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Sunbird
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«
on:
October 10, 2015, 09:55:34 PM »
K K Iyer
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Sunbird
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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:
Sunbird
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«
Last Edit: October 10, 2015, 11:02:49 PM by K K Iyer
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Reply #1 on:
October 10, 2015, 11:10:02 PM »
K K Iyer
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Re: Sunbird
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...
Re: Sunbird
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«
Reply #2 on:
October 10, 2015, 11:29:09 PM »
RCNeil21
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Patient Zero
Re: Sunbird
Superb build sir looks like the bird of time glider, hope she sails as magnificently as her too.
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Build planes like feathers rather than tanks, both handle bullets equally well.
«
Reply #3 on:
October 11, 2015, 12:38:11 AM »
K K Iyer
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Re: Sunbird
Which one should i fly tomorrow?
They are about the same size, but one is 360gms, the other >960gms...
Re: Sunbird
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Reply #4 on:
October 11, 2015, 01:25:04 AM »
AshwinRwt
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Stay calm, and soar
Re: Sunbird
That is so beautiful!
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«
Reply #5 on:
October 11, 2015, 07:56:35 AM »
learner
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Re: Sunbird
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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Re: Sunbird
But how come so much difference in weight iyer sir...
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GOOD OLD NILHARSH
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Reply #7 on:
October 15, 2015, 12:22:25 PM »
sanjayrai55
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Re: Sunbird
Pretty birds sir
All the best for the maidens
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Sanjay - Gravity is my enemy
http://www.rcindia.org/rc-people/builds-i-have-posted-on-rci/
«
Reply #8 on:
October 15, 2015, 12:25:16 PM »
sundaram
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Re: Sunbird
Beautiful Bird Sir
Great Job
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Sandy's Hangar and Introduction
.
«
Reply #9 on:
October 15, 2015, 11:28:07 PM »
K K Iyer
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Re: Sunbird
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..
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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Re: Sunbird
woww.. superb build Iyer sir
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Life is Simple Don't Make it Complicated
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Reply #11 on:
October 16, 2015, 05:21:09 PM »
Devashish
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Re: Sunbird
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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Re: Sunbird
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...
«
Last Edit: December 11, 2015, 10:01:34 PM by K K Iyer
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Reply #13 on:
December 12, 2015, 12:10:14 AM »
bmblb
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Re: Sunbird
.....so graceful......and what an enviable place to fly
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"The Flight Of The Bumblebee"
«
Reply #14 on:
December 12, 2015, 09:57:10 AM »
sanjayrai55
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Don't wake a Tiger until you've factored the teeth
Re: Sunbird
Very nice, sir
Now I must build a power glider. Corro, 60" + + span >
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Sanjay - Gravity is my enemy
http://www.rcindia.org/rc-people/builds-i-have-posted-on-rci/
«
Reply #15 on:
January 02, 2016, 07:29:07 PM »
Bhanu Prakash
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Re: Sunbird
Nice build sir
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Reply #16 on:
January 03, 2016, 12:25:35 AM »
K K Iyer
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Re: Sunbird
@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 »
gaurang.1972
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Re: Sunbird
Excellent build iyer sir
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Reply #18 on:
March 25, 2016, 07:32:08 PM »
K K Iyer
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Sunbird update
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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Sunbird wing joiner
Here is a pic of the wing joiner/ dihedral brace to make the wing two piece to fit in a small car.
Sunbird wing joiner
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«
Reply #20 on:
March 25, 2016, 08:41:59 PM »
intorc
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Re: Sunbird
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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Re: Sunbird
@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.
Re: Sunbird
image.jpg
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Reply #22 on:
March 25, 2016, 09:36:42 PM »
intorc
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Re: Sunbird
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
Re: Sunbird
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
«
Reply #24 on:
March 25, 2016, 10:46:41 PM »
bmblb
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Re: Sunbird
Iyer Sir....you have just the right place to SLOPE !!! overlooking your flying field !
need I say more !
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"The Flight Of The Bumblebee"
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