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Old 04-09-2010, 02:30 PM
Andy Hill's Avatar
Andy Hill Andy Hill is offline
Join Date: Dec 2005
Posts: 976
Default RV-3 Plans - 'Clarifications'

I have suggested to Paul Dye that we start this thread as a 'sticky'. It is intended as a summary of significant errors / omissions / areas needing clarification in an RV-3(B) build. Paul's seems to like the idea

To keep it separate from the ever expanding "advice" topics, we suspect it will need "moderating" according to a set of rules, which as a first guess might be:
  1. Posts titled with the major sub-structure affected, maybe then with the Part #(s) e.g. Flaps - FL-303
  2. A brief summary of the "apparent" error, and the suggested "solution"
  3. Where possible, expand the above information not in the post, but by links to websites / VAF threads giving further info
  4. Replies - additions to the info e.g. follow up later in a build as to whether it worked or not, use the same post 'title', and maybe the replies can be moderated into the original post...
Summary - to be effective the posts must be concise, and not diverge "off topic"

Andy (Hill)
RV-3 SB going slowly

PS I'll kick off with a sample on Flaps...

Last edited by Andy Hill : 04-09-2010 at 02:48 PM.
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Old 04-09-2010, 02:48 PM
Andy Hill's Avatar
Andy Hill Andy Hill is offline
Join Date: Dec 2005
Posts: 976
Default Flaps - FL-303

Root Rib needs moving inboard

Randy's site info from Dan Benua
DWG 9 - Flaps. ... My solution is to move the FL-303 rib inboard by about 7/8". This places the linkage attach point closer to the curve of the fuselage. To achieve this the top flange of the FL-302 lap spar should be dimensioned to 49.5". The lower flange lengh should be 51", which is the length of the supplied material. The rib and FL-305 reinforcing plate should be mounted coincident with the end of the top flange. (N.B. I haven't yet built the fuselage to conclusively prove that this modification is beneficial!)
This seems to fit in with Tony Spicer's experience as per:Used washers to space a coupling nut on the flap stud where a spacer was required, and Without moving the flap arms inboard the pushrod will contact the inboard edge of the flap fairing.Rob Holmes also had some issues Pic

Follow up(s)
[Andy Hill April 2010] We have built the Flaps with FL-303 moved inboard by 7/8". Will update in ? months/years when we fit to the fuselage

Last edited by Andy Hill : 04-10-2010 at 01:23 AM.
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Old 04-09-2010, 02:51 PM
islandmonkey's Avatar
islandmonkey islandmonkey is offline
Join Date: May 2009
Location: Zurich, Switzerland
Posts: 538
Default Great Idea Andy.

I have already have a section of my build site devoted to this. I have collated all of Paul's relevant posts onto this page in my site and I will be updating it as and when an appropriate post or piece of information comes my way. Here is a list of Paul's posts, that fall under your criteria:

Error on Quick Build Wing

Aileron Gap rivet question

F-303 Center Section Build-up

Lower Forward Stringers in the Fuselage

F-336 “Wall Outlet” SNAFU….

Send me a mail if this is okay, and if Paul wants to expand on these topics later I will edit this post out.
Anthony Johnston
Brit working in Zurich, Switzerland.
1500 hour pilot and ex instructor and examiner.
RV-4 s/n 4572 Emp Kit.
RV-3B s/n 11460 Emp Kit. (In storage).
Anthony's RV-4

Last edited by islandmonkey : 04-09-2010 at 06:38 PM. Reason: Post more relevant data
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Old 04-10-2010, 01:59 AM
Andy Hill's Avatar
Andy Hill Andy Hill is offline
Join Date: Dec 2005
Posts: 976
Default Flaps - Too long?

Flap parts longer than Plans?

DWG 9 shows a distance of 10 1/2" from the Flap TE to the Hinge CL with reference to the fuselage datum. Trig that to the vertical displacement and you get ~10 19/32" as the length measured directly from TE to the Hinge CL.

Putting the (supplied) FL-302 (Spar) and FL-303 (Outboard Rib) into FL-301 (Skin), and adding the hinge as per Plans gave a distance about 5/32" more'. Paul Dye seems to have come across supporting evidence of this RV-3B - Fiddling with Flaps
With the ailerons mounted per plans, and measuring so, we discovered that the flaps were sticking out close to a quarter inches beyond the ailerons.
Solution(s)? Paul describes how he tackled it in the above link. Being a SB, we could try to tackle it closer to source, and moved the Flap Spar back ~2/32", and trimmed the hinge / skin / positioning and got another 2/32". Assembled the distance is 10 20/32" i.e. we seem to have "removed" 4/32" of the 5/32" error... but will only know when we fit ailerons to the wing.

Request(s) for Info: Can others let me know / post here and I'll edit into this post, this measurement for their Flaps, esp QB ones.

Follow up(s)
[Andy Hill Apr 2010] We have built the Flaps with the direct distance of Flap TE to Hinge CL = 10 20/32". Will update when Flaps/Ailerons/Wings all fitted as to how TEs line up
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Old 04-12-2010, 07:59 AM
danbenua danbenua is offline
Join Date: Oct 2007
Location: Hillsboro, OR
Posts: 85
Default Mount aileron's first

I'm not sure what the QB guys are facing, but for a SB wing the
procedure is straight forward. Mount the ailerons first and use
an airfoil template to be sure they are exactly in trail. Build
the flaps next, and drill the hinge to them. You don't have much
flexibility on the distance from the flap spar to trailing edge unless
you modify the shape of the end ribs. Finally, trim the trailing edge
of the lower skin so that the flap and aileron trailing edges are
in line when the other half of the hinge is drilled. The flap brace is f
abricated an mounted after the skin edge is trimmed.

You should considered the dimensions on the plans to be only
advisory. On this airplane, nearly everything is "trim to fit".
You always have to be thinking about which dimensions are
not adjustable, and then adjusting everything else to make
things match.

- Dan Benua
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Old 04-12-2010, 08:09 AM
Ironflight's Avatar
Ironflight Ironflight is offline
VAF Moderator / Line Boy
Join Date: Jan 2005
Location: Dayton, NV
Posts: 12,829
Default Rear Deck Access/Lightening Holes

When fabricating the rear fuselage deck, I laid out the holes (forward round one, middle "pear-shaped, aft rectangle) per the drawings, and it just didn't look right - the rectangular hole at the back looked too far aft by about an inch. These holes are located on the drawing by measuring incrementally from the front of the deck, and I discovered that the "8 inches" seemed to be the error - it put the pear-shaped and rectangular holes an inch too far back. I laid it out again replacing the "8" with a "7", and everything fit much better.

Treat this as a "potential" plans issue - I'll report further if I have created a new problem by changing the locations.

Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)

Last edited by Ironflight : 04-13-2010 at 11:50 AM.
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Old 04-12-2010, 08:33 AM
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rph142 rph142 is offline
Join Date: Feb 2007
Location: Walnut Creek CA
Posts: 518
Default HS rear spar rivet spacing

When constructing the rear spar of the horizantal stabilizer, pay close attention to the rivet spacing in the area where the fuselage - HS attachment bars will be bolted on. You must leave plenty of space between rivets in order for these bars to sit flush.

When drilling the rivets for the rear deck access plate, pay close attention to the rivet locations in the area that the front horizantal stabalizer angle bracket will be attached. The rivets holding down the rear access plate could interfere with the front spar hold down angle.
Rob Holmes
RV-3B N59LG - Built, Flown, Sold!
Extra 300 N111XW - Partner, Flown, Sold!
RV-7 NxxxLG
The minimum number of planes one should own is one. The correct number is n+1, where n is the number of planes currently owned. This equation may also be re-written as s-1, where s is the number of planes owned that would result in separation from your partner.

- Veluminati
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Old 02-24-2011, 07:05 PM
PeterP PeterP is offline
Join Date: Feb 2011
Location: Ocean Grove Victoria Australia
Posts: 25
Default Elevator Horns

Hi Guys,

Not sure if I`m in the right place or not but here goes,
Fitting elevators to HS to drill horns for centre bearing, set rod ends to 3/4 to get 2" between spars but horn hits attach bolt on centre bearing bracket before getting enough down travel, increased rod end to 7/8 on inboard hinge but still restricts travel. Is it the plans or is it me. Looking for suggestions on what others might have done.

Peter Pendergast
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Old 02-24-2011, 08:26 PM
mvs163 mvs163 is offline
Join Date: Jan 2008
Location: Southern Ontario
Posts: 109

Hi Peter,
If I understand correctly, the flange of the steel horn hits the bottom AN3 bolt heads that hold the centre brg to the stab spar ?
My horns were RV 4 parts and oversize, I cut them down and rewelded one I recall.
I believe they were too long also, centre bearing to pushrod hole.
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Old 02-24-2011, 11:21 PM
PeterP PeterP is offline
Join Date: Feb 2011
Location: Ocean Grove Victoria Australia
Posts: 25

Hi Mike,

You are correct, horns are bigger in every way. If I leave inboard rod end at 7/8 instead of 3/4 I get minimum control deflection, will think about a fix for that in time, will 4 1/4 to the push rod rod end be a problem?
I`ve built a couple of 7`s round hole round peg must be right but the 3 certainly has my old brain in overdrive.

thanks Peter
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