[NSRCA-discussion] Servos suggestions for a 90 size patternplane

[Dave]

A lot of good points made in this thread.

The actual load a servo experiences can be substantially higher in seemingly
equal planes because -
- the control surface weighs more
- the surface deflects further
- less servo travel is being used to give equal surface deflection
- more vibration (different motors, different props, different mounts, etc)

When a servo works well in one plane (but is close to it's limits), small
differences in the details may cause it to not work well in another plane.

I think something that is often overlooked (and I don't think mentioned in
this thread yet) is this - the aileron servos are working hardest when at
neutral when the plane is changing in pitch.  The differential pressure as
the wing generates lift tries to pull the ailerons off center.  If they do
not hold position equally, you get unwanted roll, and the airplane becomes
very difficult and unsettled in loop tracking.  This can happen with
absolutely no hint of lack of aileron servo torque in rolling maneuvers.

I prefer to know I have enough servo power, and know the servo is "loafing"
and running efficiently, compared to being near it's limit and being
stressed.

Regards,

Dave


 
-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Jon Lowe
Sent: Friday, June 12, 2009 7:45 PM
To: nsrca-discussion at lists.nsrca.org
Subject: Re: [NSRCA-discussion] Servos suggestions for a 90 size
patternplane

Don't try metal geared 3421's on a fuel airplane on ailerons.  Stripped 
them out, in flight, after less than half a season. The constant 
vibration killed the tiny, fine toothed gears.  I wouldn't use metal 
geared 3421's on elevators either.  I regularly use 3421SAs on 
elevators without an issue.


Jon Lowe


-----Original Message-----
From: mike mueller <mups1953 at yahoo.com>
To: General pattern discussion <nsrca-discussion at lists.nsrca.org>
Sent: Fri, Jun 12, 2009 9:24 am
Subject: Re: [NSRCA-discussion] Servos suggestions for a 90 size 
pattern plane











  Tommy I worried about the 3421's until I looked at the size servo's 
that QQ was
running on his Euphoria. He runs dual ailerons on 1 small servo. I'm 
running
3421 metals on my ailerons on my new Sickle so far so good. It was 
because of
weight and also because I really think an E. plane can get away with 
less servo.
I run it on a 6volt regulated 2 cell lipo. I think everyone is in to 
the
security that overkill allows and that's great if your not worried 
about the
weight. Mike

--- On Fri, 6/12/09, Tommy Scarmardo <tretas513 at yahoo.com> wrote:

> From: Tommy Scarmardo <tretas513 at yahoo.com>
> Subject: Re: [NSRCA-discussion] Servos suggestions for a 90 size 
pattern plane
> To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org>
> Date: Friday, June 12, 2009, 9:13 AM
> The 3421sa's are great little0D
> servos, I have two on elevator on my new ship, but you
> should be careful where you use them. The motor is
> stronger than the nylon gear
> train and is easily stripped under certain conditions.
> The gears are tiny.
>  
> tommy s
>
> --- On Fri, 6/12/09, mike mueller
> <mups1953 at yahoo.com> wrote:
>
>
> From: mike mueller <mups1953 at yahoo.com>
> Subject: Re: [NSRCA-discussion] Servos suggestions for a 90
> size pattern plane
> To: "General pattern discussion"
> <nsrca-discussion at lists.nsrca.org>
> Date: Friday, June 12, 2009, 7:47 AM
>
>
>
> How about JR 3421SA on everything but the rudder which
> would work well with a JR 8321. Mike
>
> --- On Fri, 6/12/09, Dean & Melissa Williams <DMWILLIAMS at bigpond.com>
> wrote:
>
> > From: Dean & Melissa Williams <DMWILLIAMS at bigpond.com>
> > Subject: [NSRCA-discussion] Servos suggestions for a
> 90 size pattern plane
> > To: nsrca-discussion at lists.nsrca.org
> > Date: Friday, June 12, 2009, 7:40 AM
> >
> >
> > 
> > 
> >
> >
> > 
> > Hi
> > Which servos
>  (brand and #)
> > would you use for a 90
> > size pattern plane like the ESM Adrenaline 90 and
> which
> > ones on what surfaces
> > ?
> > Thanking you for your
> > sugestions
> >
>                                    
          
> >
> > Dean (Outback OZ)
> >
> > -----Inline Attachment Follows-----
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> > NSRCA-discussion at lists.nsrca.org
> > http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>
>
>      
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