Today's Message Index:
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1. 01:39 AM - Re: AC powered fin strobe (R Holder)
2. 01:54 AM - Re: off topic interesting incident (ptag.dev@tiscali.co.uk)
3. 06:25 AM - Re: AC powered fin strobe (Frans Veldman)
Message 1
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Subject: | Re: AC powered fin strobe |
On 10/12/2011 06:12, Richard Lamprey wrote:
> My fin mounted 12V DC Filser strobe went u/s, and I
> have spent some time looking for a similar strobe that
> will fit in the hole in the fin (5 cm exact diameter).
> I settled on the Illusion strobe from the US (mostly
> used for ultralights), the only one that will fit, and
> this is powered directly from the Rotax 912 magneto
> generator, which supplies 12V AC. I am told it has an
> exceptionally bright flas. The strobe power box is
> wired in series between the 912 generator wires
> (yellow) and the Ducati voltage rectifier. Also,
> strangely, there is no circuit breaker or fuse in this
> system. Has anyone installed an Illusion AC system
> before, or similar? Are there problems, does it blow
> the rectifier? The supplier assures me this is a
> common installation with 912 engines, and there are no
> problems.
Be advised that the AC voltage out of the stator can be as
much as 30 v at full power.
That might explain why it is so bright.
Unless you really meant "in series" rather than the usual
"in parallel" !
If it works in series then it might be OK with a slightly
higher engine rpm before the battery gets charge.
RFWH
Message 2
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Subject: | off topic interesting incident |
Hi! Will
suggeswt you get a lottery ticket !
Merry Christmas and Happy New Year
Regards
Bob Harrison G-PTAG
>----Original Message----
>From: craigb@onthenet.com.au
>Date: 09/12/2011 23:57
>To: <europa-list@matronics.com>
>Subj: RE: Europa-List: off topic interesting incident
>
>Ouch, lucky to get away with that one
>
>
>
>From: owner-europa-list-server@matronics.com
>[mailto:owner-europa-list-server@matronics.com] On Behalf Of William
Daniell
>Sent: Saturday, December 10, 2011 6:20 AM
>To: europa-list@matronics.com
>Subject: Europa-List: off topic interesting incident
>
>
>
>All
>
>
>
>I attach a foto of one of our club pa28 taken yesterday. Have a look
at the
>wing.
>
>
>
>The aircraft hit a tree in the approach to Bogota in a place called
Bojaca
>from the south west - you can find it on google maps. In addition
the
>aircraft has a big dent on the spinner and lost an main gear leg.
>
>
>
>It appears that the aircraft was descending through a hole in the
cloud over
>bojaca and accidentally came up against a mountain of which there are
lots
>in Colombia. The aircraft hit a tree making the substantial hole in
the
>left wing loosing the fuel tank and main gear leg. The pilot as soon
as he
>saw the tree applied full power and had the presence of mind to
switch
>tanks.
>
>
>
>Now here is the remarkable thing. The aircraft bounced off the top of
the
>tree and flew in this state to our base in Guaymaral SKGY which is
about 15
>minutes flying time and landed coming to rest obviously on the left
wing.
>Not a mark on the prop.
>
>
>
>Will
>
>
>
>
>
>
Message 3
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Subject: | Re: AC powered fin strobe |
On 12/10/2011 07:12 AM, Richard Lamprey wrote:
> The
> strobe power box is wired in series between the 912 generator wires
> (yellow) and the Ducati voltage rectifier.
Wait a minute. Is it really in series? If both yellow wires go to the
Ducati AND both go to the strobe, it is parallel. If one yellow wire
goes to the strobe, and one yellow wire to the ducati, and a new wire is
used to connect the remaining ducati and strobe connectors together
(like how X-mas tree lights are wired), it is indeed series.
It is quite important to know whether it is parallel or series, hence my
question.
> Also, strangely, there is
> no circuit breaker or fuse in this system.
This would make sense if it is series indeed, otherwise you should use a
fuse.
Anyway, I would advise for quite a number of reasons against a series
diagram, but a parallel diagram would be ok. I would be surprised if it
is series indeed, but you never know.
Assuming it is parallel, as it should be, I think it is a great
solution. Strobes work on high voltages, so any strobe power supply
needs to convert the low voltage DC into high voltage AC and then
rectify it again. By feeding it directly from the alternator (where it
is still AC) quite some losses can be avoided, and it also does not load
the Ducati (which has a tendency to burn out easily). An AC-fed strobe
can not be powered from the battery, but if the alternator fails the
strobe is the first thing you should power down anyway, so this is no
real disadvantage.
You should put a fuse between the alternator and strobe power unit.
(Don't use a CB here, as you should never try to reset a tripped strobe
CB during flight: it is not essential equipment and malfunctioning
strobe power supplies are quite a hazard, so don't play with these
things and just use a "one-time" fuse here to avoid any temptation!). I
would put a switch in between too, as it is considered somewhat impolite
to wait at the holding point with bright flashing strobes while there is
someone on final, especially when it isn't very bright weather. I would
also like to power down the strobe if I would smell any fuel during flight.
Frans
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