Alan, I work on the assumption that if I keep my Odyssey
battery in good nick and replace it before it dies then I
should have a significant proportion of the nominal17 amp
hrs available when/if the rectifier packs up. The Rotax
maintenance manual gives the current demands of the pump
as 2 amps at lower pressures rising to 3 at highest
pressure. With the ammeter fitted to my plane I can
readily see what usage I have as I switch off inessential
items. As I remember it when my rectifier packed up over
the North Sea the fuel pump took something nearer 2 amps
than 3 with radio on as well.
I wouldn't rely on being able to fly for lots of
hours over sea but would be pretty comfortable about
flying a few hours over land to get home, rather than put
down somewhere totally inconvenient and get stuck until a
new rectifier arrived. For glider pilots this is after
all, the normal modus operandi, and you get to be fairly
relaxed about popping it into a field if your means of
staying airborne disappears!
Regards, David Joyce, G-XSDJ
"Alan Carter" <alancarteresq@onetel.net> wrote:
><alancarteresq@onetel.net>
>
> Hi David.
> You have flown to some wonderful places, Im UK only no
>longer have that confidence, when i was in my 20s yes I
>would have.
> Im no expert on the plane never looked into it, but all
>the planes I have flown the engine is entirely separate
>from the aircrafts electrics and you have just confirmed
>that with Master off and Alternator off and the a pump
>and spark keeps the engine going, or should do.
> So the spark is not influenced by either switch,
> and the pump get it power from either a separate circuit
>within the Alternator or the battery which will slowly
>run down.
> Rotax must say somewhere how long you have on battery
>and pump only.
> or maybe not?
> We know with the Master and Alternator off the engine
>will run OK.
> But with a serviceable system how do I check its failure
>capabilities ??
>
> Regards
> Alan
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=410354#410354
>
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