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«
on:
October 10, 2015, 09:55:34 PM »
K K Iyer
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Sunbird
Tweet
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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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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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
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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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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"
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Reply #14 on:
December 12, 2015, 09:57:10 AM »
sanjayrai55
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Re: Sunbird
Very nice, sir
Now I must build a power glider. Corro, 60" + + span >
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Sanjay - Gravity is my enemy
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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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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
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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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Reply #25 on:
March 25, 2016, 11:21:24 PM »
K K Iyer
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Re: Sunbird
Quote from: intorc on March 25, 2016, 09:36:42 PM
May be a silly question but does it also apply in swept wings too?
Unless its a jet, i expect a cellotape on the wing joint would be enough.
In olden times, we used to stick a pin into the top spar of each wing, and connect with a small rubber band...
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Reply #26 on:
August 04, 2016, 10:07:13 PM »
K K Iyer
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Sunbird. Power reqmt.
There is an ongoing discussion in RC Groups about the power needs of the Sunbird.
Copying my today's RCG post here, as may interest RCI members building a Sunbird.
(Pics/video excluded as already available in this thread)
How much power for Sunbird...
Hi,
I thought my Sunbird was pretty. Till I saw the others in this thread.
Mine is 450gms/16oz. Rudder, elevator, throttle. No ailerons.
Two piece wing with 6" hardwood dihedral brace/joiner.
Has an Emax 2805 with a 5-6" prop label, indicating it is 2840kv.
However, must be a 1600kv, as near full throttle (fearfully reaching 150+ watts) indicated 15000+ rpm on 3s and a 6x3 prop that has an HY logo.
Soldered parallel JST and XT60 connectors to ESC, to enable use of 2&3 cell.
Used a 1000mah 3s to avoid tail heaviness.
Balances at spar, about 40-45mm from LE.
Easy take off at half throttle. About 50- 60watts. 9-10,000rpm.
Or about 50 fps.
Above half throttle, a tendency to loop!
Corrected presently by mixing 5% down elevator into top half of throttle range!
Bet no one tried that before
So the lessons i learnt:
1. 60watts is enough for a nice climb
2. CG could be moved aft 10-20mm behind spar (and decalage reduced, and down elevator mixing to throttle removed). Will try on Sunday if weather permits.
Here's a pic, and a brief video. See if you can spot power cut at about 22 seconds, rest in lift!
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Reply #27 on:
August 04, 2016, 10:34:53 PM »
K K Iyer
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Re: Sunbird
Here's a pic and the video anyway, to save you the trouble of going back to page 1
Re: Sunbird
image.jpg
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Reply #28 on:
August 05, 2016, 08:07:56 AM »
sundaram
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Re: Sunbird
450 gms at that wingspan
. Awesome build sir. Looking beautiful. Must surely be a pleasure to fly. The shape of the Wing always deterred me from getting one for me. Wondering no build issues you encountered.
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Sandy's Hangar and Introduction
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Reply #29 on:
August 05, 2016, 10:00:25 AM »
sanjayrai55
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Don't wake a Tiger until you've factored the teeth
Re: Sunbird
Great stuff, Iyer saheb
Quote from: sanjayrai55 on December 12, 2015, 09:57:10 AM
Very nice, sir
Now I must build a power glider. Corro, 60" + + span >
Now you know who inspired the Fournier
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Sanjay - Gravity is my enemy
http://www.rcindia.org/rc-people/builds-i-have-posted-on-rci/
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Reply #30 on:
September 28, 2016, 08:46:02 PM »
K K Iyer
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Re: Sunbird
Haven't come across anyone in RCI flying the Hobbyking Sunbird, so most of my posts on the subject have been on RCG!
In case there is someone here flying a Sunbird, he/(she) may find this useful
Since there is no instructions booklet, just some pictures, CG location has to be guessed at.
So far I'd been flying with CG 45mm from LE (just ahead of spar)
Following inputs in RCG, moved CG back to 55mm this Sunday.
The improvement is amazing.
No more tendency to drop nose in turns. Absolutely flat glide hands off and power off.
So nice that RC Aunt (who hadn't flown RC in over a year), snatched the Tx from me!
Till I snatched it back after 8 minutes!
The video is however only 30seconds, ended by our dog who considers the iPad a competitor for attention, and so hates it...
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November 12, 2016, 08:55:30 PM »
K K Iyer
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Re: Sunbird
Sunbird with GPS and altimeter. No audio vario though...
Tomorrow, hope to get data on
1. Altitude
2. Upwind/ downwind ground speed via GPS
Re: Sunbird
IMG_0699.jpg
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Reply #32 on:
November 17, 2016, 10:29:44 PM »
K K Iyer
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Telemetry on Sunbird
Results from last Sunday:
Well, there's some good news, and some bad.
The good news is that the altimeter showed that reaching 400ft is easy.
Now the bad news.
1. Flying the model, and reading the data display can't go together.
I'm 63, wear -7 glasses and bifocals. Once I focus on the display, i lose sight of the model completely. Needed shouts from wife and friends to locate it again...
2. Ground speed as per GPS varied from 46 to 72kmph. Didn't sound right...
3. Had a temp sensor, so taped it to the ESC (12a, 1a BEC). Noticed the temp display climbing rapidly. At 57 deg C (ambient 28C) I decided to land urgently. Found that the ESC's plastic wrapping had melted and peeled off...
4. Removed all sensors and hub. Had no difficulty flying. No heating, nothing.
The question now is:
How much power are the hub and 3 sensors drawing? (GPS, Alt, Temp). Are they (and 2 x 9gm servos) cooking the 1a BEC? Rx voltage even showed 4.9 instead of the usual 5.0!
Lessons learnt:
1. Need separate power supply for hub/sensors
2. Need full time copilot to monitor display (and toggle between 3 screens) to get any useful data
Regards
Edit: meanwhile waiting for sanjayrai55's Griffin to be completed...
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Reply #33 on:
November 18, 2016, 05:50:36 AM »
sanjayrai55
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Re: Sunbird
Iyer sir, you are much more than 63
Wisdom of a 100 and that stuff
It has been so long since I flew an Orange Box (nearest approximation to the Griffin I can think) that I have
quite
forgotten what one is supposed to do
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Sanjay - Gravity is my enemy
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Reply #34 on:
February 02, 2020, 09:06:16 PM »
K K Iyer
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Re: Sunbird
Decided to fly the Sunbird, the only fixed wing airplane I registered with Dgca.
Mostly flown by RC Aunt.
Today she said she can hear a sound.
Which wasn’t there before.
Checked that prop is balanced. It was.
Removed the motor, washed it in water, dried it and oiled it.
I guess the front bearing is suffering from dust intake.
I think it’s time to replace the bearings. Has had 50 or more flights.
Can someone please tell me what size the bearings on an eMax2805 are, and where to get them?
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Reply #35 on:
February 03, 2020, 05:44:43 AM »
sanjayrai55
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Re: Sunbird
Miniature bearings are difficult to get. Nagdevi Street in Bombay is the only one I know of; you would need to take the sample. Or if you know ID/OD/Height and type of bearing (eg Single Race, one side metal shield) you can cross-reference
Much easier to replace the motor!
In most cases a good cleaning and oiling works for unshielded bearings
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Reply #36 on:
February 03, 2020, 05:46:06 AM »
sanjayrai55
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Re: Sunbird
If you let me know ID/OD/Height I might have lying around. I got some assorted sizes a few years ago
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Reply #37 on:
February 03, 2020, 03:15:36 PM »
manu
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Re: Sunbird
I remember my first scratch built. It was a fusion of the flight test tiny trainer (940mm wing span) and an avispad (ruggedness) with an aspect ratio of 5:1 chord:span. The final AUW of the plane was/is 780-90 grams. Had real trouble flying it , broke around 10-15 props until I could fly it for at least 3-4 minutes at full throttle and as a cherry topping, the airfoil turned out to be a symmetrical one (the boons of using corro) although I wanted it to be a clark y. I still use that wing on a much lighter fuse, goes vertical at times
. The thing learnt : wing loading/CWL matters a lot. 450 grams for sunbird is just awesome. Bearing could be greased and you may find bearings of coaxial helicopters at novelty bazar in Indore, not sure about the sizes though.
last time I flew it by using a 1000mah 3s lipo and that old wing with the yellow fuselage. the flight time was very low and the battery felt like jelly after the flight.
Re: Sunbird
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