Okay, I'll weigh in. I am with Frans on this one.
There are various strategies to overcome the risk of electrical dependency.
I am using Bob Knuckles single battery E buss system and I can confirm that
this works.
My Europa took a lightning hit which took out my main electrical system and
I was able to switch over to the E buss and continue flying to the nearest
airport. This system (if maintained) allows me to fly for over 90 minutes.
There are refined, well understood designs for single battery E buss,
single battery dual alternator, or dual battery dual alternator systems.
Redesigning the Rotax fuel delivery system isn't what I would choose to do.
Just my 2 cents worth.
> On 10/10/2013 12:17 AM, Alan Carter wrote:
>
> > Why hasn't the 914 a mechanical pump, as well as an electrical
> > pump. What's the reason not have a mechanical pump in the system,
> > the 912 have both.
>
> The Rotax
> engineers designed the fuel system of the 914 setup such that you can
> keep the fuel pumps outside the cowling, with no mechanical connection
> to the hot engine, and with very little fuel hose exposed inside the
> cowling. Together with the high return flow this ensures that the fuel
> reaching the carbs won't get too hot.
>
> The concept works, I don't remember having seen reports of a double
> electrical fuel pump failure. Don't fix something that isn't broken!
>
>
> Frans
>
>
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