|JT-6 Technical Page|
The installed instruments are: air speed indicator, altimeter, a
mechanical rate of climb indicator, a Ball electric vario, tachometer,
EGT gauge, fuel quantity gauge, battery voltage gauge, bank indicator,
magnetic compass plus 720 ch Dittel radio with head set. The bright
white spot on the left side of the instrument console is a mirror to
see the prop position for retraction into the fuselage. I also have a
Garmin 90 GPS fitted to the canopy frame with a cable to the plane
The cockpit is
crowded for the pilot. There are two cranks, one for the flaps on the
left side and another for the engine retraction on the right side. I am
a bit worried about of how to bail out in an emergency. Other possible
hazards include a lead acid battery in the nose (in front of rudder
pedals) and the fuel tank as the pilot back rest. Well, similar
arrangement can be seen in many ultralight airplanes and it also was
adapted for the type certificated serial production model PIK-20E.
However, in the latter, the tank is of crash resistant kevlar fiber
whereas in my JT-6 it is of brittle fiberglass.
very handy feature proved to be a radio frequency table on top of the
instrument panel. All southern Finland TWR, APP, ACC and METEO
frequencies are included|
JT-6 engine installation.
The first engine tested, the 33 hp Canadian Kohler
, determined the
engine compartment size for the JT-6. This created a problem when
fitting the larger 45 hp Rotax 502. The engine compartment opening is
only 28 cm wide, allowing no space to fit normal cylinder cooling air
baffles. I solved the problem with a unique arrangement of a folding
plate (0.5 mm 2024 aluminium sheet) with two piano hinges. When the
engine is retracted, the cooling plate is pressed agaist the cylinder
fins (red arrow in the picture below). Heavy tape was added to the
aluminium sheet to prevent vibration and cracking.
Several exhaust mufflers were tested with the Kohler and Rotax engines
until the final one was well tuned for good power with low weight. I
also carved several propellers of laminated birch. The finishing is of
fiberglass/epoxy covering with epoxy paint.
|Landing gear additions.
Originally I designed wing mounted retractable outrigger wheels for the
JT-6. They were operated together with the flaps and were basically OK
except that the flap mechanism inside the wing did not tolerate the
high loads generated if the outrigger wheels hit an obstacle on
landing. After about five years of flying I replaced the outrigger
wheels with wing tip wheels adding tie down brackets as well. The tail
wheel is steerable with a steel spring arrangement between rudder and
the tail wheel fork.|
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