VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics


Go Back   VAF Forums > Model Specific > RV-9/9A
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 05-31-2007, 12:33 PM
alpinelakespilot2000 alpinelakespilot2000 is offline
 
Join Date: Jan 2005
Posts: 3,374
Default RV-7 / RV-9 slider canopy measurement discrepancies

After a few weeks of frustrating contemplation and a couple days of sometimes frustrating bending, my canopy frame is getting pretty close. However, I cannot reconcile two discrepencies with the plans. Any help would be appreciated...

1. Height of forward canopy bow vis-a-vis roll bar: One of the canopy drawings clearly indicates that the forward canopy bow should be 3/8" above the top of the roll bar. However, in the "additional notes on adjusting the canopy frame" section of my manual, it states that "The front top of the frame is about 1/8 - 3/16" higher than the rollbar." So which is it?

2. Distance between the slider tracks: The manual indicates that the slider tracks should be positioned such that the canopy frame side bows are inset 1/16" from the outside of the fuselage. "This should position the tracks approximately 40 13/16" apart when measuring between roller track inboard vertical surfaces." Problem... when my canopy bows are inset 1/16" from the outside of the fuselage, the distance I'm seeing is about 41 3/16 (or about 5/16" difference from Van's!). I know there is variation from one builder to another, but Van's measurement doesn't even seem close.

Thanks for any help!
__________________
Steve M.
Ellensburg WA
RV-9 Flying, 0-320, Catto

Donation reminder: Jan. 2018
Reply With Quote
  #2  
Old 05-31-2007, 02:17 PM
ge9a ge9a is offline
 
Join Date: Jan 2005
Posts: 165
Default

Good timing on this thread! I'll be interested in the comments here. I'm just about to this point.
__________________
Greg English
Beaverton, OR
RV-9A QB
Reply With Quote
  #3  
Old 05-31-2007, 02:59 PM
pierre smith's Avatar
pierre smith pierre smith is online now
 
Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,796
Default I measured mine

Hi Steve and Greg,
My -6A rails have about 1/16" inset from the INNER edge of the fuselage top longeron and they measure 40 5/8" apart at the inner vertical surfaces. In other words, a little bit of the top longeron shows....about a 1/16" and it's not critical. Just about every one you'll see is somehow different.

Keep in mind the overall picture...that the rails have to be parallel and the side skins will have to have a little clearance later on. If you can temporarily tape down the rails, mount the canopy frame with rollers and then position the canopy on top of the whole shebang (after drilling the hole for the handle), I think the picture will more easily develop. The windshield has to be shimmed to align it's trailing edge with the leading edge of the slider canopy later on.

If you get inside the cockpit and have a couple of buddies lower the canopy on, you can measure the gaps between the roll bar and canopy and also see what needs to be done....whether the slider front legs have to be raised or lowered, etc. Since the height of the rollbar is fixed, the adjusting is done on the canopy frame front vertical legs.

BTW, take some of Van's dimensions with a grain of salt and just fit it all up and take a good look.

Hope this helps somewhat,
Pierre
__________________
Pierre Smith
RV-10, 510 TT
RV6A (Sojourner) 180 HP, Catto 3 Bl (502Hrs), gone...and already missed
Air Tractor AT 502B PT 6-15
Air Tractor 402 PT-6-20
EAA Flight Advisor/CFI/Tech Counselor
Louisville, Ga

It's never skill or craftsmanship that completes airplanes, it's the will to do so,
Patrick Kenny, EAA 275132


Dues gladly paid!
Reply With Quote
  #4  
Old 05-31-2007, 03:43 PM
alpinelakespilot2000 alpinelakespilot2000 is offline
 
Join Date: Jan 2005
Posts: 3,374
Default

Quote:
Originally Posted by pierre smith
My -6A rails have about 1/16" inset from the INNER edge of the fuselage top longeron and they measure 40 5/8" apart at the inner vertical surfaces. In other words, a little bit of the top longeron shows....about a 1/16" and it's not critical. Just about every one you'll see is somehow different.
Thanks Pierre! Follow up: By "1/16" inset from the inner edge of the fuselage top longeron," do you mean from the inner edge of the aft canopy deck? (On the 7/9 there is a deck over the longeron, so you can't see the inboard edge of the longeron.) I have about 3/32" inset from the inboard edges of the canopy deck, which is what the scale of the drawings suggests I should probably have... but there are no dimensional callouts.

Still not sure why I'm measuring 41 3/16" although I think the 7/9 is wider than the 6, so that would explain why my measurement seems to be larger than yours. In fact,I wouldn't be surprised if Van's just indiscriminately copied the 6 manual for the 7/9... don't think it would be the first time. I'll try to call Van's later on and ask them this question.

Thanks again.
__________________
Steve M.
Ellensburg WA
RV-9 Flying, 0-320, Catto

Donation reminder: Jan. 2018

Last edited by alpinelakespilot2000 : 05-31-2007 at 03:45 PM.
Reply With Quote
  #5  
Old 05-31-2007, 04:26 PM
pierre smith's Avatar
pierre smith pierre smith is online now
 
Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,796
Default Yep

You're correct,
There is a canopy deck on mine too....I just looked. That's what I was talking about....mine is also around 3/32" inset there. I checked Van's specs a minute ago and the -6 and -7 share the same inside width dimensions on Van's website.

Is there a -6 or -7 near you that you can go and look at? Sure makes things plain if you could.

Regards,
Pierre
__________________
Pierre Smith
RV-10, 510 TT
RV6A (Sojourner) 180 HP, Catto 3 Bl (502Hrs), gone...and already missed
Air Tractor AT 502B PT 6-15
Air Tractor 402 PT-6-20
EAA Flight Advisor/CFI/Tech Counselor
Louisville, Ga

It's never skill or craftsmanship that completes airplanes, it's the will to do so,
Patrick Kenny, EAA 275132


Dues gladly paid!
Reply With Quote
  #6  
Old 05-31-2007, 08:08 PM
Mark Burns's Avatar
Mark Burns Mark Burns is offline
 
Join Date: Jan 2005
Location: Ruston, Louisiana
Posts: 851
Default Canopy rail measurement

Quote:
Originally Posted by

[B
2. Distance between the slider tracks:[/b] The manual indicates that the slider tracks should be positioned such that the canopy frame side bows are inset 1/16" from the outside of the fuselage. "This should position the tracks approximately 40 13/16" apart when measuring between roller track inboard vertical surfaces." Problem... when my canopy bows are inset 1/16" from the outside of the fuselage, the distance I'm seeing is about 41 3/16 (or about 5/16" difference from Van's!). I know there is variation from one builder to another, but Van's measurement doesn't even seem close.

Thanks for any help!
Data point:
Just measured my 7A slider tracks and they are 41-1/16" apart.
I remember this discrepancy with the drawing. I finally just assumed the drawing was wrong. The sliding part of my canopy is finished and everything looks and works good.

Mark
__________________
Mark Burns
Ruston, Louisiana
RV-7A N781CM 1,450+ hrs
FFI FL-24
Reply With Quote
  #7  
Old 06-01-2007, 12:26 AM
alpinelakespilot2000 alpinelakespilot2000 is offline
 
Join Date: Jan 2005
Posts: 3,374
Default

Quote:
Originally Posted by Mark Burns
Data point:
Just measured my 7A slider tracks and they are 41-1/16" apart.
I remember this discrepancy with the drawing. I finally just assumed the drawing was wrong. The sliding part of my canopy is finished and everything looks and works good.

Mark
Thanks Mark. I called Van's later today and Bruce said the "approximate 40-13/16" is pretty irrelevant so long as the rails are parallel and the 1/16" distance from the side tubes to side skins is maintained. Except for noting that the vertical distance from forward bow to roll bar did need to be the 3/8" noted on the drawings, he said pretty much every other dimension given on the plans was just an approximate. If everything fits and your canopy rolls back, you did it right he said, regardless of what the numbers are.

In any case, thanks for measuring yours. Actually now that I've tweaked my frame just a little more, mine is measuring at about 41-2/16", so you and I are really close!
__________________
Steve M.
Ellensburg WA
RV-9 Flying, 0-320, Catto

Donation reminder: Jan. 2018
Reply With Quote
  #8  
Old 06-01-2007, 06:44 AM
cleve_thompson's Avatar
cleve_thompson cleve_thompson is offline
 
Join Date: Feb 2006
Location: Waycross GA
Posts: 185
Default

The timing of this thread is great! I also am having a time interpreting the instructions for fitting the canopy frame/rail on a RV9A. I have tweaked and tweaked and now have the rear canopy frame bow matching the rear turtle deck skin. I have a 1/16th clearance between the canopy frame side rails and the skin fore and aft before I put the canopy on the frame. This is according to the manual. The manual instructions say that the canopy frame will be spread with the addition of the canopy and that this will be compensated for "later". However, I can't find the "later". In the FAQ section on Van's Aircraft, it talks about substracting a half inch from the measurements to compensate for this spread but this is not confirmed in the manual.
What do I do?
Thanks
__________________
Cleve Thompson
Waycross, GA
Flying a RV9A with O-320 from KAYS
since Dec 2007 & having a blast
Reply With Quote
  #9  
Old 06-01-2007, 08:10 AM
Steve Steve is offline
 
Join Date: Jan 2005
Location: Roy, Utah
Posts: 1,063
Default

I'm also at that point. A couple of notes:

1. The instructions say the plexi will cause the frame to spread approx 1/2". It was closer to a whole inch on my plane. After getting the 1/16" inset dimension, the OUTSIDE distance between the ends of the front bow was 42 1/2" so I needed to narrow the front bow to 41 1/2" before attaching the plexi.

2. The distance between my tracks is 3/8" wider than the figure in the instructions, measured after tweaking the frame for the 1/16" inset.

3. The 30 inch length dimension on the C-759 is shown in parenthesis on the print as if its already there. You'll need to shorten them approx 1 1/2" to get the 30 inch length.

If I had my ECI engine I could rivet the front skin then fit the windshield,
Steve
Reply With Quote
  #10  
Old 09-04-2017, 03:55 PM
joew joew is offline
 
Join Date: Nov 2008
Location: Litchfield, Ohio
Posts: 67
Default Canopy side rails

I know these are older posts, but I'm there now. I'm seeing the distance of 41 1/4. My question is the aft screw hole on the side rail is hitting the edge of the longeron. My other screw holes are all fine. Is this a problem? I have the 1/16th edge distance (mostly) on the canopy frame.

The plans show the screw no where near the longeron. Considering how the plans weren't very reliable, what have you guys seen
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 06:35 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.