Posted by Robin Smith on February 6, 2005, 11:47 am
Anyone know why manufacturers dont use more body panels, especially on the
Prius, to save weight, hence fuel. I understand a number of the Prius panels
are plastic already
I'm guessing its due to strength/safety?
Thanks
Posted by Michael Pardee on February 6, 2005, 3:09 pm
> Anyone know why manufacturers dont use more body panels, especially on the
> Prius, to save weight, hence fuel. I understand a number of the Prius
> panels
> are plastic already
> I'm guessing its due to strength/safety?
> Thanks
I don't know Toyota's reasons, but plastic (actually composite) body panels
have their strengths and weaknesses. They are more resilient than metal,
resisting dents; they never rust; and they are light. They can also be more
expensive to make and are vastly more expensive to repair - usually only
major cities have body shops that can repair composite bodies of the sort
Saturn uses. On the safety side, composites don't contribute to crumple
zones at all - they just don't absorb energy. That makes crumple engineering
in the frame more demanding.
I used to drive a plastic (well, fiberglass) car - a 1969 Lotus Europa. I
sold it to a brother, who made a U-turn too close to the crest of a hill,
and a station wagon came through the passenger door. The bumper of the
station wagon hit the Lotus frame where it ran down the center console and
bent the frame. If there had been a passenger in the seat there would have
been no hope for survival. Modern cars have much better intrusion design,
but you get the idea.
Mike
Posted by Robin Smith on February 7, 2005, 1:39 pm
Yep thx! A pity
rgds
> > Anyone know why manufacturers dont use more body panels, especially on
the
> > Prius, to save weight, hence fuel. I understand a number of the Prius
> > panels
> > are plastic already
> >
> > I'm guessing its due to strength/safety?
> >
> > Thanks
> >
> >
> I don't know Toyota's reasons, but plastic (actually composite) body
panels
> have their strengths and weaknesses. They are more resilient than metal,
> resisting dents; they never rust; and they are light. They can also be
more
> expensive to make and are vastly more expensive to repair - usually only
> major cities have body shops that can repair composite bodies of the sort
> Saturn uses. On the safety side, composites don't contribute to crumple
> zones at all - they just don't absorb energy. That makes crumple
engineering
> in the frame more demanding.
> I used to drive a plastic (well, fiberglass) car - a 1969 Lotus Europa. I
> sold it to a brother, who made a U-turn too close to the crest of a hill,
> and a station wagon came through the passenger door. The bumper of the
> station wagon hit the Lotus frame where it ran down the center console and
> bent the frame. If there had been a passenger in the seat there would have
> been no hope for survival. Modern cars have much better intrusion design,
> but you get the idea.
> Mike
> Prius, to save weight, hence fuel. I understand a number of the Prius
> panels
> are plastic already
> I'm guessing its due to strength/safety?
> Thanks