Eiri KY PIK-20 E - Page 45

PIK-20 E Flight manual
A
6. WEIGHT AND BALANCE
6.1 Pre-flight check
Before every flight check that the sailplane is loaded according to the
given weight and C. of G. limitations. Weight and Balance Record sheet
(6.4) gives the empty weight data after the latest change of equipment
or fixed ballast.
Note 1: The sailplane has been weighed with the equipment marked
with "x" in the Equipment List (Service Manual 7.). After changing the
equipment or fixed nose or tail ballast the new actual empty weight and
moment must be determined according to the Service Manual chapter
5.
Note 2: The loading criterias given in 6.1.1. and 6.1.2. have been deter 
mined
so that
— when the C. of G. in flight is on the aft position there is minimum pi 
lot, unusable fuel 0,7 kg, water ballast tanks empty and engine retrac 
ted,
— when the C. of G. in flight is on the fore position there is maximum
pilot, usable fuel 23,2 kg (32 litres) and engine extended
When loading in accordance with these criterias, it is possible to keep
the C. of G. in flight inside the allowable limits by any amount of fuel or
water ballast, the maximum takeoff weight 470 kg shall, however, not
be exceeded.
Allowed water ballast amount is:
m w = 470 kg -m„ -m 0 -m,
where
m w = water ballast (litres)
m p = pilot + parachute (kg)
m 0 = actual empty weight, see Weight and Balance Record 6.4 (kg)
m, = fuel weight (kg) (0,725 x fuel amount in litres)
Note 3: Because the minimum pilot weight is based on the aft C. of G.
in flight, some 20 mm tolerance is recommended to add stability and
convenience during flight, above all during first flights. This equals so
me 8 kg increase to the minimum pilot.
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