| Summary: | Sitting position and weight can affect the motorcycle passenger comfort
and safety while tandem. Some rules driving the motorcycle in Indonesia, where
the position of the right passenger seat is facing forward, not sideways. When
judged from the centre of gravity (COG) motorcycle passengers sit facing forward
have different COG by COG passengers sit sideways because of changes in
posture. Built on the background of this research will be analysed how much of a
shift in the COG passengers sit facing forward when compared with the passenger
sitting sideways. The aim of the study is to identify shift points against cog
passenger sitting sideways sit facing forward and rear-side view. In addition, the
relationship of body mass index (BMI) of passengers on a passenger's body COG
shifts will be discussed in this study.
The method employed to analyse the shift of the COG is the passenger's
body segmental method. Graphic design software is used to determine the
coordinates of the body COG passengers sit facing forward and sitting sideways,
side view and a back view of the results of a two dimensional photograph.
Statistical software is used for data processing. In this study, 45 women with
different BMI classifications are each 15 respondents for BMI thin, normal and
obese as sample. The study sample aged 21.5+1.8 years with a height of
156.9+4.3 cm and weight 52.3+9.6 kg. Normality test and the test of significance
was used to analyse the data and look at the shift between the coordinates of the
body COG passenger XTSD (X appears next to the front), YTSD (Y side view front),
XTBD (X rear-front) and YTBD (Y looks behind the front) to sit facing forward and
XTSM (X looked sideways sideways), YTSM (Y looked sideways sideways), XTBM
(X rear sideways) and YTBM (Y rear sideways) to sit sideways.
From the research, we concluded that the horizontal COG body passenger
side view sitting sideways shift of 1.66cm and was significantly different (p
<0.05) in the direction of the rider. COG horizontal body rear passenger is sitting
sideways shift -3.03 cm and was significantly different (P <0.05) towards the
passenger sitting sideways view of the body COG passengers sits facing forward -
0.53 cm. COG shift gives effect to motorists and passengers who require more
effort and concentration to keep the balance of the motorcycle when the vehicle is
turning and passing speed bump. BMI passengers no significant effect on body
COG shift of passengers, both for passengers sit facing forward and sitting
sideways looks aside and looked back.
Keywords: sit facing forward, sitting sideways, center of gravity,
segmental method.
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