Re: [COUPERS-TECH] Rigging addendum for E model

[Hartmut Beil]

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" say 20 up, 12 down.  And why not, from a flying standpoint?"

 

Chris.

With a 20 degree up non-split elevator, the plane is easier to stall - not good in a Coupe.

 

Fred Weiks patented aircraft design element that makes our Coupes stall and spin proof, is the elevator restriction.

 

When choosing the airfoil, Fred took one that had a non forgiving stall characteristic - one is not easily to be brought out of the stalled regime.

You need significant speed increase to get it flying again.

For the Ercoupe design this doesn't matter, because Fred was counting on the elevator restriction that would keep the airfoil out of that stalled regime.

 

The split elevator installation does also include the installation of a spring that makes it harder to move the elevator above 13 degrees up, thus keeping the plane at speeds of around 65 MPH, even when you trim it for slower speeds. It takes some effort to overcome the force of the spring.

I am flying with that spring and is a wonderful safety device. It avoids that the plane to getting close to stalling speed when you let go on the controls. (To close canopies in flight or search the bags behind you for a flashlight)

 

Erco supported the installation of the split elevator in one of its service bulletins if I remember right.

Installing the split tail does not change the model designation, therefore should be relatively easy to be implemented on your 415/C without sacrificing the Sport Pilot ability.

 

Hartmut

 

 

----- Original Message -----

From: Chris

To: tech@ercoupers.com

Sent: Thursday, November 02, 2006 4:31 AM

Subject: RE: [COUPERS-TECH] Rigging addendum for E model

----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----

It is not legal, but I would prefer to have my 415C rigged so the dang elevator goes all the way, say 20 up, 12 down.  And why not, from a flying standpoint?

 

Chris

Ed Burkhead <[EMAIL PROTECTED]> wrote:

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Scott,

 

Is this the information you need?

 

Check elevator up travel to specs using drilled hole in rudders. 415C, CD, D, E are different as is Forney, Alon, Mooney. On rudder, lay out line at right angles to leading edge of rudder from point midway between attaching bolts of center hinge, and running to rudder trailing edge. From intersection of this line and rudder trailing edge, measure up or downward to find travel of elevator. See if it looks close for pre-purchase inspection, then get rigging re-done when you can. It'll take about eight hours or so for someone who knows what he's doing to re-rig the plane, assuming you don't have to replace parts.

Elevator:
415-C: up 13° down 12° (3.25" up ±.25", 2.88" down ±.5")
415-D: up 9° down 12° (2.2" up ±.25", 2.88" down ±.5")
415-E, G, Forney F-, F-1A, Alon A-2, A2-A: up 20°, down 10° (4.9" up, 2.5" down)
M-10: up 25°-24° down 32°-36°

Trim:
415-C: up ? down ?
415-D: up 0° down 60°
415-E, G, Forney F-1, F-1A, Alon A-2, A2-A: up 10° down 36°
M-10 up 7°-10° down 32°-36°

Sorry I can’t remember the sources I used to compile this info.  It was from official sources, but I compiled this sometime in the ’92-’94 timeframe while I was editing Coupe Capers.

 

It’s part of my pre-purchase inspection article.

http://edburkhead.com/Ercoupe/pre-purchase.html

 

Ed Burkhead

http://edburkhead.com

ed -at- edburkhead???.com          (change -at- to @ and remove "???")

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