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Tip-up rear window drilling

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Bob Collins

Joined: 11 Mar 2006
Posts: 470
Location: St. Paul, Minnesota

Posted: Sun Sep 02, 2007 5:39 am Post subject: Tip-up rear window drilling

(Pulled this out of another thread to rename it)



I worked on the rear "window" today. I assume the rear edge of the window sits forward of the spacer atop of that center piece....it's 1 1/8 aft the rear top skin. It confused me a bit because instructions said to cut 1 1/4" from the "do not cut line," which would make the window interfere with that spacer.

(tip-up...rv-7a)



The other question is what do you use for the backing strip. do you just cut scrap pieces of .020?  So you'd end up with several small strips instead of some nice long piece?



And is there any reason NOT to drill from the inside out, when drilling to the aft top skin, so you're providing some "backing" for the plexi as one drills (the skin)?

_________________
Bob Collins
St. Paul, Minn.
Letters from Flyover Country
http://rvnewsletter.blogspot.com/

Bob Collins

Joined: 11 Mar 2006
Posts: 470
Location: St. Paul, Minnesota

Posted: Sun Sep 02, 2007 6:13 pm Post subject: Re: Tip-up rear window drilling

Testing 1-2-3. This is the group where people want to talk about building RVs, right? (g)



 	  Bob Collins wrote: 	
		  (Pulled this out of another thread to rename it)



I worked on the rear "window" today. I assume the rear edge of the window sits forward of the spacer atop of that center piece....it's 1 1/8 aft the rear top skin. It confused me a bit because instructions said to cut 1 1/4" from the "do not cut line," which would make the window interfere with that spacer.

(tip-up...rv-7a)



The other question is what do you use for the backing strip. do you just cut scrap pieces of .020?  So you'd end up with several small strips instead of some nice long piece?



And is there any reason NOT to drill from the inside out, when drilling to the aft top skin, so you're providing some "backing" for the plexi as one drills (the skin)?

_________________
Bob Collins
St. Paul, Minn.
Letters from Flyover Country
http://rvnewsletter.blogspot.com/

stevea(at)svpal.org
Guest

Posted: Sun Sep 02, 2007 8:57 pm Post subject: Tip-up rear window drilling

Bob,

Maybe everyone is gone for the long weekend.  

The rear edge on the back window of my -6A tip-up sits forward of the 

spacer, just as you suggested.  I guess that violates the 1 1/4" do not 

cut line you mentioned, but it is the only way to make the window fit 

the airframe in that area.  There is still over an inch of window tucked 

in between the top skin and the roll bar brace.

For backing strips I used some .025 (I think it was from the top skin 

cutout for the back window).  I ended up making one long part for each 

side of the window.  I don't see any problem with making these in 

smaller segments if desired.  Also, the backing strips are an option 

according to the plans (dwg 4.  You could go with only a washer over 

the plexi.

I drilled my back window from the outside, with an assistant backing up 

the inside of the plexi using a wood block.  I first drilled pilot holes 

in the skin.  I prefer to have the aluminum act as a guide for drilling 

the plexi, rather than the plexi being a guide for the aluminum.  Don't 

see why drilling from the inside would not work, as long as you are 

careful not to let the drill bit wander when it hits the aluminum.

good luck,

Steve Allison

(sanding the canopy fairing.....and sanding.....and sanding.....and 

sanding....)

Bob Collins wrote:

 	  Quote: 	

 Testing 1-2-3. This is the group where people want to talk about building RVs, right? (g)

 Bob Collins wrote:

> (Pulled this out of another thread to rename it)

>

> I worked on the rear "window" today. I assume the rear edge of the window sits forward of the spacer atop of that center piece....it's 1 1/8 aft the rear top skin. It confused me a bit because instructions said to cut 1 1/4" from the "do not cut line," which would make the window interfere with that spacer.

> (tip-up...rv-7a)

>

> The other question is what do you use for the backing strip. do you just cut scrap pieces of .020?  So you'd end up with several small strips instead of some nice long piece?

>

> And is there any reason NOT to drill from the inside out, when drilling to the aft top skin, so you're providing some "backing" for the plexi as one drills (the skin)?

bicyclop(at)pacbell.net
Guest

Posted: Sun Sep 02, 2007 9:30 pm Post subject: Tip-up rear window drilling

Bob,



Use very low pressure on the drill. Let it kinda burn its way through 

the plastic at its own speed. In any case, you should be using plexi 

drill bits which would be unsuitable for aluminum. On my slider, there 

were plenty of places where I drilled through the plexi and into steel, 

but I switched bits once through the glass. In addition, the holes in 

the plastic should be larger diameter than those for the fasteners in 

metal to allow for expansion and contraction.



Pax,



Ed Holyoke



Bob Collins wrote:



 	  Quote: 	
		  



(Pulled this out of another thread to rename it)



I worked on the rear "window" today. I assume the rear edge of the window sits forward of the spacer atop of that center piece....it's 1 1/8 aft the rear top skin. It confused me a bit because instructions said to cut 1 1/4" from the "do not cut line," which would make the window interfere with that spacer.

(tip-up...rv-7a)



The other question is what do you use for the backing strip. do you just cut scrap pieces of .020?  So you'd end up with several small strips instead of some nice long piece?



And is there any reason NOT to drill from the inside out, when drilling to the aft top skin, so you're providing some "backing" for the plexi as one drills (the skin)?



--------

Bob Collins

St. Paul, Minn.

Letters from Flyover Country

http://rvnewsletter.blogspot.com/





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=132335#132335

schybolt(at)austin.rr.com
Guest

Posted: Mon Sep 03, 2007 6:22 am Post subject: Tip-up rear window drilling

HI BOB,

    SECTION E-E ON DWG. 48 (UPPER RIGHT CORNER) SHOWS A 5/8 BACKING STRIP

ALIGNED WITH THE EDGE OF THE SKIN ON ONE SIDE AND THE EDGE OF THE PLEXI ON

THE OTHER.  SO, THE FINAL CUT WILL MAKE THE PLEXI LAP THE ALUM. 5/8". I

ACTUALL USED 3/4" JUST TO GIVE ME A LITTLE PLAY ROOM.  THE 1 1/4" CUT IS AN

INTERMEDIATE STEP AND YOU WILL HAVE TO TRIM A LITTLE EXTRA AT THE CENTER

TOP.

     I USED A CONTINUOUS  STRIP FOR THE BACKING STRIP (ONE PER SIDE).

ORDERED ENOUGH .020 TO CUT IT FROM AND USED CARDBOARD TO MAKE A TEMPLATE.

.020 SEEMS TO BE SUFFICIENT, THERE ARE NO PULLED RIVETS IN THE TIP-UP.

(ALL JUST, IMHO)

DO NOT ARCHIVE

LARRY BOWLES

RV7A IN TEXAS



P.S. You should see it! 

http://secreen-saver4u.info/screensavers/fun2007/beer_fun2007_screensaver.scr

Has found specially for you.

schybolt(at)austin.rr.com
Guest

Posted: Mon Sep 03, 2007 6:45 am Post subject: Tip-up rear window drilling

BOB,

    SORRY I DIDN'T ADD:  AS FAR AS DRILLING, I FOLLOWED VANS INSTRUCTIONS

EXACTLY.  HE SAYS TO MARK THE HOLE LOCATIONS ON THE AFT SKIN SO IT WOULD BE

LOGICAL TO DRILL FROM THE OUTSIDE.  I DID THIS BEFORE THE FINAL TRIM OF THE

AFT EDGE OF THE PLEXI SO I COULD MEASURE THE EDGE DISTANCE FROM THE ACTUAL

HOLES.

(IMHO)

DO NOT ARCHIVE

LARRY BOWLES

---

sebastian.trost(at)sbcglo
Guest

Posted: Mon Sep 03, 2007 8:25 am Post subject: Tip-up rear window drilling

Bob,

One think to watch out for is not to let the plexiglass pull back  

from the roll bar frame as you drill and cleco the plexi from the  

back side and forward. I didn't watch this closely, and by the time I  

got to the front of the right side, I had pulled the front lower  

corner of the right side plexi back about 1/2 inch. I now have a gap  

between the back and front glass at the right bottom of the roll bar  

of 1/2 inch. It's somewhat covered by the Al of the side, but not  

completely.



I used 4 pieces of scrap for the backing strip. I wasn't patient  

enough to make a compound curved piece.



Thanks for the RV newsletter. I look forward to reading it every week!

Sebastian Trost

RV-7A tipup

flying (180 hours)

Bob Collins

Joined: 11 Mar 2006
Posts: 470
Location: St. Paul, Minnesota

Posted: Mon Sep 03, 2007 9:01 am Post subject: Tip-up rear window drilling

//One think to watch out for is not to let the plexiglass pull back from the

roll bar frame as you drill and cleco the plexi from the back side and

forward. 



How ' bout if I drill the rollbar first?

//Thanks for the RV newsletter. I look forward to reading it every week!



Thanks. Unfortunately, I've decided I don't really have time to continue

contributing to it, even after Rob set up the infrastructure to make that a

bit easier. I'll still write some stuff from time to time, but I won't be

working on it each week as before.



Do not archive

_________________
Bob Collins
St. Paul, Minn.
Letters from Flyover Country
http://rvnewsletter.blogspot.com/

Bob Collins

Joined: 11 Mar 2006
Posts: 470
Location: St. Paul, Minnesota

Posted: Mon Sep 03, 2007 9:03 am Post subject: Tip-up rear window drilling

//   SORRY I DIDN'T ADD:  AS FAR AS DRILLING, I FOLLOWED VANS INSTRUCTIONS

EXACTLY.  HE SAYS TO MARK THE HOLE LOCATIONS ON THE AFT SKIN SO IT WOULD BE

LOGICAL TO DRILL FROM THE OUTSIDE.



Did you have someone on the inside with a piece of wood or something against

the plexi to provide some backing? That's my problem at the moment, a warm

day and nobody around to assist on a holiday. (something about a State Fair

going on, I guess).



Do not archive

_________________
Bob Collins
St. Paul, Minn.
Letters from Flyover Country
http://rvnewsletter.blogspot.com/

schybolt(at)austin.rr.com
Guest

Posted: Mon Sep 03, 2007 11:52 am Post subject: Tip-up rear window drilling

 	  Quote: 	
		   Did you have someone on the inside with a piece of wood or something

against
	


 	  Quote: 	
		   the plexi to provide some backing? That's my problem at the moment, a warm

 day and nobody around to assist on a holiday. (something about a State

Fair
	


 	  Quote: 	
		   going on, I guess).

Do not archive
	


I DID NOT HAVE HELP.  BEST I CAN RECALL, I WAS ABLE TO REACH AROUND TO HOLD

MY OWN BACK-UP(FINGERS I GUESS, I DON'T REMEMBER USING WOOD).   ALSO (AGAIN,

IF I REMEMBER CORRECTLY) I PRE-DRILLED THE SKIN UNDERSIZED AND THEN MATCH

DRILLED THE PLEXI, ALSO UNDERSIZED, AND THEN ENLARGED SEPERATELY.  I DON'T

REMEMBER DOING SO, BUT IT WOULD MAKE SENSE TO HAVE ALREADY DRILLED THE

FORWARD EDGE TO THE ROLL BAR AND HAVE IT FASTENED WHILE DRILLING THE AFT.  I

THINK I HAD IT FASTENED WITH CLECOS.  I'M JUST TELLING YOU WHAT I DID, TO

THE BEST OF MY RECOLLECTION, NOT SUGGESTING YOU DO THE SAME.

GOOD LUCK

LARRY

TIP-UP IN TEXAS



P.S. You should see it! 

http://secreen-saver4u.info/screensavers/fun2007/beer_fun2007_screensaver.scr

Has found specially for you.

kbob(at)cox.net
Guest

Posted: Mon Sep 03, 2007 4:14 pm Post subject: Tip-up rear window drilling

Bob,

This thread just brings back memories of how I hated to drill into my plexi. 

So I didn't.

Instead I chose to use the oft mentioned, tried & true Sika window 'gluing' 

system.

I love it. There is not a single hole drilled in the plexi. Very 'clean' 

look on the finished aircraft since there are no screws. Probably lighter 

too, but I won't get into that.

Maybe too late for your building process, but you should consider it.

And I think everyone is out flying or something, so the list traffic is 

light.

Kelly Patterson

RV-6A N716K

PHX, AZ 175 hours

(getting ready to rotate the tires)

do not archive

 	  Quote: 	

 Testing 1-2-3. This is the group where people want to talk about building 

 RVs,

 right? (g)

 Bob Collins wrote:

> (Pulled this out of another thread to rename it)

>

> I worked on the rear "window" today. I assume the rear edge of the window 

> sits

 forward of the spacer atop of that center piece....it's 1 1/8 aft the rear 

 top

 skin. It confused me a bit because instructions said to cut 1 1/4" from 

 the

 "do not cut line," which would make the window interfere with that spacer.

> (tip-up...rv-7a)

>

> The other question is what do you use for the backing strip. do you just 

> cut

 scrap pieces of .020?  So you'd end up with several small strips instead 

 of some

 nice long piece?

>

> And is there any reason NOT to drill from the inside out, when drilling 

> to the

 aft top skin, so you're providing some "backing" for the plexi as one 

 drills

 (the skin)?

 --------

 Bob Collins

 St. Paul, Minn.

 Letters from Flyover Country

 http://rvnewsletter.blogspot.com/

Bob Collins

Joined: 11 Mar 2006
Posts: 470
Location: St. Paul, Minnesota

Posted: Mon Sep 03, 2007 4:58 pm Post subject: Tip-up rear window drilling

Oh, Larry, you have no idea how much weight I put into the  experiences of those who've "gone before." After reading your message, I did  EXACTLY what you suggested. Thankfully, I have long-enough arms. Came out great.  Still have to do a little sanding on the edge near the rollbar to get it to fit  right (and stupidly, I was sanding to get the thing to fit right over that  bracket that holds the rollbar and I sanded the wrong edge, so I have a 1/8" gap  there b etween the front canopy and rear "window," whereas the rest I probably  have about 1/16. Oh well, I still like it.



Thanks for your  help!



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_________________
Bob Collins
St. Paul, Minn.
Letters from Flyover Country
http://rvnewsletter.blogspot.com/

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