New Products Flash Sale
Thread Tools
This thread is privately moderated by mnowell129, who may elect to delete unwanted replies.
Old Dec 23, 2014, 12:57 PM
tourist_603 is offline
Find More Posts by tourist_603
Registered User
Joined Dec 2007
217 Posts
Seek and you shall find; ask and it shall be given unto you. This is a wonderful resource. Now that I know where to look and what to look for, I'm off to look up the article and see if it looks feasible to go on the build list.
tourist_603 is offline Find More Posts by tourist_603
Reply With Quote
Sign up now
to remove ads between posts
Old Jun 02, 2015, 04:34 AM
gadily is offline
Find More Posts by gadily
Registered User
Joined Mar 2005
25 Posts
Why does the SuperG autogyro needs the rotor head tilt to the left?

Hi all,
Looking at the SuperG autogyro manual I found "critical note" that says that rotor head must be tilted 7 deg to the left.
Also I found in the manual trouble shooting section that if the model rolls to the right is due to the rotor head not pre angled to the left…
I have flown few times my HK 2 Auto G2 gyrocopter.
At take-off phase the model rolls sharply to the left without exception.
The rotor angular bias was zero deg. (Please see attached photos and video clip)
https://www.youtube.com/watch?t=43&v=OM79DZ463c4
According to my aerodynamic understanding the SuperG gyrocopter should roll to the left after take-off.
Both models have CCW rotor angular movement.
The advancing blade on the right side "sees" both airspeed
And linear speed while the retreating blade on the left side "sees" the difference of airspeed and linear speed.
This difference between the blades "produces" roll moment to the left.
May one of you please explain me why the SuperG manual requires that rotor head must be tilted 7 deg to the left
gadily is offline Find More Posts by gadily
Reply With Quote
Old Jun 02, 2015, 08:16 AM
mnowell129 is offline
Find More Posts by mnowell129
Mickey from Orlando. Really.
Joined Nov 2004
4,145 Posts
Quote:
Originally Posted by gadily View Post
May one of you please explain me why the SuperG manual requires that rotor head must be tilted 7 deg to the left
Coning.
This is a heavy model. This causes the blades to cone up. The coned rotor will roll to the advancing blade. The correction is to trim away from the advancing blade, in this case to the left.
http://www.rcgroups.com/forums/showp...3&postcount=26
mnowell129 is offline Find More Posts by mnowell129
Reply With Quote
Old Jun 03, 2015, 09:03 AM
gadily is offline
Find More Posts by gadily
Registered User
Joined Mar 2005
25 Posts
Thank you mnowell129 for your reply.
I computed the disk loading of the Super G .vs. AG2 autogyros.
I looks that as you noted that Super G is much more disk loading (1.8 Kg/m2 .vs. 1.28 Kg/m2)
Although the AG2 has lighter disk loading is has smaller blade cone (But not zero)
How do you explain the the AG2 autogyro rolls sharply to the left without exception.
(Ground and hand launch always strong left roll)
gadily is offline Find More Posts by gadily
Reply With Quote
Old Jun 03, 2015, 12:04 PM
mnowell129 is offline
Find More Posts by mnowell129
Mickey from Orlando. Really.
Joined Nov 2004
4,145 Posts
Quote:
Originally Posted by gadily View Post
Thank you mnowell129 for your reply.
I computed the disk loading of the Super G .vs. AG2 autogyros.
I looks that as you noted that Super G is much more disk loading (1.8 Kg/m2 .vs. 1.28 Kg/m2)
Although the AG2 has lighter disk loading is has smaller blade cone (But not zero)
How do you explain the the AG2 autogyro rolls sharply to the left without exception.
(Ground and hand launch always strong left roll)
Not sure. Mine doesn't.
Torque does play into it some.
Also if the rotor is not completely up speed, all bets are off.
Perhaps some pictures and video of your exact setup might help.
Does it level out after it's moving?
mnowell129 is offline Find More Posts by mnowell129
Reply With Quote
Old Jun 26, 2015, 09:21 AM
gadily is offline
Find More Posts by gadily
Registered User
Joined Mar 2005
25 Posts
Sorry for the late response.
some flights I could make level out.
The last hands-launches it was totally impossible to level out.
Next flight I am going to use flight stabilizer and 2-3 deg right rotor tilt .
gadily is offline Find More Posts by gadily
Reply With Quote


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
zagi advice, questions, answers easy2fly Foamies (Kits) 61 Dec 11, 2009 04:38 AM
T-rex fuselage questions and answers. darthdrk Mini Helis 9 Jul 11, 2005 04:41 PM
Tiny-X Building - Tips, Questions, Answers, and Pictures Manchild Parkflyers 264 Dec 09, 2002 08:25 PM
Tiny-X Building - Tips, Questions, Answers, and Pictures Manchild Batteries and Chargers 2 Oct 31, 2002 11:28 AM
Didel Questions and Answers Gordon Johnson Scratchbuilt Indoor and Micro Models 2 Sep 03, 2002 01:31 PM