otax 447UL power package

by Michael A. Anderson

otax 447UL power package

Power your favourite recreational aircraft with this light and efficient aircraft engine
Choose your options and view your total at the bottom of the page.

Looking to power a Challenger ultralight?
We have a solution specially for you!
Rotax 447UL Challenger power package

1. Engine

New Rotax 447UL aircraft engine
  • 39.6 HP @ 6500 RPM
  • 34.0 ft-lb @ 6000 RPM
  • 2-stroke engine specially developed for recreational aircraft
  • 2 cylinders, cooled by fan
  • Piston ported intake
  • Single capacitor discharge Ignition (SCDI)
  • Single Bing carburetor
  • Mikuni pulse driven diaphragm fuel pump
  • Time Between Overhauls (TBO): 300 hours

More Rotax 447UL Specifications

2. Gearbox and starter combination

No gearbox, recoil starter
Use only if you are planning to install a third party belt reduction drive.
Rotax 2-stroke aircraft engines produce their power at high RPMs. Propellers need to turn much slower.

The B type gearbox is the most economical and lightest model available. It is limited to a propeller mass moment of inertia of 3000Kg/cm2 (about propeller mass moment of inertia)

Although the C and E type gearboxes are available and compatible with the 447UL, they are not usually necessary in most applications. Contact us if you are considering a 447UL with one of these gearboxes.

B type gearbox, recoil starter
Available with reduction ratios of 2.00:1, 2.24:1, 2.58:1, 3.00:1
B type gearbox, electric starter
Electric starter installed on the magneto end (opposite the gearbox). Includes starter solenoid.

3. Intake

Rotax/K&N single carburetor air filter
Washable, reusable air filter has a safety wire tab for positive securing.
Either install this air filter directly onto the carburetor…
Rotax single carburetor intake silencer with Rotax/K&N air filter
Can be rotated to suit most installations.
Or install the intake silencer with air filter. A major part of the noise of a Rotax 2 stroke aircraft engine is the clatter emanating from the carburetor’s throat. The intake silencer efficiently muffles this noise. Slight effect on power: about 2% loss.

4. Exhaust system

Rotax side mount type exhaust system
Mounts on the side of the engine.
Choose the exhaust system which best suits your installation.

Download our exhaust systems document which illustrates their configurations and dimensions.
exhaust.pdf / 199Kb /
Adobe Acrobat format

Rotax rear mount type exhaust system
Also known as 2×90� or Eipper style, mounts behind or below the engine.
Rotax straight type exhaust system
Points straight back after the elbow.
Rotax after muffler
Easy clamp-on installation
This after muffler further reduces the exhaust noise while producing no adverse effect on performance.

5. Fuel system

ACS Gascolator
Machined anodized aluminium and steel construction. With fine steel filter element, drain valve and provision for primer line connection.
A water strainer (gascolator) should be part of all aircraft fuel systems. It ensures that any water that could have been drawn into the system will not reach the engine.
Bosch fuel filter
Fine nylon mesh filter with transparent plastic casing.
This high quality filter is easy to inspect.
Primer pump
High quality made in USA.
A primer pump allows quicker and easier starting at times when your carburetor float bowls are empty.

6. Electrical system

Rotax regulator-rectifier
High quality, durable model.
The regulator-rectifier converts alternative current produced by the engine’s generator into 12 volt direct current for use with instruments, lights, radios, battery charging, etc.
Genesis G13EP Battery
13Ah capacity, 4.9 Kg / 10.8 lbs
These batteries feature sealed pure lead technology for the ultimate in safety (nonspillable, can be installed in any position) and starting power.

7. Propeller

There are too many different propeller brands, types, configurations and options available to list here. For more information about the propellers we offer, please visit our propellers page. You may also contact us for a personalized recommendation.

8. Engine controls

Aero Controls Throttle Cable
Single carburetor cable with 90 degree housing end. 96″ length can be cut to fit most installations.
Stainless steel cables running inside maintenance-free nylon and wound steel housings ensure the smoothest and most precise operation.
More information about our Aero Controls products
Aero Controls Choke Cable
Same as throttle cable.
Aero Controls throttle and choke quadrant
Two levers with friction control knob.

9. Engine monitoring

Set of Westach 2″ size instruments

  • Tachometer
  • Hourmeter
  • Two-in-one CHT
  • Two-in-one EGT
  • 2 CHT probes
  • 2 EGT probes
    panel size: 4x�2″
It is essential to monitor the following engine parameters to ensure its proper operation:

  • Tachometer (RPM)
  • Hourmeter
  • Cylinder Head Temperature (CHT) for both cylinders
  • Exhaust Gas Temperature (EGT) for both cylinders

There are different ways to accomplish this. The first is to use the classic analog (steam gauge type) instruments.

MGL Stratomaster EMS-503: Tachometer, hourmeter, 2xCHT, 2xEGT, 2 CHT probes, 2 EGT probes, panel size: 2-1/4″, very small display, use only if panel space is very limited
The alternative is to use a digital all-in one instrument. Our selection provides precise and reliable readings on backlit liquid crystal displays (LCD) and has the advantage of being able to trigger a warning light to attract your attention if a parameter is out of limits.
More information about instrument packages for the 447UL
MGL Stratomaster E1: tachometer, hourmeter, 2xCHT, 2xEGT, 2 CHT probes, 2 EGT probes, panel size: 3-1/2″, larger easy to read display

Currency: Canadian Dollars. Check current exchange rates
Suggested list prices.  This total is an estimate. Prices are subject to change without notice. Shipping and applicable taxes not included.

Please contact us for your best deal!