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« on: December 23, 2012, 08:57:02 PM »
santhosh-r
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Dear friends,
I am a begginer in RC planes.
Now I am building a RC coro trainer and I would like to share the build Photos.
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« Reply #1 on: December 23, 2012, 09:10:35 PM »
arun.sreelakam
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santhosh where are you in coimbatore..?
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« Reply #2 on: December 23, 2012, 09:23:06 PM »
santhosh-r
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I am from Sundarapuram,Coimbatore
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« Reply #3 on: December 23, 2012, 09:30:17 PM »
santhosh-r
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The materials used are
Motor
Turnigy 1250kv 500W motor
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=18227
ESC
Turnigy Trust 45A SBEC ESC
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=12191
Battery
Turnigy 3S 2200mAh 20C lipoly
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8932

Servos
3 x Hobbyking standard servos
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=16269

Control horns ,clevis
From hobbyking
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8611
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8639

Control rod,
bicycle spokes

3mm Coroplast
3mm Plywood
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« Reply #4 on: December 23, 2012, 11:00:22 PM »
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Welcome Smiley  Looking forward to the pictures !
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« Reply #5 on: December 24, 2012, 08:41:23 AM »
arun.sreelakam
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38g servos for trainer?  Angry Angry
so whats the wingspan and length?  Head Scratching Head Scratching
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« Reply #6 on: December 24, 2012, 08:50:18 AM »
santhosh-r
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Thanks Mr.Anwar

BTW the wingspan is about 52" with 7 degree dihedral.
I chose the standard servos because the motor is 500W and can provide enough thrust.
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« Reply #7 on: December 24, 2012, 08:51:19 AM »
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The length is 38".
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« Reply #8 on: December 24, 2012, 09:47:42 AM »
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yaar i think these power system will be much heavier for your model.. Head Scratching Head Scratching
what is the AUW you are expecting? Huh? Huh?
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« Reply #9 on: December 24, 2012, 10:22:19 AM »
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AUW is approx . 1.5KG
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« Reply #10 on: December 24, 2012, 10:30:37 AM »
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 Shocked Shocked whooo.. thats pretty heavy i think.. my trainer of 50" span weighs 400gms(inc battery).. and your motor has only 1250gms of thrust..
better wait for the seniors to talk about this.. 
this is my trainer
http://www.rcindia.org/electric-planes/home-made-coro-trainer-plane-50'-span/msg117896/#msg117896
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« Reply #11 on: December 24, 2012, 11:04:49 AM »
sanjayrai55
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Don't wake a Tiger until you've factored the teeth
Arun, I am relatively new in Electrics,and please correct me if wrong, but I would think that if e.g. you use a 1250 g thrust with a 1250 g model, it will be capable of climbing vertically. In that case, for normal (read trainer) flying, this motor should be capable of handling say a 2 Kg model? Looking forward to some insights from people more knowledgeable than myself.
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« Reply #12 on: December 24, 2012, 02:23:30 PM »
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Arun - I think trainers need only 50 - 75 watts/lb i.e. approx 100 - 150 watts/Kg .Please correct me if I am wrong.Also I am building it as per a plan given by my friend from Sharma models and it stated it needs only 300watts motor.
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« Reply #13 on: December 24, 2012, 04:07:15 PM »
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@sanjay: actually i bought a aeolian 1700kv(c3530) motor first which can lift about 1.2kg and installed in my trainer that was nose heavy, then i added some tail weight and fled which flies good but as i am a beginner it was really hard to control, and crashed...Then i moved to the less kv and less watt motor which can handle 700gms or so, then i felt the difference that flying it is really easier than my first model.
Here it may fly good, but decreasing the weight will reduce the damage while crashes..
This is in my view please forgive me if i am wrong.. Smiley
 Tongue Tongue Tongue
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« Reply #14 on: December 24, 2012, 04:23:08 PM »
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Don't wake a Tiger until you've factored the teeth
Arun, you are correct when you say that heavier model crashes create more damage. Heavier (and larger) models I would feel have their own advantages and disadvantages: easier to see in the air, better handling in wind. I have crashed (quite a few times!) a Spadet Corro model, about 2.6~2.8 Kg, but, unlike Balsa, it bounced Smiley

As the saying goes, crash enough balsa models, and you'll have a tree growing, but you can't plant plastic (although I have tried many times Cheesy
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« Reply #15 on: December 24, 2012, 04:28:27 PM »
sanjayrai55
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Don't wake a Tiger until you've factored the teeth
I guess the important thing is AUW should be in proportion to the model size. I am just completing a SPAD with a span of 44", chord 12", length 32". With full Landing Gear and a 3300 mah battery it will weigh 1.3 to 1.4 Kg, or 3 lbs. Let's see how it flies! Head Scratching

Still looking forward to some expert views on thrust vs model weight  Undecided
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« Reply #16 on: December 24, 2012, 04:49:02 PM »
arun.sreelakam
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sanjay sir i think i have got more crashing experience  than yours..  Giggle Giggle
done about 8-10 crashed till today.. including the one which happend on my birthday..  >Cheesy
the next flying will be this Saturday.. lets see whats gonna to happen.. Smiley
anyway all the best for your build and waiting to see the pictures..  Thumbs Up Thumbs Up Thumbs Up
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« Reply #17 on: December 24, 2012, 04:53:39 PM »
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Don't wake a Tiger until you've factored the teeth
Good luck for Saturday, Arun

Santosh: post photos...Smiley
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« Reply #18 on: December 24, 2012, 09:56:53 PM »
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Sanjay sir here are the photos,
Items ordered from hobby king.
Plan on coroplast.
Fuselage cut out.
Elevator and rudder.
RC_TRAINER_001.jpg
Re: Coro trainer - electric - build log
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« Reply #19 on: December 24, 2012, 09:58:36 PM »
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Some more photos.
RC_TRAINER_011.jpg
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« Reply #20 on: December 24, 2012, 10:00:15 PM »
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And some more
Art on horizontal stabliser by my friend Sakthi
RC_TRAINER_028.jpg
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« Reply #21 on: December 24, 2012, 10:02:36 PM »
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Pom horns fixed
Control rod made of bicycle spokes and dowel rod.
RC_TRAINER_049.jpg
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« Reply #22 on: December 24, 2012, 10:04:47 PM »
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servos mounted.
Making of wings from 3mm plywood
RC_TRAINER_066.jpg
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« Reply #23 on: December 24, 2012, 10:07:08 PM »
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Model almost finished with landing gear.
RC_TRAINER_083.jpg
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« Reply #24 on: December 24, 2012, 10:08:43 PM »
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My spektrum 6 channel Rx.
Dihedral cut out from 3mm plywood
RC_TRAINER_092.jpg
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