[NSRCA-discussion] Back to pattern stuff

[David Lockhart]

Just a couple other points of reference -

- My understanding of the aerodynamics of the small plate foamies is that
airflow separation on the control surfaces is more of an issue (no surprise
as the Reynolds numbers are so low) - to the point that it is quite possible
to move the control surfaces too fast - ie, moving them slower would retain
greater authority due to reduce airflow separation.

- I have a Stevens Edge 540 under way - should be covering this weekend.  It
will definitely use the 281s.  At the 2005 NEAT gathering, I loaned a couple
281s to Stevens for their prototype Edge 540 that was being demo'd - the
elev authority increased noticeably.

I've been beating the crap out of a bunch of 281s in 8oz to 18oz planes for
3 years now and never noticed an issue with torque or speed.  They are also
the servo of choice for QQ in his indoor stuff and I've heard him say the
speed is not an issue.  I know the 281s were the first digital servo in that
size range, and still might be the only digital in that size range (too many
servos to keep up with the parkflier explosion).  As with the larger servos,
it does make a difference (that I like).

Regards,

Dave Lockhart
DaveL322 at comcast.net
Team JR

----- Original Message -----
From: "Adam Glatt" <adam.g at sasktel.net>
To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
Sent: Thursday, February 09, 2006 12:18 AM
Subject: Re: [NSRCA-discussion] Back to pattern stuff


> Matt, on the subject of the JR DS281 mini digital servo, I have some
> thoughts.  I bought two of them last summer for a 3Dfoamy.com superXtra
> (1.14m span, layered depron flat shockie, outdoors, 17oz).  I used them
> in rudder and elevator.  I found them to be extremely slow.  This was
> supposed to be an aerobatic and slightly 3D plane, and I wished I had
> installed faster servos.  The airplane flew like crap, so it wasn't a
> good test to evaluate the 281, but I used them enough to figure out that
> they aren't the best.
>
> I'll probably be building a Stevens Aeromodels Edge540 this spring.  It
> will weigh about 2 pounds, and from reading user reviews last fall, JR
> Sport looked to have a servo or two that spec'ed attractively.  I've
> never done a 2-3lb electric, though, so I don't know which servo is best.
>
> -Adam
>
> Rcmaster199 at aol.com wrote:
> > The landing gear will be simple carbon tubing with axles glued in.
> > Planning to use DS281's in the beastie on DaveL's recommendation with
> > the 770 rx
> >
> > The final weight is projected at around 2 1/2 pounds where it should
> > be a fine match for the A30 M16 Hacker motor. A real pocket pattern
model
> >
> > MattK
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