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« on: February 26, 2012, 06:57:14 PM »
rcpilotacro
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Watch out this space for Build and Fly Log of Su-47 Berkut. here is the video of the real Berkut

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Gusty's Hangar and Introduction.

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A Great pilot will practice until he canít get it wrong.
 

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« Reply #1 on: February 26, 2012, 07:02:22 PM »
rcpilotacro
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Full plans here (Including A4 Tiled, decals etc)
http://www.parkjets.com/storage/SU-47%20BERKUT.zip
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Gusty's Hangar and Introduction.

A Good pilot will practice until he gets it right,
A Great pilot will practice until he canít get it wrong.
 

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« Reply #2 on: February 26, 2012, 07:30:16 PM »
rcpilotacro
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Few points to keep in mind are

(a) will require cross covering cf 1x3mm strip from tip to root (See image), or else yo will end up like this (http://www.rcindia.org/rc-general-topics/basic-aerodynamics-for-rc-flying/msg90970/#msg90970)

(b) CG could lie outside the wing this one is a perfect example of that, you will see in the flying videos, when she bunts slowly, she will kinda nose down and float up, where should the CG be ? see image

(c) contrary to common belief , swept forward wings for the same span, control area and throw, rolls shade slowly, so ? elevon throw has to be more, if you are connecting it to the same servo but at different servo holes then choose the upper one for the Ailevons and lower for the tailerons. opposite of what is shown in the image

(d) Fuselage lift constitutes > 60% of the total lift, it is imperative that you cut and stick as per plan, in the plan you will notice the nose is drooping down, this is to allow the fuselage to act like an aerofoil and the lift to get generated

(e) fin is small that is because the spanwise flow in the swept forward wing comes inwards and discharges at the wing root, this will allow fin to be in the airflow zone all the time, high alpha directional stability should be good, will report this after the flight report

(f) Placed well, this is a one sheet aeroplane (like the MiG 29 ) see image for my layout

PS
anybody building along ?

Berkut.jpg
Re: Su-47 Berkut:- Tomhe Plans;- Build and Fly Log
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Gusty's Hangar and Introduction.

A Good pilot will practice until he gets it right,
A Great pilot will practice until he canít get it wrong.
 

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« Reply #3 on: May 28, 2012, 11:10:48 PM »
vikalp11
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Hello Sir,
Has the build gone any further?
Would like to see this .....interesting craft!
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« Reply #4 on: May 29, 2012, 12:13:12 AM »
roopeshkrishna
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Sir.. its an awesome build.. Hats Off Hats Off Hats Off
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« Reply #5 on: May 29, 2012, 05:51:14 AM »
rcpilotacro
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she flew extremely docile owing to very small elevator surface so changed it to a bigger one, wasn't happy at all with the performance i look for >Cheesy, therefore will build another one. will upload video soon
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Gusty's Hangar and Introduction.

A Good pilot will practice until he gets it right,
A Great pilot will practice until he canít get it wrong.
 

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« Reply #6 on: May 29, 2012, 04:15:04 PM »
roopeshkrishna
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 Salute Salute Salute
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« Reply #7 on: May 29, 2012, 08:45:47 PM »
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ok sir
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