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The twin rotor HTM Skytrac was a
little work helicopter fitted with a flat six engine. It found
its origins in the early sixties from one of five Alfred Vogt's
design at the Helicopter Technik Wagner which later became
Helicopter Technik München ( HTM ). From first project with a
pod-shaped body fitted with a 95 rotary engine and a skid
undercarriage derived the torqueless Skytrac having a chassis
frame carrying engine and a twin contra-rotative rotor system to
which a variety of cabins and equipment can be fulfilled for
various roles. First proto was single seat tailess Skytrac 1 D-HAJE,
second was the three-seater Skytrac 3 D-HAJI, all two appearing
at the 1966 Hanover Air Show. They were powered by Franklin 95 hp
piston-engines.
This machine D-HARB, it appeared on the German Register as
Skytrac 1 C/n 12 in 1972 and disappeared in 1976, surely
consistute a quite more sophisticated version having now a strong
beam supporting a completely redesigned all-vision single-seat
cabin with rear enclosed engine, now a six cylinders Lycoming 0-540
of 305 hp and a low rotorless tailboom with a V tail. In its
agricultural role, it seems that the contrarotative rotor gave a
neatly better spraying of chemicals. It embodies two tanks of a
total chemicals capacity of 480 liters installed symetric outside
the skid undercarriage and a 12 meter wide spray ramp (same
diameter as the twin-rotor) with 26 holes receiving 24 different
types of sprayers device according the nature of chemicals etc.
Flow was from 3 to 210 liters by minute giving an efficiency of 6
to 260 liters by hectare.
Price of the helo was then 213,000 Deutsche Mark and it was
necessary to add some 3000 to 4000 marks for spray or dispersion
equipment and naturally 1800 extra marks for the two chemical
tanks. Do the addition!!!
