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« on: July 12, 2014, 06:26:42 PM »
topalle
Topalle Srinivas Azad
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Hello guys, I had started construction of a skysurfer inspired plane from coro... Please have a look and give me any sugessions...
 Hats Off

P.S
Its wing is still short as I am yet to add tip dihedral
its 3 feet wingspan and 3 feet fuse length...
I'll make the wingspan 4 feet after adding tip dihedral

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Sky surfer inspired plane...
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« Reply #1 on: July 12, 2014, 06:28:39 PM »
topalle
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 I have used a aerofoil type vertical tailplane...
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« Reply #2 on: July 12, 2014, 06:54:02 PM »
manojswizera
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Azad, don't make the tail fuse too long, it will be very difficult to balance the plane at CG position.
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« Reply #3 on: July 12, 2014, 06:56:35 PM »
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shall i chop off some length of the fuse? or shall I devise a method af mounting the wing further behind?
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« Reply #4 on: July 12, 2014, 06:59:28 PM »
manojswizera
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better chop off some.
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« Reply #5 on: July 12, 2014, 07:04:16 PM »
topalle
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ok let me do that...
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« Reply #6 on: July 12, 2014, 08:07:04 PM »
topalle
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chopped off ~ 4 inches from the rear...
Now I guess this is a smaller plane so 3 foot wingspan will do for it...
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« Reply #7 on: July 12, 2014, 09:08:07 PM »
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Looking good Smiley
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« Reply #8 on: July 12, 2014, 09:27:13 PM »
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It was necessary to reduce the size of the fuselage. Usually, it should be 70-80% of wingspan(though not always necessary)
Secondly, I would like to point out towards the sharp edges. Since, this is coro and now fuse is almost done so it would be difficult but, try to make the edges smooth. Sharp edges create unnecessary drag. This must have been done while cutting the fuselage out of coro sheet. But, still you can give it a try.

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« Reply #9 on: July 12, 2014, 09:30:22 PM »
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Have you designed this yourself or used some reference source. Mention about the chord length. Also, what power setup you are planning to use for this.
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« Reply #10 on: July 13, 2014, 01:20:52 PM »
topalle
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I plan to use 1000 kv or more motor with 25 amp esc...
also I'll use 2200 mah lipo.
I can make the edges a bit more smooth but too much is not possible
 chord is 7 inches
« Last Edit: July 13, 2014, 03:58:36 PM by topalle » Logged

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« Reply #11 on: July 13, 2014, 03:56:53 PM »
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any new ideas for control surfaces that can be made out of 2mm coro?
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« Reply #12 on: July 13, 2014, 05:04:44 PM »
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Great work Azad
2mm coro itself is weak for ailerons, bulges.. you might want to strengthen them using wire (wire used for pulling electrical wires through conduits is very strong)...A single insert close to the hinge should do the job, or just double the coro for ~4mm

All the best
GS
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« Reply #13 on: July 13, 2014, 05:36:37 PM »
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Re:

Good work Azad...
By the way what's the prop you plan to use?
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« Reply #14 on: July 13, 2014, 09:16:34 PM »
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Thank you sirs,
Some drastic, unexpected changes over here.... Shocked

The fuse became very heavy... Bang Head I was also suspecting some tail heaviness... motor mount would be very brittle on the previous fuse..
My solution...Discarded the old fuse... wing was retained as it came out very well

I guess it will be better to join the empennage via a strong, lightweight boom to the fuselage.

Wing tips are made so as to increase the wingspan to 4 feet but aren't yet joined to the wing...

Ailerons are made using 2mm coro doubled to make 4 mm coro...probably i will put in some bamboo skewers in the ailerons to reduce fluttering

Current weight of the wing and wingtips together is shown below
The peice of coro lying there is the template for the fuse...

I plan to use 8 inch prop...

What to use for the boom?


DSCN5808.jpg
Re: Pusher Trainer plane...
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« Reply #15 on: July 13, 2014, 10:56:33 PM »
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you could try round aluminium pipe for the boom, its pretty light and easily available at hardware stores.
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« Reply #16 on: July 13, 2014, 11:03:40 PM »
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Srinivas
Try a carbon tube boom like on my RCTLG.
From nose to tail.
Prevents fuselage from breaking in a crash!

image.jpg
Re: Sky surfer inspired plane...
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« Reply #17 on: July 14, 2014, 08:57:38 AM »
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topalle


this is going to be a very safer airplane for the equipment , as motor is in pusher configuration make both motor and prop in safe condition


best of luck for the design




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« Reply #18 on: July 14, 2014, 12:26:18 PM »
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Re:

Azad are you sure you will get enough thrust with that combo...  As per thrust calculator that combo should yield around 700 gms of thrust...  Do give a thought on increasing the kv of the motor ...
All the best
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« Reply #19 on: July 14, 2014, 08:33:11 PM »
topalle
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AUW has not been calculated yet... only after that i'll finalise motor

Aluminium pipe is a good SPAD idea..
CF is stronger than aluminium pipe though..
Construction will restart next saturday evening...
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« Reply #20 on: July 19, 2014, 08:11:49 PM »
topalle
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I wan to achieve something like this...
Pics taken from here
http://www.rcgroups.com/forums/showthread.php?t=2194226

Push tee motor.jpg
Re: Sky surfer inspired plane...
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« Reply #21 on: July 19, 2014, 08:12:29 PM »
topalle
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Where do we get this aluminum channel?
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« Reply #22 on: July 19, 2014, 08:18:38 PM »
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u can get it in hardware store
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« Reply #23 on: July 19, 2014, 08:25:38 PM »
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i have already made this type of plane but in tractor configuration.flies well

10490187_1428042417483181_1120917009_n.jpg
Re: Sky surfer inspired plane...
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« Reply #24 on: July 19, 2014, 08:27:51 PM »
topalle
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some more pics of the boom attachment please....
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