I also have a 914 and the Rotax manual shows grouding at both ends. My
manual is three years old though so I don't know if Rotax has changed
this or not.
Erich Trombley
A028
<andy@europa-aircraft.com> writes:
> The most important thing is that you comply with the Rotax
> Installation Manual for anything relating to the engine and its
> installation.
> The reason the Europa manual shows the mag lead shielding earthed at
> both ends is because the Rotax 912 manual shows this. Why there is
> a difference between the 912 and 914, we don't know. If the reson
> is found, I'll let you know.
>
> Best Regards
> Andy Draper
>
> Technical Director
> e-mail andy@europa-aircraft.com
>
>
> >>> Nigel Charles <72016.3721@compuserve.com> 20/02/02 07:46:10 >>>
> Message text written by INTERNET:forum@europaclub.org.uk
> >My 914 manual sez ground the 'mag' wire shields at the engine end
> only.<
>
> Although both ends is advocated by Europa to ensure grounding there
> are two
> good reasons to ground at one end only:
>
> 1. To reduce the risk of interference from ground loops.
> 2. Should another ground between the engine and panel fail if the
> mag lead
> is grounded at both ends an electrical fire could start due to this
> wire
> trying to provide an earth return at much higher currents than it is
> designed for. This has actually happened at least once.
>
> Whilst grounding the mags is important for safety any failure would
> instantly show up at shutdown. Also with Rotax engines the rpm
> needed to
> start the engine is much in excess of that achieved by turning the
> prop
> slowly by hand so the danger is already minimised. With dual
> grounding no
> failure would show up anyway until the second connection fails.
>
> Nigel Charles
> The Europa Forum is supported by Aviators Network UK
> <info@avnet.co.uk>
>
> The Europa Forum is supported by Aviators Network UK
> <info@avnet.co.uk>
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