John
I am pleased to hear your system goes so well as I have put mine in the sam
e way except that I used auto connectors for the wires.
I remember your nice set-up well since my visit with my daughter some many
years back!
However I am still slugging away at building!
Rotax 912 UL S arrived during the week.
JR (Bob) Gowing UK Kit 327 in Oz
----- Original Message -----
From: TELEDYNMCS@aol.com
To: europa-list@matronics.com
Sent: Saturday, February 21, 2009 1:08 AM
Subject: Europa-List: Re: Strobe wiring
In a message dated 2/20/2009 3:02:52 A.M. Eastern Standard Time, europa-l
ist@matronics.com writes:
>>>>>I know that this may be a little late for those of you who have al
ready
bought their strobe power units, but my installation works well without
any interference. I have Whelen equipment and I mounted an HTS power
supply at each wing tip. They are mounted on removable panels on the
bottom surface. There is a weight penalty of about 1 pound compared to
a
single HDA power supply in the fuselage but all the high voltage cables
are short and at the tip. No problems.<<<<
Hey John and all,
Follwing the K.I.S.S. principle, I used a single Whelen strobe power supp
ly mounted to one of the vertical baggage bay support members under the por
t side of the baggage bay and my install does not cause any audio interfere
nce whatsoever. Access to the power supply is through the port access cover
in the baggage bay floor. The power supply fires strobes on the wing tips
with the cables routed from the power supply along the bottom side of the b
aggage bay, then along the sides of the baggage bay in the cockpit in fiber
glass raceways which extend from the baggage bay bulkhead forward to the re
ar of the door sill. I installed these raceways along and over the fuselage
seams on the sides of the baggage bay, covering the seam, as well as provi
ding a conduit for wiring. The wires then pass down into the backrest and o
ut the side of the fuselage through grommeted holes in the fuselage sides j
ust behind the spar opening in the side of the fuselage. The raceways I mad
e were molded over a piece of 1.5=22 PVC pipe cut lengthways to produce a 1/3
rd round shape. Then with the PVC taped to a piece of plywood, 3 layers of
'bid were used to make the molding. A 1/2=22 flange was left either side of t
he rounded part to leave a bonding flange for bonding to the inside side of
the fuselage.
My system is quiet as a mouse without the faintest hint of strobe tick. T
he secret to keeping your strobes quiet first and foremost is how you groun
d the shield wires on the strobe high tension feeder cabling. The shield wi
res should be grounded only on the power supply end. I crimped, then solder
ed a ring terminal to the shield wire at the power supply end of the strobe
wires, then landed the ring terminal under one of the mounting screws for
the power supply so that the shield wire has continuity with the power supp
ly case (which is grounded). Do not ground the other end of the shield wire
at the light. If you do, you will create a loop antenna and a host of prob
lems will follow.
I used six pin Molex plugs and sockets at the wing roots and fuselage sid
es so that I would be able to disconnect the strobe and Nav light wiring wh
en the wings are removed. The shield wire must also be carried through at t
his point. At the light end, I simply cut the shield wire off even with the
cable jacket and stuck a piece of heat shrink tubing on the strobe cable t
o make it look pretty, allowing the strobe feeder wires to carry through a
few inches beyond the cable jacket. The strobe feeder wires exit the end of
the heat shrink, along with the NAV wires which are routed on the outside
of the strobe cable, taped to the strobe cabling about every 6=22 along the l
ength of the strobe cable and then carry on to the NAV light. I also instal
led 6 pin Molex plugs at the light to make for easy removal of the light if
and when it fails, but the shield does not need to be included here. The p
lug/socket on the light end makes for easy removal of the light fixture for
replacement of the strobe and NAV bulbs when the time comes or replacement
of the fixture should it become damaged, but this step could be omitted. A
nother thing that is very important is to not route any other wiring with y
our radio and intercom audio wires, especially the strobe feeds and the tri
m motor wiring. Keep all other wiring separated from your audio wires by at
least a few inches.
I've installed Whelen strobe/Nav combo lights, grounding the shield in th
is manner, in 3 different airplanes thus far and all three are/were quiet a
s a mouse.
Hope it helps!
Regards,
John Lawton
Whitwell, TN (TN89)
N245E - Flying
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