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Old Sep 27, 2012, 02:46 AM
Inspired by the wings of an An
Andycap's Avatar
Leeds
Joined Mar 2003
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I'm still in the should I ,shouldn't I stage as my ability in F3P-B is limited but love my Glavak products I already have
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Old Oct 01, 2012, 11:38 AM
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Lantsov Alexey's Avatar
Russian Federation, Saint Petersburg, St Petersburg
Joined Jan 2009
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Set for a model to 100 grams of weight, got 12.7 grams.(мотоr 18x3)
For models up to 200 grams 16.4 grams.(motor 22x3)
Good luck to all!
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Old Oct 04, 2012, 04:31 PM
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Russian Federation, Saint Petersburg, St Petersburg
Joined Jan 2009
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For the coaxial system made ​​propellers 10x3.
With the motor 22х3 weight 21.3 grams.
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Old Oct 04, 2012, 04:34 PM
"Free" in Christ! #F3P
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United States, CA, SF
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Sweet!

How will you mount it??

Free
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Old Oct 04, 2012, 04:56 PM
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Russian Federation, Saint Petersburg, St Petersburg
Joined Jan 2009
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Center model carbon tube.
Insert into the tube model
http://www.rcgroups.com/forums/showp...&postcount=316
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Old Oct 06, 2012, 05:27 PM
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Russian Federation, Saint Petersburg, St Petersburg
Joined Jan 2009
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The coaxial system installed.
You can see how it works.
Kimmo thanks for the idea.
Соосная система в работе . (0 min 31 sec)
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Old Oct 06, 2012, 06:08 PM
RC Bum 4 Hire
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United States, NM, Albuquerque
Joined May 2004
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Very cool! thanks for sharing.

Chris
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Old Oct 06, 2012, 06:09 PM
"Free" in Christ! #F3P
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Neat!

Flight vid??

Does your system completely cancel out torque?

Free
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Old Oct 08, 2012, 08:45 PM
Foamies for life! #f3p
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Wow nice!!
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Old Oct 09, 2012, 04:42 AM
TheyreComingToTakeMeAway!
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USA, ID, Coeur D'Alene
Joined Dec 2003
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Quote:
Originally Posted by Free View Post
Neat!

Flight vid??

Does your system completely cancel out torque?

Free
because the props are not geared or directly driven by one another, the net force will be close to zero, only bearing drag goes to the airframe.
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Old Oct 10, 2012, 01:53 AM
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Lantsov Alexey's Avatar
Russian Federation, Saint Petersburg, St Petersburg
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Quote:
Originally Posted by derk View Post
because the props are not geared or directly driven by one another, the net force will be close to zero, only bearing drag goes to the airframe.
Made its first flight.
The system works very well.
Compare flight with coaxial and one propeller.
Big difference in the flight no.
In each version, you should be able to fly.
полёт соосника (1 min 32 sec)
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Old Oct 10, 2012, 10:42 AM
Foamies for life! #f3p
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WOW, that preforms REALLY nice!! Good Work!!


Not Free
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Old Oct 10, 2012, 05:38 PM
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Sverige, Östergötlands Län, Linköping
Joined Mar 2011
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Here are some pictures of another corunner design.

I have played with contras in F3P since 2010. My first motor was a dual outrunner at 28g turning double APC 10X3.8 props (pic attached). It worked well but was just too heavy. When Kimmo and Seppo posted their work on a slipringed outrunner I realized that this was the way to go. I built a prototype last winter and it worked perfect. I flew it in an old Donuts Nexus, but for this winter I have “bolted” it to my Symmetric. The motor weighs 21.0 grams with dual 10 inch props and pulls about 270g at 6.5A. Next motor I will wind for lower Kv as this is too much. The motor is extremely silent and I can do 2 schedules on a 130mah pack. My Symmetric with this setup weighs 101g rtf. Barely more then with the single prop setup I had before. I’m truly enjoying the result. Thanks Kimmo!

/David
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Last edited by David Lundstrom; Oct 10, 2012 at 06:03 PM.
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Old Oct 10, 2012, 05:39 PM
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Lantsov Alexey's Avatar
Russian Federation, Saint Petersburg, St Petersburg
Joined Jan 2009
262 Posts
After testing the system with a brush, I saw problemma.
1 brush creates friction moment.
2. Brushes should be controlled for system reliability.
3. There is a loss of electricity in the collector.
I suggest to see my idea with a differential system.
Differential of can be done in many ways.
It shows a variant version of the wheel.
The blue color of the fixed .
Red color rotate
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Old Oct 10, 2012, 07:09 PM
"Free" in Christ! #F3P
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United States, CA, SF
Joined Jan 2012
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Quote:
Originally Posted by David Lundstrom View Post
Here are some pictures of another corunner design.

I have played with contras in F3P since 2010. My first motor was a dual outrunner at 28g turning double APC 10X3.8 props (pic attached). It worked well but was just too heavy. When Kimmo and Seppo posted their work on a slipringed outrunner I realized that this was the way to go. I built a prototype last winter and it worked perfect. I flew it in an old Donuts Nexus, but for this winter I have “bolted” it to my Symmetric. The motor weighs 21.0 grams with dual 10 inch props and pulls about 270g at 6.5A. Next motor I will wind for lower Kv as this is too much. The motor is extremely silent and I can do 2 schedules on a 130mah pack. My Symmetric with this setup weighs 101g rtf. Barely more then with the single prop setup I had before. I’m truly enjoying the result. Thanks Kimmo!

/David
That's AWESOME!

Do you have any more pics of both systems?

Thanks,

Free
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