Today's Message Index:
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1. 05:48 AM - Re: Adding an electrical system (Robert L. Nuckolls, III)
2. 12:28 PM - Re: Re: Recording a NMEA GPS stream (Peter Pengilly)
Message 1
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| Subject: | Re: Adding an electrical system |
At 11:14 PM 8/21/2012, you wrote:
I am adding an electrical system to a PT-22 per a
customer's request. It will consist of an
overhauled Eclipse Y-150 starter, a RG battery,
starter switch and contactor, a switched bus to
power a Becker radio and transponder, a wind
driven generator, and associated wiring.
Does anyone have experience with adding electrical to a PT-22?
Any gotchas?
I can't find any generator or alternator that is
approved for the PT engine, that's the reason for
the wind generator. It will only produce about 5
amps, so it will barely power the transponder and
slowly recharge the battery and allow occasional radio transmission.
Since I'm doing a form 337 for the change, I
should be able to use any battery. So, we're
considering a PC-680 or a lithium ion battery
such as the Aerovoltz. Otherwise, we'll us a RG-35AXC.
What are your design goals for the installation and
how do you envision it will be used operationally?
Will this airplane be used for cross-country flight?
Is it parked in a location serviced by AC mains power?
Keep in mind that cranking an engine from the
typical battery takes only 5% or so of that
battery's capacity. Transponders take typically
2 amps to operate when generating lots of replies.
If I recall correctly, the Becker was designed
for battery only ops in gliders. It's power
demans are:
Standby" reception mode =A3 70 mA
Reception mode =A3 500 mA
Transmission mode =A3 2.5 A
Energy demands for this instance are trivial.
Further, it has a low voltage warning built
in set to trigger at 10.5 volts.
http://tinyurl.com/9upvqxg
An RG-35 is a beast of a battery . . . 30+
pounds as I recall. B&C did some cranking tests
on the SMALLER cousin to the PC-680 and found
that it would do a 10-blade crank of a high
compression engine (aerobatic aircraft), 5
times in a row (with about a minute cool down
between events). The PC-680 should do better
yet.
How about NO generator, a PC-680 as the only
battery and a Battery Minder plugged in while
the airplane is parked? Li-FePOH batteries
are low risk because you're not going to charge
it at a high rate while airborne . . . and it
can be recharged at a benign rate while hangared.
But take care also that you do not heavily discharge
it between flights as they're more sensitive to
deep cycle damage than their SVLA cousins.
Bob . . .
Message 2
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| Subject: | Re: Recording a NMEA GPS stream |
Cool, thanks!
On 22/08/2012 00:11, Brantel wrote:
>
> I made one of these a while back. Works great!
>
> http://www.vansairforce.com/community/showthread.php?t=84045
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=381485#381485
>
>
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