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01-06-2014, 08:14 PM
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Join Date: Nov 2013
Location: Belleville, il
Posts: 124
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Should I question the plans?
Working on the rudder, page 07-07. Step 3 instructs to final drill 2 ribs to skin. Step 5 instructs to remove the skins. Why doesn't it say to final drill the other 8 ribs and spar to skin holes? All the skin to structure holes are dimpled, but the plans only have 2 ribs final drilled. Do I follow the plans or assume that all holes should be matched drilled? I am a first time builder and have no experience. I see no reason to not final drill all holes, but my reasoning has not always served me well.
Last edited by Barneybc12d : 01-06-2014 at 08:28 PM.
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01-06-2014, 08:32 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by Barneybc12d
Working on the rudder, page 07-07. Step 3 instructs to final drill 2 ribs to skin. Step 5 instructs to remove the skins. Why doesn't it say to final drill the other 8 ribs and spar to skin holes? All the skin to structure holes are dimpled, but the plans only have 2 ribs final drilled. Do I follow the plans or assume that all holes should be matched drilled?
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Nothing wrong with questioning... as long as you find an answer to your question (like confirming there is a plans error, or you just didn't understand what it said, etc.) before using a different process.
The RV-14 was designed with rivet holes at final size, that do not need to be final drilled.
In some instances, the RV-14 uses RV-10 parts, which were not designed to final size. So, in some cases, it is possible that you will be told to final drill just a couple parts, but not all. Do the parts in question have RV-10 part number's?
A good cross check. A rivet of appropriate size will fit in a prepunch hole that does not require final drilling. If a rivet wont slip through a hole that hasn't been final drilled, then it should be.
__________________
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 ")
Last edited by rvbuilder2002 : 01-06-2014 at 08:35 PM.
Reason: added cross check
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01-06-2014, 09:32 PM
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Join Date: Nov 2013
Location: Belleville, il
Posts: 124
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That makes sense. The parts were R-903 rudder tip rib and R-912 counterbalance rib. They were already sized because I was able to use a #40 reamer. Thanks for the tip.
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01-06-2014, 09:38 PM
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Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
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You always question the plans with Van's... geez you would think they would revise them when errors come forth. My RV7 plans were FULL of errors and no notice was ever really put out. You RV12 and RV14 guys are getting spoiled. 
__________________
Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
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01-06-2014, 10:34 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by Barneybc12d
That makes sense. The parts were R-903 rudder tip rib and R-912 counterbalance rib. They were already sized because I was able to use a #40 reamer. Thanks for the tip.
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I forgot, there are a few RV-9 parts thrown in also...
__________________
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 ")
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01-07-2014, 08:36 AM
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Join Date: Apr 2010
Location: Chicago, IL
Posts: 356
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My question from the plans was regarding deburring of the pre-punched #40 holes. The plans seemed cryptic to me as to whether the holes pre-punched to final size needed deburring.
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01-07-2014, 08:42 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,768
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The deburring question can be answered easily. Run your bare hand across the holes. If they feel smooth, build on. If they feel rough, then debur.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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01-07-2014, 10:12 AM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by n982sx
My question from the plans was regarding deburring of the pre-punched #40 holes. The plans seemed cryptic to me as to whether the holes pre-punched to final size needed deburring.
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The current version of Chapter 5 of your construction manual (you can get it from the support section of Van's web site) says...
"All drilled holes, or prepunched holes that have been final drilled to a larger size should be deburred. Holes that were factory punched to final size can be inspected and only deburred if needed (with the exception of large holes to be dimpled for screws - see below)..."
__________________
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 ")
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01-07-2014, 06:41 PM
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Join Date: Jan 2013
Location: D.C.
Posts: 303
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Yet another rookie question?
I have been using the same bits to "final" drill and "match" drill. Does anyone suggest any other methods?
My method seems to be fine, just a side thought.
Paul
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Paul M.
Fayetteville, NC
Airport Bum
RV-4 / PA28-180
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01-07-2014, 07:46 PM
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Join Date: Feb 2012
Location: Burleson, TX
Posts: 270
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Quote:
Originally Posted by Icarus
Yet another rookie question?
I have been using the same bits to "final" drill and "match" drill. Does anyone suggest any other methods?
My method seems to be fine, just a side thought.
Paul
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You're doing great. Carry on.
__________________
K.C.
RV-14A #140026
Wings 70%. Emp 70%
Happy to be a 2020 =VAF= contributor
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