Here's my first scratch-built bird.

It's a single-aileron coro.
It turned out to be much heavier than was planned; couldn't take-off. Gonna reduce the weight and try again.

The hinges were made using gell-refills and metal strings. I tried using plastic and tape hinges on prototype wings, but wasn't too happy with their working.   

I would greatly appreciate suggestions for rectifying/modifying dimensions & weight.

Dimensions :::

Chord: 9
Span : 36
Aileron : 17X2.25
Elevator: 11x2.5
CG: 2.7 behind leading-edge

Power setup:::

BLDC: A2836-8
ESC : 30A
prop: 10x5E
LiPo: 3S, 1000mAH, 22C
3 x Power HD Servos (HD-1900A)

Building materials:::

Wings: 4mm coroplast (+ kebab sticks)
Fuselage stick: wood (1486mm x 30mm X 6mm)
Motor-mount: aluminium (2mm)
hinges : empty gell refills + steel threads

Pics...

nice build swapnil,do you maiden it yet?

Sorry, no maiden yet.
I'm reducing its weight right now. It gathers enough speed after a 4 metre run but doesn't take-off. If weight reduction doesn't work, I'm gonna try converting the flat-wing to a flat-bottom airfoil.

i had tried the same type of plane which is my first plane,had same experience but it never take off,stopped it right there and tried other plane,then the blu baby(i had some problems with foam wing),then now trying moss,all i want to say is never ever give up,keep trying and keep the spirit,make sure the c.g is correct and when you test glide it,it should glide smoothly which mean that your plane is ready to fly,all the best  

Harsha, I'm not gonna give up on it and start with another plane. Thanks for your suggestions. I'll surely test-glide it first when I'm done modifying it.

Here are the vids of aileron and elevator throws. Is the mechanism for aileron movement effective? I've not seen something like this in any of the 'scratchbuilt' threads I've been through so far. Waiting for comments from seniors on this.

What is the all up weight? Also could not see the horizontal fin. just photo missing or what?

Yep, where is the vertical fin/stabilizer ?  That would be a key factor for the stability of a model with this type of design.

@Pankaj: AUW is more than what was desired. Reducing it right now...

Quote from: anwar on June 16, 2011, 05:40:16 PM
Yep, where is the vertical fin/stabilizer ?  That would be a key factor for the stability of a model with this type of design.

The vertical stab will be added soon, the bird's still in its construction phase. I'm currently working on reducing the AUW. (Wonder if I should put it on a diet )

Anwar sir, I'm using a single aileron as it is easier with the type of hinge I'm using (Also, www.foamflyer.info has loads of planes with single ailerons). Should I have gone with the regular twin ailerons?   
 

IMHO, with the span and chord being 36 x 9, anything above 600gms all up would not be suitable for a newbie as it would result in a high wing loading and thereby increasing the stall speed

Whats that going through the tail wing does`nt look like servo, is it an LED ??

Are you referring to the tail-wing in the video or in the pic?
Either way, it's not an LED, I haven't used one. I think you saw a bolt tip... 

Preferably, remove all landing gear, its just useless weight when the plane is in the air. Also, the fuse can be thinner (is it plywood?) Could try out thin frame sticks from a picture framing shop. Remove all bolts and simply use rubber bands with double sided tape or plastic ties or to hold the servos.

The wings seem to be drooping in one of pics, will be good to include some dihedral.

Quote from: tg on June 17, 2011, 10:18:05 AM
Preferably, remove all landing gear, its just useless weight when the plane is in the air. Also, the fuse can be thinner (is it plywood?) Could try out thin frame sticks from a picture framing shop. Remove all bolts and simply use rubber bands with double sided tape or plastic ties or to hold the servos.

Hmm.. can't do without a landing gear. Even though it's useless in air, I'd rather damage a couple of wheels than a prop or wing. Gonna remove as many nut-bolts as possible and use tape, hot-glue, cable-ties etc. Thanks for the tips!  

Quote from: tg on June 17, 2011, 10:19:57 AM
The wings seem to be drooping in one of pics, will be good to include some dihedral.

The pics were taken with the reinforcements removed. The wing gets a curved dihedral (like that in an Easystar) with 0.5mm steel fibres in the flutes.

The plane was tail-heavy. Moved the main wing 1.5 in behind original leading edge. Also reduced the fuselage-tail area by half.

Built a new landing gear. It's a lot lighter than the previous one, though not as sturdy...

Quote from: tg on June 17, 2011, 10:19:57 AM
The wings seem to be drooping in one of pics, will be good to include some dihedral.

Swapnil, please check this out first.

Sir, I replied to that in #16...

hi,

Just sharing my experience with 4mm CORO, although being a new bee.

First i tried to make a UC wing but the wing got twisted due to leading edge folding
- First time wing folden
- second time , went to right without any of my control...broke everything.

Second , Tried to make a MOSS . it flew but it was very fast and every landing i would break the prop or motor mount

Last : Bought a GWS beaver... Nice docile .

So my advise for making coro plan on flat wing would be to go for Extra 300 ,  there was a very recent post on the same.

from where did u buy the beaver ?

Modified the tail-gear....
It's much lighter now. 

Changed the fuselage-stick. New one has half the area and weight.
Removed most of the nut-bolts.

Wonder if I should remove the tail-gear completely.