Electric Pattern

[RC Steve Sterling]

Great info-- thanks. Lithiums have not been famous for high current/fast
discharge. Obviously, technology is improving. 15-20 minute flight times is
amazing.

-----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On Behalf Of gwright
Sent: Tuesday, August 05, 2003 6:52 PM
To: discussion at nsrca.org
Subject: RE: Electric Pattern


Its a hacker C50 acro motor, I think they finalized on the 13 turn motor.
It's geared 6.7 to one, and he's using 10 series, 3 parallel thunder power
lithium polymer batteries. That comes to 42 volts unloaded, the fai max I
believe, and at 68 amps at full throttle it's about 34 volts, or equivalent
to 35 or so nicad/nimh at that level. Total capacity is 6150mah and flight
time is about 20 minutes. At first, 4-parallel were being used, but since
close to 1/2 hour flights weren't really needed <G>, they went down to 3
parallel and tested to see that the packs could handle the loading, which
they can. full throttle is 2300 watts, which equates to a bit over 3
horsepower, but with the larg prop, thrust is far better than you get with a
lot more horsepower with a "little" 18 inch prop.  Lots of research went
into this, and a couple of us have been testing the C50 motors for almost a
year (I flew one of the originals in my funtana at the TOC demos). I'm using
the thunder powers in most everything, so 20 to 30 minute flight times with
my 3D planes is common (some are 48" span, "40 size", and some are 80~88
inch span, so they're not little parkflyers).

-----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On Behalf Of Henderson,Eric
Sent: Tuesday, August 05, 2003 9:23 PM
To: discussion at nsrca.org
Subject: Electric Pattern


I would be most interested in which  cells being used and which Hacker. I
have a fairly capable electric pattern but it only lasts 5 minutes on 20
cells..

Also charging of the li-poly's? is not known to me etc..

Eric.



-----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On Behalf Of Zapata, Lisandro
Sent: Tuesday, August 05, 2003 5:40 PM
To: 'discussion at nsrca.org'
Subject: RE: Poland - electrics


Who said that electric technology is not proven:
check Jason 'fliying silent'
http://www.rccraze.com/newpattern.mpg

What I see is more than enough power. which is what mater for power plant.
Arturo

-----Original Message-----
From: juhler at bellsouth.net [mailto:juhler at bellsouth.net]
Sent: Tuesday, August 05, 2003 3:49 PM
To: discussion at nsrca.org
Subject: re: Poland - electrics


Dave,

Yes.  They are there cause how well they flew.  What I am saying is, I think
it is wrong for them to use proven method's to get to the show, then switch
out equipment to highlight a new technology or to meet sponsor needs after
getting there.

I guess basically what I am saying, is; it is not fair to the guys they beat
out by using their normal equipment, then risking a poor showing at the
world to display new technology.  If the new technology is such a good idea,
and will not hurt them performance wise, then use it to get to the worlds,
not just at the worlds.

Just my opinion.

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