From: "Bobby J. Hughes bhughes@qnsi.net" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] wiring
thread-topic: [FlyRotary] wiring
thread-index: AdQyQayFlHoXMDVARkOYDySg6em90Q==
Message-ID: <01231D3E-87AD-411E-8E48-B6767A9D73C4@qnsi.net>
Date: Sun, 12 Aug 2018 08:37:54 -0500
References: <list-11508290@logan.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
In-Reply-To: <list-11508290@logan.com>

Andrew

I have several automotive type fuse blocks in plane for secondary items. Lig=
hts, door alarms, relay coils etc. I notice early the fuse clamping force se=
emed a little week on some slots. I ended up with pull type breakers for EC,=
 coils and injectors fuel pump. Also all fuse blocks are feed from breakers.=
  Secondary power for EC and secondary fuel pump are also on fuses. I think I=
 needed up with eight breakers and three fuse blocks.=20

Bobby

Sent from my iPad

> On Aug 11, 2018, at 8:42 PM, Andrew Martin andrew@martinag.com.au <flyrota=
ry@lancaironline.net> wrote:
>=20
>=20
> Just found the cause of an intermittent problem I've been having. Seems ov=
er the last couple of weeks I thought I had been flooding the engine on star=
tup, Well, I had but not from what I thought. For absolute years I've never r=
eally had any issue getting the engine to start. but then just as I'm about t=
o start flying again occasionally it would be impossible to start. turns out=
 the ignition fuse was acting like a resistor.
> Was hard to diagnose as just touching the fuse made it work so every time I=
 put the multimeter on it it would show as ok, and volts at the coils was on=
ly ever slightly lower but obvious now at very low amps. and if by luck when=
 the engine did start it would continue to run( guess due to extra couple of=
 volts from alternator) so no inflight failure, but would only have been a m=
atter of time.
>=20
> Anyway now when I should be right in my test phase, I'm back trying to fig=
ure out if I need a redundant power supply for the engine. hard because of t=
he type of failure and there are so many single point failures possible its k=
ind of pointless trying to mitigate them all.
>=20
> The problem area was the contact surface between fuse & fuse holder, Not s=
ure if I got a dodgy fuse block or if its just the environment.=20
> So do I duplicate the engine power bus, switches & wiring with diodes wher=
e the systems join at each component( lots a work) or just put it down as a t=
otally random failure & just check & clean fuse panel connections as part of=
 the annual inspection?
>=20
> Andrew
>=20
>=20
>=20