|
-
POSTING RULES

-
Donate yearly (please).
-
Advertise in here!
-
Today's Posts
|
Insert Pics
|

06-10-2016, 03:31 PM
|
|
|
|
Join Date: Jun 2010
Location: Sunman, IN
Posts: 2,189
|
|
Updated SB for Aileron Brackets
For those who were interested in what Van's had to say about using Cherry Max rivets to complete this Service Bulletin, they have updated the SB to allow them.
Refer to page 11 of the bulletin for the revision...
__________________
Bob
Aerospace Engineer '88
RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
EFII System 32 - Done
297 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful
Wiring...
Dues+ Paid 2019,...Thanks DR+
|

06-11-2016, 12:37 PM
|
|
|
|
Join Date: Mar 2014
Location: Bratislava, Slovakia
Posts: 203
|
|
Quote:
Originally Posted by rocketman1988
For those who were interested in what Van's had to say about using Cherry Max rivets to complete this Service Bulletin, they have updated the SB to allow them.
Refer to page 11 of the bulletin for the revision...
|
Thanks for the update!
__________________
Igor
RV-10 in progress
Build Log
|

06-11-2016, 11:50 PM
|
 |
|
|
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
|
|
Anyone that chooses to use Cherry rivets for some or all of the rivet locations should use caution.
The are strong rivets, but they are much less forgiving than solid AN470 rivets regarding installation errors. Hole condition is critical. If holes are enlarged at all, or out of square, oversize rivets should be used to allow for correcting the hole problem.
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
|

06-12-2016, 07:14 AM
|
|
|
|
Join Date: May 2008
Location: Martinsville, IN
Posts: 454
|
|
Square holes?
What kind of bit do I use for square holes?
Sorry, couldn't resist!
Don
|

06-12-2016, 11:48 AM
|
|
|
|
Join Date: Aug 2008
Location: Leesburg, va
Posts: 213
|
|
$5 endoscope from eBay
So my $5 endoscope from eBay showed up today. It does not focus very fast and the software for my droid would not take photos, but I could easily see all the rivets for the SB without any modifications. Best $5 I have spent on a tool for the plane. Plan on trying it out on the cylinders next.
John
|

06-13-2016, 07:20 AM
|
|
|
|
Join Date: Dec 2008
Location: Albany, Western Australia
Posts: 13
|
|
Would be nice if Vans engineering staff approved the use of No 8 structural screws in place of rivets now they have allowed the use of "mixed hardware" ie Cherrymax rivets. Much less chance of a stuff up trying to rivet inside the wing.
Especially if only replacing a smoking rivet in an awkward spot.
|

06-13-2016, 08:17 AM
|
 |
|
|
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
|
|
Quote:
Originally Posted by RV6JOY
Would be nice if Vans engineering staff approved the use of No 8 structural screws in place of rivets now they have allowed the use of "mixed hardware" ie Cherrymax rivets. Much less chance of a stuff up trying to rivet inside the wing.
Especially if only replacing a smoking rivet in an awkward spot.
|
This is not quite as simple of a change as you might think.
Standard rivets swell in diameter when they are installed.
Cherry rivets (Correctly sized and installed) swell very slightly when installed.
This produces a post installation tight fit .
#8 structural screws do not swell when installed. That would makes the hole fit for a screw the most critical.
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
|

06-13-2016, 04:33 PM
|
|
|
|
Join Date: Dec 2008
Location: Albany, Western Australia
Posts: 13
|
|
Thanks for replying Scott. In the case of the aileron brackets, I would suggest that the load on the fasteners is almost entirely in tension which No 8 structural screws would do much better than AN4 rivets.
In the wings with smoking rivets it is only the top and bottom rivets that are smoking which suggests they are not up to the loads involved.
The chap who built this plane was no bunny when it came to driving rivets having built at least 13 complete RVs and parts of a lot more.
|

06-14-2016, 10:54 AM
|
 |
|
|
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
|
|
Quote:
Originally Posted by RV6JOY
In the wings with smoking rivets it is only the top and bottom rivets that are smoking which suggests they are not up to the loads involved.
The chap who built this plane was no bunny when it came to driving rivets having built at least 13 complete RVs and parts of a lot more.
|
The S.B didn't address smoking rivets because there is no evidence of that issue.
If you know of someone that discovered that, it is a very isolated instance based on the information I have.
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
|

07-10-2016, 08:32 AM
|
|
|
|
Join Date: Aug 2015
Location: Hurricane Utah
Posts: 156
|
|
use of #8 structural screws...
I went to Vans and made that inquiry/case for #8 structural screws and got the traditional "anything outside the SB recommendations is at the builder/owners risk." I respect they need to be cautious in today's world. So, glad to hear Vans is expanding the fastener list, but like some have said, Cherrymax do not fill bad holes well at all and can "look good" at first. I have seen repairs in high load areas in certified aircraft with Cherrymax structural rivets loosen over time. Absolute double pain in the ... to replace and the hole gets bigger..... Some of this I suspect was a bad hole at the start, you know, those square ones!  They can look great just after install, however, I think for areas of vibration and high/changing loads, like aileron brackets, they can fail over time if not done really really well. If I do make the mod (just recently closed up wings, darn!), it will be with #8 structural screws. Puts and takes the load where it needs to be, I will live with the extra couple of ounces.
|
| Thread Tools |
Search this Thread |
|
|
|
| Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -6. The time now is 12:47 AM.
|