[NSRCA-discussion] Castle software

Wed Aug 13 08:44:49 AKDT 2008

The majority of improvements in the 2.0 vs 1.56 software are for the Helis
and CL governor mode.  Specific to planes, the 2.0 has smoother starts and
lower idle for many motors..and the brake is now silent..no more "ding".
While the 2.0 is an improvement for most motors I've tried it on, it does
not work as well as on my Park 300 (starts rough on the 2.0) and A60-20S and
A60-22S ("screech at ~2000 watts on 2.0, 1.56 is good for 3000+ watts).

A point about using ATV (AFR, flight conditions, etc) to artificially reduce
full power - this is a way to eliminate the "screech", but it is not the
most efficient fix.  My relatively simplistic understanding of the screech
is that it is noise being made by the motor when the ESC loses timing with
the motor.  As power level increases, at some point the capacity of the
motor to absorb EMF will be exceeded, and when it does, the stray EMF
confuses the ESC and the ESC will no longer properly time current pulses to
the motor.  Better software helps, and a brushed sensor would also help (but
this has been abandoned in the interest of fewer parts and simplicity), and
motors with perfectly matched windings, magnet strengths, and good
tolerances help.

Assume a given setup would hit 2000 watts but doesn't because of old
software, un-matched magnets, etc, so the ATV is used to reduce power to
1500 watts.  The ESC is now pulsing the motor to run at 1500 watts, but the
lipo and ESC are still seeing 2000 watts.  It is more efficient to -

- reduce timing

- reduce the prop size to reduce power to 1500 watts and leave the ATV at
"full"

- keep the prop (because you really like that particular prop), and change
to a motor with a lower KV (which will draw less current and turn less RPM)

Doing any of the above will reduce the load on the lipo, which will allow
the lipo to maintain a higher voltage, and that results in a more efficient
system that generates the same power with less heat.

The below link is a general discussion of relevance: 

http://www.castlecreations.com/media/castle_scribe_archives/Castle%20Scribe%
20CE-01-Aug2005.pdf 

So far as wattmeters..many are out there..I've had very good success with
the Eagletree stuff, Astro Wattmeter, and my cheapie Eflite does well.

Regards,

Dave

  _____  

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Richard
Strickland
Sent: Wednesday, August 13, 2008 10:24 AM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] Castle software

Yes-it's a little more versatile with more options (1) is on the OMS with
the A60 and the other is on A Brio with a 5330 F3A.  Since both are recent
additions--C50XLs w/Masters up to this point--I, along with many others
evidently, are experimenting to find the best set-up--but a couple things:
Low timing, 8-15 switching, set end points and backed off to like 70% of
full throttle, run an idle.
Since every airframe is going to have its sweet spot on the right
combination of this stuff and props; there seems to be a lot of trying
involved.

RS

  _____  

From: anthonyr105 at hotmail.com
To: nsrca-discussion at lists.nsrca.org
Date: Wed, 13 Aug 2008 08:27:59 -0400
Subject: [NSRCA-discussion] Castle software

Hi Dave,
  You mention the 1.56 software. Has anyone tried the 2.0?

Anthony

  _____  

From: DaveL322 at comcast.net
To: nsrca-discussion at lists.nsrca.org
Date: Tue, 12 Aug 2008 22:39:15 -0400
Subject: [NSRCA-discussion] A60-20S RE: FW: OMS on E was > older 2m plane
wanted

The A60-20S is about the highest KV practical for pattern (245 KV), but near
ideal for running glow props.  Between the V1 and current V2 versions, I've
probably got about 800 flights.  On 10S, the motor can hit 8000 RPM on an
18.1x10 glow prop.  At the higher RPMs (~7000+), the "E" props don't seem
too happy (amp draw relatively high for the speed and thrust produced).  Run
an 18.1x12 and an 18x12E and the difference is pretty dramatic.

18.1x12 @ 7600 RPM is a very good setup (~70 amps in the air).

19x12E (on a strong lipo) will turn 7000 RPM (borderline on buzzy on the
ground)..and it will pull some current..amps in low 90s on the ground, low
80s in the air.  With good cooling, motor temps won't exceed 150F on a 95F
day.

With the Castle 85HV and 1.56 software on low timing, you won't get a
screech until about 3400 watts.

Regards,

Dave Lockhart

DaveL322 at comcast.net

  _____  

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Richard
Strickland
Sent: Tuesday, August 12, 2008 2:13 PM
To: nsrca-discussion at lists.nsrca.org
Subject: [NSRCA-discussion] FW: OMS on E was > older 2m plane wanted

This might be of a little interest..

RS

This was purpose built E by Orland last year with long fixed gear as an
experiment (OMS stands for Orland McKee Special) with a C50XL Hacker running
on 4200s.  He wasn't nuts about the result and traded it off--was then
converted to the A60.  That guy wasn't crazy about it either(but I don't
think he had it set up right).  Someone was interested in my last IC
airplane(an OMS) and bought it--I had found this could be had the night
before for not too much more than the other--so I turned around and got it
same day--am now totally E.  Had to rework the entire innards to get the
balance right with the 5000s--but I think it will be worth it.  I've felt
all along that these older designs would be good for E and am fortunate to
have come up with this one.

Still learning things like you can put too much power to the larger
out-runners and they can go a little(OK--a lot) nuts (screech) if not set up
properly and there is some experimenting with timing and other stuff that
will increase 'milage' without loss of power--of which there is plenty.
Still motors nicely in vertical up at 65-70%.

RS

  _____  

Date: Tue, 12 Aug 2008 09:26:04 -0700
From: mups1953 at yahoo.com
To: nsrca-discussion at lists.nsrca.org
Subject: Re: [NSRCA-discussion] OMS on E was > older 2m plane wanted

 I would think that landing gear height on an old retract plane would pose a
big problem. Mike

--- On Tue, 8/12/08, brian young <brian_w_young at yahoo.com> wrote:

From: brian young <brian_w_young at yahoo.com>
Subject: Re: [NSRCA-discussion] OMS on E was > older 2m plane wanted
To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org>
Date: Tuesday, August 12, 2008, 10:40 AM

Does it slow down w/ the Electric?

Brian

----- Original Message ----
From: Richard Strickland <pamrich47 at hotmail.com>
To: General pattern discussion <nsrca-discussion at lists.nsrca.org>
Sent: Tuesday, August 12, 2008 9:13:52 AM
Subject: Re: [NSRCA-discussion] older 2m plane wanted

Not quite on subject, but I've been fooling with an electric OMS (pencil
fuse)with a Hacker A60S20, CCHV85 and Tanic 5000s(had to stack them) and man
is this thing easy on batteries!
RS

> From: tschmidt at classicnet.net
> To: nsrca-discussion at lists.nsrca.org
> Date: Mon, 11 Aug 2008 18:59:28 -0500
> Subject: [NSRCA-discussion] older 2m plane wanted
> 
> Hey everyone,
> I have a friend in Wichita Ks that is looking for a "pencil fuse" 2 meter
> pattern ship. He is wanting something like a Storm EX, Patriot, Typhoon,
or
> Pursuit. It has to be in nice condition and set up for retracts. It can be
> just an airframe or ready to fly. He is willing to drive up to 500 miles
to
> pick it up. If anyone has something like this please let me know and I'll
> point him in your direction.
> 
> Thanks,
> Todd Schmidt
> 
> 
> _______________________________________________
> NSRCA-discussion mailing list
> NSRCA-discussion at lists.nsrca.org
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion

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