VansAirForceForums  
Home > VansAirForceForums

-POSTING RULES
-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

  #1  
Old 07-16-2008, 08:19 PM
prkaye prkaye is offline
 
Join Date: Jun 2006
Location: Ottawa, Ontario, Canada
Posts: 2,117
Default canopy frame height

I've been playing around with my canopy frame tonight. I just have the rails and back slider resting in place, to see how the fit is. My roll-bar is already bolted in place.

It appears to me that the front of the canopy frame is sitting way too high. As you can see in the photo (below) the top of the canopy frame at the front is about an inch higher than the top of the roll bar.

DWG 43, Detail B indicates "3/8 inch at roll bar/canopy frame top & center".

But page 9-10 of the plans seems to say it has to be even closer "the front top of the frame is about 1/8-3/16" higher than the roll bar" (third last para on page).

The height at the rear looks OK (relative to the top skin back there). The gap along the vertical part of the canopy frame and roll bar widens towards the top.

I'm not sure what to do about the height issue. Have others experienced this?

Photo:
__________________
Phil
RV9A (SB)
Flying since July 2010!
Ottawa, Canada
Reply With Quote
  #2  
Old 07-16-2008, 08:37 PM
robjohnson's Avatar
robjohnson robjohnson is offline
 
Join Date: Jun 2005
Location: IL
Posts: 136
Default

You have to trim the bottom of the canopy frame tubes (the front bow) to get the height right. You don't want to do this until all of the other bending and tweaking has been done. Also, I can't tell from your pictures, but you will want to check the height with the frame actually sitting in the wheel brackets to get the actual height.
__________________
Rob Johnson
Bloomington, IL
RV-7 N826RC - sold
1945 Piper J3 Cub - sold
RV-10 - wings with fuselage ordered
https://www.rv-builder.com
Reply With Quote
  #3  
Old 07-16-2008, 08:46 PM
LifeofReiley's Avatar
LifeofReiley LifeofReiley is offline
 
Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
Default

You can bank on 1/8" trim on the front roller tubes. You have a lot of drill room in the roller shaft, so don't worry about that too much. The fit in the rear is very close. When you get to the side skirts... Van's are not tall enough to do the fit, and you will end up triming the new skirts down. I've got a great cheat on this one.
__________________
Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1

Last edited by LifeofReiley : 07-16-2008 at 08:48 PM.
Reply With Quote
  #4  
Old 07-17-2008, 06:52 AM
prkaye prkaye is offline
 
Join Date: Jun 2006
Location: Ottawa, Ontario, Canada
Posts: 2,117
Default

Ok thanks guys, I was wondering about cutting some off the "legs" on the front bow (where the rollers get attached) to solve this, but am nervous abotu cutting that big expensive thing.

Quote:
You can bank on 1/8" trim on the front roller tubes.
Assuming the top of the canopy frame should be 3/8" higher than the roll bar, I will have to chop about 5/8" off those (currently sittnig about an inch higher). Again, chopping this much off my canopy frame makes me nervous!

I mentioned in my first post an apparent inconsistency in the plans/drawings. One place says the top of the canopy frame should be 3/8" inches higher than the top of the roll bar, and another place seems to say it should be between 1/16" and 1/8". Which is correct? Or have I misinterpreted one of these?
__________________
Phil
RV9A (SB)
Flying since July 2010!
Ottawa, Canada
Reply With Quote
  #5  
Old 07-17-2008, 06:59 AM
LifeofReiley's Avatar
LifeofReiley LifeofReiley is offline
 
Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
Default

Quote:
Originally Posted by prkaye View Post
Ok thanks guys, I was wondering about cutting some off the "legs" on the front bow (where the rollers get attached) to solve this, but am nervous abotu cutting that big expensive thing.


Assuming the top of the canopy frame should be 3/8" higher than the roll bar, I will have to chop about 5/8" off those (currently sittnig about an inch higher). Again, chopping this much off my canopy frame makes me nervous!

I mentioned in my first post an apparent inconsistency in the plans/drawings. One place says the top of the canopy frame should be 3/8" inches higher than the top of the roll bar, and another place seems to say it should be between 1/16" and 1/8". Which is correct? Or have I misinterpreted one of these?
For some reason changes happen quick with this canopy thing. My first cut was 3/8", then 1/8" on the right side only to level me up. My suggestion was 1/8" goes a long way so take it slow.
__________________
Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
Reply With Quote
  #6  
Old 07-18-2008, 03:42 PM
ninerhawk ninerhawk is offline
 
Join Date: Aug 2005
Posts: 27
Default Roll bar canopy height difference

I understand the need to "sneak up" on cutting the tubes for the rollers to achieve the correct height. But I am also still confused about the discrepancies in the plans drawings/instructions. What difference in height should we end up with - 3/8" per DWG 43, or pg 9-10, and also supplementary instructions, stating 1/8-3/16" difference in height?

Guess I'm still concerned with the same question prkaye started the thread with.
__________________
Howard Kaney
RV-9A
West Bend, WI
fuselage/FF
Reply With Quote
  #7  
Old 07-20-2008, 01:15 PM
prkaye prkaye is offline
 
Join Date: Jun 2006
Location: Ottawa, Ontario, Canada
Posts: 2,117
Default final trimming

maybe i can answer the question now... I think 3/8 is a good starting point, but that the final height is determined once you get the plexi on there and are tweaking things to get thigns perfect when you close it. It looks to me like this is one of those `whatever makes it work' things, and the 1/16 or 3/8 are just ballpark figures. Standard deviation for this measurement is probably pretty big between different builders' fuselages.
__________________
Phil
RV9A (SB)
Flying since July 2010!
Ottawa, Canada
Reply With Quote
  #8  
Old 07-20-2008, 03:29 PM
Dave Cole's Avatar
Dave Cole Dave Cole is offline
 
Join Date: Jan 2005
Location: Roanoke, VA
Posts: 306
Default Slider height must match windscreen

You want to set the height of the slider frame so that the slider canopy will match the windscreen at the rollbar. Save the height adjustment until after the canpoy is drilled and clecoed to the slider frame. At that point you can hold the windscreen in place on the rollbar and adjust the slider to match it.
__________________
Dave Cole RV-7 N97DC reserved
dave.cole@cox.net
Started SB April 2004
Hope to fly in 2011
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 03:24 PM.


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.