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CJ6 Gill vanes tend to close at Higher IAS

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Ttail

Joined: 24 Jun 2013
Posts: 120

Posted: Sun Feb 18, 2018 12:37 pm Post subject: CJ6 Gill vanes tend to close at Higher IAS

I have M14PF installed on a CJ6. I used the original Housai Gill vanes and one of Doug's nose conversion rings. The cable between the hand control and nose ring was replaced around 12 months ago.



The issue I have is that with Gill vanes Full open accelerating through 140Kias the gill vanes close up to around the 2/3rd open position. Is there a way or something that can be adjusted that keeps the Gills in the selected full open position as IAS increases ?

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stephen.hayne

Joined: 01 Nov 2013
Posts: 59
Location: United States

Posted: Wed Feb 28, 2018 9:05 am Post subject: Re: CJ6 Gill vanes tend to close at Higher IAS

Question - how do you know how much they are closing?  Camera?  



My CJ gill vanes seem to be 3/4s open on the ground even after I rebuilt them to new limits.  IMHO, the vanes seem "flimsy" enough that I can easily imagine how they might close a little at higher airspeeds.  I do think that the angle they "rest" at is nicely aligned with the air coming off the propellor, which makes me think this angle is by design.



https://drive.google.com/open?id=1OC-TGaAggonunvo1hw7io5my4idDcmfLDg



Not sure what remedy there might be...

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Ttail

Joined: 24 Jun 2013
Posts: 120

Posted: Wed Feb 28, 2018 1:19 pm Post subject: Re: CJ6 Gill vanes tend to close at Higher IAS

Just looking at the Vane indicator and the hand grip you can see both move on their own accord. CHT increase soon follows.



Does varying the tension on the screw and spring in the control handle do anything or serve as any adjustment .... like a fiction type arrangement ?

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dougsappllc(at)gmail.com
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Posted: Mon Mar 05, 2018 1:47 pm Post subject: CJ6 Gill vanes tend to close at Higher IAS

Stephen,Check the wobblers (the little 90 degree arm on each vane).  They develop groves in them which catch on the shank of the bolts they pivot on.  This will cause the vanes to not open or close fully.  Another problem may be in the copper sheath which the control cable runs through.  The control cable is made up of a cable with a piece of stainless rod swaged to each end.  If the outer sheath has a kink or dent in it it may be preventing the shutter control cable from achieving full movement.  Try removing the control from the vane lever and see if you can close the vanes fully without the cable attached.

Doug

On Wed, Feb 28, 2018 at 9:05 AM, stephen.hayne <stephen.hayne(at)gmail.com (stephen.hayne(at)gmail.com)> wrote:

 	  Quote: 	
		  --> Yak-List message posted by: "stephen.hayne" <stephen.hayne(at)gmail.com (stephen.hayne(at)gmail.com)>

 

 Question - how do you know how much they are closing?  Camera?

 

 My CJ gill vanes seem to be 3/4s open on the ground even after I rebuilt them to new limits.  IMHO, the vanes seem "flimsy" enough that I can easily imagine how they might close a little at higher airspeeds.  I do think that the angle they "rest" at is nicely aligned with the air coming off the propellor, which makes me think this angle is by design.

 

 https://drive.google.com/open?id=1OC-TGaAggonunvo1hw7io5my4idDcmfLDg

 

 Not sure what remedy there might be...

 

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 _____(_)_____   666CJ

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=478319#478319

 

 

 

 

 

 

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Lancer

Joined: 21 Apr 2016
Posts: 30
Location: Cairns, Australia

Posted: Mon Mar 05, 2018 9:52 pm Post subject: Re: CJ6 Gill vanes tend to close at Higher IAS

I had a similar problem and pulled the winding mechanism apart and found the problem.



If you remove the handwheel and look at the face which contacts the body of the mechanism it should have 2 half moon (semicircular) lugs which sit into mating concaves in the body of the mechanism. Spring pressure holds the convex half moons in and locate it in place and stop the handwheel turning.



What had happened with mine was the half moons had worn down and there was no longer anything there to hold the wheel from turning. I tig welded and built up the half moons and filed them so they mated nicely into the concaves and it now holds perfectly.

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stephen.hayne

Joined: 01 Nov 2013
Posts: 59
Location: United States

Posted: Tue Mar 06, 2018 7:43 pm Post subject: Re: CJ6 Gill vanes tend to close at Higher IAS

Thanks, Doug - I replaced all the wobblers with new when I OH'd the vanes/gills.  Even without the cable attached, the vanes never seemed to open a full 90 from closed (on the bench or on the airplane).  No kinks or anything in the copper sheath.  I don't worry too much right now, because even in the heat of Colorado summer, I can mostly keep the CHT under 190.



 	  dougsappllc(at)gmail.com wrote: 	
		  Stephen,Check the wobblers (the little 90 degree arm on each vane).  They develop groves in them which catch on the shank of the bolts they pivot on.  This will cause the vanes to not open or close fully.  Another problem may be in the copper sheath which the control cable runs through.  The control cable is made up of a cable with a piece of stainless rod swaged to each end.  If the outer sheath has a kink or dent in it it may be preventing the shutter control cable from achieving full movement.  Try removing the control from the vane lever and see if you can close the vanes fully without the cable attached.

Doug

On Wed, Feb 28, 2018 at 9:05 AM, stephen.hayne <stephen> wrote:

 	  Quote: 	
		  --> Yak-List message posted by: "stephen.hayne" <stephen>

 

 My CJ gill vanes seem to be 3/4s open on the ground even after I rebuilt them to new limits.  IMHO, the vanes seem "flimsy" enough that I can easily imagine how they might close a little at higher airspeeds.  I do think that the angle they "rest" at is nicely aligned with the air coming off the propellor, which makes me think this angle is by design.

- The Matronics Yak-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List

_________________
-
Stephen Hayne, Cyber Security Consultant, Professor Emeritus (retired)
443LM Nanchang CJA
http://selfsynchronize.com/hayne/plane/cj6.asp

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