Today's Message Index:
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1. 10:52 PM - Re: Elevator trim rigging (Dave Cudney)
2. 11:12 PM - Re: Elevator trim rigging (Michael Crawford)
Message 1
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| Subject: | Re: Elevator trim rigging |
Rafael:
I just got back from a trip and saw your question about the trim
travel. I measured mine today and it is very close to your
measurement. I have 20.3 up trim (down movement of the trim tab) and
24.8 down trim (up movement of the trim tab) for a total of 45.3.
As I recall from the last RV that I flew you use very little of the
trim tab to adjust for approach speed and curse. I see no method of
getting more travel without changing the trim servo. Maybe someone
else has a method to get more travel from the servo.
good luck
dave
RV 7A
Starting on the cowling
On Aug 4, 2007, at 7:54 AM, Rafael wrote:
> Thanks again, John for your suggestion.
>
>
> I bent the rod a few degrees and that worked very well. It not
> only gave me good clearance, but I was also to correct for the
> slight miss-alignment.
>
>
> I now have another question: I measure a trim control of 20.6
> degrees up trim max. and 23.2 degrees down trim max. Van=92s
> figures, on section 15: Flight Controls, call for Maximum up/down
> of 25-35 degrees. That implies to me that a minimum travel of 50
> degrees is necessary. I=92m getting 43.8 degrees, so there=92s no way
> to meet these numbers. It=92s all that the motor actuator will give.
>
>
> Any comments as to what=92s going on?
>
>
> Thanks and regards,
>
>
> Rafael
>
>
> From: owner-rv7-list-server@matronics.com [mailto:owner-rv7-list-
> server@matronics.com] On Behalf Of Rafael
> Sent: Friday, August 03, 2007 10:58 PM
> To: rv7-list@matronics.com
> Subject: RE: RV7-List: Elevator trim rigging
>
>
> Thanks!
>
>
> That makes a lot of sense. It=92s definitely less traumatic than
> removing al that aluminum.
>
>
> I=92ll try it.
>
>
> Regards,
>
>
> Rafael
>
>
> From: owner-rv7-list-server@matronics.com [mailto:owner-rv7-list-
> server@matronics.com] On Behalf Of J. Brunke
> Sent: Friday, August 03, 2007 11:04 PM
> To: rv7-list@matronics.com
> Subject: Re: RV7-List: Elevator trim rigging
>
>
> Dear Rafael,
>
>
> I had the same problem, till a more experienced builder told me to
> put a bend in the threaded rod.
>
>
> It will lift it just slightly and should give you a little more
> breathing room.
>
> Hope that works for you. Sorry I don't have a photo close by to
> send.
>
>
> John Brunke
>
> RV7 in progress
>
> ----- Original Message -----
>
> From: Rafael
>
> To: rv7-list@matronics.com
>
> Sent: Friday, August 03, 2007 6:22 PM
>
> Subject: RV7-List: Elevator trim rigging
>
>
> Hi folks!
>
>
> I would appreciate some help. I=92m trying to rig up the electric
> trim and find that I need to trim away quite a bit of metal to
> eliminate interference for the full down trim.
>
>
> I followed Van=92s instructions regarding the positioning of the trim
> motor mount. As you can see from the pictures, though still within
> the opening footprint,
>
> the actuating rod turned out pretty close to the inboard edge. (I
> thought about centering the mounts at the time, but decided to
> trust the plans.)
>
>
> After installing the trim system, there is a slight miss-alignment,
> but nothing that would cause stress in the system. I made some
> marks on the max, min, and half-way travel of the actuating rod. I
> then adjusted the length for no trim at the half-way point.
>
>
> What worries me most is the amount of metal I have to file out to
> prevent the actuating rod from contacting the elevator under max
> down trim. As you can see, I=92ve already removed quite a bit of
> Aluminum. I hesitate to trim further without some reassurance.
>
>
> Van=92s builder=92s assistance is closed for the weekend, so I thought
> I would seek y=92alls=92 help (I recently moved to Aiken, SC, and I=92m
> learning the local grammar ;))
>
>
> Thanks and best regards,
>
>
> Rafael
>
>
> href="http://www.matronics.com/Navigator?RV7-List">http://
> www.matronics.com/Navigator?RV7-List
> href="http://forums.matronics.com">http://forums.matronics.com
>
>
> http://www.matronics.com/Navigator?RV7-List
> http://forums.matronics.com
>
> ========================
> ========================
>
Message 2
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| Subject: | Elevator trim rigging |
Yep, my RV-7 needs VERY little trim changes through the full speed range.
Mike
RV-7
250 Hours
_____
From: owner-rv7-list-server@matronics.com
[mailto:owner-rv7-list-server@matronics.com] On Behalf Of Dave Cudney
Sent: Wednesday, August 08, 2007 10:49 PM
Subject: Re: RV7-List: Elevator trim rigging
Rafael:
I just got back from a trip and saw your question about the trim travel. I
measured mine today and it is very close to your measurement. I have 20.3
up trim (down movement of the trim tab) and 24.8 down trim (up movement of
the trim tab) for a total of 45.3. As I recall from the last RV that I
flew you use very little of the trim tab to adjust for approach speed and
curse. I see no method of getting more travel without changing the trim
servo. Maybe someone else has a method to get more travel from the servo.
good luck
dave
RV 7A
Starting on the cowling
On Aug 4, 2007, at 7:54 AM, Rafael wrote:
Thanks again, John for your suggestion.
I bent the rod a few degrees and that worked very well. It not only gave me
good clearance, but I was also to correct for the slight miss-alignment.
I now have another question: I measure a trim control of 20.6 degrees up
trim max. and 23.2 degrees down trim max. Van's figures, on section 15:
Flight Controls, call for Maximum up/down of 25-35 degrees. That implies to
me that a minimum travel of 50 degrees is necessary. I'm getting 43.8
degrees, so there's no way to meet these numbers. It's all that the motor
actuator will give.
Any comments as to what's going on?
Thanks and regards,
Rafael
_____
From: owner-rv7-list-server@matronics.com
[mailto:owner-rv7-list-server@matronics.com] On Behalf Of Rafael
Sent: Friday, August 03, 2007 10:58 PM
Subject: RE: RV7-List: Elevator trim rigging
Thanks!
That makes a lot of sense. It's definitely less traumatic than removing al
that aluminum.
I'll try it.
Regards,
Rafael
_____
From: owner-rv7-list-server@matronics.com
[mailto:owner-rv7-list-server@matronics.com] On Behalf Of J. Brunke
Sent: Friday, August 03, 2007 11:04 PM
Subject: Re: RV7-List: Elevator trim rigging
Dear Rafael,
I had the same problem, till a more experienced builder told me to put a
bend in the threaded rod.
It will lift it just slightly and should give you a little more breathing
room.
Hope that works for you. Sorry I don't have a photo close by to send.
John Brunke
RV7 in progress
----- Original Message -----
From: <mailto:rafael@gforcecable.com> Rafael
Sent: Friday, August 03, 2007 6:22 PM
Subject: RV7-List: Elevator trim rigging
Hi folks!
I would appreciate some help. I'm trying to rig up the electric trim and
find that I need to trim away quite a bit of metal to eliminate interference
for the full down trim.
I followed Van's instructions regarding the positioning of the trim motor
mount. As you can see from the pictures, though still within the opening
footprint,
the actuating rod turned out pretty close to the inboard edge. (I thought
about centering the mounts at the time, but decided to trust the plans.)
After installing the trim system, there is a slight miss-alignment, but
nothing that would cause stress in the system. I made some marks on the
max, min, and half-way travel of the actuating rod. I then adjusted the
length for no trim at the half-way point.
What worries me most is the amount of metal I have to file out to prevent
the actuating rod from contacting the elevator under max down trim. As you
can see, I've already removed quite a bit of Aluminum. I hesitate to trim
further without some reassurance.
Van's builder's assistance is closed for the weekend, so I thought I would
seek y'alls' help (I recently moved to Aiken, SC, and I'm learning the local
grammar ;))
Thanks and best regards,
Rafael
href="http://www.matronics.com/Navigator?RV7-List">http://www.matronics.com/
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