2017.02.22

Hello Paul,

hm, the translation of the papers, I've sent to you, will be a lot of work
...

So, I'll start with the smallest one - about the RFB history ...

The text is written by Hanno Fischer. He was the technical director at RFB.

1st picture > Sirius 2
A glider with 2 seats, equipped with 2 Fichtel + Sachs RE, 30 hp each,
driving an integrated fan.
Predecessor was the Sirius-1, driven bei two 20 hp F+S rotaries.

RW 3 M ...
Mr Fischer keeps the RW 3 "ready to takeoff", because it's a pretty special
airplane (first use of GFK, first registration of a german airplane in the
USA ...).
It is equipped with a NSU KKM 871, Mr Fischer has taken from the contingent
of the Fantrainer engines. Lift off power is 150 hp, transmitted to 2 half
integrated fans by 2 toothed belts. The wings are acting as noise reduction
shields - gain is 12 dBA. On "fly over" only 56 dBA was measured. You can
hear the airplane not until it's nearer than 200 m. So Mr Fischer don't has
to pay any charge for landing at Moenchengladbach.

The NSU Wankel engines were ideal to drive aircrafts. They had double
ignition, small dimensions, little vibrations, you can use "Normal" fuel +
there was a mixture correction switch for lean / rich adjustment.
Unfortunately NSU (Audi) has stopped the production.

Fantrainer
Properties of flight were near to those of a jet. The german airforce has
needed a replacement of the obsolete Piaggio Trainer. The Fantrainer AWI 2
was developed in order of the ministry of defense.
A = Trainer for Beginners
W = Wankel engine
2 = 2 seats
2 KKM 871 were coupled by a gearbox made by Kloeckner - with one way clutch.
It was an airplane with two engines, but acting like one with 1 engine only.
All requirements have been achieved.
After NSU (Audi) has stopped the production of the RE RFB has switched to
turbines by Allison with 400 + 600 hp.
Performance of the Fantrainer was better than that of a Beech or a Pilatus.
But the german airforce has transferred the education / training of their
new pilots to the USA.
48 Fantrainer equipped with turbines were sold to the Royal Thai Airforce.

Fanliner
The aircraft is based on patents by Hanno Fischer + parts by Grumman.
Fanliner 1 was developed in cooperation with Grumman, USA, using the "carry
unit" + the tail unit of the "Yankee". Power plant was a marine version of
the NSU RE with 110 hp (~ Ro 80 engnine). After the announcement of the KKM
871 RFB has started to develope the Fanliner-2. The bigger cabin was
designed by Colani, carry + tail units were deliverd by Grumman again.
The Fanliner has proved with higher speed + more powerful climbing abilities
than the Grumman Traveller. The reduction gearbox was made by Kloeckner
Humboldt Deutz + the Fanliner was classified as a low noise airplane.

Than the production was stopped by NSU (RE) + Grumman (Traveller).

The first steps ...
Ordered by the department of defense RFB has done R+D of fast running fans.
They had used 3 + 4 rotor engines delivered by Daimler-Benz. Thrust + the
small form factor have been ok, but the power plants had produced too much
noise with high frequencies. Tests were done in the wind tunnel of Stuttgart
with up to 400 hp.

Puuh - that was text one. For translation of the other papers I will need
more time + I will look at some parts of the texts only. Please, be patient
with me ... ;-)

With kindest regards

Franky / Frank Herfert

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