Matronics Email Lists :: View topic

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

Flaperon Flutter

Matronics Email Lists Forum Index -> Kitfox-List

View previous topic :: View next topic

Author Message

chris(at)southernskies.ne
Guest

Posted: Mon Jun 23, 2008 3:24 am Post subject: Flaperon Flutter

I replaced the white nylon on the turtledeck with thicker Delrin and made it a nice, snug fit around the flaperon rod. It surprised me how much difference it made. Much of the up and down play is gone. I also reinforced the inboard and outboard hangar ribs.



There is another Kitfox at my airport and when we looked there we found one side of the nylon also cracked.



I will still replace all the hinge bushings and that should put me back in the air safely.......



Chris Bowles



KF3 Rotax 582





--

- The Matronics Kitfox-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?Kitfox-List

Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Mon Jun 23, 2008 4:43 am Post subject: Flaperon Flutter

I'm curious....how do you plan on replacing "all the hinge bushings?"  

Seems to me that the hinge tube, or spar as I've heard it called, is  

pretty much permanently fixed in place isn't it?



Lynn Matteson

Kitfox IV Speedster

Jabiru 2200

Status: flying w/530 hrs

do not archive



On Jun 23, 2008, at 7:19 AM, Southern Skies wrote:



 	  Quote: 	
		   

 <chris(at)southernskies.net>



 I replaced the white nylon on the turtledeck with thicker Delrin  

 and made it a nice, snug fit around the flaperon rod. It surprised  

 me how much difference it made. Much of the up and down play is  

 gone. I also reinforced the inboard and outboard hangar ribs.



 There is another Kitfox at my airport and when we looked there we  

 found one side of the nylon also cracked.



 I will still replace all the hinge bushings and that should put me  

 back in the air safely.......



 Chris Bowles



 KF3 Rotax 582

- The Matronics Kitfox-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?Kitfox-List

_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

chris(at)southernskies.ne
Guest

Posted: Sun Jun 29, 2008 11:45 am Post subject: Flaperon Flutter

Hello Listers,



I am happy to report that the cause of the flutter has been found. There were two factors that contributed, the broken turtledeck nylon bushings and the incorrect rigging. The A&P completely disassembled the entire linkage and found nothing wrong but did find the angle of incidence off a lot- the flaperons were working against each other and needed a bit of adjustment.



This might also have contributed to me having to push the stick (or pull up a lot on the flap handle) during climb out.



We also did a new W&B and all is well after machining a prop adapter that adds 3 lbs and moves the prop 2 inches forward.



Now the plane flies like a new bird, great. What a relief.



In the meantime I have been looking at a Kitfox 5 with an 0-200 with only 20 hrs TT on it. I like it because its bigger and has more room for long legs. Is there anything  particular to this combination? Fuel burn, STOL capability cruise speed and differences to the model 3 interest me.



Chris Bowles

KF 3 Rotax 582

- The Matronics Kitfox-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?Kitfox-List

Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Sun Jun 29, 2008 1:17 pm Post subject: Flaperon Flutter

During my building, I questioned the validity/importance of that  

skinny little flaperon/turtledeck nylon bushing, and most folks told  

me to put them on, and I'm glad I did. Sounds as though the broken  

bushings were at least a part of your problem..glad you found it.



Lynn Matteson

Kitfox IV Speedster

Jabiru 2200

Status: flying w/541 hrs





On Jun 29, 2008, at 3:42 PM, Southern Skies wrote:



 	  Quote: 	
		   

 <chris(at)southernskies.net>



 Hello Listers,



 I am happy to report that the cause of the flutter has been found.  

 There were two factors that contributed, the broken turtledeck  

 nylon bushings and the incorrect rigging. The A&P completely  

 disassembled the entire linkage and found nothing wrong but did  

 find the angle of incidence off a lot- the flaperons were working  

 against each other and needed a bit of adjustment.



 This might also have contributed to me having to push the stick (or  

 pull up a lot on the flap handle) during climb out.



 We also did a new W&B and all is well after machining a prop  

 adapter that adds 3 lbs and moves the prop 2 inches forward.



 Now the plane flies like a new bird, great. What a relief.



 In the meantime I have been looking at a Kitfox 5 with an 0-200  

 with only 20 hrs TT on it. I like it because its bigger and has  

 more room for long legs. Is there anything  particular to this  

 combination? Fuel burn, STOL capability cruise speed and  

 differences to the model 3 interest me.



 Chris Bowles

 KF 3 Rotax 582

- The Matronics Kitfox-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?Kitfox-List

_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

Display posts from previous:

	Matronics Email Lists Forum Index -> Kitfox-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum