Redundancy

[Ron Van Putte]

On Jan 24, 2005, at 3:31 PM, Keith Black wrote:

> Amen! Not to mention that the stab servos are REAL easy to setup.
>
> When I was building my first pattern plane I asked about this and got 
> some
> negative feedback on the dual elevator servos. Reason given was due to 
> the
> halves not matching and servos wearing unequally. Well my experience 
> is that
> this hasn't been an issue at all and in fact it was easier to get them
> perfect than with pull-pull.
>
> I use the JR DS3421SA servos in my stab, they are excellent!

I use two Hitec 5625 digital servos on the elevator halves of one 
airplane and two Hitec 5425 digital servos on the other.  With the 
programmable Futaba 9ZAP transmitter and the Hitec digital servo 
programmer, there's not much I can't do in setting up and operating the 
servos.

Ron Van Putte

> ----- Original Message -----
> From: "Ron Van Putte" <vanputte at cox.net>
> To: <discussion at nsrca.org>
> Sent: Monday, January 24, 2005 3:07 PM
> Subject: Redundancy
>
>
>> There's been a lot of discussion about using two battery packs to
>> provide extra capacity and redundancy.  However, as Dean Pappas
>> mentioned earlier, most battery packs fail shorted, so they still
>> provide energy, albeit at reduced voltage and with limited current.
>> However, I have seen many servos fail and their failure mode is 
>> usually
>> "dead at neutral" or "dead hard over".  Neither of these modes of
>> failure is particularly conducive to airplane well being.  Most of us
>> use two aileron servos and having two aileron servos saved two
>> different airplanes of mine.  One servo failed "dead at neutral" and
>> the other "dead hard over".  The first was not a problem.  The second
>> was a struggle, but I got it on the ground safely.  After the second
>> servo failure on aileron, I started using dual elevator servos on all
>> my airplanes.  I haven't had a servo fail on elevator yet, but, if one
>> does, I'll have a fighting chance to get the airplane back on the
>> ground safely.
>>
>> Ron Van Putte
>>
>>
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