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Tip-Up Canopy Query

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dwight(at)openweave.org
Guest

Posted: Mon May 21, 2007 12:24 pm Post subject: Tip-Up Canopy Query

I am currently working my way slowly through the canopy frame fitting

exercise. It is going well (after a long delay due to a kitchen remodel

that took 3 months) but I'm not -quite- there, and want advice.



In general the fit along the split between the forward top skin and the

skin on the canopy frame is good. At least the amount of gap is good. As

I move out from the center, past where the 'goose-neck hinges' go, the

canopy frame skin starts to ride a little high. In the center I have it

shimmed so that it is intentionally a little high, of course, to clear

the forward skin. But along those curves leading down to the side of the

fuselage I need to either lower the canopy frame skin, or shim up the

forward skin. Either works for me.



On the left-hand side (facing forward) it is almost perfect. I have less

than 1/64th of an inch of gap and am quite happy. On the right-hand side

(again, facing forward) I'm not so happy. I have about 1/16th of an inch

of gap and I'd like to close that a bit. 



A suggestion I got from Scott Risan was to shave down the canopy frame 

bow along the front such that there is less distance for the skin to

cover, and thus pulling that problem edge down lower. I have done that

a _tiny_ bit, but before I shaved more off of the frame I thought I'd

solicit any other input from the collected wisdom of the list. If I can

close that 1/16 inch gap, I'll call it good enough and will be ready to

drill the hinges and move on.



I really really want to move on. So ... help!   Anyone got any more

advice beyond what Scott suggested? If so, I'm all ears.



  -- Dwight

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stevea(at)svpal.org
Guest

Posted: Tue May 22, 2007 9:31 am Post subject: Tip-Up Canopy Query

Dwight,



If I understand Scott's suggestion, trimming the canopy frame will 

reduce the flange thickness......the flange the canopy skin rivets to.  

You can probably get away with some trimming, the question is how much 

trimming before running the risk of the frame cracking later.



My canopy frame has the same problem on the right side.  It sits about 

1/32 high (if I remember correctly.......the canopy is off the fuselage 

at the moment).  The left side and center fit flush.  I have seen 

similar conditions to varying degrees on some other tip up canopy RVs.



You could trim the canopy frame, and add a doubler angle on the inside 

of the frame flange.  The doubler angle rivets to the forward facing 

canopy frame web, and the canopy frame flange/canopy skin joint.  The 

trick is to make a doubler angle that fits inside the canopy frame 

channel and follows the skin curvature.  It can be done, but will take a 

bit of work



I would opt for shimming the forward skin rather than trimming the 

canopy frame.  Shimming sounds like the easiest way out of this 

particular swamp (other than doing nothing and living with the 

gap....but I understand how tough that is!) .         



good luck,

Steve

RV-6A - tip up

Dwight Frye wrote:

 	  Quote: 	
		   On the left-hand side (facing forward) it is almost perfect. I have less

 than 1/64th of an inch of gap and am quite happy. On the right-hand side

 (again, facing forward) I'm not so happy. I have about 1/16th of an inch

 of gap and I'd like to close that a bit. 



 A suggestion I got from Scott Risan was to shave down the canopy frame 

 bow along the front such that there is less distance for the skin to

 cover, and thus pulling that problem edge down lower.

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Dan Reeves

Joined: 10 Jan 2006
Posts: 16

Posted: Tue May 22, 2007 11:29 am Post subject: Tip-Up Canopy Query

Dwight,

   

  My frame was also a bit high outboard of the gooseneck's on both sides.  Not only was the canopy skin high in comparison to the front skin but the front end of the side rails also extended a bit beyond the sides of the fuselage.  This of course was after all of the riveting was done.  Everything lined up perfectly and was flush on the sides before riveting.

   

  I ended up wrapping a tie-down strap around the entire front bow of the frame and ratcheted everything into alignment.  The front corners of the frame were pulled downward and inward such that there is no gap in the skins up front and the front of the side rails are now flush with sides of the fuselage.  Worked for me.

   

  Another approach might be to drill out the rivets of the joining plate in the center of the frame and also from the tabs on the sides and replace / redrill  these such that the sides of the frame are pulled inward / downward more.

   

  Good luck,,,shims / filler may be the best way to go for small variances though.  Just thought I'd present some other options.

   

  Dan

  RV-7A wiring



Dwight Frye <dwight(at)openweave.org> wrote:

  [quote]--> RV-List message posted by: Dwight Frye 



I am currently working my way slowly through the canopy frame fitting

exercise. It is going well (after a long delay due to a kitchen remodel

that took 3 months) but I'm not -quite- there, and want advice.



In general the fit along the split between the forward top skin and the

skin on the canopy frame is good. At least the amount of gap is good. As

I move out from the center, past where the 'goose-neck hinges' go,  the

canopy frame skin starts to ride a little high. In the center I have it

shimmed so that it is intentionally a little high, of course, to clear

the forward skin. But along those curves leading down to the side of the

fuselage I need to either lower the canopy frame skin, or shim up the

forward skin. Either works for me.



On the left-hand side (facing forward) it is almost perfect. I have less

than 1/64th of an inch of gap and am quite happy. On the right-hand side

(again, facing forward) I'm not so happy. I have about 1/16th of an inch

of gap and I'd like to close that a bit. 



A suggestion I got from Scott Risan was to shave down the canopy frame 

bow along the front such that there is less distance for the skin to

cover, and thus pulling that problem edge down lower. I have done that

a _tiny_ bit, but before I shaved more off of the frame I thought I'd

solicit any other input from the collected wisdom of the list. If I  Food fight? Enjoy some healthy debate

in the Yahoo! Answers Food & Drink Q&A. [quote][b]

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dwight(at)openweave.org
Guest

Posted: Tue May 22, 2007 12:14 pm Post subject: Tip-Up Canopy Query

Yeah ... Scott also said that it would reduce the flange thickness, but

that it was pretty beefy material and could take some thinning without

harm. I wasn't able to pin him down on a specific amount, though.  At

this point I don't think I'm even close to thinning it too much, but I

am going at it -very- cautiously.

As far as fixing the mis-match on the forward edge of the canopy skin

goes, I agree that shimming is the easy solution. The gap I'm having

trouble figuring out how to close (and it is hard to describe, maybe I

need a picture) is the gap between the fuselage side skin, and the 

right-hand (looking forward) _bottom_ edge of the tip-up canopy skin.

This is the edge that runs from the front bottom corner of the tip-up

canopy skin along the side rails of the fuselage.

I hope to fiddle with this more tonight, but am looking for any insight

folks might have to offer. It may be the case that I'm not the FIRST to

say that they'll glad when they are done with canopy, but I will be. 

Thanks for the input!! 

  -- Dwight

On Tue May 22 13:30:01 2007, Steve A wrote :

 	  Quote: 	

Dwight,

If I understand Scott's suggestion, trimming the canopy frame will 

reduce the flange thickness......the flange the canopy skin rivets to.  

You can probably get away with some trimming, the question is how much 

trimming before running the risk of the frame cracking later.

My canopy frame has the same problem on the right side.  It sits about 

1/32 high (if I remember correctly.......the canopy is off the fuselage 

at the moment).  The left side and center fit flush.  I have seen 

similar conditions to varying degrees on some other tip up canopy RVs.

You could trim the canopy frame, and add a doubler angle on the inside 

of the frame flange.  The doubler angle rivets to the forward facing 

canopy frame web, and the canopy frame flange/canopy skin joint.  The 

trick is to make a doubler angle that fits inside the canopy frame 

channel and follows the skin curvature.  It can be done, but will take a 

bit of work

I would opt for shimming the forward skin rather than trimming the 

canopy frame.  Shimming sounds like the easiest way out of this 

particular swamp (other than doing nothing and living with the 

gap....but I understand how tough that is!) .         

good luck,

Steve

RV-6A - tip up

Dwight Frye wrote:

> On the left-hand side (facing forward) it is almost perfect. I have less

> than 1/64th of an inch of gap and am quite happy. On the right-hand side

> (again, facing forward) I'm not so happy. I have about 1/16th of an inch

> of gap and I'd like to close that a bit. 

>

> A suggestion I got from Scott Risan was to shave down the canopy frame 

> bow along the front such that there is less distance for the skin to

> cover, and thus pulling that problem edge down lower.

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stevea(at)svpal.org
Guest

Posted: Tue May 22, 2007 4:03 pm Post subject: Tip-Up Canopy Query

Ahh, now I understand what edge we're talking about.  How about using an 

edge rolling tool or hand seamer to put a slight bend the the top skin 

that overhangs the canopy frame?



Steve

Dwight Frye wrote:

 	  Quote: 	
		   The gap I'm having

 trouble figuring out how to close (and it is hard to describe, maybe I

 need a picture) is the gap between the fuselage side skin, and the 

 right-hand (looking forward) _bottom_ edge of the tip-up canopy skin.

 This is the edge that runs from the front bottom corner of the tip-up

 canopy skin along the side rails of the fuselage.

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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:

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wgill10(at)comcast.net
Guest

Posted: Tue May 22, 2007 8:06 pm Post subject: Tip-Up Canopy Query

Please post details…price, address, method of payment…and BTW, count me in.  

   

Bill  

   

--

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carlosh(at)sec-engr.com
Guest

Posted: Tue May 22, 2007 8:48 pm Post subject: Tip-Up Canopy Query

William Gill wrote:

[quote]

 Please post details…price, address, method of payment…and BTW, count 

 me in.



 Bill



 --

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Mark Phillips in TN

Joined: 10 Jan 2006
Posts: 431
Location: Columbia, TN

Posted: Tue May 22, 2007 10:46 pm Post subject: Tip-Up Canopy Query

In a message dated 5/22/2007 9:29:46 PM Central Daylight Time, PeterHunt1(at)aol.com writes:

  	  Quote: 	
		  When I installed my gas struts the clearance changed again as the struts push the canopy forward when closed.  	


 Here's a pretty simple way to control this:

  

 http://websites.expercraft.com/n51pw/index.php?q=log_entry&log_id=4983

  

 From The PossumWorks in TN,

 Mark - RV-6A "Mojo" (with bling too!)

 

 http://websites.expercraft.com/n51pw/

  



See what's free at AOL.com. 

  [quote][b]

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_________________
From The PossumWorks...

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