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-   -   KARAT from RT DESIGN, Build Thread by ISAAC NAJARY (https://www.rcuniverse.com/forum/rc-pattern-flying-101/11692181-karat-rt-design-build-thread-isaac-najary.html)

najary 07-30-2021 06:10 AM

KARAT from RT DESIGN, Build Thread by ISAAC NAJARY
 
Hi all

This is the eighth build thread of my build threads series:

SENSATION +, Build Thread by ISAAC NAJARY

https://cimg8.ibsrv.net/gimg/www.rcu...404581291c.jpg



FANTASISTA EVO Build Thread by ISAAC NAJARY
https://www.rcuniverse.com/forum/att...1&d=1515255446

ARIXTRA Build Thread by ISAAC NAJARY
https://www.rcuniverse.com/forum/att...1&d=1515256612

Electric ZN Line Xigris C2 Build Thread
https://www.rcuniverse.com/forum/att...1&d=1515256612

Electric Osmose Building
https://www.rcuniverse.com/forum/att...1&d=1515256612

Najarylyzer
https://www.rcuniverse.com/forum/att...1&d=1515256612

F3A Lights
https://www.rcuniverse.com/forum/att...1&d=1515256881

Best regards,

Isaac Najary

najary 07-30-2021 06:27 AM

This is all composite kit made by FalconHobby.
A lot of thinking was putting in the designing of this plane, I like it were much.
The kit quality is excellent !!!
Best regards,
Isaac Najary
https://cimg9.ibsrv.net/gimg/www.rcu...7cbe686f0e.jpg
https://cimg1.ibsrv.net/gimg/www.rcu...a4f2599255.jpg
https://cimg2.ibsrv.net/gimg/www.rcu...43e3902ff6.jpg
https://cimg3.ibsrv.net/gimg/www.rcu...90156584bb.jpg
https://cimg6.ibsrv.net/gimg/www.rcu...1678d4ed22.jpg

Best regards,
Isaac Najary


Goodie_2_Shoes 07-30-2021 10:30 PM

Looking forward to this one! I've been assembling two Karats for quite some time now. One of them is pretty ready for paint and hopefully I'll have it painted when the weather warms up.

najary 07-31-2021 12:14 AM

The first thing that I always do when starting a new project is weighing the kit parts.

Isaac Najary

https://cimg0.ibsrv.net/gimg/www.rcu...20a96d8ea4.jpg
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https://cimg0.ibsrv.net/gimg/www.rcu...18b63fdb82.jpg

najary 07-31-2021 12:18 AM

2 Attachment(s)
The second thing is writing an Excel worksheet with all the parts weights and the moments from the planning C.G.

The moments are used to know in advance where the motor battery tray will be and how much the battery should be moved in order to move the C.G. 1 cm' so the battery tray can be planned properly.

In glow planes, one can know in advance, if the plane is going to be tail or nose heavy and try to eliminate the problem.

I update the Excel during the course of the building process with the actual weights and mark them in green.

The KARAT Excel enclosed herewith,

Sorry for the Hebrew,

Best regards,

Isaac Najary

Flowmotion 07-31-2021 02:06 AM

Hello Isaac,
interesting report, I will follow it closely.
But too bad I don't know Hebrew.
Can you please give the total bodyshell weight of the model in grams. I think that would help not only me, but also quite a few others.
Greetings
Gerhard

najary 07-31-2021 11:31 PM


Originally Posted by Flowmotion (Post 12688076)
Hello Isaac,
interesting report, I will follow it closely.
But too bad I don't know Hebrew.
Can you please give the total bodyshell weight of the model in grams. I think that would help not only me, but also quite a few others.
Greetings
Gerhard

Hu Gerhard,
That is why I put picture of all the kit parts so you can calculate the weight by yourself.
Best regards,
Isaac Najary

najary 08-03-2021 02:53 AM

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najary 08-04-2021 10:59 PM

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najary 08-06-2021 11:15 PM

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najary 08-08-2021 08:44 AM

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najary 08-08-2021 08:48 AM

From :
https://vlvinternational.square.site/s/shop

https://cimg8.ibsrv.net/gimg/www.rcu...ffee86683d.jpg
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Ricardo M. 08-13-2021 04:47 PM

Great Isaac, been long since your last build thread. Looking forward to see the progress and your master piece craftmanship.

najary 08-15-2021 05:50 AM

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najary 08-17-2021 08:57 AM

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najary 08-18-2021 08:58 PM

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najary 08-21-2021 10:14 PM

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najary 08-23-2021 10:54 PM

Clear canopy and the pilot add 50 gram to the plane.


https://cimg1.ibsrv.net/gimg/www.rcu...95acff5fdb.jpg
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najary 08-25-2021 03:20 AM

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najary 08-26-2021 08:50 AM

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najary 08-26-2021 09:03 AM

After only 26 days, the plane is ready for the painting process!!!
I have to say that this plane is top top quality, everything is super straight and the money value is excellent.
https://falconhobby.eu/en/modell/58/...EszqgOKmh4GpKo

https://cimg2.ibsrv.net/gimg/www.rcu...e23d35da83.jpg
https://cimg3.ibsrv.net/gimg/www.rcu...efac36b2a3.jpg

najary 08-27-2021 06:55 AM

Weights before the finish process
https://cimg3.ibsrv.net/gimg/www.rcu...66f32fdfae.jpg
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najary 08-27-2021 06:58 AM

KARAT finish process - step 1
https://cimg2.ibsrv.net/gimg/www.rcu...e18b94e2e4.jpg
https://cimg9.ibsrv.net/gimg/www.rcu...0c97b5ce33.jpg
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najary 08-29-2021 07:47 AM

KARAT finish process - step 2
https://cimg3.ibsrv.net/gimg/www.rcu...e3e5d5db48.jpg
https://cimg2.ibsrv.net/gimg/www.rcu...b205b9771f.jpg

bandicootf16 09-06-2021 02:41 PM

Nice work Isaac
Does the Karat have have any wing stagger. Most designs seem to have some positive stagger but looking at the interplane strut arrangement on the Karat it may have no stagger or possibly negative stagger. While positive stagger may improve lift efficiency this doesn’t make sense with an aircraft that spends half it’s time inverted where positive then becomes negative stagger. I guess the best arrangement would be zero stagger. Maybe aerodynamically stagger doesn’t matter that much and then it just becomes a style issue, where a little positive stagger “looks nice” when the model is sitting on the ground and it looks right.


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