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Build log: Model 2

Started by naatumach, June 23, 2011, 10:34:20 AM

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naatumach

Hi
My last fuselage broke so i am making a new one, since i do have 10props i do not fear crashing a lot, so vineet you can follow this.
Here it goes.
I am not confirming it will fly but atleast you can see it go and if all goes well it will fly.
Motto: build, fly, and modify.
Prefers working on designs than electronics.
No pre-made plans. Use blueprints, make calculations, build, fly, troubleshoot, fly again.

naatumach

After going through a lot of options i have decided,
I will go for a design similar to the image posted
Motto: build, fly, and modify.
Prefers working on designs than electronics.
No pre-made plans. Use blueprints, make calculations, build, fly, troubleshoot, fly again.

Swapnil

Way to go!
Could you post the side-view of the wing? I wanted to see the airfoil shape...

naatumach

Sure. This wing's airfoil is not atall pretty or dimensionally correct, but it works, and i have scarce depron to make another one.
I will be reusing the Wing, rudder and motormount.
Attached are the pictures.
i do intend to but a motor mount, i will buy one when ill go to bangalore on 3rd july, i want to buy one of those aeolian motormounts they have on rcbazaar
Motto: build, fly, and modify.
Prefers working on designs than electronics.
No pre-made plans. Use blueprints, make calculations, build, fly, troubleshoot, fly again.

naatumach

Step 2: Draw and Cut Out
Take measurements
Draw on foam
Cut out
Also mark the places for the servos to come.
Step 4: Make hinges
Step 5:Glue everything together
Step 6:Place the electronics
Motto: build, fly, and modify.
Prefers working on designs than electronics.
No pre-made plans. Use blueprints, make calculations, build, fly, troubleshoot, fly again.

naatumach

I made these dimensions in powerpoint, i dont have any of my usual softwares at home.
The top and bottom rectangles are the sidepanels
The elevator is fused in the base. That ways i have one parallel surface to worry about. If i had the depron, i would have made the wings, bottom and elevator on the same piece.
Motto: build, fly, and modify.
Prefers working on designs than electronics.
No pre-made plans. Use blueprints, make calculations, build, fly, troubleshoot, fly again.

Swapnil

Vaibhav, I can't see the name of the Radio in the pic properly. Which Radio is it?

naatumach

Motto: build, fly, and modify.
Prefers working on designs than electronics.
No pre-made plans. Use blueprints, make calculations, build, fly, troubleshoot, fly again.

naatumach

Find CG of fuselage and place the wing  1/3 right over the cg
Motto: build, fly, and modify.
Prefers working on designs than electronics.
No pre-made plans. Use blueprints, make calculations, build, fly, troubleshoot, fly again.

naatumach

#9
All done set to fly. Did three sorties
Sortie 1 - Prototype 1: (the first a/c) flew well, then a gust came and knocked it out of the sky, and broke.
Then i made model 2
Sortie 2 - Threw at 30% throttle so it stalled and crashed.
Sortie 3 - During my preliminary checks i noticed that the motor was a skew by a few angles, and not to forget my dreaded motor starting problem. ( im not sure if it is visible in the videos)
Threw the plane and it rolled over and crashed even though i was giving full input to roll, but after scrutinizing the video im guessing the controls were inverted  :banghead: but im not really sure of that.

Propellor safe :)

Will rebuild the a/c but only after getting

Sortie 1:


Sortie 2:


Sortie 3:

Aeolian C2822-KV1200 brushless motor  and a new motor mount (cage type) from rcbazaar

But that will not be before 18july because im going to bangalore from 3july to 17july.

And also learnt a few things
When in doubt, do not fly.
When in excitement, do not fly.
When in wind, do not fly.


Motto: build, fly, and modify.
Prefers working on designs than electronics.
No pre-made plans. Use blueprints, make calculations, build, fly, troubleshoot, fly again.

naatumach

Just did damage assessment.
Will fix the a/c and will try again.
Cant give up with just one crash.
Will make it fly
Motto: build, fly, and modify.
Prefers working on designs than electronics.
No pre-made plans. Use blueprints, make calculations, build, fly, troubleshoot, fly again.

naatumach

#11
So the controls were actually inverted, im uploading the test video on youtube.
The problem was that the aircraft was rolling in the direction opposite to the stick.
Will test fly in the morning.  ;D

Motto: build, fly, and modify.
Prefers working on designs than electronics.
No pre-made plans. Use blueprints, make calculations, build, fly, troubleshoot, fly again.

naatumach

All tests done.. Good to go, will try again.
I should have really tested this part.
Motto: build, fly, and modify.
Prefers working on designs than electronics.
No pre-made plans. Use blueprints, make calculations, build, fly, troubleshoot, fly again.

naatumach

Seeing how the first sortie nosedived and the elevators couldnt pull the a/c out of the dive i decided to add a safety feature.
and voila "spoiler" connected to the gyro switch on the Rx.
Cant test the design right now, because its too windy outside. Will fly as soon as the wind calms down.
Motto: build, fly, and modify.
Prefers working on designs than electronics.
No pre-made plans. Use blueprints, make calculations, build, fly, troubleshoot, fly again.

naatumach

#14
It lives! haha it flies  ;D
So the problem was that I had inverted the controls and the a/c rolled into the turn and crashed.
Then after rectifying the error by interchanging the servos on channel 1 and 2, i checked it again.

Then in the morning i made spoilers.

Just now returned from the sortie, which was cut short because of discharged tx, now charging it again, will fly and test the spoiler in the evening.

But it flies, so here you go vineet. One complete build log, with tests and crashes and reconstructions, but no prop breaks, awesome sturdy props by rcdhamaka.

Sortie 4 Powered upto 60%, gentle launch. Took controls, did sort of an "s", relieved that it flies and also worried about the tx battery, i landed the a/c.

Motto: build, fly, and modify.
Prefers working on designs than electronics.
No pre-made plans. Use blueprints, make calculations, build, fly, troubleshoot, fly again.

naatumach

This is how im thinking of testing the spoiler.
During the ground tests i realized that the elevators were responding better than the spoiler but i am guessing its because elevators are in line with the prop where as the spoilers are not.
When flying the spoiler will also be subjected to moving air and not just the prop wash.

So to test the working of the spoiler, i intend to
1. Take the a/c to about a height of 20ft
2. Cut throttle
3. Pitch down by 20 degrees
4. Switch on the spoilers, the a/c should pitch up.
5. Switch off the spoiler, turn on motor and land

gradually increase the pitch down angle till 70 or 80 degrees and test.
*numerical values are subject to change*
Motto: build, fly, and modify.
Prefers working on designs than electronics.
No pre-made plans. Use blueprints, make calculations, build, fly, troubleshoot, fly again.

naatumach

Tests delayed till Monday on account of a bad wall adapter for charger for LiPo
Motto: build, fly, and modify.
Prefers working on designs than electronics.
No pre-made plans. Use blueprints, make calculations, build, fly, troubleshoot, fly again.

Swapnil

What happened to your adaptor? Mine blasted a few days ago. :banghead:

naatumach

My adapter's light starts flickering after two mins and then it dies.
and its really windy in chennai! how is the weather on your side?
Motto: build, fly, and modify.
Prefers working on designs than electronics.
No pre-made plans. Use blueprints, make calculations, build, fly, troubleshoot, fly again.

Swapnil

Weather's bad. Guess I'm gonna have to pause RC and play with robotics till the rainy season's over.

naatumach

i got no time for robotics, i wanted to learn PID coding (just for fun) but now im running out of time so i'll not get into it, except learning PID.
Motto: build, fly, and modify.
Prefers working on designs than electronics.
No pre-made plans. Use blueprints, make calculations, build, fly, troubleshoot, fly again.

Swapnil

PID is simple. There's even standard code for line-following, grid solving etc. I

naatumach

standard code for what avr, pic?
Motto: build, fly, and modify.
Prefers working on designs than electronics.
No pre-made plans. Use blueprints, make calculations, build, fly, troubleshoot, fly again.

Swapnil


naatumach

come on seriously! i tried so much to find codes for a line follower based on pid, i knocked my brains out! i had something called an avr library but really couldnt figure how it works...
Motto: build, fly, and modify.
Prefers working on designs than electronics.
No pre-made plans. Use blueprints, make calculations, build, fly, troubleshoot, fly again.