Zenith Aircraft Company







Rotax 912

Rotax 912 ULS

Rotax 912iS

Rotax 912

100 HP* 912 ULS

Zenith Aircraft Company recommends the Rotax 912 series engines as the standard powerplant for both the ZODIAC CH 601 series and the STOL CH 701. The new 912 UL S is a 100 HP* version of the certified 81 HP 912 engine, with the same external dimensions as the standard Rotax 912. The Rotax 914 is a turbocharged version of the Rotax 912 engine, and the new Rotax 912iS engine is the latest engine from Rotax, with fuel injection and an engine management system (ie. FADEC control).

Click here for details on the new Rotax 912iS  Click here for details on the 80-HP Rotax 912

Rotax Engine Price and Engine Installation Packages (Zenair Ltd.)

Rotax Engines

Rotax 912 ULS

Rotax 912 ULS Aircraft Engine (suitable for fixed pitch propeller).
Non - Certified Version.  
Click here for a detailed specification page on the Rotax 912S (pdf doc)

  • Continuous Performance: 69.6 KW (95 HP) @ 5500 RPM
  • Take - off Performance: 73.6 KW (100 HP) @ 5800 RPM (Max. 5 min.)
  • Fuel consumption at 75% continuous power: 4.9 gph
  • Engine TBO (Time Between Overhaul): 2,000 hours

4-stroke, 4 cylinder horizontally opposed, dual spark ignition engine, one central camshaft, pushrods, OHV:

  • Liquid cooled cylinder heads, ram air-cooled cylinders
  • Dry sump forced lubrication
  • Heavy duty electric starter and starter relay
  • Dual breakerless, capacitor discharge ignition
  • Rectifier/regulator
  • Electronic dual ignition
  • Intergrated reduction gearbox (i=2.43) with slipper clutch
  • Integrated AC generator
  • Mechanical (engine driven) fuel pump
  • R.F.I. suppression
  • 2 carburetors

* Full 73.6 KW (100 HP) available only when installed with Rotax tuned intake and exhaust systems designed for the 912 S UL. Use of other intake and / or exhaust systems may result in reduced take-off power. Potential users of the 912 S UL should consult the 912 S Installation Manual for more detailed information.

Zenith Aircraft Company supplies complete firewall-forward packages for the Rotax 912S powerplant installation, including the engine, engine mount, fiberglass engine cowl, exhaust system, liquid cooling system, electrical system, propeller, all all other accessories (available only to builders of Zenith Aircraft kits).  Zenith Aircraft Company supplies the Rotax 912S engine with the Rotax slipper clutch option installed, for smoother engine operation.

Zenith Aircraft Company supplies a custom-made stainless steel exhaust system with its Rotax 912 firewall-forward kits.  The high-quality exhaust system is developed to provide years of maintenance-free operation,  and is custom-made for the ZODIAC series and the STOL CH 701. Rotax 912 Stainless Steel Muffler
Rotax 912 Installation Tips & Techniques Rotax 912 Installation Tips & Techniques instructional DVD from HomeBuiltHELP.com

For more information on Rotax engines:

Above information provided by Rotax. Subject to change or revision without notice.

The above resources are provided for informational purposes only. Alternative engines will affect performance, specifications and flight characteristics of the aircraft. Also, the weight and balance of the aircraft may be adversely affected by alternative engines, and the original fuel system may not be adequate or suitable for some engines. Most alternative engines will require a custom engine mount and engine cowl. Zenith Aircraft Company does not manufacture or directly support engines.


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 Zenith Aircraft Company

Zenith Aircraft Company
1881 Airport Road, Mexico Memorial Airport
Mexico, Missouri, 65265  USA.
Tel: 573-581-9000 (Mon - Fri, 8-5 Central),
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