goods engine sound land orbit speed drag lightweight passengers seater
These
planes
carry
and
cargo
.
Their
is
just
below
the
speed
of
(
350
-
750
MPH
)
.
Their
engine
is
very
powerful
and
they
can
travel
very
quickly
with
many
people
and
.
760
MPH
is
the
speed
of
sound
.
These
planes
can
fly
up
to
five
times
the
speed
of
sound
(
760
-
3500
MPH
)
.
They
have
a
special
and
they
are
designed
with
materials
.
Do
you
know
why
?
To
have
less
.
Most
of
the
early
planes
can
fly
at
100
-
350
MPH
.
Examples
of
this
kind
of
planes
are
the
two
-
and
four
-
passenger
planes
and
seaplanes
that
can
on
water
.
Rockets
fly
at
speeds
5
to
10
times
the
speed
of
sound
(
3500
-
7000
MPH
)
as
they
.
They
have
a
very
powerful
engine
in
order
to
travel
at
this
speed
.