any merit in running dual battery packs ?

[Dwayne & Nancy]

Back in the mid 70’s when all were having servo pot centering problems I
took Kraft servo innards and put them in these EK servos.  No more pot
centering problems.  Kraft and others had the pot on the output shaft,
EK’s was on the 3rd gear.  No pot problems.  All most all went to the TI
servo amp in 1972/1973.  Kraft/Proline had external output transistors
while the others had internal.  Same piece of silicon just bonded
different.  Kraft’s could only be purchased via Kraft.  The other could
be purchased from TI.  To get the negative pulse for Proline was just a
bonding change internal to the IC.  EK’s original 3 wire was a discrete
amp.
 
-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of Ed Alt
Sent: Monday, January 24, 2005 10:44 PM
To: discussion at nsrca.org
Subject: Re: any merit in running dual battery packs ?
 
As I recall, the diode bypass for open cells only worked on setups that
used the new-fangled bridge amplifier servo designs, i.e., anything
using the old center tapped 4 wire designs couldn't be saved with the
diode bypass. I could have used it one day on my old Skylark 56 (2nd RC
plane ever for me) with a Kraft Series 70. It did a nice spin-in that
day, though it lost points for shoulder rolling into it as that one cell
coughed its last and all the servos crept over to their final resting
spot. 
 
EK Logictrol had one of the earliest bridge amplifier servos.  My
instructor had one when I got into RC, I think it was late 1969 and he
was already using their little linear rack, 3 wire servos.  I can't
remember the model number for them, but they were really the cats a$$
back then.  I could be wrong, but it might have been EK that first did
the diode bypass in the battery pack. The memory is a bit fuzzy on that
though.
 
Ed
----- Original Message ----- 
From: Bob Richards <mailto:bob at toprudder.com>  
To: discussion at nsrca.org 
Sent: Monday, January 24, 2005 3:25 PM
Subject: RE: any merit in running dual battery packs ?
 
Dean,
 
I did not know Orbit did that. I know Proline did. I loved those
Competition single-stick radios.
 
Bob R.

Dean Pappas <d.pappas at kodeos.com> wrote:
Hi Ron,
Nickel tends to fail short. That's actually good. Once upon a time,
Orbit sold its packs with diodes across each cell to protect against
failed-open cells.
 Try the Smart-Fly BATshare ... same bat time, same bat channel!
http://www.smart-fly.com/Products/BatShare/batshare.htm
 
later,
    Dean
Dean Pappas 
Sr. Design Engineer 
Kodeos Communications 
111 Corporate Blvd. 
South Plainfield, N.J. 07080 
(908) 222-7817 phone 
(908) 222-2392 fax 
d.pappas at kodeos.com 
 
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