HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Mar 06, 2012, 02:55 PM
flapping flight maniac
krasitonev's Avatar
Joined Feb 2010
166 Posts
Discussion
Ornithopter Drive Unit

Drive # 0001 - means my first drive design materialized. It is not available on the market but since it is CAD designed and CNC manufactured it is not difficult to be replicated.The problem is machine shops' hour rates at about 70$ / h in US and the efficiency of the time spent.

This is a simple action, just up/down drive for powering of ornithopters with passively aerodynamically twisted wings. It can be tilted relatively to ornithopter's body and allows flying with thrust , flying with lift and the transition between them. Hopefully this will help for bird like take off - landing and will allow flying with very low speeds and even for hovering. Also depending on the speed and the strength of the tilting servo used, delayed - stall function for zero forward lending speed is possible.
The main design goals were : low friction - high efficiency, low noise generation,mechanical stability and durability,originality, testing of the "one-way bearing glide lock" idea and simplicity but as you can see at least the last one is not achieved at all. The drive is not tested in flight yet only is test benched.The electronic control system which has to stop the wings in desired gliding position and monitor , control and differ their up/down speeds is not ready yet.Also a few aluminum parts for connection between the drive and main spars have to be produced.

Main characteristics:

Flapping angle 60 degree, 45 degree up, 15 degree down
Flapping frequency 0 - 5.7Hz idle(only down stroke assisting springs loaded), 0 - 4.5Hz loaded.
Reduction ratio overall 75 , 3 stages 5*5*3 ,spur gears : Acetal/Delrin from Servolink, CNC modified ,hubless ,doubled on 2 nd(2*48P/60T) and 3 rd( 2*32P/36T) stages and single 48P/60T on 1 st stage.Pinions: steel 48P/12T on 1st and 2nd stages and steel 32P/12T on 3rd stage all pinions are press fitted.All spur gears are bolt mounted to the flanged aluminum shafts.
Motor 2300KV , 145W @11.1V , 34g
Speed controller 18A , 19g
Battery LiPo ,3S 11.1V, 800mA/h, 30C, 70g
Glide locking device - one way bearing
Overall weight : motor included 250g. Electronic control system weight approximately 5 - 8g is not included.
Materials used : Fiberglass G10 sheets 2.4mm and 1.8mm,Aircraft grade aluminum 7075 T651 ,Aircraft grade stainless steel 17-4 for most loaded shafts. Ball bearings for all moving or rotating joints and shafts,one way bearing for the glide - locking device. All bolts are M3 aluminum 7075 grade and are cuted to the exact necessary length and they are only tension loaded.

Tomorrow I will make a video on day light and with sound.I hope it will clear out how this thing works.
krasitonev is offline Find More Posts by krasitonev
Last edited by krasitonev; Mar 07, 2012 at 03:12 AM.
Reply With Quote
Sign up now
to remove ads between posts
Old Mar 06, 2012, 03:11 PM
Registered User
Joined Apr 2006
1,853 Posts
How it works ?
LifeisGood is online now Find More Posts by LifeisGood
Reply With Quote
Old Mar 06, 2012, 08:25 PM
Registered User
therealthing691's Avatar
australia
Joined Apr 2007
2,004 Posts
Quote:
Originally Posted by krasitonev View Post
Drive # 0001
Krasitonev do you have a video of this working also is this drive available on the open market what size motor does it use ? Any infomation world be greatly appreciated regards Brian
therealthing691 is offline Find More Posts by therealthing691
Reply With Quote
Old Mar 07, 2012, 02:51 PM
flapping flight maniac
krasitonev's Avatar
Joined Feb 2010
166 Posts
There is the video and few more pictures
Ornithopter Drive (3 min 24 sec)
krasitonev is offline Find More Posts by krasitonev
Reply With Quote
Old Mar 07, 2012, 05:01 PM
Registered User
G-LO's Avatar
Va.Beach VA.
Joined Aug 2007
1,876 Posts
Very interesting unit! Can't wait to see what you have in mind for this drive unit...
G-LO is online now Find More Posts by G-LO
Reply With Quote
Old Mar 07, 2012, 08:08 PM
Registered User
therealthing691's Avatar
australia
Joined Apr 2007
2,004 Posts
Quote:
Originally Posted by G-LO View Post
Very interesting unit! Can't wait to see what you have in mind for this drive unit...
+10 great job Krasi regards Brian
how is your bambo bird coming along cheers Brian
therealthing691 is offline Find More Posts by therealthing691
Reply With Quote
Old Mar 07, 2012, 09:03 PM
Registered User
Joined Apr 2006
1,853 Posts
Looking real good, thanks for the postings. I guess you will need a rather large wings to keep the device airborned, good luck and keep us informed of the progress.
LifeisGood is online now Find More Posts by LifeisGood
Reply With Quote
Old Mar 08, 2012, 12:15 AM
flapping flight maniac
krasitonev's Avatar
Joined Feb 2010
166 Posts
Thank you everybody for the good words.It is true that my drive is probably more complicated that is necessary and this results in more heavy weight but is so stable mechanically and powerful enough that will handle 2m wings' span bird with ease and I hope I wont have problems to make it flyable.
Bamboo edgy bird project is frozen for the moment. Thanks to "Festo",LIG, Dr. Kakuta,Kanai,Sam,Robert and a lot of other guys here (I apologize for missing somebody) my taste evolved to the bird like ornithopter models and especially seagull looking models.That's why I mentioned LIG,Kakuta and Festo first.
Here is some pictures illustrating the "new wave" in my taste.
The quality of craftsmanship isn't high and it is build from scratch materials but this body is build only for illustration of the idea and actual fuselage will be larger,more carefully made and from specially bought materials .
I will be pleased to hear your opinions - does it look close enough to the real seagull?Thanks in advance and enjoy !
krasitonev is offline Find More Posts by krasitonev
Last edited by krasitonev; Mar 08, 2012 at 12:37 AM.
Reply With Quote
Old Mar 08, 2012, 06:11 AM
There's magic in those wings !
khaled_abobakr's Avatar
Joined Nov 2006
4,706 Posts
Hi ..

It is indeed very clever of you to use the sponge in the neck and tail .. so clever . ... also this is nothing less than fine craftsmanship .. even if it won't fly .. ... but I hope it will and I'm sure you will make it if it won't

Khaled
khaled_abobakr is offline Find More Posts by khaled_abobakr
Reply With Quote
Old Mar 08, 2012, 06:17 AM
DIY Mania from Taiwan
Taiwan
Joined Aug 2011
1,834 Posts
That is truely impressive,and nicely built indeed,thanks for sharing
some seagull pics,FYI
best regards
Sam
00000017509
samwei1950 is online now Find More Posts by samwei1950
Reply With Quote
Old Mar 08, 2012, 08:21 AM
Registered User
therealthing691's Avatar
australia
Joined Apr 2007
2,004 Posts
i think its great krasi keep us informed i think you will do a great job regards brian
therealthing691 is offline Find More Posts by therealthing691
Reply With Quote
Old Apr 20, 2012, 12:10 PM
Registered User
Joined Apr 2006
1,853 Posts
Looking good.
LifeisGood is online now Find More Posts by LifeisGood
Reply With Quote
Old Apr 20, 2012, 01:10 PM
Registered User
France, PACA, Marseille
Joined May 2010
38 Posts
Very nice
nono1928 is offline Find More Posts by nono1928
Reply With Quote
Old Apr 20, 2012, 05:04 PM
There's magic in those wings !
khaled_abobakr's Avatar
Joined Nov 2006
4,706 Posts
Amazing Krasi... Amazing ... . I can feel the fine quality ... Please make it fly soon

Khaled
khaled_abobakr is offline Find More Posts by khaled_abobakr
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Passive articulated ornithopter wings Velko Velkov Ornithopters 2 Feb 24, 2012 09:40 PM
Sold Gws ips direct drive unit ArtJ Aircraft - Electric - Power Systems (FS/W) 0 Jan 11, 2012 07:34 PM
For Sale Du-Bro Prop Drive unit inpieces Aircraft - Fuel - Engines and Accessories (FS/W) 0 Dec 07, 2011 10:47 PM
Sold Trex 500 Flybarless head, swash, 3G unit & drive gear assembly 5478Jimmy Aircraft - Electric - Helis (FS/W) 4 Oct 06, 2011 04:35 PM
Discussion Perhaps a revolutionary(?) idea for a new ornithopter wing drive system GreenAce92 Ornithopters 36 Jun 28, 2010 07:22 PM