HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Oct 16, 2012, 03:19 PM
Cranky old fart
Balr14's Avatar
Germantown, WI.
Joined Oct 2007
21,470 Posts
Tightening the flybar intentionally would be very unusual. It would impede head movement. I'm not sure how TBE got into the discussion, but basically it's a change in the air flow between the flybar and rotor head, it occurs once every rotation and it only occurs with 45 flybar helis. Since it only occurs, with a 45 flybar, that would impy that it's related to mixing the out-of-phase condition, which makes sense. So, either there's a momentary change in phasing or in the values being mixed. That seems to suggest something is too tight, too loose, or worn, in either the flybar or the rotor head, or the linkage. Good luck finding it! Of course, this theory is only good until somebody proves it wrong... but it's held up for a few years now.
Balr14 is offline Find More Posts by Balr14
Last edited by Balr14; Oct 16, 2012 at 04:14 PM.
Reply With Quote
Sign up now
to remove ads between posts
Old Oct 16, 2012, 04:37 PM
Sir Crashalot
stonecutter's Avatar
Joined Oct 2011
2,252 Posts
I'm not saying it's a good thing, but tightening the flybar does indeed make the flybar less effective in self stabilization, which is one way to make the heli go faster. You can verifiy easily for yourself, you can even make it so tight as to immobilize it (but make sure it is horizontal), the heli would be almost impossible to fly w/ the stock tx like that, but possible w/ a programmable tx (kkddmm has modded and flown flybarless v911's, however, he takes out the flybar completely though, making the process non-reversible). With the flybar immobilized, the swash tilt translate into blade pitch w/o any damping, so unless you have super fast thumbs, a programmable tx is a must.

Making the flybar tighter but still movable introduces delayed pitch commands to the blades, which is what I theorize to cause the pendulum, and perhaps TBE (I tend to think of TBE as a 2-d pendulum).
stonecutter is offline Find More Posts by stonecutter
Last edited by stonecutter; Oct 16, 2012 at 06:02 PM.
Reply With Quote
Old Oct 16, 2012, 05:21 PM
Registered User
United States, KS, Wichita
Joined May 2010
62 Posts
In my limited helicopter experience. When I have used Xtreme head parts on my Solo Pro 328, I have ended up with TBE, rolling over during turns, and total loss of self correction, when the flybar has been to tight. Not even to tight that I can't move it easily, just enough that you can feel the drag. On both the metal head, and the plastic head, I have had to install the screws until they began to induce drag, then unscrew the until there was 0 drag.
livingword26 is offline Find More Posts by livingword26
Reply With Quote
Old Oct 17, 2012, 09:38 AM
Registered User
Air Vaca's Avatar
Arivaca,Arizona
Joined May 2008
7,715 Posts
I've noticed with 45` flybars, you need to "re-assert" your command for FFF. A 90`head/flybar will keep going, until you stop it. A 45` stops on it's own.
Air Vaca is offline Find More Posts by Air Vaca
Reply With Quote
Old Oct 21, 2012, 08:38 AM
Get to the choppa!
RFDelie's Avatar
United States, PA, Pittsburgh
Joined Sep 2012
358 Posts
I think the heli flies better with a tighter flybar. I like it to be tight enough that it does not roll around when holding the heli and doing a slow sway, but moves when you sway quickly. It just seems to fly and stop better, I know my flybar is loose when I start getting the rocking when I I stop.
RFDelie is offline Find More Posts by RFDelie
Reply With Quote
Old Oct 21, 2012, 10:39 AM
Cranky old fart
Balr14's Avatar
Germantown, WI.
Joined Oct 2007
21,470 Posts
Quote:
Originally Posted by Air Vaca View Post
I've noticed with 45` flybars, you need to "re-assert" your command for FFF. A 90`head/flybar will keep going, until you stop it. A 45` stops on it's own.
Absolutely! The purpose of a 45 flybar is to damp movement. Since it effectively reduces remaining movement by 1/2 (depending on linkage) every rotation, it will stop soon enough. The V911 flybar has lots of latency, too.
Balr14 is offline Find More Posts by Balr14
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion slow forward flight v911 hilewannabe Micro Helis 11 Apr 07, 2014 09:47 PM
Gallery FPV Y-6 Fast Forward Flight, Chasing Planes and 4x4s... with a collision Adidas4275 FPV Aircraft 1 Apr 05, 2012 01:37 AM
Fast Forward Flight on Hummingbird? Manchild Micro Helis 10 Jun 02, 2003 02:06 AM