<s>
The	O
Dornier	B-Device
DO-960	I-Device
was	O
a	O
hybrid	B-Device
computer	I-Device
designed	O
for	O
the	O
Dornier	O
Do	O
31	O
experimental	O
VTOL	O
aircraft	O
.	O
</s>
<s>
Vertical	O
take-off	O
requires	O
solving	O
complex	O
differential	O
equations	O
in	O
real-time	B-General_Concept
.	O
</s>
<s>
Although	O
known	O
primarily	O
for	O
aircraft	O
,	O
Dornier	O
had	O
been	O
building	O
analog	O
and	O
hybrid	B-Device
computers	I-Device
as	O
soon	O
as	O
it	O
started	O
engineering	O
vertical	O
takeoff	O
aircraft	O
.	O
</s>
<s>
The	O
Dornier	B-Device
DO-960	I-Device
was	O
the	O
last	O
known	O
hybrid	B-Device
computer	I-Device
of	O
this	O
series	O
.	O
</s>
