RC India
Welcome Guest, please login or register.
 
Pages: [1]   Go Down
0 Members and 1 Guest are viewing this topic. Topic Tools Topic Tools 
Read
« on: August 24, 2011, 11:43:29 PM »
Deepu5292
Plane Lover
Active Member

**

Reputation Power: 1 
Deepu5292 has no influence.
Offline Offline

City: coimbatore
State: Tamil Nadu
RC Skills: Beginner
Posts: 17
Join Date: Jul, 2011




Hi everyone!!
      I'm planning to build an ornithopter for a competition in iit madras.I had decided to follow the design of kestrel ornithopter but unfortunately I was not able to find any plans of that design. so i'm designing my own ornithopter.I'll list the specifications,materials I have choosen to work with,techniques and drawings. I request the forum experts Help Me to go through it and correct me in case of any faults in my design or the materials I have choosen.

(p.s: I'm a beginner in RC and a dummy in electronics Head Scratching so please don't mind)

SPECIFICATIONS:
wing span: 30 inches
overall length:15 inches
frequency of beats: 5 beats/second
control: 3CH (two tail functions using servos and one main wing motor)
overall weight(including Lipo) : 300g (expected)
MATERIALS USED:
main body: carbon fiber plates of 2mm thickness
wing spars and stiffeners: carbon fiber rods of 3mm diameter
wing membrane: Mylar sheet
glues: Araldite(for joining the CF rods) and fevibond (for sticking the wing membrane yo the CF rods)
gears : nylon
shafts: steel rods of 5mm dia
misc: derlin bushes and micro ball bearings
ELECTRONICS:
Main motor: MOTOR DY 2812-14 1400KV(RC FOR ALL BRUSHLESS)
ESC: 20A ESC(rc for all)
Tail servos:two metal gear 15gram servos from rc for all
Tx and Rx : FLYSKY 2.4Ghz 4ch
battery: 7.2v Lipo 800mah 2c

          I also have a doubt,please don't mind if it is very silly Giggle. I need only 300 rpm at my output shaft, as you can see the motor I've choosen runs around
10000 rpm,using gear reduction to reduce the speed will increase my weight as the ratio is around 33:1. i need a solution for this problem.Will I be able to control the max rpm of motor by setting the max speed in the ESC at a lower value?

(p.s: this is my first RC project)

                                                                                                  Thank you! 

Logged

- Deepu
 

Read
« Reply #1 on: September 11, 2011, 06:28:13 PM »
Deepu5292
Plane Lover
Active Member

**

Reputation Power: 1 
Deepu5292 has no influence.
Offline Offline

City: coimbatore
State: Tamil Nadu
RC Skills: Beginner
Posts: 17
Join Date: Jul, 2011



guys, I'm desperate here.... Help Me Help Me Help Me
Logged

- Deepu
 

Read
« Reply #2 on: September 11, 2011, 08:16:06 PM »
sunk?
Boat Lover
Forum Veteran

****

Reputation Power: 6 
sunk? has no influence.
Offline Offline

City: Bristol. UK
State: OUTSIDE INDIA
RC Skills: Intermediate
Posts: 458
Join Date: Jan, 2010



hi mate.
that is usualy done using the tx in heli mode, then you can set your own revs at any piont in the throttle range ...usualy 5 piont adjustment.
regards
don
Logged

regards
don
UK
 

Read
« Reply #3 on: September 12, 2011, 09:37:33 PM »
Deepu5292
Plane Lover
Active Member

**

Reputation Power: 1 
Deepu5292 has no influence.
Offline Offline

City: coimbatore
State: Tamil Nadu
RC Skills: Beginner
Posts: 17
Join Date: Jul, 2011



Thanks for the reply sir, but the Tx I'm having is a cheap one and doesn't have that facilities Cry Undecided
Logged

- Deepu
 

Read
« Reply #4 on: September 12, 2011, 10:20:05 PM »
SunLikeStar
Forum Administrator
Forum Hero

*****

Reputation Power: 20 
SunLikeStar barely matters.SunLikeStar barely matters.
Offline Offline

City: Pune
State: Maharashtra
RC Skills: Intermediate
Posts: 1902
Join Date: Aug, 2010

High spirits we have: gravity we flout.



Hi Deepu,
You'll have to use gear reduction. Contrary to what you are thinking, gear reduction will actually reduce weight. That motor you have cannot move you wings, it will most probably burn out within seconds. It just doesn't have enough torque. Now to get more torque there are two options; either use a bigger motor or use gear reduction. Using gears is going to be many times lighter than getting a bigger motor. So basically there is no escaping the gears for what you are trying to achieve!  
Logged
 

Read
« Reply #5 on: September 13, 2011, 06:07:35 PM »
Deepu5292
Plane Lover
Active Member

**

Reputation Power: 1 
Deepu5292 has no influence.
Offline Offline

City: coimbatore
State: Tamil Nadu
RC Skills: Beginner
Posts: 17
Join Date: Jul, 2011



Thank You sunlikestar, work in progress, I'll post my build and maiden flight soon. Smiley Smiley Smiley
Logged

- Deepu
 

Read
« Reply #6 on: September 13, 2011, 06:15:51 PM »
sunk?
Boat Lover
Forum Veteran

****

Reputation Power: 6 
sunk? has no influence.
Offline Offline

City: Bristol. UK
State: OUTSIDE INDIA
RC Skills: Intermediate
Posts: 458
Join Date: Jan, 2010



hi mate,
you need something like a main gear from a small heli.....esky lama perhaps.....
then you attach your wing rods to the big gear and put a small 'pinion on the motor to drive the gear
think of a steam engine wheels... they have a 'crank' that connects the big wheels well that is what you wing rods will be they will  be ... .
  both on one rod/bolt like this....lighter.........only one rod/bolt.........
the 'crank' the wing rods are on will be your gear instead. giving you the slower turn for the wings
http://www.instructables.com/image/FGLR6JQFT7PLBV9/Ornithopter.jpg
My ornithopter


regards
don


« Last Edit: September 13, 2011, 06:38:36 PM by sunk? » Logged

regards
don
UK
 

Read
« Reply #7 on: September 13, 2011, 06:53:16 PM »
Deepu5292
Plane Lover
Active Member

**

Reputation Power: 1 
Deepu5292 has no influence.
Offline Offline

City: coimbatore
State: Tamil Nadu
RC Skills: Beginner
Posts: 17
Join Date: Jul, 2011



The flapping wing mechanism I've chosen is a little different from your rubber band powered model, but the concept remains the same. I have attached a file showing the flapping wing mechanism. As you can the gears are facing sideways, I believe that these sideways facing gears will act as gyros and provide stability, assisting the straight flight of the ornithopter. Please correct me if I'm wrong Smiley Smiley

Kestrel side view.jpg
Re: My ornithopter
* Kestrel side view.jpg (11.67 KB, 360x182 - viewed 9026 times.)
Logged

- Deepu
 

Read
« Reply #8 on: September 13, 2011, 07:22:47 PM »
sunk?
Boat Lover
Forum Veteran

****

Reputation Power: 6 
sunk? has no influence.
Offline Offline

City: Bristol. UK
State: OUTSIDE INDIA
RC Skills: Intermediate
Posts: 458
Join Date: Jan, 2010



hi mate.
that was just an illustration from the web with the rubber band drive to show the mechanics. did you see how far from the spindle center the wing rods are?
you will need the ball joint farther away from the center to give a 'min 45 degree' 'flap' on the wings...that looks very close to the center spindle of the gear.  or the wings will need to flap too fast.
the gears will not be spinning fast enough to give any real stability and be too small, but there will be less wind resistance with them in line with the frame like that..
regards
don
Logged

regards
don
UK
 

Read
« Reply #9 on: September 16, 2011, 08:43:53 PM »
Deepu5292
Plane Lover
Active Member

**

Reputation Power: 1 
Deepu5292 has no influence.
Offline Offline

City: coimbatore
State: Tamil Nadu
RC Skills: Beginner
Posts: 17
Join Date: Jul, 2011



Hello sir,
         Sorry for the late reply.The ornithopter in the picture I've posted previously is the "KESTREL" designed by Sean Kinkade. Unlike what you think it produces a 50 degree flap. The ball joint on the top is attached to the wing spar very close to wing spar's pivot point, so a very small off set of the bottom ball joint from the spindle is sufficient to produce the 50 degree flap. I have two large gears in my design( OD:70mm, Weight:30 grams each) and one of them will be spinning at 1250 rpm(at max speed of the motor). My ornithopter weighs around 300 grams. Is the gyroscopic effect produced by the gear too small to stabilize my ornithopter. Just thought that some specifications would help you to help me.
Logged

- Deepu
 

Read
« Reply #10 on: April 01, 2012, 05:49:16 PM »
Deepu5292
Plane Lover
Active Member

**

Reputation Power: 1 
Deepu5292 has no influence.
Offline Offline

City: coimbatore
State: Tamil Nadu
RC Skills: Beginner
Posts: 17
Join Date: Jul, 2011



Sorry for the very late update friends!!!
 Glide test:



Test stand video:



maiden flight:
       

 
Logged

- Deepu
 

Read
« Reply #11 on: April 01, 2012, 06:29:07 PM »
Swapnil
Plane Lover
Forum Hero

*****

Reputation Power: 20 
Swapnil barely matters.Swapnil barely matters.
Offline Offline

City: Pune
State: Maharashtra
RC Skills: Beginner
Posts: 1751
Join Date: May, 2010

Retreat, Hell!



Wow! Good job mate!   Clap
Logged
 

Read
« Reply #12 on: April 01, 2012, 07:24:08 PM »
mirmoazam
Heli Lover
Active Member

**

Reputation Power: 1 
mirmoazam has no influence.
Offline Offline

City: Bangalore
State: Karnataka
RC Skills: Beginner
Posts: 50
Join Date: Dec, 2011

Airbus Military A400M - Future of Transporters



Great job. Best of luck for the competition
Logged

My hangar includes
1. Align T Rex 450
2. Nine Eagles Mini Cessna(Sky Eagle)
3. Guillow's Fairchild 24
4. Sky Surfer
5. FS-TH9X
 

Read
« Reply #13 on: April 01, 2012, 08:21:44 PM »
RcBazaar
Heli Lover
Forum Hero

*****

Reputation Power: 9 
RcBazaar has no influence.
Offline Offline

City: Bangalore
State: Karnataka
RC Skills: Advanced
Posts: 664
Join Date: Jan, 2011



GREAT build deepu...  Clap
all the best to you
Logged

 

Read
« Reply #14 on: April 01, 2012, 10:11:04 PM »
Sumeet
Rise and rise again until lambs become lions...
Plane Lover
Forum Hero

*****

Reputation Power: 7 
Sumeet has no influence.
Offline Offline

City: Nagpur
State: Maharashtra
RC Skills: Beginner
Posts: 540
Join Date: Oct, 2010



Well done mate...!

 Salute

Good luck for the competition. Please let us know whatever happens in competition.

Cheers.
Logged

<<<<<<<SUMEET>>>>>>>>
 

Read
« Reply #15 on: April 01, 2012, 10:18:18 PM »
rohitgupta322
Plane Lover
Forum Hero

*****

Reputation Power: 12 
rohitgupta322 has no influence.
Offline Offline

City: Illinois, USA
State: OUTSIDE INDIA
RC Skills: Beginner
Posts: 986
Join Date: Feb, 2010



Brilliant, post some more videos please. Looks so beautiful and best of luck for the competition.
Logged

Be Inquisitive
 

Read
« Reply #16 on: April 02, 2012, 11:56:31 AM »
SunLikeStar
Forum Administrator
Forum Hero

*****

Reputation Power: 20 
SunLikeStar barely matters.SunLikeStar barely matters.
Offline Offline

City: Pune
State: Maharashtra
RC Skills: Intermediate
Posts: 1902
Join Date: Aug, 2010

High spirits we have: gravity we flout.



Congratulation Deepu5292 on successful build and maiden. Please post some close up pictures of important parts like gear assembly, main wing hinge, tail section etc..
Logged
 

Read
« Reply #17 on: April 02, 2012, 06:41:12 PM »
Deepu5292
Plane Lover
Active Member

**

Reputation Power: 1 
Deepu5292 has no influence.
Offline Offline

City: coimbatore
State: Tamil Nadu
RC Skills: Beginner
Posts: 17
Join Date: Jul, 2011



Thank you guys for your support Grin Grin
Unfortunately I was't able to participate in the competition at IIT M because my model wasn't complete at that time.
But I did participate in the sp4mm3r of IIT KANPUR  a few months back in an event named "EAGLE". The objective of the event was to build an unconventional flying model of any sort.
My model still wasn't flying because there were some major problems with the wing sail. But I decided to participate.
Fate gave me the toughest opponent I could possibly imagine. The only other college student in India to my knowledge, with a flying orni model(and a good one too) in hand was my competitor. He had also won the same event last year.
His name is Joydeep bhowmik.He is doing his M Tech in IIT K. He is also a member of this forum and also have started a thread about his work. His model RAVEN was light years ahead of my model. Raven was a beautiful slow flapper that graciously rounded the skies of IIT K.
Even though I was his competitor he was very sportive and gave me some useful advice about the mechanics of an ornithopter, which proved to be very helpful lately.
He was definetly an Inspiration to me next to Mr Nandakumar sir Grin Grin

@Sun like star: I do have the pictures of the gear assembly... etc but their sizes are more than 200 KB each so I'll upload them in a photo sharing website and post the link.  

fuselage.jpg
Re: My ornithopter
* fuselage.jpg (38.87 KB, 800x600 - viewed 8202 times.)
This post has 2 more images(s)/attachment(s). Please login or register to view them.
Logged

- Deepu
 

Read
« Reply #18 on: September 24, 2012, 06:32:45 PM »
deepak5491
Heli Lover
Active Member
**

Reputation Power: 1 
deepak5491 has no influence.
Offline Offline

City: pauri india
State: Uttaranchal
RC Skills: Beginner
Posts: 1
Join Date: Sep, 2012



where i can get the material for ornithopter project........please help me.
Logged
 

Read
« Reply #19 on: September 24, 2012, 07:59:56 PM »
rchero
Heli Lover
Active Member
**

Reputation Power: 1 
rchero has no influence.
Offline Offline

City: Mohali
State: Chandigarh
RC Skills: Intermediate
Posts: 11
Join Date: Sep, 2012



wow man what a flying machine  Clap
Logged
 

Read
« Reply #20 on: July 14, 2016, 02:24:07 PM »
biswajit
Heli Lover
Active Member
**

Reputation Power: 1 
biswajit has no influence.
Offline Offline

City: rourkela
State: Orissa
RC Skills: Beginner
Posts: 1
Join Date: Feb, 2016



I am designing a foldable ornithopter. can you suggest me how to perfprm aerodynamic analysis of it? Any software?
Logged
 

Read
« Reply #21 on: July 14, 2016, 11:37:29 PM »
K K Iyer
Global Moderator
Forum Hero
*****

Reputation Power: 50 
K K Iyer is on the verge of being accepted.K K Iyer is on the verge of being accepted.K K Iyer is on the verge of being accepted.K K Iyer is on the verge of being accepted.K K Iyer is on the verge of being accepted.
Offline Offline

City: Indore
State: Madhya Pradesh
RC Skills: Intermediate
Posts: 4209
Join Date: Jan, 2012



@biswajit sir,
Welcome to RCI, since this is your first post.

Curious about a few things in your post. Perhaps you may like to clarify.
1. Whats a folding ornithopter?
2. When you ask for 'aerodynamic analysis', what exactly are you looking for?

One of our local flyers, and RCI member (lugosgaurav) successfully flew an ornithopter last year. Video is there on RCI. He's now with an aerospace company. Try to PM him for assistance with your project.

Regards.
Logged
 

Read
« Reply #22 on: August 15, 2019, 01:22:01 PM »
Varun_nithish
Plane Lover
Active Member
**

Reputation Power: 1 
Varun_nithish has no influence.
Offline Offline

City: Coimbatore
State: Tamil Nadu
RC Skills: Beginner
Posts: 4
Join Date: Aug, 2019



Where you buy these parts for your project
Logged
 

Pages: [1]   Go Up
Jump to:  

Related Topics
Subject Started by Replies Views Last post
Ornithopter « 1 2  All »
Kites, Trains, Free Flight and All Others
anandtr2006 48 20145 Last post March 06, 2018, 02:47:47 PM
by ash
NEED AN ORNITHOPTER
Wanted
ali 1 885 Last post August 10, 2016, 10:29:04 PM
by el ricardo
ornithopter ..... i'm new at here
Kites, Trains, Free Flight and All Others
shashi bhushan 1 1351 Last post December 26, 2016, 05:40:31 PM
by ash
how to make ornithopter
Self-designed, DIY and College Projects
ash 12 3534 Last post December 31, 2017, 06:41:18 PM
by ash
Does any one have a ornithopter?
Wanted
Mohammed Naveed 3 563 Last post January 24, 2018, 08:05:17 PM
by Aravind298