RC India

after buiiding 300 coro ,help me in building in a plane so that i will not faced these problems

1.       no more broken props , so i am planning that the motor should be on back side like  
                      axn   floater.anybody have any plans for that  plz hepl.

2.       should survive litle bit crashes and the material i have is some sheets of coro and
           refridgerator thermocol
3. electronics weight is around less than 300 gram .


plz help tired of looking so much planes on different websites.

Vineet Try this you can build this easily from 3 mm Coro.

In place of a square fuselage which was made with depron like foam. you can bend the three mm coro from bottom and seal the fuselage from top and the lower fuselage will be rounded and top square one.

You can even cut the motor mount little higher to save props.

http://www.rcindia.org/electric-planes/easy-glider-with-5mm-depron-type-foam/

give me specs of your electronics along with its weights. I will be able to give you the plan modified for 3 mm coro.   

vineet... check this you have some plans here for a pusher.!

http://www.scratchrc.com/Scratch-Built-RC-Aircraft.html

http://www.scratchrc.com/Scratch-Build-Pusher-Planes.html

sent pm  of electronics to sunder sundar sir , dont mind if i call you that now.

will be posting some pics of electronics soon.

the pusher plans are good but cannot able to download them , what to do??

cant u try shikra from rcforall?

i know vineet is interested in pusher models but i need to ask something.
cant prop savers help him?
Also
its not necessary your prop will break, it can also chip off from the sides, so i think the prop can chip from the rear also?

You really want to stop your props from breaking i suggest you make do "tests" before you actually fly.

thanks for rply.

i am using motor from the reverse end i dont think a prop saver can be placed over there

test ???

how??

check out reply#39 on http://www.rcindia.org/electric-planes/my-first-scratchbuilt-plane/25/

A small tip... you can always post a direct link to any post. Like this one for Reply #39 mentioned in the above post.

http://www.rcindia.org/electric-planes/my-first-scratchbuilt-plane/msg68436/#msg68436

The link can be obtained from the clickable topic name ON THAT SPECIFIC POST.

And further on the topic of test, see the search results for "glide test" here.

http://www.rcindia.org/search2?search=glide+test

Doing glide tests can really help you save your day (and effort, patience, money, sanity, etc etc).

Please check the prop postion only.

http://www.youtube.com/watch?v=NfTdbbTE77A

and
http://www.rcindia.org/electric-planes/rcpowers-extra-300-using-3mm-coro/

And I have drawn the pic.
http://www.rcindia.org/for-sale/sale-sale-sale/msg68150/#msg68150

This can be easy for any starters and the prop may be saved as ot's periphery will be covered with coro materials.

@anwar
Thank you sir, i didnt know that.
next time ill keep that in mind.

Im sure someone else might have also devised the glide test, i always get lost doing forum searches.

ok got the test thing .

http://www.scratchrc.com/Scratch-Build-Pusher-Planes.html,

single boom

can i use this idea with 9*5 prop , like can we put motor mount little up for that

That does look do-able.

Since you said you are using 3 mm Coro, I think this design is possible if you have a glue gun. All cut outs can be joined together using thin hot glue bracing and where you are sticking two coro surfaces together, then sanded with emery and CA/ Araldite should do.

RC Friends who have worked with coro please suggest modification / improvements please.

http://www.youtube.com/watch?v=A_lf0WK4-Kk

Hello,

thanks for the encouragement , want some suggestion over this .

want to clear some points

a .  are the ailerons and rudder  are working right
b.   battery position is yet to be placed wondering where ?  
c.   and anything i do not know

d    ailerons effect is very less
e.  using BROKEN prop , its working fine , just a little bit vibration i thing , will it harm

          

Hi Vineet! Nice build!
Have you done a glide test? That will help you decide the position of the battery.
And why are the ESC terminals (XT60) not shrink-wrapped?

ya i have done it , it is not falling on its nose but it is going side ways as like drifting manner.

Have you tried flying it? :)

I guess the sideways-drifting could be controlled in flight. If not, try balancing the components.

could it be drifting because of a skew wing?

i dont know what is skew wing ?

but i noticed one thing that when it fly it goes to right and down also ,as if i am using rudder but the rudder is fixed as i am using alerons ,

and i cant hold wings on fuselarge because tape is not working and rubberband i cant use as there is no space .

by skew i mean the wings are not perpendicular to the fuselage.
To check on drifting you can also do glide tests and permanently modify the rudder.

To fix the wing.You can use zip ties like the photos.

If you are interested in a 3 channel trainer you can try this
http://www.rcindia.org/self-designed-diy-and-college-projects/scratch-build-ezfly-3ch-trainer/new/
it is a pusher prop with propeller housed inside the fuse so no chances of breaking the prop.

i also have plans for axn floater like plane, it is a big file and cannot be attached here send me your email and i will
send it, I have it in google sketchup and autocad format.

Subir

thanks nahu and swapnil,

i have traced some thing more first tje plane was not willing to go in air then i elevated the wings litle bit by putting some coro pices between fuse and wings below  edge of the wings, then it started flying , after that
 
now when i hand throw it it goes round and round  little bit to the right side as if we are using rudder , it is not rapidly going but like making circle of 10 meters i can say.

then i put a stone to the left side wing and throw it again it increases its diameter but didnot get the time for fully checking as the battery goes down , will try it again today


want to tell that my rudder is fixed and if i take a microscopic look at it , it is little bit tilted to the side opposite to where its going , will fix it also ,.


really feeling frustrated man sorry to say.   

subir sir very thanks for help ,


sent you a  pm.

Vineet, if the plane is flying why feeling frustrated?

Why don't you try adding a movable rudder.

ya ya it is flying , just like we fly paper plane with no controls for few meters ,
 on every day neighbour kids comes around me and ask " bhaiya ud gaya , kitna uper " and i say no babu .

but whenever i write a post it is in a bad mood, other wise i know it will fly good may be after some time 

i dont know it is a rudder effect exactly as it could be because of wrong position of wings on fuselarge , as i am using tape to keep the wings on fuse and every time it crash it moves slightly and i put tape again , has to check it all ,


will report on this evening what happened , now i am really concerning about the battery as after hitting several times the front fuse is destroyed and now the battery is open to hit on ground as it falls , so has to secure it before all

well any update?

hey pankaj sir thankyou for your valuable time i got from you , actually i have tried and found that the cg is abdrupt , like whien i hold the plane from its cg , the tail is too too heavy as compared to nose but i dont know how the hell it fly for the first time since there was no direction at all before making it , i think i should do some adjust ment , i am working on it and hopefully will do an update on sunday evening ,


anyways goodluck for you tommarow flying i hope i will join you some day with my own plane

That's some positive stuff bro! Keep working till you get there.
I'll be eagerly waiting for your maiden video. All the best!

  thanks bro,

Vineet, one thing I noticed from the pictures of your plane was that the control horns are not close to the hinge. This will reduce the movement of the control surface


Pankaj

thanks pankaj sir


ok thas why i was not getting the full control over the elerons

thanks for suggestions , i am modifying the plane plz suggest how would i do the controlsmore efficient .

Hmm... thats a tough question. If your wing is UC then you will have difficulty with ailerons. Thats what I am finding out as well.

To answer your question, I am sure you would remember the plane "lever" tool in physics. It had a load, fulcrum and effort. If yes, then think of the CG location as the fulcrum. So in order for controls to be effective for turning, they have to be away from the fulcrum (more the distance, the less the effort - remember?) It is why the ailerons are towards the wing tips in normal planes.
For starters, you could do what I have done, use rudder and elevator with the rudder plugged into the aileron channel. Once you learn to fly a bit, then modify the wing for aileron.
I am told that learning to fly with aileron is difficult. The reason cited is that is similar to learning how to cycle. When we first learn to ride a bicycle, we usually control the turn by turning the handle and as we progress we tend to bank on one side to turn. It is the same with RC flying. practice flying by turning the plane first using rudder and then by banking by using ailerons.

I am also learning so can't offer much advice

What i feel
The closer you keep the Servo,motor and the battery the better it will fly. The reason is that
There are three heavy components, 1.Motor 2.Battery 3.Servo.
Motor's is fixed. Battery is near the 1/3rd line, so its fixed too. So now you are left with the servos and the plane is balance. Now if the servos are of 10gm and is 1cm from 1/3rd line the torque induced is 10gm.cm and if its 10gm and placed 10cm away it'll cause a torque of 100gm.cm which will cause too much instability, so i recommend the servos be kept close to the 1/3line.

You can try increasing the size of the ailerons, to make it roll harder.
Since i am also a beginner, i prefer ailerons to rudders on a scratch-built because a scratch built has a greater tendency to be unstable. Since vineet's plane doesnot have dihedrals he 'will' require roll stability. Even if he does put dihedrals i do not know if they will keep the plane level, in my experience they dont. In the coming future i will work on dihedrals and maybe then i will start liking them.
So i suggest you keep the ailerons and increase their size and see how they work.
Ailerons will give you more degrees of freedom, which gives you more things to worry about but you will have a lesser chance of losing the plane to a helpless crash.

naatumach :

i have made a new wing which has big ailerons and half of the weight , the fuse is same ,

the plane was not getting enough thrust as it was going like down after a few distance , thn changed the prop , now 10*4.7 e  prop more thrust less sound , now the motor is giving enough thrust at half  throttle ,

now 2 problems left one is that  it is  tail heavy as it is going straight but at an angle of 70 dergree , tail is down and front is up .there is no way of placing the battery more nar to nose at no space left .

Vineet, if could you post pictures it would be easier for our seniors to help you.
(i.e pics of current locatoin of battery, servos, wing etc)

i was going to say the same thing. Please post three photos Front, Top and side, like a blueprint.

If tail is down and front is up, that means you are getting more lift in the Front than the rear. refer to the photo attached. So i suggest that you try to coincide the Orange and the Green arrows.
This can be done by-
1.Adjusting the wing
2.Adjusting the rear servo's position
3.Adjusting the battery's position

ok bros , i will post some pics at night , right now going for maiden , lets see what happens , how it reacts.

best of luck

Not necessarily. One of the stable learning platform's, the easy-star has it's battery in the nose section, the ESC and receiver between the battery and COG, the servo's are almost aligned to the vertical axis of COG, and the motor is behind the center of gravity. No matter where are the part's placed, they must be adjusted such that the plane's COG should be around 33% of the wing's LE.

@ashutoshn : i agree with you but if there is problem, this can be a possible solution.

ashu and naat ,

thanks to you both , for the first time i managed to keep it up in the air may be for 20 sec but i can say that    the cog is right as no nose falling no tail heavy , but some drag problem as i have not made the nose aerodynamic ,will describe it more as post some pics .
the problem is the battery is getting down quickly ,thats why post a new thread will again fly it tommarow and will tell you a story .

which material you are using

ha ha how did you find this post its been 6 years ,fyi read and then ask ,like we do its clear what have i used

I made