Team RCU - Don Szczur Ask your questions directly to Don Szczur, proffesional pattern pilot

KE mixes

Reply
Old 01-01-2008, 12:08 PM
  #1
stek79
Thread Starter
 
Join Date: Apr 2005
Location: , ITALY
Posts: 625
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default KE mixes

Hello Don,
happy new year!

Recently I read the very good trimming tutorial written by Peter Goldsmith. In that article, he recommends to setup the KE mixes doing simple rudder turns: he state that the mixes then will be right even for KE flight. If that doesn't occur, i.e. the mixes are not correct in KE flight, the problem might be a surface (rudder) blow-back.

These days I'm trying to setup the mixes in that way, in a small pattern aircraft. Actually I've found that, for me, that way doesn't work. I can setup almost perfect mixes that enable very flat rudder turns (low rate rudder) but when I put the plane on its side, there are unwanted rolling and pitch tendencies...

The question is: how do you set your KE mixes? In your experience with pattern planes, the mixes set during flat turns are correct for KE flight?

Thanks in advance
stek79 is offline  
Reply With Quote
Old 01-01-2008, 12:11 PM
  #2
krayzc-RCU
 
Join Date: Mar 2002
Location: Kannapolis, NC
Posts: 7,415
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KE mixes

listening
krayzc-RCU is offline  
Reply With Quote
Old 01-03-2008, 04:56 AM
  #3
Don Szczur
 
Don Szczur's Avatar
 
Join Date: Jan 2002
Location: Chantilly, VA
Posts: 1,969
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: KE mixes

Stek,

You can do this as long as your low rate rudder is low enough. Many planes exhibit differing amounts of adverse yaw with rudder inputs. Sometimes this is non-linear on high and in 3D rates. On an Edge 540 I had it would go to the belly first then the canopy as the rudder stick went further to the limit and much more pronounced at high rate. Multi-point mixing took care of that. Depending on the design of the pattern plane, keep your rudder throw to just barely hold knife edge and Peter's trimming technique should work fine. Also if the CG is at the rearward side, it can make pitching more pronounced.

I switch to high rate for hammer heads and that tightens them up. I also set up rudder mix for 3 seconds max knife edge- since that is the normal max I fly in that position in manuevers (Knife edge loop in F09 being the exception).

I cover/demonstrate rudder throw and mix in detail in my upcoming IMAC/3D instructional video- which may be helpful to some pattern setups as well. Stay tuned.
Don Szczur is offline  
Reply With Quote
Reply


Thread Tools
Search this Thread
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -8. The time now is 10:16 AM.