Piper cub using coro sheet , thermocol, wood, bamboo sticks.

Started by wingmanbunty, June 29, 2017, 07:44:50 PM

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prabal276

The tips of the skysurfer wings are raised.
That's what makes it stable.
Someone recently posted that cutting the tips away makes it sporty.
For a scale appearance , you will have to make a tip~less wing.
So you should have an sporty wing.
Piper Cubs do have a tendency to tip stall and you need to get the thrust and thrust angle just right otherwise it is a mess. I had built one some time before. It was a mess

prabal276

Go for an normal flat bottom airfoil in the middle and make the tips under cambered. Just like Josh bixler does on his FT spitfire.
That should prevent tip stalls.

wingmanbunty

prabal thanks for the information ,  Josh bixler is great guy dedicated to rc i really like the ft simple cub i am trying to use the colour combination from that. Also i like their landing gear design.



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wingmanbunty

Actually i build coro fuselage along with wings so please don't mind these are old pictures.


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prabal276

nice going!
elevator is drooping in the last picture....
haven't glued yet?

wingmanbunty

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wingmanbunty

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wingmanbunty

construction of hinges using mango wood strip, empty pen rifill.


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wingmanbunty

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wingmanbunty

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wingmanbunty

installation of electronics and control links using high gauge wire , fan rewinding cover pipes .


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wingmanbunty

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wingmanbunty

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wingmanbunty

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prabal276


wingmanbunty

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prabal276


unidrakeshrc

I posted the modified version of Sky Surfer by cutting the tips away. Please note my intention was that if u are tired of flying the stable plane u can cut off the tip and u will find that it will be difficult to control it and it will give similar challenges for flying as in sports plane or more.

wingmanbunty

prabal
i think maiden will be next weekend.
unidrakeshrc
Please share the link I will be very happy to know about it . I really want to know how sky surfer behave after cutting the tips. Do you have video?
Also share your experience of tip stall. Piper cub is I think is most beautiful airplane. What I had done is it has plane bottom wing profile and i had adapted wing profile of sky surfer. I had given enough dihedral for wings. It will be interesting to predict how airplane is going to behave, please share your views.
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unidrakeshrc

Hi Wingman! Thanks for showing your interest.
http://www.rcindia.org/chatter-zone/convert-your-sky-surfer/msg273529/#msg273529
I have posted the pictures in the link. Yeah at the beginning I did face Tip Stall, but after slight adjustments in the aeliron servos I was able to solve the problem. Please also see the profile of the wings that I have maintained. I have not recorded any video, however I will post them soon.
I have seen your pictures of your wing. I personally think there may be a lift problem, however it will fly.

wingmanbunty

@unidrakeshrc
thanks for the info how is the glide of the aircraft after this modification
i design this profile because of the glide of the airplane , if there is lift problem in the wing i have to redesign it and apply plain wing at the bottom.
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wingmanbunty

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wingmanbunty

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wingmanbunty

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wingmanbunty

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