STEMME S12 User Manual

DOCUMENT NUMBER:
L500-912.820 ISSUE JUL 20, 2016
AMENDMENT: 00
DATE: 
CHAPTERPAGE 311
MAINTENANCE MANUAL STEMME S12
3.4 POWERPLANT
3.4.1 ENGINE
Engine description See Maintenance Manual (Heavy Maintenance)
for ROTAX Engine Types ROTAX 912 and 914
Series, section 71.
Upper (rear) Engine Attachment
A tubular steel frame at the upper engine anges,
mounted in two vibration absorbing elements
in the upper lateral tube of the fuselage frame.
Lower (front) Engine Attachment
A separate tubular steel frame at the lower
engine flanges in two vibration absorbing
elements in the forward lateral framework
junctions.
Type ROTAX 914 F2/S1 (modied ROTAX 914 F Aircraft
engine, propeller shaft design with ange for
xed pitch propellers).
The ROTAX 914 F2/S1 is modied by STEMME and based on the type ROTAX 914 F2. The modication
was completed as a co-operation with ROTAX and with approval by ROTAX.
The base engine ROTAX 914 F2/01 is certied according to JAR-E / FAR 33. It is turbocharged and
has an electronic dual ignition system.
The modied version ROTAX 914 F2/S1 was specially developed for the model S12, a derivative of
the motorglider STEMME S10.
The engine modications are certied together with the S12 according to JAR 22. The modied
version ROTAX 914 F2/S1 has the STEMME (internal) production No. 11AM-M.
Due to special requirements for installation in the center fuselage, the following modications
were made:
• Relocation of the turbocharger unit to the aft of the engine to stay within the outlines
of the S12 fuselage. The turbocharger unit is supported by ve struts aft of the engine.
A supercharger inter-cooler is installed. Relocation of the turbocharger unit required
modications of the exhaust system. The exhaust headers are attached to the turbocharger
by springs, positioning them in spite of the high thermal stress.
• The layout of the oil pipes for the turbocharger are modied.
•
The exhaust headers and the muer are shrouded by temperature-resistant material, thus
thermally isolating the system from the engine bay. The turbocharger unit and the air box
are isolated by radiation protective shields.
• The original ROTAX engine mounting is not used. STEMME specially developed an engine
mounting for a center installation, consisting of two upper and one lower supporting
element.

STEMME S12 Specifications

General

Brand	STEMME
Model	S12
Category	Aircrafts
Language	English