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« on: October 10, 2015, 09:55:34 PM »
K K Iyer
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Now that the sweepstakes fever is over, thought i'd complete a project started for last year's sweepstakes:

The story started here last year:
 http://www.rcindia.org/electric-planes/5th-sweepstakes-sunbird-adiboy/msg178569/#msg178569

The tail feathers were easy, fuselage not too hard.
But the wing?
All i can say is that if you went by the so called instructions, you would NOT end up with wings!

Here are some pics:

image.jpg
Sunbird
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« Reply #1 on: October 10, 2015, 11:10:02 PM »
K K Iyer
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The wing area is a little over 2.5sqft.
Would you believe the weight after. 2 coats of Wonderwood on the fuselage?
Wing loading is going to be under 6oz/sqft
As compared to nearly 16oz/sqft for my similar size Pilatus B4
Hope to fly both tomorrow to compare...

image.jpg
Re: Sunbird
* image.jpg (80.23 KB, 800x600 - viewed 948 times.)
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« Reply #2 on: October 10, 2015, 11:29:09 PM »
RCNeil21
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Superb build sir looks like the bird of time glider, hope she sails as magnificently as her too. Thumbs Up
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Build planes like feathers rather than tanks, both handle bullets equally well.
 

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« Reply #3 on: October 11, 2015, 12:38:11 AM »
K K Iyer
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Which one should i fly tomorrow? Head Scratching
They are about the same size, but one is 360gms, the other >960gms...

image.jpg
Re: Sunbird
* image.jpg (82.47 KB, 800x600 - viewed 777 times.)
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« Reply #4 on: October 11, 2015, 01:25:04 AM »
AshwinRwt
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Stay calm, and soar



That is so beautiful!
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« Reply #5 on: October 11, 2015, 07:56:35 AM »
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 Clap Clap Clap
waiting for flight video Iyer Sir.

-learner
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« Reply #6 on: October 15, 2015, 12:55:07 AM »
nilharsh
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But how come so much difference in weight iyer sir...
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« Reply #7 on: October 15, 2015, 12:22:25 PM »
sanjayrai55
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Pretty birds sir  Salute

All the best for the maidens
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« Reply #8 on: October 15, 2015, 12:25:16 PM »
sundaram
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Beautiful Bird Sir  Clap Clap

Great Job  Thumbs Up Thumbs Up
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« Reply #9 on: October 15, 2015, 11:28:07 PM »
K K Iyer
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Thanks Tarneil, Ashwin, learner, Nirmal, Rai saheb and Col.

Must shamefacedly admit to the following mistakes:
1. In my hurry, forgot that the fin/rudder had just been pressed into place, but had not been glued
2. As usual for my maidens, it was tail heavy
3. As usual for my maidens, it was underpowered, due to habit of not using full throttle..
 Bang Head Bang Head Bang Head

Result - after hand launch, she climbed with great difficulty, right into the power lines.

Lesson: Cheap ply dihedral brace is useless. Replaced with hardwood (window baton)

Perhaps not having your regular buddy adds to mistakes. With my dad on 24hours oxygen now, either I or RC Aunt have to be at home if the other is away. So golf nearly shut down, not enough motivation to go so far alone. RC down to about once a month or so.
But
Only 3 more days till Sunday. Hope maid agrees to stay for 2 hours...

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« Reply #10 on: October 16, 2015, 10:46:59 AM »
Nithinraj Kotian
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woww.. superb build Iyer sir  Clap Clap Clap  Hats Off
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« Reply #11 on: October 16, 2015, 05:21:09 PM »
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Iyyer Sir, if you are in a hurry to maiden that beautiful bird early, we can meet up.Will have company.
Im planning to fly this Saturday too...early morning(Sunday flying as usual). Let me know if that suits you...would be treat watching it fly!!
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« Reply #12 on: December 11, 2015, 09:02:13 PM »
K K Iyer
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Here's a short video, of a home landing.


Inspired by posts of dhruvafreak and bmblb...

A home landing is some thing cherished by glider pilots, as it is the last flight of the day, and you can roll right up to the hangar after landing...

(Any IITK guys listening?)
Those who soloed on VT-GDD (Schweizer 2-22) and then progressed to VT-GDE (Schweizer 1-26) under Capt V V Nanda, Sanjay Atrishi, Rakesh Rastogi or Umesh Chandra in the late 70s- early 80s...
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« Reply #13 on: December 12, 2015, 12:10:14 AM »
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 .....so graceful......and what an enviable place to fly  Grin
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« Reply #14 on: December 12, 2015, 09:57:10 AM »
sanjayrai55
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Very nice, sir  Clap Clap

Now I must build a power glider. Corro, 60" + + span  >Cheesy
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« Reply #15 on: January 02, 2016, 07:29:07 PM »
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Nice build sir
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« Reply #16 on: January 03, 2016, 12:25:35 AM »
K K Iyer
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@bhanu Prakash,
Hum to aapka pinewood Cessna build dekh rahe the.
Aapko ye thread Kaise mila?
Regards.
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« Reply #17 on: January 03, 2016, 12:34:56 AM »
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Excellent build iyer sir Salute Salute Salute
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« Reply #18 on: March 25, 2016, 07:32:08 PM »
K K Iyer
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Forgot to upload video of flights after trimming completion.
Strong left roll corrected partially by removing (nearly imperceptible) warp in left wing, and by adding a small trim tab (1"x2"x1/4" depron). (No ailerons, only rudder, elevator, throttle)
Had looping tendency at over half throttle despite 2 washers downthrust.
Moved cg back gradually to remove up trim in elevator.
Was not enough.
Finally solved by mixing 5% down elevator into throttle!
(Had 10% initially, but that pulled the model down on launch...)

See if you can spot where i cut throttle (at about 22 seconds).
How high? 200-250 ft?
Thereafter in lift!


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« Reply #19 on: March 25, 2016, 08:14:15 PM »
K K Iyer
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Here is a pic of the wing joiner/ dihedral brace to make the wing two piece to fit in a small car.

image.jpg
Sunbird wing joiner
* image.jpg (48.28 KB, 800x600 - viewed 521 times.)
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« Reply #20 on: March 25, 2016, 08:41:59 PM »
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Sir, how do you ensure that the joiners don't slip out during fight? Is there some sort of locking mechanism inside?
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« Reply #21 on: March 25, 2016, 08:56:09 PM »
K K Iyer
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@intorc,
There's no force pulling the wing halves apart in normal flight.
So the rubber bands that hold the wing to the fuselage are enough to hold both halves together.

image.jpg
Re: Sunbird
* image.jpg (70.52 KB, 800x600 - viewed 534 times.)
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« Reply #22 on: March 25, 2016, 09:36:42 PM »
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May be a silly question but does it also apply in swept wings too?
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« Reply #23 on: March 25, 2016, 10:38:11 PM »
Tanmay.mathur
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Glide it up



 air to wings friction pulls wings back if you use the common spar perpendicular to cetre line
then there might be no problem.
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Regards,
Tanmay mathur
 

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« Reply #24 on: March 25, 2016, 10:46:41 PM »
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Iyer Sir....you have just the right place to SLOPE !!! overlooking your flying field !

need I say more ! Grin
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