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Old May 21, 2005, 08:08 AM
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Vincent Lee's Avatar
Seoul, Korea
Joined Mar 2001
104 Posts
10 inch span micro RC ornithopter

Hi, as I mentioned before, here is a spec and some pictures for our new 10 inch span RC ornithopter. This one has flown for more than 10 min under 0-2m/s wind condition.

Wing span: 26cm
RTF weight: 23g
motor/power: M20-HV, 0.8A x 7V = ~6W max
gearbox: didel 10mm modified, 16:1
lever/crank ratio: 2.67:1 (crank R = 6mm)
flap angle: +34, -10 degree
battery: 145mA x 2 cells
Receiver/ESC: RFFS-100 + 2 cell converter

Hope this helps.

Vincent & Jin-Wook Lee
Seoul, Korea
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Last edited by Vincent Lee; May 24, 2005 at 08:35 AM.
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Old May 21, 2005, 11:01 AM
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massimo's Avatar
Joined Nov 2001
1,118 Posts
wawwwwww very very nice job
Dear Vincent ,when you will give we a video of your wonderful job?

Thanks
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Old May 22, 2005, 10:45 AM
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Vincent Lee's Avatar
Seoul, Korea
Joined Mar 2001
104 Posts
The video I have is too large to post here. Whenever I have a chance, i will try to take some short videos.

Vincent
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Old May 22, 2005, 03:02 PM
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Joined Sep 2003
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Excellent design. Is it slow enough to fly in a living room? How well does it respond to rudder commands? What is your next goal?
GB
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Old May 22, 2005, 03:21 PM
Nathan Chronister
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Joined Jun 2003
626 Posts
Did you try using a single cell and M20-LV motor before you went to 2 cell system?
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Old May 23, 2005, 06:21 AM
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Vincent Lee's Avatar
Seoul, Korea
Joined Mar 2001
104 Posts
Indoor Version

The above model is for outdoor flying (under 0-3m/s wind), although it also flies well in indoor. The rudder is very efficient. I was flying very tight figure 8's and circles of about 4-5m diameter. Our model #2 has elevator control also (using a 0.6g small actuator), which has better control, especially in outdoor.

Before I use 2 cells and HV motor, I tried 1 cell (145mA) with M20-LV motor. This one was very slow, and I think this 1 cell setup is ideal for indoor flying. See the picture below. Specs are: 28cm wingspan, 16g RTF weight, 21:1 gear ratio.

In addition to these models, we have built even smaller model with 22cm wing span. This one uses Nathan's gearbox and 6mm motor, along with 1-2cells of 80mA Li-Po. It weighs 13.4g with 2 cells. We are still fine tuning the model, as it flies only 20 seconds so far.

Vincent
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Old May 24, 2005, 12:52 AM
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pdawg's Avatar
United States, OH, Dayton
Joined Apr 2004
5,558 Posts
Your bird looks pretty small! I heard the competition was going to be held sometime in May. How did your Orni perform in the 2005 MAV competition?
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Old May 24, 2005, 02:20 AM
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Vincent Lee's Avatar
Seoul, Korea
Joined Mar 2001
104 Posts
2005 MAV competitions held in Seoul

My 12 year old son brought our 26cm span model to the local MAV competition, and won the 1st prize at the Junior's competition. The wind was very strong at the competition day (1-5m/s), and he managed to fly only for 2 min. If I were a pilot, I am sure the flight time could have been much longer despite the wind.

Two weeks later (May 21), at the same place (somewhere in Seoul), there was a 9th international MAV competition, which includes very exciting ornithopter pylon mission. We did not participate the competition, as this is mainly for the University students. But there were several interesting micro ornithopters with 19.5cm - 32cm wing spans. Univ. of Arizona team won the 1st prize with their amazing 20-21cm wingspan ornithopters by making some 15-20 figure 8's in 2 min time assigned for this mission!! 2nd place went to the Korean team (Inha Univ.), who flew equally amazing 28cm span model to complete some 15 figure 8's also in 2 min. If we entered the competition with our 26 cm span model (our model #2 with rudder & elev. controls), we could have probably completed some 10 figure 8's within the same time, judging from our previous experiences.

See the pictures at the following site:

http://www.imavc.com/bbs/zboard.php?id=photoview

Cheers,

Vincent & Jin-Wook
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Last edited by Vincent Lee; May 24, 2005 at 08:35 PM.
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Old May 24, 2005, 11:33 AM
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United States, OH, Dayton
Joined Apr 2004
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Thanks for all those great pictures of the competition.
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Old May 25, 2005, 01:58 AM
Master of Flapping Flight
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Tucson AZ, USA
Joined Apr 2004
42 Posts
Here is University of Arizona MAV team ornithopter.
Max size 195mm / 7-3/4"
Total weight 12gr
RC - modified RFFS-100 for 2 cell
8.4V 60 mAh
MK10-7 pager motor
custom built 18:1 gearbox with original transmisison
Modified Bob Baily muscle wire activator.
It was the only MAV with muscle wires on this competition.
It was surprize to see that Vincent came up with the same idea for fuselage. Actually, I don't know who was first.
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Old May 25, 2005, 04:11 AM
Registered User
Gainesville, Fla
Joined Aug 2002
125 Posts
The first day I saw arizona's little ornithopter the tail was mounted normaly, the next day at the competion it was mounted inverted.
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Old May 25, 2005, 11:30 AM
naX
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United States, CO, Grand Junction
Joined Jun 2004
254 Posts
So, how much for one of these little guys?
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Old May 25, 2005, 10:49 PM
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Vincent Lee's Avatar
Seoul, Korea
Joined Mar 2001
104 Posts
It costs less than $160 per each bird (RX+actuator ~$100, didel gear ~$25, motor $7, battery $15-20, carbon rod, balsa, plastic film, wire ~few $).

Hiperion (Bill?), why don't you post more detailed pictures of your little bird? I was very impressed by the flight characteristics of your model.

Vincent
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Last edited by Vincent Lee; May 26, 2005 at 12:05 AM.
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Old May 26, 2005, 08:14 AM
Nathan Chronister
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Joined Jun 2003
626 Posts
If you want to go the commercial route, I would recommend the Plantraco sub-gram rx system. It costs a little more than Vincent's setup, but it looks great. I haven't actually used it yet though. Soon I'll have to buy one and put it in the Eagle 2 kit to see how that works. The Eagle 2 should be available next week, by the way! All I need is to finish drawing up the plans.

Nathan
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Old May 26, 2005, 09:13 AM
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Vincent Lee's Avatar
Seoul, Korea
Joined Mar 2001
104 Posts
The Plantraco 0.9g Rx system looks really cool for the indoor model. I am also planning to use it for the next model. It appears though that it works only with 1 cell and may not appropriate for the outdoor version which usually requires 2 cells to fight the wind.

Nathan, I am looking forward to seeing your new Eagle 2. Do you use a magnetic actuator for the rudder control? Your 6mm 27:1 gearbox appears to be ideal for the indoor model with ~30cm wing span. For the smaller model (like my 22cm wingspan), I would prefer a bit lower gear ratio (say 12:1 ~ 20:1) for higher falp frequency.
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