From: "Bobby J. Hughes bhughes@qnsi.net" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: wiring
thread-topic: [FlyRotary] Re: wiring
thread-index: AdQySskj/B87IaAlSaG5bM4wya9Ylw==
Message-ID: <DBD8E19B-2591-4D62-82AF-78387F21E567@qnsi.net>
Date: Sun, 12 Aug 2018 09:43:07 -0500
References: <list-11509176@logan.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
In-Reply-To: <list-11509176@logan.com>

Need more coffee. Fuse holders are a little weak and I ended up with eight b=
reakers.


Sent from my iPad

> On Aug 12, 2018, at 8:38 AM, Bobby J. Hughes bhughes@qnsi.net <flyrotary@l=
ancaironline.net> wrote:
>=20
> Andrew
>=20
> I have several automotive type fuse blocks in plane for secondary items. L=
ights, door alarms, relay coils etc. I notice early the fuse clamping force s=
eemed 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
>=20
> Bobby
>=20
> Sent from my iPad
>=20
>> On Aug 11, 2018, at 8:42 PM, Andrew Martin andrew@martinag.com.au <flyrot=
ary@lancaironline.net> wrote:
>>=20
>>=20
>> Just found the cause of an intermittent problem I've been having. Seems o=
ver the last couple of weeks I thought I had been flooding the engine on sta=
rtup, Well, I had but not from what I thought. For absolute years I've never=
 really had any issue getting the engine to start. but then just as I'm abou=
t to start flying again occasionally it would be impossible to start. turns o=
ut 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 o=
nly ever slightly lower but obvious now at very low amps. and if by luck whe=
n the engine did start it would continue to run( guess due to extra couple o=
f 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 fi=
gure 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 whe=
re the systems join at each component( lots a work) or just put it down as a=
 totally random failure & just check & clean fuse panel connections as part o=
f the annual inspection?
>>=20
>> Andrew
>>=20
>>=20
>>=20
>=20
> --
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