo ya, venia mirando y enamorándome de ese avión, el cual Roberto solía presentar en sus programas, sin saber que había alguien al acecho jajaja
Este verano, conversando con Mauricio, le comente de mi gusto por ese avión y el accedió gentilmente a consultarle a Roberto si estaba la posibilidad de venderlo. Y así fue, logre conseguirlo.
No tengo dudas de lo que debe haber sentido Roberto al desprenderse de el, su viejo compañero!
Una vez en casa, me limitaba a contemplarlo, sabiendo que para ponerlo en vuelo, iba a tener que hacer un esfuerzo gigante, para honrar a su constructor.
La traba mas grande para mi, era lograr un tanque de combustible apto para el espacio que disponía, pero sabia que era un gran desafío.
Días atrás en el club, conversando con Mauricio, y contándole la situación, el accedió gentilmente a no solo hacerle un tanque, sino también colocar el motor y servo de acelerador.
Conociendo su basta experiencia, buen gusto y amor por este hermoso Hobby, no dude en ponerlo en sus manos, y el resultado fue el que esperaba, un bellísimo avión, construido por un Experto como Roberto, y motorizado y puesto a punto por otro Experto como Mauricio.
No tengo palabras para agradecerles a ambos, y no veo la hora de poder volarlo y compartir con ustedes el video!!
Les dejo cordiales saludos y muchas gracias, Diego  RC Plane  RC Plane  Airplane


Translation (via Google translate)
It is very gratifying to be able to see the images presented by Mauricio, and the story told by Roberto, its builder !!
For those who don't know, Roberto has had a TV show called Hobby Show for years. A long time ago, I had been looking and falling in love with that plane, which Roberto used to present in his programs, without knowing that there was someone lurking hahaha
This summer, talking with Mauricio, I told him about my liking for that plane and he graciously agreed to ask Roberto if he was able to sell it. And so it was, he managed to get it.
I have no doubts about what Roberto must have felt when he let go of him, his old companion!
Once home, I just stared at it, knowing that to put it into flight, I was going to have to make a gigantic effort, to honor the builder of it.
The biggest obstacle for me was to achieve a fuel tank suitable for the space I had, but I knew it was a great challenge.
Days ago at the club, talking with Mauricio, and telling him about the situation, he graciously agreed to not only make a tank, but also place the motor and throttle servo.
Knowing your vast experience, good taste and love for this beautiful Hobby, do not hesitate to put it in your hands, and the result was what you expected, a beautiful plane, built by an Expert like Roberto, and motorized and tuned by another Expert. like Mauricio.
I have no words to thank you both, and I can't wait to fly it and share the video with you !!
I leave you cordial greetings and thank you very much, Diego


Last edited by Admin on Sun Apr 04, 2021 12:34 am; edited 1 time in total (Reason for editing : added translation)
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Post  MauricioB Sun Apr 04, 2021 1:46 am

Thank you very much Diego for your words, I know what you love about this model and I am giving it a lot of attention so that it is very gratifying to fly and enjoy it.
I send you a big hug!
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Post  MauricioB Sun Apr 04, 2021 2:16 am

Well now I comment on the little jobs I did on the model and the respective photos.
1 Fit a .049 Babe Bee motor with flaper valve.
2 Install the throttle ring and corresponding drive servo.
3 Fabricate a fuel tank to perfectly match the available shape of the fuselage.
4 Reshape the lower cover of the tank and engine, cutting a circle so that the throttle ring can work without problems.
5 Fit the ignition key.
6 Place the battery by means of the strap, which should be removed in case of recharging.
7 Control the CG Center of Gravity, leaving it with a nose drop of about 15 degrees.
8 I changed the wheels, since the original ones of the engine disintegrate over the years, manufacturing jujes for the correct sliding of each tire.
9 I added a few touches of paint to finish the interior.
place the receiver.
10 Finally I checked the weight of the model, which is about 520 grams.
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Post  MauricioB Sun Apr 04, 2021 2:47 am

Friends and Diego in particular, your model is ready to test ... at 02:45 am, the workshop work has been finished! ... we will see what happens on the track! Eyebrows Eyebrows
Corky, a beautiful model who asks for heaven! Dsc04919

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Post  balogh Sun Apr 04, 2021 3:36 am

Beautiful job Mauricio...I like the engine cowl design very much. The engine may need a high compression or turbo head because 520 gram is not small load for a Bee to haul it from the runway?
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Post  KariFS Sun Apr 04, 2021 4:21 am

Beautiful model indeed!

Very nice job on the overhaul, Mauricio! I like the way you pay attention even to the smallest details (like the wheel bearings) and make everything look nice as well as functional.

I am sure both of your friends will be proud to see this model fly. Roberto as the builder, Diego as the new owner and you too, being the ”catalyst”, making it all possible.

Thank You for sharing this story!
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Post  OVERLORD Sun Apr 04, 2021 4:22 am

Great overhaul!! I like the colours, very sporty
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Post  getback Sun Apr 04, 2021 9:12 am

Very Nice story and rebuild of a model for friends alike in the hobby ,, You and your friends amaze me at how you speak with the highest authority to each other , just something you rarely hear of anymore OR i am hanging with the wrong people Laughing Thanks for the history it means alot in knowing were the model plane has been and who have touched it . Mauricio you have done another fantastic job on getting the bipe ready for the sky and Fun times ahead Big hugs from me to you friend !! Beer Cheers watching for a great maiden flight Popcorn
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Post  MauricioB Sun Apr 04, 2021 12:04 pm

@getback wrote:NICE !!! is that the Bob Smith of the CA Glues , maybe that's the glue they used and gets his advertisement on the plane ?
Ask Roberto about your concern, he tells me that he does not remember exactly because many years ago, but that it may have to do with the glue.
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Post  MauricioB Sun Apr 04, 2021 12:07 pm

@balogh wrote:Beautiful job Mauricio...I like the engine cowl design very much. The engine may need a high compression or turbo head because 520 gram is not small load for a Bee to haul it from the runway?

Thanks András, really and with the experience of other models, I think you can take it off the ground well. The issue now is that the grass on the track is a little higher and we have to see if it is possible for the wheels to slide without braking, but it will be a matter of going to test shortly!
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Post  MauricioB Sun Apr 04, 2021 12:08 pm

Thank you Kari for your words ... hug for you!!
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Post  MauricioB Sun Apr 04, 2021 12:10 pm

Thank you overlord !, very kind !
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Post  MauricioB Sun Apr 04, 2021 12:18 pm

Eric !, thank you for your words.
I know many people, each with their ideas. With those people who maintain respect and appreciation for the other, I have built friendship and it remains in time.
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Post  NEW222 Mon Apr 05, 2021 2:00 pm

That is sure one beautiful looking and built biplane they your friend has there. I was very shocked to see an .049 in the cowl after looking at the two first pictures. I thought it was much bigger than what it was said to be a post or two later. I am also sure it will fly just great after the little things you had done to it, as you do things very nice and clean with much attention to detail. I too will love to see and hear how your maiden flight of the airplane goes.
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Post  MauricioB Tue Apr 06, 2021 12:09 am

Small Cox Logo Small Cox Logo Friends! ... I have the very good news that the Corky model aircraft has been a SUCCESS! Diego has flown it wonderfully.
The model responds very well.
Surely Diego will leave us his comment .... in the meantime he left you a flight video, I hope you enjoy it !!
Thanks to all of you for being there, take care! good health to all !! Small Cox Logo Small Cox Logo

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Post  NEW222 Tue Apr 06, 2021 1:56 am

Great flight and the choice of music is also good. I really like that song. However, I am still in disbelief about the Corky. Until hands are in the picture and video, it sure looks like a big plane. A wonderful job done by all of you. The original builder, you for the work you did on it, and your friend for the flight. You should all be proud!
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Post  dochoa Tue Apr 06, 2021 8:14 am

Buen dia a todos!!

Antes que nada y por sobre todas las cosas, quiero agradecerles a todos por estar pendientes y sus palabras.
Hemos pasado una gran tarde, como habitualmente lo hacemos junto a Mauricio, volando el Corky y otros aeromodelos.
Realmente todo salio perfecto, la construccion, seteo, vuelo y despues de 22 años este modelo pudo ir el sitio para donde nacio, el aire!
El vuelo es muy docil, y los aterrizajes tambien lo son. Espero pronto un nuevo dia en el club para seguir disfrutandolo junto a Mauricio.

Cordials saludos a todos y gracias!!!! Very Happy RC Plane RC Plane RC Plane

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Post  nico010 Tue Apr 06, 2021 7:14 pm

beautiful model..beautiful flight..beautiful flying field!!!!
a big greeting from Corrientes (Argentina) for the friends of the cox engine forum and the friends from Venado Tuerto (Santa Fe Argentina !!)
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Post  getback Wed Apr 07, 2021 10:25 am

Nice stable flight , the plane really looks a lot better after the changes and clean up . Friends helping Friends is what it is all about. Hand Shake sunny Beers
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