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  #1  
Old 12-05-2012, 10:57 PM
ron sterba ron sterba is offline
 
Join Date: May 2007
Location: salem Oregon
Posts: 1,023
Cool 9A owners with wings on, got a question

QbRV9a. I just fitted my flaps on. My wing tip, aileron and flap trailing edge all line up perfectly BUT I noticed that the flaps at the trailing edge next to the fuselage are down about 3/8" to 1/2" below the fuselage.I noticed the flange on the last inboard flap rib overlaps the bottom fuselage by 2". With keeping all those trailing edge surfaces lined up, can I bend that inboard flange in a small arc to meet the fuselage? I am NOT finding in my VANS (A HOW-TO plan book) to deal with this. If I use a 2 foot straight edge off either the top or bottom of the wing skin it appears the flap is in the correct position when its in that 1/2" down position. I used that gauge for centering the ailerons ( I think it is the W930 gauge) to what I thought was the perfectly center position. Both ailerons are at the same elevation and have the same difference in distance down when the 1/2" flap distance is raised to ZERO. Just a note here of observation,when the flaps are in the TOTALLY up position the trailing wing skin rubs on the flap skin. Looking for answers on close tolerances. Thats the way I build things. Ron in Oregon
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  #2  
Old 12-06-2012, 12:35 AM
Don Jones's Avatar
Don Jones Don Jones is offline
 
Join Date: Nov 2005
Location: Snohomish, Washington
Posts: 699
Default Ailerons?

Did you make the tool to align the aileron using the tooling holes in the outboard wing rib?? I think the tool you reference is just for holding the bellcrank in the neutral position. I just hung my wings for the final time, the flaps are tight against the fuselage. I have heard others have had to bend the skin of the flap like you suggested to make it close the gap to the fuse, but mine didn't come out that way. By the way, I had to cut both wingtips to make them align with the aileron when I used the tool to align the ailerons using the tooling holes.
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Last edited by Don Jones : 12-06-2012 at 12:37 AM.
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  #3  
Old 12-06-2012, 04:46 AM
thinkn9a thinkn9a is offline
 
Join Date: Nov 2007
Location: Mississippi
Posts: 282
Default gotta gap,.... and yep, they rub

I looked at several different planes and found several different gaps between flap and fuse.

On the wings... you will see various options discussed on this forum, on where to place "rub tape", either on the flap or on the wing skin.
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  #4  
Old 12-06-2012, 07:20 AM
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rv9av8tr rv9av8tr is offline
 
Join Date: Dec 2006
Location: Portland, OR
Posts: 827
Default flap skin flush to fuse

Using the end rib tooling holes for aligning the ailerons, per plans, mine came out just like Don's. If the flaps are 1/2" off... then I can't help but think something is wrong. My plane had no heavy wing on first flight.
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  #5  
Old 12-06-2012, 08:35 AM
alpinelakespilot2000 alpinelakespilot2000 is offline
 
Join Date: Jan 2005
Posts: 3,646
Default

Assuming you properly aligned the aileron, the most likely explanation is that your aileron or, much more likely, your flap has a bit of twist in it. The trailing edge of that extra long RV-9/9A flap can be perfectly straight yet still have twist (or warp). I've noticed this quite often. In my case, the flaps fit at the fuse nicely but I apparently built about 1/4" of twist into mine where they meet the ailerons.
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  #6  
Old 12-06-2012, 09:32 AM
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647jc 647jc is offline
 
Join Date: May 2006
Location: Ankeny, Iowa
Posts: 434
Default

Ron,

My QB wings and fuselage lined up just like yours. I followed all the allignment procedures and used all the jigs. I had experienced help when I mounted the wings and they just turned out like you descibe.

The plane has been flying for over 250 hours, flys hands-off (when vertical trimmed) at all speeds. If I look at the elevator position when in cruise flight (about 180 mph TAS), it appears alligned with the HS. Top speed is 'as advertised' by Van.

Only issue I have is that I can easily red-line the recommended Sensenich 79" prop at 7800 DA. According to what I have read, at 7800 DA with a standard O320 / 160 hp engine, I should not be able to red-line (2600 rpm) the prop. So, I think the plane is well rigged and slick and I don't think the space between the trailing flap edge and fuselage is an issue on my plane.

I would like some day to try an 80" or 81" prop to see if that increases my top speed which is now about 193 mph TAS without red-lining the prop.
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  #7  
Old 12-06-2012, 09:41 AM
mcattell mcattell is offline
 
Join Date: Feb 2006
Location: Forest Grove, OR
Posts: 239
Default

Ron,

My flaps are also up tight against the bottom of the fuselage. Although one side is tighter than the other side. I hear that is typical. Perhaps you should double check the wing incidence to make sure you drilled that critical hole for the aft spar connection in the correct spot. That could easily explain the difference but let's hope that's not the case.

When I was at the factory the other day I noticed that Van's trimmed the end of the flap skin off just aft of the connecting rod. So the factory RV-9A does not have an overlap on the back half of the flap and there is actually a gap. It got me wondering if I did it right by leaving my skin with full overlap. I haven't had a chance to look at the plans since. You'd think it would be best not to have a gap and I'm not sure why Van's trimmed theirs.
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  #8  
Old 12-06-2012, 10:41 AM
Rupester Rupester is offline
 
Join Date: Dec 2005
Location: Mahomet, Illinois
Posts: 2,195
Default

My QB wings, ailerons, and flaps lined up nicely, allowing the inboard flap to nestle to the fuse within 1/8" on both sides. I think much of that was the excessive time I spent adjusting, checking, and readjusting the aileron rigging using the W-930 tool and the wing end jig bolted on the tooling holes. I still ended up splitting and regluing the wingtips, though... they were off by 3/8" or more.

I've seen another 9A on which the builder fab'ed a small piece with a joggle that he riveted to the inboard flap end .. .to match the fuse bottom contour perfectly.
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  #9  
Old 12-06-2012, 10:53 AM
mcattell mcattell is offline
 
Join Date: Feb 2006
Location: Forest Grove, OR
Posts: 239
Default

Here's a photo of the factory RV-9A flap end. You'll notice how the bottom skin is trimmed off past the rod bearing. Has anyone else done this or did I miss that detail in the instructions?

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  #10  
Old 12-06-2012, 11:05 AM
ron sterba ron sterba is offline
 
Join Date: May 2007
Location: salem Oregon
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Default

Hello Don, Yes I used the tooling holes on the outboard rib just as they stated in the plans.Tried to get a exact fit to within 1/32" of a inch.

Ron
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