Sailplane Construction Project Session #159
The picture below shows the
integrated ignition unit
consisting of (1) a 750 mAH NiMH battery pack,
(2) a ModelElectric coil, and (3) Marv Stern's Aero Tech IGN-SW ignition
module installed on the back side of the Sailplane's firewall
with two 2-56 cap screws. You can see the (+) ignition pack charge terminal
and the (+) booster terminal wires with lugs soldered to their ends. In
addition, the landing gear has also been installed.
With the two wire lugs attached to the terminals
on the back side of the hatch cover, this picture shows the two external
terminals and the hook up for charging the ignition pack and attaching
external booster batteries (note
that the landing gear wire is grounded to the engine).
The green wire in the picture below is the
landing gear's ground wire to the engine for the booster and ignition pack
charge grounds on the landing gear shown above. I was doing a continuity
check with the multimeter that you see in the picture.
This picture shows the ignition unit's ground and
point wires. Notice that the high tension lead is too short to be routed up
through the cowl and to the spark plug.
So I started making a new high tension
lead. Larry Davidson sells the clip shown below that snaps onto the coil
post. Years ago Dick Huang gave me bunch of very small aluminum brads that I
use to attach the high tension wire to the coil clip. About a 1/4" of the
insulation on the high tension wire is removed and the stranded wire is bent
through the hole in the coil clip. The aluminum brad is also pushed through
the hole and then flared out, which attaches the high tension wire to the
coil clip. Black heat shrink tubing is used insulate the connection as shown
James Lollar is sending me some 1K and 10K
resistors to use inline with the little spark plug clip that I make, but
they have not arrived yet. I will probably use a 10K resistor and locate it
as close to the spark plug as practical. Well, that's it for
Click Here to go to the
next page (160)....