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

some more pics..

Where did u get the plans? Is this the SPADET trainer.

No,this is the AVISPAD trainer..

more..

Final fuse..

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

Thanks Doc..I'm planning to put electric set up..

krish,

which build plan you are following? please do share it

Regards
Dileep

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?

try to find beech wood,used as beeding for door,window etc,available in different sizes in any wooden shop & ask for plain one!

Thanks praveen..I'll try tat..

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

Quote from: xxkrishxx on September 12, 2010, 07:49:06 PM
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.

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?

Quote from: xxkrishxx on September 14, 2010, 01:09:04 PM
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.

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

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 

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

Ismail will it be suitable for my wing span?

Sun how can we calculate the base n height dimensions of the spar to out wing span? Which thick plywood u used inside?

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

The Plan..

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..

Quote from: xxkrishxx on September 15, 2010, 01:06:41 PM
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.