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  #1  
Old 09-24-2008, 03:16 PM
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777Dave 777Dave is offline
 
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Location: Picton, Ont., Ft. Myers, Fl
Posts: 263
Default flap handle...

Have been considering electric flap conversion for a while but really don't mind the manual flaps except that I have discovered that sometimes when I take full flap, even below 80 mph, the handle doesn't fully engage into the notch on the side of the seat. After playing with it on the ground for a bit, I can see that when there is an air load on the flap, you have to pull fairly hard to extend them and in doing so the handle tends to twist enough that the bottom edge doesn't enter the slot...somewhat uncomfortable feeling.

Has anyone reinforced their handle to keep it from twisting? Seems like I may try that starting right at the base of the handle itself. Comments?
Thanks
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  #2  
Old 09-25-2008, 10:20 AM
John_RV4 John_RV4 is offline
 
Join Date: Jan 2005
Location: New Hampshire
Posts: 250
Default The notch..

I haven't had any issue with full flaps. But my first notch position is not as positive as full. You might want to take a look at the notch itself.

I've never noticed the handle twist. But I've never looked for it either. It's going to rain here for 4 days. So, I doubt i'll be looking at it soon :-(

John
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  #3  
Old 09-25-2008, 11:40 AM
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777Dave 777Dave is offline
 
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Default flaps and arms...

Thanks John... The detents on my a/c are very positive and secure when there is no load on the flaps and in the air, the first notch is fine also but the second is hit and miss and I think the "twist" when I pull hard is the reason.
Because of the lack of elbow room, when I pull up, my wrist tends to rotate counterclockwise and twist the handle in the same direction... goimg to have to play with it on the ground with someone holding the flaps up and me sitting in the seat to see if I can adjust the way I hold my arm and pull.
As I mentioned ,I really would rather stick with the manual flaps I think.

Cheers
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Last edited by 777Dave : 10-19-2008 at 08:30 PM. Reason: sp
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  #4  
Old 09-25-2008, 11:49 AM
John_RV4 John_RV4 is offline
 
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Location: New Hampshire
Posts: 250
Default like many things.....

I thought I would also immediately install the electric flaps. After living with the manual flaps, I see no reason to change them. I think your idea of practicing is a good one.

I also had an issue when I first bought the plane. After applying full flaps, I couldn't retract them. One day I had to do a go around (due to wind sheer that's my story and I'm sticking to it!!). I was 200 miles from home with full flaps and **** near pulled the handle out trying to retract them. I finally relaxed for a minute and carefully watched the handle noticing that it was necessary to pull the handle in (toward the centerline of the plane) slightly before pulling up and out of the notch. Never had a problem since, but would have been much easier to figure out on the ground....

Later

John
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  #5  
Old 09-25-2008, 01:34 PM
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AX-O AX-O is offline
 
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Location: SoCal
Posts: 2,128
Default

Can't remember were this data came from but....

It said to twist the handle in the opposite direction in order to mitigate the problem while using the flaps. It also said that if the handle is twisting, a high load is on the flaps and that airspeed should be decreased prior to lowering to the next step.

I am not flying yet but plan on doing it. The information came from the RVator or my plans.
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  #6  
Old 09-25-2008, 02:14 PM
Brian Vickers Brian Vickers is offline
 
Join Date: Mar 2005
Location: Bainbridge Island, WA
Posts: 317
Default Reinforced my flap handle

This is a common Art Chard mod. He builds RV's on contract and was a long time employee and prototype builder at Vans. It seems to work fine in the shop. My airplane isnít flying yet. The reinforcement was simple to accomplish as you can see by the photo.

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  #7  
Old 09-25-2008, 08:53 PM
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777Dave 777Dave is offline
 
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Default !

YES Brian, that's exactly what I was thinking!!!!!!!!!!!! Should solve the problem nicely. Thanks for the pic.
For me, this is a safety issue... don't want flap to retract at the "wrong" time. I will do this mod ASAP.

Cheers
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  #8  
Old 09-26-2008, 07:28 PM
dealfair dealfair is offline
 
Join Date: Feb 2006
Location: George West, TX
Posts: 567
Default Notch Problem

Dave,

I'm thinking you have a notch problem. What you describe is very common in RV-4s. I'm flying my second -4. Put 1,440 hrs on the first one without ever having the "flap slip" problem.

I couldn't get the handle to stick in the second notch on my present -4. Would use only the first flap for landing. Thought the problem was my expanding BUTT due to beer and BarBQ.

One day, some time past, I clicked on SafeAir1's site and looked at their link to Darrell Morgan's Firebird Aviation. He has a 1.85MG download of his rebuild of a RV-4. On page 13 of 15, he has excellent photos of his solution to the notch problem. It is a laminated build with deep detents. I copied it and do not suffer the slip problem any more. (Thanks mucho Darrell!!)

Try this link: http://www.firebirdaviation.com/FA1_...h%20Full_e.pdf

If that doesn't work for you, go to www.SafeAir1.com and click on Firebird Aviation. It is really a good fix. I personally don't think the flexing handle is your real problem. Just get a good detent that will hold the handle.

Best of luck,

Deal Fair

RV-4 Flying (when I get my P-Mags back)
George West, TX (8T6)
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  #9  
Old 09-26-2008, 08:59 PM
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777Dave 777Dave is offline
 
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Default

Thanks for your reply and link Deal. I will have a very close look at my notches too. I have never had the flap handle actually slip out of the notch but I have had it fail to fully engage so it may need reworking or replacing. In my case, the handle partially catches the notch sometimes and seems to stay there but is obviously not right. I think the twisted handle is the key but will play with it some more to be sure. Won't get a chance to do any work for a couple of weeks. (work)

Thanks again.
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  #10  
Old 09-27-2008, 03:01 AM
dealfair dealfair is offline
 
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Location: George West, TX
Posts: 567
Default

I like the reinfored handle idea also. It appears too easy of a fix not to do. I'm going to add that too. Good photo Brian.

Thanks all,

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