RC India

Since depron sheets almost finished, started experiments with Corro... ;D Let us see how it turns out....

Where did u find coro and how much did it cost you

Coro is available  most of the cities , since it's used for printing and sign board purposes ,  In Muvattupuzha it costs about 350 -400

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Miles to go, but finally it is something like this...

 :thumbsup: :thumbsup:

Thank you sir and you are my inspiration 👍🏻

Keep building and flying them! Only gets better

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Exactly that is what I am doing sir... Yesterday ordered motor, esc, servos etc...

Coming along well SI. All the best.

Thanks Girish, I think it should look good. Slightly modified it . Now the fuselage looks like this. Filled it with a thick piece of Thermocol , and it feels solid now.

Could not resist a trial run ;D , so half finished , took it to air. Wow, it flew, but the problem was bit of rocking sideways- is it due to slight warping of stab? ( bound to happen since I used 1mm Corro ) and the (slow) flights were not as smooth as with depron. [here we won't get 4mm Corro locally]
Specs. Wing: 920 mm* 25 mm
AUW:380 gms (on 500mah lipo)
Motor: A2212/13 KV1000
30amp esc
Prop:8*6 SF


So lessons learned;
1. Use thicker ( 3-4 mm) Corro to build stab.
2. Need more effort to build wing out of  Corro (than depron)
3. There is more weight for Corro than depron, so choose motor/esc accordingly.
4. Give more respect to Sanjai sir  :salute:  :hatsoff:  ;D

1mm coro is weak for stab, where did you get 1mm. You can double up stab and slot opposite sides for making  hinge.
Great going  :thumbsup:

Okay. Thanks for the suggestion. 'll do that.👍🏻

Thicken the vertical stab as Girish suggested. Also check the horizontal stab. With 1 mm corro even that will "flutter"  Could well need some reinforcing

Last, but not least, ensure you use an adequate number of rubber bands to hold down the wings!

Okay sir, noted, thank you. Let me do all these mods.

Thank you so much Sanjai sir& Girish. To make it more stable& straight,(and to make sure nothing else is wrong so that I can go ahead)  pasted small pieces of depron over each stab; used thicker &stronger rubber bands - wow, now it flies super stable and smooth. 👍 'll post flight vid tomorrow. Thanks once again.
   Now I have one more que: I used cycle spoke to make the landing gear; and used nut and bolt to tighten it to fuselage. But since the plane is lil heavy~400mg, after few landings , it loosens from the fuselage. How to tackle this?

Please see piper cub 6th scale in corro to get an excellent demo on landing gear.

Okay Thanks. I found this on you tube, simple and fast.. Let me try. https://m.youtube.com/watch?v=po2P1X2OsGA

Did something like that... Let me see how well it holds...

Good luck with that. BTW, have you glued a ply plate inside the fuse to support the LG? Otherwise the corro will tear

Sir,What I did was to screw the landing gear to an old (reliance store) card and then hot glue the whole unit to underside.., so that the impact of landing would be distributed to a wide area.But I know this won't last long, so I'll do what you suggested.Thanks.

https://youtu.be/IEL6kCBDepw


Quick video of its flight. As it is a big plane ;D and as seen in video, crash landing due to space constraints, I 'll build a smaller version today. ;)

Very nice  :thumbsup:  Hope no damage done

You must fly in a larger place

Yes sir, but due to lack of time :( and I want to fly it in my backyard itself, cut wing to 76cm wing span, (flew it just now) and now it suits my space :thumbsup: Happy.

@SI74,
Why did you cut the span? Is it not harder to fly now due to higher wing loading?
Was flying quite nicely at 920mm span, perhaps just a bit tail heavy.
Really liked the last few seconds in slow motion, especially as it showed how well she flew when not at a high angle of attack...
Well done. Congrats.  {:)}

Thank you Iyer sir. What you told is true sir, but still it flies pretty good, may be because I am more confident on its size and not that worried whether the wing might touch any tree /electric line🙄 . Yes, it's a bit tail heavy ,and I had plans of using 1000mah Lipo instead. It was a quick video,before it rains, so didn't care to replace the Lipo.

Now that I am confident with corro, started to build a smaller scaled  ;D version . This time , plan is to correct mistakes on previous build. Thanks Sanjay sir, Girish & Iyer sir for encouragement 👍 .

More pics...

And more...

And finally... All snaps just to show how I make them and it's simple!

And a wing with Thermocol ribs...

sweet! must must find a ground! with coro builds one must diligently follow the square-cube rule, the bigger the model, the better the wing loading and stability (of course to a certain size).
Great build, and nice slow flying characteristics. feels a little tail heavy though. All the best.

Thanks Girish for your advice; followed your& Iyer sir's advice and made another wing that suits this plane- now 92.5*23 cm. Easy take off, flies superb too :thumbsup: ( the 25*76 cm was aesthetically bad choice)

To finish,  ;D some crazy painting ....

If it didn't have a name before, you can name it now - Rangeela!  ;D

Exactly sir! You read my mind, actually yesterday when I posted this pic, I thought of adding this name! , but eventually forgot.🙂 Now I have plans to tie few colourful ribbons to the jutting out portion of CF road  :giggle:

Plan as requested by a member ( ONLY FOR BEGINNERS AND THOSE WITH LACK OF TIME FOR BUILD ) . May use 500-1000 mah 2S lipo, or 450 mah 3S instead.But move wing forward so as to adjust CG.
Few points to be noted while building:
 1. When you mount motor, make sure it points slightly down- may be 2degree.

2.one may use 1-2 mm Corro to build fuselage/wing ;BUT, use 3-4 mm Corro for stab. Make sure there is  NO warping of stab, especially the elev/rudder.

3.If you use 1-2 mm Corro to build fuselage, fill interior with usual thermocole so that it won't bent even on crash landing.

4.cut enough space for esc, so that there is enough heat dispersion.

5. Use CA to glue a ] shaped piece of Corro inside the front portion and then HotGlue motor mount to this, so that there is no vibration of motor.

6.Glue a small square piece of hard plastic to Corro at the sites where you pass wing mounts.

7 .Using zip tie, attach landing gear to a (credit/plastic ) card; bent it to tightly fit the outside of fuselage, then HotGlue it. ( idea is that even it tears off on landing, should not damage fuselage)

8.Cut a linear hole in horizontal stab to pass vertical stab, so that it doesn't flutter sideways.This method also helps to adjust the vertical stab after full construction before glueing / fixing permanently.

9. When you build wing, try to use a fresh piece of Corro (no bend /twist) , mark the bottom area, hotglue cf rod/ thermocole ribs , then mark/cut a bigger piece to make it into an aerofoil. This would make the wing (even 1mm corro) strong. Avoid glueing rib at the centre of wing , so that when you put rubber bands to hold it,  it will give a slight upward bend at the centre.

10. Finally use either paint/ acrylic colours to make the model attractive ;D

It is easy to cut this Corro using sharp scissors.

Forgot to add -use sufficiently tight rubber bands to hold wing, slightly bigger ground than a backyard! :)
When you insert wheels , use small pieces of heat shrink tube (on both sides of the wheel) to keep them straight.

Slight correction in the wing dimension. Error regretted.

Actually , I am into another build... Smaller version... 'll update on its progress... This time trying to follow Sanjai sir's (some) build techniques..

Still learning .... 1. As I was suggested to do (by Rai Saheb) , now know  ,how to attach LG to ply (placed inside fuse) 2. How to conceal servos inside . Both works fine. Maidened today..

And this's how it looks like.Looks good, flies well too..

Super progress! Very professional  {:)} {:)}

A million thanks sir! As one member was interested on this build, I am again attaching another simple wing with Corro - this reduces weight of the wing, very effective aerofoil , and is super easy to build.

Flight video.

https://youtu.be/goOMpzc0-dA

 {:)}
GREAT