Today's Message Index:
----------------------
1. 08:04 AM - Re: Re: RV4 Left Wing Flap Push Rod (Jerry Grimmonpre)
2. 09:31 AM - Re: Re: RV4 Left Wing Flap Push Rod (Steve Sampson)
3. 06:53 PM - Re: Re: RV4 Left Wing Flap Push Rod (Jerry Grimmonpre)
Message 1
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| Subject: | Re: RV4 Left Wing Flap Push Rod |
Hal ... many thanks for your follow-up. I confirm that the flap motor
is going to it's own limits and thereby acting as the "stops" for the
entire flap system, up and down.
I did call Van's about this issue. The person will remain nameless but
said, "the fuselage interference is OK to act as the stops". I find it
hard to agree with this notion in view of the adjustments available in
the main push rod, nearest the motor, and then the second adjustment
within the left and right push rods. The compelling reason is that the
left/right push rods bend the fuselage metal when they repeatedly
contact this area. Secondly this interference is going to wear on the
push rod and creating a stress riser.
I will request the latest in electric flap install sheets and talk to
someone else at Van's to confirm my suspicions about the basic operating
philosophy.
Thanks ...
Jerry
----- Original Message -----
From: halbenjamin@optonline.net
To: rv4-list@matronics.com
Sent: Wednesday, October 22, 2008 10:05 PM
Subject: Re: RV4-List: Re: RV4 Left Wing Flap Push Rod
Hi Jerry,
I looked for the paperwork, but wasn't able to find it. But basically,
the flap motor is controlled with a momentary switch. When you hold the
switch in the up or down position, the motor will run until you release
the switch, or its actuator rod reaches the limit of its travel. There
are no external switches, or airframe stops.
If my memory serves me correctly, the flap position is adjusted by
changing the length of the rod connects the two horizontal bars to the
flap weldment arm, and by the length of the wing flap push rods.
You could always call Van's & see if you can get a copy of the
installation sheets for the electric flap conversion.
Good luck!
Hal Benjamin RV-4
Long Island, NY
FWF
----- Original Message -----
From: Jerry Grimmonpre
Date: Monday, October 20, 2008 11:16 am
Subject: RV4-List: Re: RV4 Left Wing Flap Push Rod
To: rv4-list@matronics.com
>
> My thanks to Hal and Ben for their reply to the above ...
> I will order a new push rod for the left side because the
> original one shows
> signs of stress.
>
> Another question:
>
> How do the flaps stop their up/down travel ... is it through
> limit switches
> on the motor or stopping at airframe structure?
>
> If it's limit switches I can replace or adjust those. If it's
> structure of
> the airframe I can't find that in the building manual. My
> building manual
> only addresses manually deployed wing flaps.
>
> The paper work (one sheet) explaining electric flaps, doesn't
> mention any
> stops when going down or up.
> Could someone please explain the electric flap stops at the up
> and down
> limits? Maybe cite the page or reference.
> Jerry Grimmonpre
> Huntley IL
Message 2
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| Subject: | Re: RV4 Left Wing Flap Push Rod |
Jerry, rest assured the installation sheet sais "Pause frequently to check
that there is no interference or binding."
EF-404 (The threaded shaft) is used to set the retracted position. There
are a couple of pictures of my set up
here.<http://gikonfuse.blogspot.com/2007/02/control-system.html#links>
Max down is 40 deg. The rather strange design of the motor means there is no
damage if you keep running the motor at each end of its travel. On climb out
I just hold the switch up until the flaps must have retracted fully. I only
look later when I am up a few hundred feet.
While I think of it dont forget the
AD,<http://gikonfuse.blogspot.com/2006/07/dont-forget-to-lock-wire-flap-motor.html#links>
Hope that helps. Steve
2008/10/23 Jerry Grimmonpre <jerry@mc.net>
> Hal ... many thanks for your follow-up. I confirm that the flap motor
> is going to it's own limits and thereby acting as the "stops" for the entire
> flap system, up and down.
> I did call Van's about this issue. The person will remain nameless but
> said, "the fuselage interference is OK to act as the stops". I find it hard
> to agree with this notion in view of the adjustments available in the main
> push rod, nearest the motor, and then the second adjustment within the left
> and right push rods. The compelling reason is that the left/right push
> rods bend the fuselage metal when they repeatedly contact this area.
> Secondly this interference is going to wear on the push rod and creating a
> stress riser.
>
> I will request the latest in electric flap install sheets and talk to
> someone else at Van's to confirm my suspicions about the basic operating
> philosophy.
> Thanks ...
> Jerry
>
>
> ----- Original Message -----
> *From:* halbenjamin@optonline.net
> *To:* rv4-list@matronics.com
> *Sent:* Wednesday, October 22, 2008 10:05 PM
> *Subject:* Re: RV4-List: Re: RV4 Left Wing Flap Push Rod
>
> Hi Jerry,
>
> I looked for the paperwork, but wasn't able to find it. But basically, the
> flap motor is controlled with a momentary switch. When you hold the
> switch in the up or down position, the motor will run until you release the
> switch, or its actuator rod reaches the limit of its travel. There are no
> external switches, or airframe stops.
>
> If my memory serves me correctly, the flap position is adjusted by changing
> the length of the rod connects the two horizontal bars to the flap
> weldment arm, and by the length of the wing flap push rods.
>
> You could always call Van's & see if you can get a copy of the installation
> sheets for the electric flap conversion.
>
> Good luck!
>
> Hal Benjamin RV-4
> Long Island, NY
> FWF
>
> ----- Original Message -----
> From: Jerry Grimmonpre
> Date: Monday, October 20, 2008 11:16 am
> Subject: RV4-List: Re: RV4 Left Wing Flap Push Rod
> To: rv4-list@matronics.com
>
> >
> > My thanks to Hal and Ben for their reply to the above ...
> > I will order a new push rod for the left side because the
> > original one shows
> > signs of stress.
> >
> > Another question:
> >
> > How do the flaps stop their up/down travel ... is it through
> > limit switches
> > on the motor or stopping at airframe structure?
> >
> > If it's limit switches I can replace or adjust those. If it's
> > structure of
> > the airframe I can't find that in the building manual. My
> > building manual
> > only addresses manually deployed wing flaps.
> >
> > The paper work (one sheet) explaining electric flaps, doesn't
> > mention any
> > stops when going down or up.
> > Could someone please explain the electric flap stops at the up
> > and down
> > limits? Maybe cite the page or reference.
> > Jerry Grimmonpre
> > Huntley IL
>
>
> *
>
>
Message 3
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| Subject: | Re: RV4 Left Wing Flap Push Rod |
Steve ... Thanks again for your comments ... rich with links as well,
you seem well organized.
I will readjust my flaps so the push rods don't hit anything on the
structure or skin.
I like Van's philosophy of keep 'em light and efficient and simple. The
flip side is one has to keep an eye out for surprises caused by simple
eyeball engineering in some cases. These 4's do travel quite quickly
and that's a very good thing.
You have a good looking site
Regards ...
Jerry
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