SCHEMPP-HIRTH FLUGZEUGBAU GmbH., KIRCHHEIM/TECK
Arcus M
FLIGHT MANUAL
Extending the prop, starting the engine in flight
1. With the prop extended and engine off, the rate of descent is approx.
2.25 m/s (443 fpm) at a speed of 105 km/h (57 kt, 65 mph), resulting in
a glide ratio of only about 13 : 1 – contrary to the best L/D of 49 : 1 in clean
configuration (prop retracted).
Therefore the engine should only be restarted over terrain suitable for an off-
field landing and that, if possible, n o t below 300 m (984 ft) AGL.
But extending the prop to restart the engine at a height of 200 m (656 ft) AGL
on the down-wind leg to a suitable landing field is safer then e.g. restarting it at
500 m (1640 ft) AGL above a forest or the like.
Should a flight be planned over long distance without any acceptable landing
fields, the prop should be extended at a height giving sufficient time for all
emergency procedures and, if necessary, for re-retracting the propeller.
2. Starting procedures - see also check list on page 4.5.1.5
The loss of height from extending the propeller to the moment the engine
is running is about 40 to 50 m (131-164 ft) and needs 35 to 45 seconds.
October
2011
Revision --
appr. 4.5.3.9
