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Elevator and joystick throw

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smgates

Joined: 13 Apr 2019
Posts: 13
Location: Perth, Australia

Posted: Fri Jun 28, 2019 10:12 pm Post subject: Elevator and joystick throw

Hi all,



I've just finished building my Firestar II tandem and in the process of test flying. One thing that the person test-flying initially has noted is that the elevator authority feels a little limited, and 'spongy' feel at either extreme. Flying here in W Australia can be very turbulent and windy much of the time and he feels an improvement in the elevator authority would be useful.



The joystick has a cable pivot point separation of 3" and the elevator control horn a cable pivot separation of 4". So we are thinking of increasing the joystick pivot separation to around 4" also. However, this would mean having to raise the front of the seat about 1/2".



Has anyone found a similar problem and if so how did you address it?



Thanks

Steve

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Gator

jhauck36(at)outlook.com
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Posted: Sat Jun 29, 2019 3:38 am Post subject: Elevator and joystick throw

Gator/Kolbers:



I haven't heard of this problem before.  Usually elevator function is right on set up the way the plans and instructions indicate.



Elevator cables need to be tight.  A tiny bit of slack in the elevator cables will produce a lot of slop in fore and aft movement of the control stick.



Geometry should be right on unless someone has changed it from the stock set up.



Get someone to lock the elevator in place.  Snug the elevator control cables until there is no play, fore and aft, in the control stick.



You will be surprised how much this will improve elevator authority.  



That's what I have discovered.  That's what I did to correct the problem.



We recently made this correct to Larry Cottrell's FSII.  I flew it loose, corrected, and flew it tight.  Flew like a new airplane after that.



John h

MKIII

Baldwinsville, NY





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Richard Pike

Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee

Posted: Sat Jun 29, 2019 4:06 am Post subject: Re: Elevator and joystick throw

I would also help the perceived elevator authority if you gap seal the elevator to the stabilizer.

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_________________
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0

Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.

racerjerry

Joined: 15 Dec 2009
Posts: 202
Location: Deer Park, NY

Posted: Sat Jun 29, 2019 5:36 am Post subject: Re: Elevator and joystick throw

I built a very early Firestar II.  I was kinda' disappointed that control cables NOW rubbed on the bottom of the fuselage tube at the forward end.  In the Kolb Newsletter of July 1, 1995, Kolb suggested the addition of a control cable fairlead made from Lexan sheet to keep control cables from rubbing on the aluminum tube.



I got fed up and added a second row of 4 control cable pulleys to one of the fuselage cross tubes to raise the cables and to enable me to properly tension the elevator cables without fear of sawing either aluminum or Lexan.



Dunno' if my mod was necessary or even advisable, but it worked for me.  Things may have changed since then.



Jerry King

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Jerry King

byoungplumbing(at)gmail.c
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Posted: Sat Jun 29, 2019 4:31 pm Post subject: Elevator and joystick throw

 	  Quote: 	
		  Before I started messing with cable locations I would put Vortex generators underneath the horizontal stabilizer  in front of the hinge area and see if that increase your Authority I did that to my Mark 3 and it made a significant difference. 	




The v gs that I bought were stolspeed from John Gilpin in Australia.   Try

https://stolspeed.com/installing-vortex-generators



Boyd Young

Mkiii Utah

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Rex Rodebush

Joined: 10 Jan 2006
Posts: 209
Location: Branson West area, Missouri

Posted: Mon Jul 01, 2019 7:15 am Post subject: Re: Elevator and joystick throw

I did the same as Boyd (v.g.'s on my elevator) and also had much better control when landing.  Seemed much more stable and responsive.

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byoungplumbing(at)gmail.c
Guest

Posted: Mon Jul 01, 2019 10:53 am Post subject: Elevator and joystick throw

 	  Quote: 	
		   If you buy the stole Speed The Vortex generators read the instructions. Without looking I believe they  go 4 inches in front of the elevator hinge on the bottom of the horizontal stabilizer, and I believe you use the 30 mm spacing. 	




Boyd Young

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ceengland7(at)gmail.com
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Posted: Mon Jul 01, 2019 11:57 am Post subject: Elevator and joystick throw

And most importantly, don't get caught.

 

 Sent from BlueMail 

 On Jul 1, 2019, at 1:55 PM, B Young <byoungplumbing(at)gmail.com (byoungplumbing(at)gmail.com)> wrote: 	  Quote: 	
		    	  Quote: 	
		   If you buy the stole Speed The Vortex generators read the instructions. Without looking I believe they  go 4 inches in front of the elevator hinge on the bottom of the horizontal stabilizer, and I believe you use the 30 mm spacing. 	




Boyd Young

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