Depending on your particular model, you
may have to move any radio equipment
around within your airframe to clear the
tunnel. In the Extra 260, the rudder tray
was preinstalled to use multiple “pull-pull”
rudder servos, but because of the tunnel
location, I decided to install my rudder servos in the tail and use direct control to
clean up the inside of the airplane.
Before making any modifications, take
notice of any comments regarding balance
and tail heaviness in the instructions of
your model. You can always compromise
and use different servo installations in the
tail for rudder control.
If you want to use different equipment
than what the aircraft manufacturer recommends, modifications are necessary.
Extending a factory-installed exhaust/pipe
tunnel is a fairly easy task and keeping it
sealed from the rest of the fuselage interior
is very important. Don’t be hesitant if you
need to make a change to your aircraft. Just
be sure to think things out ahead of time
and as the old saying goes, “measure twice,
cut once!”
&/5& 3 50%":
"/% 8*/
EFonrtM erortehIenfso:weepstakes at
modelairplanenews.com/
dwubwrow50.dubro.com
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ORIGINAL
KWIK-KLIP
1959
50TH ANNIVERSARY
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Here, the KS 1090 Tuned Pipes have been
installed. As you can see, a heavy-duty spring
holds each pipe in place.
S
1I
9N
5C9E
which could cause the headers to break.
You must be able to access these mounting springs when you need to remove the
exhaust system. I made a removable hatch
on the top of the tunnel. The hatch is ⁄8-
1
inch lite-ply and has 1⁄4-inch square spruce
stock outlining the hatch perimeter. The
hatch cover is secured with four corner
screws. I used 1⁄8-inch lite-ply to cap the
top of the pipe tunnel and the angled rear
portion to deflect air flow outside of the
aircraft. I fuel-proofed the interior of the
tunnel with Pacer Z-Poxy finishing resin.
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POWER BOOST!
Adding a tuned exhaust system (a tuned pipe ) is a great way to add power. Always
remember to install the pipe as indicated in the instructions and be sure to use a tuned-pipe that’s specific to the engine you’re running. With the DA-170 powering my Thunder
Tiger Extra 260, the KS 1090 tuned pipes brought the engine’s top-end RPM from 6000
to 6500. But this is with my relatively new engine. I expect that the power boost will
increase over time as the engine becomes more broken in.
