Pipistrel Sinus 503 User Manual

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SINUS motorglider
www.pipistrel.si
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89
SINUS motorglider
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REV. 0
Appendix
Aircraft familiarisation
This chapter has been written to assist owners/pilots of Sinus ultralight motorglider on their quest to learn
how to safely and eciently y this aircraft. It will cover most operations the aircraft can oer in an order
established in Pilot and maintenance manual’s chapter Normal procedures and recommended speeds.
Please consider what follows as an add-on to that chapter.
I am quite convinced that even experienced Sinus ultralight motorglider pilots will discover something
new browsing through the following passages.
Tine Tomazic
Engine start-up
First and foremost make sure you have sucient fuel quantity on board for the desired length of
ight. If you are not completely condent there is enough, better step out of the aircraft and add a
couple more liters into the tanks. There is an old aviators’ saying: “The only time you have too much
fuel is when you are on re.”
When pressing the engine starter button, wheel brakes MUST be engaged. The aircraft is not to
move before you receive your taxi clearance. To keep your propeller untouched, avoid starting up on
areas where there are small stones on the ground. Those little stones can easily be picked up by the
propellers causing marks and even little holes on it.
Warming up must be conducted below 3500 RPM for 2-stroke engines, that is 2500 RPM for 4-
stroke engines. When reaching safe operational engine temperatures, it is time to verify maximum
engine ground RPM. Hold the stick back completely and slowly(!) add throttle to full power, then
verify RPM.
Taxi
Taxiing with the Sinus ultralight motorglider is rather simple considering the stearable tail wheel. For
sharper turns on the ground you can also use wheel brakes to assist yourself. I would recommend
you taxi slow, up to 10 km/s (5 kts). Sinus ultralight motorglider’s long wings cause quite a bit of iner-
tia if turning too quickly on the ground. Ground loops are virtually unknown to Sinus ultralight mo-
torglider pilots, but pilots with little or no tail-dragger experience, who attempt to taxi fast (20 - 30
km/h, 10 - 15 kts) are still subject to ground looping. Fortunately, due to the stearable tail wheel, this
is not dangerous for aircraft’s structure. You will recognise the beginning of a ground loop by seeing
the aircraft rapidly increase its angular velocity while turning on ground.
To prevent ground looping simply apply full opposite rudder and both wheel brakes while hold-
ing the stick back fully.
Ground visibility is what makes pilots wonder how they will safely move around. To see forward
simply lean your head and press it against the window. This will provide you with straight-forward
visibility.
During taxiing monitor engine temperatures. Due to low airow around the radiators the CHT and
Oil temperature will rise during long taxi periods. If you are holding position, do not leave throttle at
idle. It is better you have some 2500 RPM as this will provide some airow from the propeller to the
radiators and the temperatures will not rise so quickly. Should you see engine temperatures exceed
safe operational values, shut o the engine, point the aircraft’s note against the wind and wait
for the temperatures to drop.

Pipistrel Sinus 503 Specifications

General

Brand	Pipistrel
Model	Sinus 503
Category	Aircrafts
Language	English