|
-
POSTING RULES

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

11-02-2016, 06:30 PM
|
 |
|
|
Join Date: Jan 2007
Location: Battleground
Posts: 4,348
|
|
Quote:
Originally Posted by vic syracuse
And I hear you on "they haven't moved so I leave them," but I don't think that is the right approach. My opinion. 
Vic
|
Your right Vic. Not just an opinion. Good practice is just that.
Again, thanks for posting all the safety items you discover in the many RV's you inspect.
__________________
Smart People do Stupid things all the time. I know, I've seen me do'em.
RV6 - Builder/Flying
Bucker Jungmann
Fiat G.46 -(restoration in progress, if I have enough life left in me)
RV1 - Proud Pilot.
|

11-02-2016, 11:41 PM
|
|
|
|
Join Date: Mar 2014
Location: Laguna Hills, CA
Posts: 1,805
|
|
Quote:
Originally Posted by az_gila
I dumped all of my kit hardware in trays and just picked what fit, using the plans to specify the type of hardware. Putting the wrong hardware in without checking the plans is a big boo-boo. 
|
I did the same, and if I couldn't find the hardware specified on the plans, I put in a quick order to ACS. The rear spar/fuselage junction is supposed to allow for a small amount of rotation...so don't torque it down!
__________________
Doug
RV-9A "slider"
Flew to Osh in 2017, 2018 & 2019! 
Tail number N427DK
Donation made for 2020
You haven't seen a tree until you've seen its shadow from the sky -- Amelia Earhart
|

11-03-2016, 06:36 AM
|
 |
|
|
Join Date: Aug 2006
Location: Crestwood, KY
Posts: 848
|
|
Quote:
Originally Posted by az_gila
Why would he question it? The bolt is in "standard orientation" with the head forward.
|
Gil,
That's just it - on the 9/9A plans for DWG 38 Section G-G the bolt head is aft - this may be due to flap clearance. I can't find a revision on Van's site telling me the orientation should be otherwise.
__________________
Mike
RV-9A Based K6I2
Flying - out of Phase 1
Building RV-12 with brother
|

11-03-2016, 07:19 AM
|
|
|
|
Join Date: Jun 2005
Posts: 846
|
|
Bolts
Getting ready to change mine on my RV6.
Should they be torqued to proper numbers or snug the plans show the correct way to install bolt?Im pretty sure from the torq seal I have in place there is no movement going on .
Bob
|

11-03-2016, 08:00 AM
|
 |
|
|
Join Date: Jan 2007
Location: Battleground
Posts: 4,348
|
|
Quote:
Originally Posted by 6 Gun
Getting ready to change mine on my RV6.
Should they be torqued to proper numbers or snug the plans show the correct way to install bolt?Im pretty sure from the torq seal I have in place there is no movement going on .
Bob
|
Yes. However, with any castellated nut, you have to get lucky that you can get the cotter key in at a precise torque value. You can experiment with combinations of standard and -L washers. Get it close.
I don't know what the plans show, but on the 6 you can easily put the bolt in the proper orientation.
I don't think there is much if any movement at this joint, but per plans is the proper way to do this and kind of a standard for rear spar connections in other airplanes I have seen. Van was an excellent engineer and he would have done it the way he deemed best regardless.
__________________
Smart People do Stupid things all the time. I know, I've seen me do'em.
RV6 - Builder/Flying
Bucker Jungmann
Fiat G.46 -(restoration in progress, if I have enough life left in me)
RV1 - Proud Pilot.
|

11-03-2016, 09:22 AM
|
 |
|
|
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
|
|
Quote:
Originally Posted by Fearless
Gil,
That's just it - on the 9/9A plans for DWG 38 Section G-G the bolt head is aft - this may be due to flap clearance. I can't find a revision on Van's site telling me the orientation should be otherwise.
|
In AC43.13 where "standard" fastener orientation is addressed, it also adds "unless specified otherwise by the manufacturer". There are numerous instances in RV's where a deviation from the standard is recommended.
Having said that, in this particular case I am not sure why the bolts are specified to be reversed because there would be no interference if the nut was on the aft side. It is possible that it is because of a late design change in the flap leading edge but I don't recall one. So in the case of the RV-9 it would be acceptable to install the bolt in the normal orientation.
Regarding movement of this joint and people seeing no evidence of it.......
It all depends on the loads the wing has experienced!
I assure you that if the wings are loaded to limit load values, there is significant flex/deflection in the wings (witnessed during many different static load tests) which translates to some amount of movement at the aft spar attach point.
__________________
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 ")
|

11-03-2016, 09:56 AM
|
 |
|
|
Join Date: Jan 2007
Location: Battleground
Posts: 4,348
|
|
Quote:
Originally Posted by rvbuilder2002
Regarding movement of this joint and people seeing no evidence of it.......
It all depends on the loads the wing has experienced!
I assure you that if the wings are loaded to limit load values, there is significant flex/deflection in the wings (witnessed during many different static load tests) which translates to some amount of movement at the aft spar attach point.
|
Very good point Scott.
This also leads into checking the screws of the overlap of the fuselage bottom skin to the wing. I have found these need to be tightened up a bit over time. I think many do not think to check them.
__________________
Smart People do Stupid things all the time. I know, I've seen me do'em.
RV6 - Builder/Flying
Bucker Jungmann
Fiat G.46 -(restoration in progress, if I have enough life left in me)
RV1 - Proud Pilot.
Last edited by JonJay : 11-03-2016 at 10:00 AM.
|

11-03-2016, 10:20 AM
|
 |
|
|
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
|
|
Torque it up a bit more...
Quote:
Originally Posted by JonJay
Yes. However, with any castellated nut, you have to get lucky that you can get the cotter key in at a precise torque value. You can experiment with combinations of standard and -L washers. Get it close.
I don't know what the plans show, but on the 6 you can easily put the bolt in the proper orientation.
......
|
AC43.13 allows quite a spread of torque allowance to get the cotter pin holes to line up.
While a AN5 bolt is usually listed at 100-140 in lbs, the torque can be increased to the maximum if needed to get the alignment, which is 225 in lbs.
As usual, add the "drag torque" to the above numbers, but this is pretty minimal for a non-locking nut.
f. When installing a castle nut, start
alignment with the cotter pin hole at the minimum
recommended torque plus friction drag
torque.
NOTE: Do not exceed the maximum
torque plus the friction drag. If the
hole and nut castellation do not align,
change washer or nut and try again.
Exceeding the maximum recommended
torque is not recommended.
https://www.faa.gov/documentLibrary/...Chapter_07.pdf
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
|

11-03-2016, 10:46 AM
|
 |
|
|
Join Date: Jun 2009
Location: Danville, IN (West of Indy)
Posts: 199
|
|
Quote:
Originally Posted by az_gila
AC43.13 allows quite a spread of torque allowance to get the cotter pin holes to line up.
|
Great addition Gill! Thanks.
__________________
Michael
Danville, IN
RV-7A Canopy/Finishing
N317PU Reserved
2020 Dues paid (February 2020)
|

11-03-2016, 10:56 AM
|
 |
|
|
Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,791
|
|
this bolt acts as pin. if you apply torque to the nut to apply a clamp load and the joint moves it will fret and then it will lose the clamp load over time. I snugged mine up hand tight.
__________________
Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 800+ for all
Simplicity is the art in design.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
|
| 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 08:57 AM.
|