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  #31  
Old 02-14-2009, 01:06 PM
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rvmills rvmills is offline
 
Join Date: Nov 2007
Location: Georgetown, TX
Posts: 2,143
Default

Quote:
Originally Posted by L.Adamson View Post
I have my secondary & redundant control system all worked out...........


In case of joystick failure. I'll just leave the wireless passenger stick, firmly bolted in................no matter how fat the passenger is!

L.Adamson --- RV6A
Gotta agree with ya there Larry...mine's staying put too. My kiddos and friends would scream foul!

But mine's not wireless...that's pretty hi tech...what'd ya use, 803.b or .g?

Cheers,
Bob
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  #32  
Old 02-14-2009, 01:30 PM
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L.Adamson L.Adamson is offline
 
Join Date: Apr 2005
Location: KSLC
Posts: 4,021
Default

Quote:
Originally Posted by rvmills View Post
Gotta agree with ya there Larry...mine's staying put too. My kiddos and friends would scream foul!

But mine's not wireless...that's pretty hi tech...what'd ya use, 803.b or .g?

Cheers,
Bob
Actually, in my case,...............being "wireless", means the passenger PTT is on the panel!

L.Adamson --- RV6A
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  #33  
Old 02-14-2009, 01:56 PM
Bevan Bevan is offline
 
Join Date: Sep 2007
Location: BC
Posts: 1,698
Default below pivot

Why not put the wire exit hole BELOW the pivot point? This way there are NO elevator loads, only aileron loads which are, I would think, considerably less.

Bevan
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  #34  
Old 02-14-2009, 06:52 PM
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Bill Wightman Bill Wightman is offline
 
Join Date: Aug 2005
Location: OKC, OK
Posts: 687
Default Alternate hole locations

A few of you have asked about putting the hole in a better place in the stick. The analysis I did had the hole in just about the worst possible location, and it was 1/2" diameter to boot.

I have a couple comments about alternate locations: First, consider putting the hole in the side of the stick rather than the front or back. This is simply because the roll forces on the stick are less than the pitch forces. I'd guess off-hand that the roll forces are maybe 2/3 or even 1/2 the pitch forces. That would result in a corresponding decrease in stress around the hole.

Second, placing the hole further UP the stick is better than closer to the pivot. The controlling distance is what's measured from the hole to the application of load, ie the stick grip. Locating the hole higher up on the stick does give us some other problems to deal with and those have already been discussed.

Finally, there's no substitute for an actual test of this part. The FEM analysis is pretty and it has merit for showing how stress is distributed. BUT its hard sometimes to draw the correct conclustions from this type of analysis.

I'll try and get a few tests in for y'all.
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  #35  
Old 02-15-2009, 07:25 AM
PJSeipel PJSeipel is offline
 
Join Date: Jan 2005
Location: Albany, GA for the moment
Posts: 294
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Quote:
Originally Posted by chaskuss View Post
Mat,
Another solution would be to run the wiring harness externally along the outside of the control stick. McMaster-Carr and MSC sell nice spring steel clips for this purpose. The clips are shaped like a C, with a bulge (for the harness) in the middle of the C. Two or three clips (or other securing methods) will keep the harness in place.
Charlie Kuss
Charlie,

Do you have a part number or a better idea of what these are called? I'm interested in something like this, but I've searched all over McMaster and MSC's websites and I can't find them. Obviously I'm not using the right search terms.

Thanks,
PJ Seipel
RV-10 #40032
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  #36  
Old 02-15-2009, 08:08 AM
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derLuigi derLuigi is offline
 
Join Date: Aug 2006
Location: Aachen, Germany
Posts: 92
Default loads below pivot point

Hi all,

Quote:
Originally Posted by Bevan View Post
Why not put the wire exit hole BELOW the pivot point? This way there are NO elevator loads, only aileron loads which are, I would think, considerably less.

Bevan
The elevator loads aren't gone below the pivot point (we are still talking about the RV-8, right?). There's a steady rise of moment from the point you apply force to the stick to the pivot point, then a steady decrease to the attatchement point of the elevator pushrod. The shearing loads change direction and increase at the pivot point. The aileron forces however should be gone below the pivot point (the point where the stick is bolted to the welded construction, see rick's pics).

Still, drilling holes in this area of the stick scares me a lot, I'll have a close look at mine (side by side) when I come to that task.

Kind regards,

Mario
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  #37  
Old 02-15-2009, 10:58 AM
clam clam is offline
 
Join Date: Oct 2005
Location: Lakeland, TN
Posts: 199
Default try fig 4-38, p 4-172

Quote:
Originally Posted by sprucemoose View Post
Another interesting idea, except I don't find this in AC43-13. Do you have a page number?
try fig 4-38, p 4-172
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  #38  
Old 02-15-2009, 01:44 PM
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sprucemoose sprucemoose is offline
 
Join Date: Jan 2005
Location: MKE
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Quote:
Originally Posted by clam View Post
try fig 4-38, p 4-172
This figure deals with using a split sleeve to repair a damaged tube section. I was thinking about this as a way to reinforce the area in the stick where the hole would be, but it seems like an awfully heavy, overkill way to do it.

I think I have a better idea now after re-reading the post. What you are talking about is making a T-joint right over the hole in the stick (similar to putting holes within a cluster joint for line oil to penetrate) then cutting off the vertical leg of the T after welding, so that only 1/8 inch or so remains. This seems like a good alternative to welding on a washer. My next question is- does the vertical have to be the same diameter of the stick? If the hole is 1/4, why not use 5/8 or so tubing for this?
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  #39  
Old 02-15-2009, 03:40 PM
Bevan Bevan is offline
 
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Location: BC
Posts: 1,698
Default

Mario,

On my stick (RV7A), the lower portion of the stick (below the pivot) is aileron loads only.

Bevan
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  #40  
Old 02-06-2020, 10:30 AM
LynolA LynolA is offline
 
Join Date: Apr 2010
Location: Vancouver, BC
Posts: 22
Default Infinity Grip Wire Routing - Control Stick Hole Doubler

I added a hole to my control sticks for the Infinity Grip under the pivot and on the side. Under the pivot for reduced stresses on elevator loads. On the side to reduce moment caused by lighter aileron loads. TIG welded doubler made from trimmed portion of stick.

https://drive.google.com/file/d/1v79...ew?usp=sharing
https://drive.google.com/file/d/1TVZ...ew?usp=sharing

Installed cable at hole interface with silicon tape wrapped and cable tied to stick to reduce any movement at cable exit through hole. Cable routes to bottom with a loop on inner skin, wrapped in snake skin to prevent wear or chafing.

https://drive.google.com/file/d/13zQ...ew?usp=sharing
https://drive.google.com/file/d/1Gph...ew?usp=sharing
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