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Old Feb 21, 2013, 03:50 AM
Natural flight
Devabird's Avatar
Joined Oct 2012
10 Posts
Balance

Quote:
Originally Posted by Kazu-kaku View Post
Thank you. I will fly Butterfly20-3 in order to judge whether this method is effective.
Very good work indeed Kazuhiko, I am sure you will get good results.

I see that your battery is in the "tail", that's important for those who want to make ornithopters. On the one I am finishing I had to spend some time to find the good balance, and the best place for the battery was unexpectedly... almost under the tail !
According to my last experience, before trying the first flapping wing fly, it is important to send the ornithopter with fixed wings (without wind if possible), it should glide, at least a bit. If it falls directly, one has to rearrange the parts to change the gravity center, or watch the profile of the wings.
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Old Feb 21, 2013, 06:29 AM
K Kakuta
Kazu-kaku's Avatar
Joined Aug 2006
1,126 Posts
Quote:
Originally Posted by Devabird View Post
Very good work indeed Kazuhiko, I am sure you will get good results.

I see that your battery is in the "tail", that's important for those who want to make ornithopters. On the one I am finishing I had to spend some time to find the good balance, and the best place for the battery was unexpectedly... almost under the tail !
According to my last experience, before trying the first flapping wing fly, it is important to send the ornithopter with fixed wings (without wind if possible), it should glide, at least a bit. If it falls directly, one has to rearrange the parts to change the gravity center, or watch the profile of the wings.
Thank you.
In the ornithopter that has not a tail, a center of gravity becomes considerably back.
Therefore, there is the case that a position of battery becomes in a tail.
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Old Feb 21, 2013, 10:04 AM
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Joined May 2011
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Quote:
Originally Posted by Devabird View Post
Very good work indeed Kazuhiko, I am sure you will get good results.

I see that your battery is in the "tail", that's important for those who want to make ornithopters. On the one I am finishing I had to spend some time to find the good balance, and the best place for the battery was unexpectedly... almost under the tail !
According to my last experience, before trying the first flapping wing fly, it is important to send the ornithopter with fixed wings (without wind if possible), it should glide, at least a bit. If it falls directly, one has to rearrange the parts to change the gravity center, or watch the profile of the wings.
Hi Devabird , A long time ago i want to ask you what kind is this nice bird on your avatar ? If you have larger picture or link please post it .
Thanks in advance!
Otto
About the tail role will write later now the time is limited
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Old Feb 21, 2013, 11:00 AM
Natural flight
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Joined Oct 2012
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Quote:
Originally Posted by seagull10 View Post
Hi Devabird , A long time ago i want to ask you what kind is this nice bird on your avatar ? If you have larger picture or link please post it .
Thanks in advance!
Otto
About the tail role will write later now the time is limited
Sorry, I can't find it anymore at the moment.
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Old Feb 23, 2013, 05:54 PM
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Originally Posted by Devabird View Post
Sorry, I can't find it anymore at the moment.
Thanks
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Old Feb 24, 2013, 05:47 PM
K Kakuta
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Joined Aug 2006
1,126 Posts
Puffin29iV with KJELL wiggle Drive: Flapping test

Puffin29iV with KJELL wiggle Drive: Flapping test

GosHawk29iV with KJELL wiggle Drive: Flapping test (2 min 29 sec)


This system is heavy (10g UP).
But the flapping is very smooth.
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Old Feb 24, 2013, 09:05 PM
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amazing work Doctor and functions very well regards Brian
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Old Feb 24, 2013, 10:17 PM
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Joined May 2011
691 Posts
Good choice and work Doctor, The weight can be optimized by designing (more slimmer)and CNC-ing instead of printing plastic parts.Also the width of mechanism seems can be reduced and weight of the transverse CF plates and steel axle will decrease. POM is maybe the best(for the purpose) material between plastics but 7075 aluminum will work better.
IMO at least on "Z" shaft it's good ball bearings to be used. The other two axes will work satisfactory on sliding bushings (the speed is low and the motion isn't fully rotational ) .Teflon is the plastic with the lowest coefficient of friction between commercially available plastics and it's used most frequently for manufacturing of bearing bushings.
Success
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Old Feb 24, 2013, 10:18 PM
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Indonesia, East Java, Malang
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Excellent

Excellent Mr. Kakuta..

regards Slachem
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Old Feb 25, 2013, 01:11 AM
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I think this is not KJELL wiggle Drive.
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Old Feb 25, 2013, 01:19 AM
K Kakuta
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Joined Aug 2006
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Quote:
Originally Posted by Velko Velkov View Post
I think this is not KJELL wiggle Drive.
KJELL made these parts of Wiggle drive with a 3D printer and sent it to me.
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Old Feb 25, 2013, 01:48 AM
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485 Posts
Quote:
Originally Posted by Kazu-kaku View Post
KJELL made these parts of Wiggle drive with a 3D printer and sent it to me.
This is new KJELL wiggle Drive ?
What is the sense ? The wing movement is only flapping.
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Old Feb 25, 2013, 02:12 AM
Kjell Dahlberg
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Mallorca Spain
Joined Nov 2005
1,111 Posts
Thanks Kazu.
The design of your first prototype looks good. After testing it, I am shore you can reduse the weight. What flapping frequesy are you using?
New Kjell Wiggle Drive0 (1 min 16 sec)
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Old Feb 25, 2013, 02:21 AM
K Kakuta
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Joined Aug 2006
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Quote:
Originally Posted by KJELL View Post
Thanks Kazu.
The design of your first prototype looks good. After testing it, I am shore you can reduse the weight. What flapping frequesy are you using?
http://www.youtube.com/watch?v=36SUWofNHKA
I do not yet know flapping frequesy.
I will know it when wings are finished and I fly the ornithopter.
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Old Feb 25, 2013, 02:40 AM
Kjell Dahlberg
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Mallorca Spain
Joined Nov 2005
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The Wiggle Drive is made for fast flapping. Smaller wings can be used.
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