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Old Nov 21, 2012, 10:40 PM
JOHN 3:16
Sammy70's Avatar
Central Ohio
Joined Feb 2008
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Instead of the spinning rotor blades remaining in a completely flat plane, they flex upwards slightly creating a slight "V" shape...
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Old Nov 21, 2012, 10:49 PM
|Taranis|>|All other Tx's|
scott page's Avatar
United States, WA, Richland
Joined May 2009
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Quote:
Originally Posted by Sammy70 View Post
Instead of the spinning rotor blades remaining in a completely flat plane, they flex upwards slightly creating a slight "V" shape...
What's the effect on flight?
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Old Nov 21, 2012, 11:09 PM
JOHN 3:16
Sammy70's Avatar
Central Ohio
Joined Feb 2008
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When the spinning blades begin to lift the heli/autogyro they cone upward due to the weight of the aircraft pulling down on the central mast.

A little coning is similar to adding dihedral to a flat wing.

There's more to it than that, but that's all I remember from A&P school
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Old Nov 21, 2012, 11:22 PM
Sky's not the limit, ground is
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USA, CA, San Jose
Joined Dec 2007
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A very basic explanation would be that it has a similar effect as dihedral. There is a lot of other aerodynamic phenomena going on but that's boring stuff to read.
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Old Nov 22, 2012, 11:40 AM
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Denmark, Capital Region of Denmark, KBH
Joined Jul 2009
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On coning and other stuff, you should read mnowell129's excellent detailed explanations in the thread Gyrocopter Aerodynamics
As I recall, we need the head to flex in order to allow the blades to flap and to allow for a control equivalent to cyclic on a heli, without large forces on the servos. Flapping is required to cancel out the difference in lift between the blades moving at different airspeeds in the headwind.
Coning is a different thing and is not really wanted - it reduces stability and efficiency. This is why you often have lead near the blade tips to make the centripetal force reduce the coning.
Anyway, this is a can of worms that I am not really qualified to discuss, so listen to Mick Nowell.
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Old Nov 22, 2012, 12:16 PM
Stress Be Gone
GBR2's Avatar
Snohomish, WA
Joined May 2000
3,410 Posts
How do you locate the spares for the Auto-G? I've tried the search function but I'm either not putting in the correct description or whatever. Would be nice if HK put a link to the various spare parts available on the same page as the model description.
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Old Nov 22, 2012, 12:39 PM
Keep it simple
alfoot's Avatar
Salisbury,England
Joined Jan 2005
976 Posts
Here you go:-

http://www.hobbyking.com/hobbyking/s...1mm_Parts.html

Al
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Old Nov 22, 2012, 02:00 PM
Proud of Brushless Sprouts
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Belgium, Flanders, Antwerp
Joined Feb 2007
328 Posts
Found this on the French HK Facebook page, they call it l'auto-G Mad Max.
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Old Nov 22, 2012, 03:45 PM
Sky's not the limit, ground is
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USA, CA, San Jose
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Very clever
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Old Nov 22, 2012, 04:08 PM
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Quote:
Originally Posted by skydanz View Post
A very basic explanation would be that it has a similar effect as dihedral. There is a lot of other aerodynamic phenomena going on but that's boring stuff to read.
Sorry, but you are perpetuating a myth.
Coning does not aid stability at all, in fact it causes roll due to the different airflow over that blades when they are at the 12 and 6 o'clock positions. At 12 o'clock the blades have an increased angle of attack compared to the blades at 6 o'clock due to the a larger component of the rearward airflow (due to the forward motion) appearing as an "upward" or "through the rotor disk" flow.
PeterOGB
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Old Nov 22, 2012, 04:44 PM
Sky's not the limit, ground is
skydanz's Avatar
USA, CA, San Jose
Joined Dec 2007
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Quote:
Originally Posted by PeterO_UK View Post
Sorry, but you are perpetuating a myth.
Coning does not aid stability at all
PeterOGB
Um, OK
There is a long standing debate on CONING that has become more of an inside joke. I was perpetuating the joke. Sorry guys, I won't do that again.
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Old Nov 22, 2012, 05:55 PM
Registered User
Boondocks, East Coast, USA
Joined Jun 2003
648 Posts
Are you guys holding some right aileron during the ROG take off run to compensate for the left roll tendency at rotation?
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Old Nov 22, 2012, 06:00 PM
Be here now!
ask21!'s Avatar
Rome,Ciampino
Joined Jan 2008
172 Posts
Quote:
Originally Posted by Wolfman View Post
Are you guys holding some right aileron during the ROG take off run to compensate for the left roll tendency at rotation?
There is any tendency to roll left if the rotor is spinning at the right rpm. So, no, any left roll applied.
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Old Nov 22, 2012, 06:58 PM
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Elizabeth South Australia 5113
Joined Nov 2005
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The inportant think is that the blades are up to speed prior to ROG. If they are not,then the model will roll on to it's left side.So if the blades are up to speed then no right roll is needed.
It is best to try to maintain a level disk at ROG.The biggest problem is that UP elevator is applied to early.When the blades are up to speed ,then the model will rise as the power is slowly applied.
A gentle hand launch is suitable for this size of model as it gives your model height and air speed and you can feel and here the pull on the rotors .
Chris..........
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Old Nov 22, 2012, 07:32 PM
It was a GLITCH! Honestly!
SafeLandings's Avatar
Stourport on Severn ,Worcestershire, United Kingdom
Joined Dec 2007
4,865 Posts
Quote:
Originally Posted by PeterO_UK View Post
Sorry, but you are perpetuating a myth.
Coning does not aid stability at all, in fact it causes roll due to the different airflow over that blades when they are at the 12 and 6 o'clock positions. At 12 o'clock the blades have an increased angle of attack compared to the blades at 6 o'clock due to the a larger component of the rearward airflow (due to the forward motion) appearing as an "upward" or "through the rotor disk" flow.
PeterOGB
Agreed!...I tested this a few years back and it adds unwanted roll but can be trimmed out, stability does come into effect but only because the CG position of the rotors is moved upwards and in theory generates a longer mast. A longer mast adds stability but reduces roll sensitivity.
It is impossible to eliminate cone but the less the better, especially in windier conditions.

From time to time this does come up but if you read the sticky at the top f the page then it is explained better.


'To cone or not to cone'.....that is the question



Regards
Rich
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