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« on: September 11, 2010, 12:25:06 PM »
xxkrishxx
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Hi friends I was searching a trainer for teaching me balsa building but now going for a coro plane.Started building my first coro trainer from plans.Besides my work n exam preparation I'm hardly getting time for building,so I don't know when I'll finish this one.uploading build pics.
Specs:
Material: 3mm coro for everything
Wing span: 1250mm
Fuse length: 895mm

DSC02081.jpg
My First Coro Trainer Build
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BalaKrishnan
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« Reply #1 on: September 11, 2010, 07:00:46 PM »
xxkrishxx
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some more pics..

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Re: My First Coro Trainer Build
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BalaKrishnan
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« Reply #2 on: September 11, 2010, 07:06:23 PM »
rohitgupta322
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Where did u get the plans? Is this the SPADET trainer.
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« Reply #3 on: September 11, 2010, 07:12:10 PM »
xxkrishxx
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No,this is the AVISPAD trainer..
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BalaKrishnan
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« Reply #4 on: September 11, 2010, 07:56:50 PM »
xxkrishxx
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more..

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Re: My First Coro Trainer Build
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« Last Edit: September 11, 2010, 08:15:47 PM by xxkrishxx » Logged

BalaKrishnan
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« Reply #5 on: September 11, 2010, 08:53:08 PM »
xxkrishxx
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Final fuse..

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Re: My First Coro Trainer Build
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BalaKrishnan
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« Reply #6 on: September 11, 2010, 11:57:28 PM »
flying doc
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Are u putting an electric setup or do u plan a glow engine on this plane. If u are planning a glow engine then I feel a 3 mm coro fuse would be too light and would have a lot of torsion.
Waiting to see the rest of the build.
Best wishes for the build.
Doc
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« Reply #7 on: September 12, 2010, 07:20:46 AM »
xxkrishxx
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Thanks Doc..I'm planning to put electric set up..
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BalaKrishnan
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« Reply #8 on: September 12, 2010, 09:39:39 AM »
dileepbalan
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krish,

which build plan you are following? please do share it

Regards
Dileep
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« Reply #9 on: September 12, 2010, 07:49:06 PM »
xxkrishxx
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Will post the plans..I'm still confused about the wing spar..Don't have 4mm coro to use a coro spar..I found some 2.5mm light weight wooden material used in plywood door installation..Planning to use tat..Any suggestions?
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BalaKrishnan
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« Reply #10 on: September 12, 2010, 08:42:40 PM »
praveen
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try to find beech wood,used as beeding for door,window etc,available in different sizes in any wooden shop & ask for plain one!
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« Reply #11 on: September 12, 2010, 09:50:54 PM »
xxkrishxx
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Thanks praveen..I'll try tat..
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BalaKrishnan
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« Reply #12 on: September 13, 2010, 04:53:23 PM »
martian2121
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Edwin



Quote
krish,

which build plan you are following? please do share it

Regards
Dileep

The original Avispad Link => http://www.rcgroups.com/forums/showthread.php?t=893170
Guess this is the one Krish is following too. Its a very cool trainer if done light.
Hope this helps.
Edwin
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« Reply #13 on: September 14, 2010, 09:53:44 AM »
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Will post the plans..I'm still confused about the wing spar..Don't have 4mm coro to use a coro spar..I found some 2.5mm light weight wooden material used in plywood door installation..Planning to use tat..Any suggestions?
You can make a spar by folding a strip of 3mm coro like a triangular tube. I have used this design in a SPAD and it works well.

spar.jpg
Re: My First Coro Trainer Build
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« Reply #14 on: September 14, 2010, 01:09:04 PM »
xxkrishxx
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Hi sunlikestar this is entirely a new spar method,guess it'll be cool one..Can u tell me the flute direction in tat spar?
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BalaKrishnan
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« Reply #15 on: September 14, 2010, 02:45:51 PM »
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Hi sunlikestar this is entirely a new spar method,guess it'll be cool one..Can u tell me the flute direction in tat spar?
flutes run along the tubes length. I discovered this when i was fixing my SPAD, the complete plane was unharmed but the spar was broken in places. I just drew it out and inserted a triangular tube like this, however atleast 40% of the center portion was reinforced with plywood sitting vertically in the tube. but this was for a .40 size glow plane. for a light electric, it should work without the plywood.
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« Reply #16 on: September 14, 2010, 03:26:35 PM »
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Hello Sun,

The design you suggested may be fine for small electrics but do not attempt it for larger electric / glow models. I am sure the spar would not be sufficient on these larger models. You would be surprised at the forces acting on the wing during flight.

-Ismail
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« Reply #17 on: September 14, 2010, 03:48:38 PM »
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Hi Ismail,

So good to see you again. I hope you remember the SPAD you helped me build. That plane is still holding up and it now has a similar spar but as i said before, its reinforced by plywood sitting at the center. i have attached a picture.
Also it should be noted that forces acting on the wings of my plane is much lower than force acting on yours  Smiley

spar.jpg
Re: My First Coro Trainer Build
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« Reply #18 on: September 14, 2010, 04:10:21 PM »
izmile
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Aaah.. I remember you!... Hope you are doing well.

Coming back to the spar thing. As long as you have a rigid spar at the center you should be fine. You have shown a plywood at the center and that would take all the crushing forces.

I guess the triangular tube extend cannot more than 5 inches without the spar (using 3mm coro). More than that, it may hold up but its clearly asking for trouble. You don't want to have the wing fold up on a windy day.

-Ismail
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« Reply #19 on: September 14, 2010, 06:18:43 PM »
xxkrishxx
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Ismail will it be suitable for my wing span?
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BalaKrishnan
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« Reply #20 on: September 14, 2010, 06:20:35 PM »
xxkrishxx
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Sun how can we calculate the base n height dimensions of the spar to out wing span? Which thick plywood u used inside?
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BalaKrishnan
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« Reply #21 on: September 14, 2010, 07:08:20 PM »
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Your model has about 4 feet wing span. It is fine to follow the method suggested by Sun but I do not see a reason if you use the plywood spar already.

If I were you, I would use a light plywood spar for the entire length of the wing span.

-Ismail
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« Reply #22 on: September 14, 2010, 08:00:36 PM »
xxkrishxx
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The Plan..

Avispad Wingasembled.jpg
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BalaKrishnan
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« Reply #23 on: September 15, 2010, 01:06:41 PM »
xxkrishxx
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How can i make the triangular spar like in tat wing assembled pic? One half of the spar is horizontal n another half is 100mm up from the horizontal line..
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BalaKrishnan
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« Reply #24 on: September 16, 2010, 10:15:40 AM »
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How can i make the triangular spar like in tat wing assembled pic? One half of the spar is horizontal n another half is 100mm up from the horizontal line..
I double what Ismail said, also it doesn't look like the triangle tube will hold a dihedral. Better go for plywood.
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