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« on: February 09, 2013, 12:05:46 PM »
arun.sreelakam
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Here is my anther coro build.. After success full build of 50" Coro trainer,
This time I Made a pusher One... My own dimensions But Looks from another Small plane from rcgroups..

Electronics used

motor : turnigy 2826 2200kv
prop   :5x5E
Lipo    : 900mah 3s
Esc     : 35A
WS     : 35"
fuse    : Thermocol with tissue covering
Spars   : carbon rod 4mm for tail, 3mm as wing spars

overall weight  350gms
Done glide test, and going to maiden soon...

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Homebuilt Coro pusher Plane
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« Reply #1 on: February 09, 2013, 12:15:41 PM »
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 Clap Clap Clap Clap Clap Clap Clap Clap Clap Clap Salute Salute Salute Salute superb looking bro all the best
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« Reply #2 on: February 09, 2013, 12:25:26 PM »
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arun
nice build, look at basic aerodynamics thread,

line joining Leading to trailing edge is the chord line, you chord line is negative 3-4 deg. she will go nose down badly. you need to rectify that
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« Reply #3 on: February 09, 2013, 12:25:37 PM »
arun.sreelakam
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Thanks yaar actually i need to give some more support to the wings currently working on that..
 Smiley Smiley Smiley
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« Reply #4 on: February 09, 2013, 12:29:19 PM »
arun.sreelakam
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arun
nice build, look at basic aerodynamics thread,

line joining Leading to trailing edge is the chord line, you chord line is negative 3-4 deg. she will go nose down badly. you need to rectify that
Sir Are you pointing me about the fuse chord is a bit facing upwards?
Done The glide test Right now didn't find any Nose heavy feeling..
I will check it out and Try to adjust thanks for The critics sir.. Smiley
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« Reply #5 on: February 09, 2013, 03:13:44 PM »
arun.sreelakam
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Added some support for the wings and tail...  Roll Eyes
Not its more stable...  Grin Grin

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« Reply #6 on: February 09, 2013, 03:32:08 PM »
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Arun

I think what Gusty sir is trying to explain is that your wing and horizontal stabilizer are not parallel. You have a negative angle of incidence which would give the plane in powered flight a nose-down tendency. Frankly I can not make out from the pictures, but look at it from the back with one eye, model as far away as you can hold, and from side-on. If this condition exists, you would be well advised to correct before flying.

That's my 2 cents worth!  Discuss

Nonetheless,  Good job
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« Reply #7 on: February 09, 2013, 03:38:42 PM »
arun.sreelakam
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Sir as I am using  CF tube as the fuselage when i place it in ground the cf tube will twist a bit with the weight of the wings and thats what happend in that picture..  But when i keep it in hand the wing is parallel to the tail.. Angry Angry
Anyway i am gonna fly it... Sad afetr the support the wings are much stable now...
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« Reply #8 on: February 09, 2013, 03:42:56 PM »
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Good Luck, all the best. Looking forward to the video
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« Reply #9 on: February 10, 2013, 07:24:52 AM »
arun.sreelakam
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Thanks a lot sanjay sir Its really windy here in kerala,
Dont know will update soon after the maiden..  Thumbs Up
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« Reply #10 on: February 10, 2013, 07:47:20 AM »
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This is what i meant by wing is sitting at -ve incidence, though it might appear that the wing is straight, it is not, because the chord line along which the lift will act is a line joining the LE radius to TE radius. See image. like i said read further on Basic AD thread

See image

another question

is she balancing at 25% chord?, to me it appears all your mass appear to lie behind 25% and not much really ahead. not to mention the Tail Volume.

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Re: Homebuilt Coro pusher Plane
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« Reply #11 on: February 10, 2013, 01:46:59 PM »
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Sir I got you now  Smiley
After the installation of extra support the wings are more straight now..
But sir i am getting CG about 30%-35% chord and i have added the lipo in the very nose part to get good balance and as it is about +50gms weight... Smiley
My intention was to Add some weight in the nose after the glide test but the glide test went fine as i never expect..  Giggle
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« Reply #12 on: February 10, 2013, 10:37:55 PM »
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Use Single coro technic for the wing stated earlier by me with the jointing procedure.
http://www.rcindia.org/electric-planes/coro-wing-design-new-try/?action=dlattach;attach=649221;image
Homebuilt Coro pusher Plane

If you are making it as puller (Rudder and elevator as nose and wing at back), then the wing produce lift, else when the plane forwards, it will move the air upward and it just go downward. Else to produce lift, you have to give elevator trim and it will fly like hovering. Grin

Here is the thread
http://www.rcindia.org/electric-planes/coro-wing-design-new-try/

Please please read the basic aerodynamics thread as adviced to save costly electronics.
Commercial airplanes are tilted 5-15 O maximum. So, it will look odd.
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« Reply #13 on: February 10, 2013, 11:22:56 PM »
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Kalyan Da, the process is very elegant but that is too cambered. It will create more drag, it will cause the flow to separate downstream and since the leading edge is sharp(unlike an actual airfoil), it may also cause leading edge flow separation.

At very high speed and at high angle of attack, the sharp edge will generate vortices producing lift even at those extreme angles(that is fighter planes have sharp leading edges). But at low speed, a smooth airfoil will give better results.

Arun, you should follow rcpilotacro's suggestions. That leading edge looks more like a leading edge flap in this configuration.
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« Reply #14 on: February 11, 2013, 06:33:48 AM »
arun.sreelakam
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@kalyan sir: Sir saw your design, will make another wing like your's...
Thanks for your help..  Smiley
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« Reply #15 on: February 11, 2013, 06:39:26 AM »
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Kalyan Da, the process is very elegant but that is too cambered. It will create more drag, it will cause the flow to separate downstream and since the leading edge is sharp(unlike an actual airfoil), it may also cause leading edge flow separation.

At very high speed and at high angle of attack, the sharp edge will generate vortices producing lift even at those extreme angles(that is fighter planes have sharp leading edges). But at low speed, a smooth airfoil will give better results.

Arun, you should follow rcpilotacro's suggestions. That leading edge looks more like a leading edge flap in this configuration.

Sir actually i have rectified the Chord line already as rcpilotacro sir, But decided to make a new wing as of kalyan sir's design, It looks more good for me too now.. It was build just for a fun two days before...
I would have maiden but it was too windy here which saved my electronics.. Smiley
Thanks for your help rohith sir
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« Reply #16 on: February 11, 2013, 01:40:22 PM »
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hello Kalyan ji,

I understood the technique to bend coro.... what should be the ideal under-cambered wing aerofoil shape.....is it similar to the aerofoils ---- upper surface only... and what should be the angle of incidence.
 
Is the attached image fine...

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« Reply #17 on: February 12, 2013, 02:32:35 PM »
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The single coro wing will be equivalent with the flat bottom wing with the top simulated as shown in the picture, just with some less drag and less strength, less weight. Moreover, the sharp square leading edge sometimes starts flapping and so the leading edge is to be rounded with clear tape(or any other method). I made 24" wingspan 400Gm AUW with 1/2" folded to achieve rounded leading edge and flies grate.

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Re: Homebuilt Coro pusher Plane
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« Reply #18 on: February 12, 2013, 04:04:47 PM »
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Only a THIN AIRFOIL can be considered equivalent to its camber line and infact this is what is done in the Thin Airfoil Theory to calculate the lift and other airfoil parameters. However, thick airfoils cannot be replaced by camber lines.

But the thin airfoil theory does not take into account the viscosity of the fluid and hence does not predict flow separation. Also a camber line airfoil will produce lower lift than its equivalent airfoil.

Take an example of a symmetric airfoil whose camber line is straight line, now look at the lift vs angle of attack values for a flat plate, then look at the lift vs angle of attack of the symmetric airfoil(in this case the NACA 0012). You can clearly see that the flat plate gives a maximum Cl of about 0.7 whereas the symmetric airfoil gives you about 1.2. Also the flat plate starts stalling at about 8 degrees angle of attack whereas the airfoil goes upto about 11 degrees.

Therefore, since the flow begins to separate earlier for the flat plate, it is going produce much MORE DRAG than its equivalent airfoil(at zero angle of attack though, the flat plate will have lower drag).

Therefore IMHO, a camber line is never an equivalent of the corresponding airfoil, it is always better to have an airfoil otherwise we would be seeing camber lines in all the planes around us.

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« Reply #19 on: February 12, 2013, 04:24:53 PM »
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Hello rohit,

Understood the point you made... can you give an ideal ( practical) under-cambered aero foil for a slow fly plane and top view of wing.
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« Reply #20 on: February 12, 2013, 10:13:40 PM »
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Well, a clark y airfoil(google it!) is always a safe bet. It has very good performance at the Re at which model aircrafts fly. So you can use that. If you want to build a slow flying plane, then you should have wings with AR(wingspan/chord) about 8-15. The larger the AR the better(look at pictures of glider wings and you will understand).

Also try to keep the wing loading(Weight of the airplane/wing area) low for better glide performance and to have a lower stall speed so that you can fly at lower speeds without stalling.

Then the AR of the horizontal tail should be around 3-4(always keep it less than the wing), lower aspect ratio wings stall at higher angle of attacks. Hence even if your wing stalls, you will still have control of the tail. There are lots of details that follow, one needs to read a lot.(Ofcourse it was easy for me, because I had taken Airplane performance and design in my previous semester. Cheesy)
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« Reply #21 on: February 12, 2013, 10:41:22 PM »
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here is the Clark y aeroplane

http://www.rcindia.org/gas-glow-nitro-planes/50cy-scratch-built-50-cc-high-winger/


read this too

http://www.rcindia.org/rc-general-topics/basic-aerodynamics-for-rc-flying/msg115570/#msg115570
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« Reply #22 on: February 12, 2013, 10:49:40 PM »
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the Re  

Reylonds Number

.. you should have wings with AR
AR=Aspect Ratio= span/mean chord  or span2/wing area

read http://en.wikipedia.org/wiki/Aspect_ratio_(wing)


Rohit  KISS Grin


http://en.wikipedia.org/wiki/KISS_principle
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« Reply #23 on: February 12, 2013, 10:51:22 PM »
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Thanks rohit for the explanation.

The data and the graph as actual. From your wind tunnel experiment surely.
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« Reply #24 on: February 12, 2013, 10:55:52 PM »
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Too much of homework by teacher's........
well as a good student I will read and then ask questions.....
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