Multiplex Micro-Jet

From EFlightWiki
Jump to: navigation, search
MultiplexMicroJet.jpg

The Micro-Jet is a small Elapor foam model with a pusher motor and elevon control. It was widely criticised for being underpowered and hard to launch, but with a modern power system it is fast and smooth.

Multiplex Micro-Jet Manual (pdf)

Specifications

  • Wingspan: 26 in
  • Length: 23.6 in
  • Wing Area: 201 in sq.
  • Weight: 15.9 oz
  • Wing Loading: 8.80 oz. | sq. ft.

A page to summarize mods, popular motors, etc for the Multiplex Micro-Jet (MJ), as found at Multiplex USA.

note: Xorbe is through pg 30 of the thread so far.

Launching

The short wingspan causes a lot of a torque-roll when the model is thrown. An unwary pilot can easily find the model inverted after launching. A number of techniques have been used successfully:

  • A Bungee can be used to reach flying speed before the motor is started.
  • Tipping the model to the right (i.e. starboard wing down) while throwing, so the torque rolls the model upright.
  • Half power, reducing the torque effect.
  • Sufficiently powerful models can be launched into a 45 degree climb, where they have the height to perform a complete roll - this is obviously not for the faint-of-heart!

Motors

The stock power system is a 6v speed400 motor and an 8 cell 500mAh nicad (or 1100mAh Nimh) battery, but this is underpowered by today's standards.

In-runners or canned out-runners are a quick replacement for the stock Speed 400 brushed motor. Bare out-runners will require more creativity to mount (usually an L-shaped aluminium bracket). For a 3s battery, the motor should have a Kv between 2000 and 3500 with a 5x4.5" prop.

Batteries

The stock nicad weighs 150g, about the same as a 3s 1800mAh battery. A 3s 2200mAh battery will just fit, but needs to be right at the back of the battery bay.

The Mods!

Custom Mounts

Canard

CF Spar Length of Foam

EDF

Landing Gear

Paint Jobs

LEDs

Carnage

Fin Chop

Extended Turtle-Deck

Flat Hatch

Elevon Hinge

Removable Fins

reduced aileron throws / exponential

scooping out the foam to enlarge hatch

sanded epoxy

min wax WBPU

hot glue/CA in the elevon hinge