Multiplex Mentor

Posted on Posted in Hangar, Planes
Plane: Multiplex Mentor
Span: 1,63 m
Length: 1,17 m
Build: Factory made kit, foam parts with carbon spar in the wing.
Setup: electric, HIMAX C 3528-1000, BL-54 ESC, 11×5,5″ prop. Recommended standard setup.
Controls: 4 channels: throttle, elevator, pitch, aelerons. Extra servo for tow hook is in place.
Weight: no battery, with battery placer board 1555 g (2200 mAh Lipo = 160 g, 4900 mAh Lipo = 390 g).

1 September 2009

The Mentor will be delivered this week. We study the build description on the site of Multiplex!

4 September 2009

The giga package has neatly arrived. All complete. This weekend we can start building.

18 February 2010

The modeling and flying has been suspended over the winter. Spring holiday means we look forward to some free time and hopefully good weather. In the past few weeks, the transmitter has been connected to the computer quite often to control the simulator. Jelmer had had a bit more practice already, but I also succeed in making neat short flights. Anton, our neighbor and instructor will give us some tips for the sim tomorrow. We hope it help to be able to make our rounds above the feeld in the near future.

Yesterday, Jelmer and I worked ourselves through the complete checklist to get the Mentor ready for its maiden. All rudder throws are correctly set, the centre of gravity is correct, electronics and battery are firmly attached, propeller is spinning in the right direction, so… All we need is good weather! Of the four models we have got in working order, three are ready for flight. Those are the Spirit, the RC Powers F-117 and the Dizzy Bird. The F-117 is a bit too quick, so it will have to wait a while just yet.

27 March 2010
The Mentor has flown! The training has begun. Check the blog (Dutch I’m afraid) for updates.
Movie here:

11 April 2010
Because setting and removing the battery is a fairly problematic job for someone with my size of hands, I designed a battery plank. This is made out of a 3 mm triplex board, a sateh stick, some tape and velcro. In the back of the compartment I made a hole, which is reinforced with some of the same triplex. The battery is mounted on the board and slides in together. Then the front of the board is held down by some more velcro. (Check the photos.)
This greatly fascilitates mounting and removing the battery. In case you are still building the Mentor, and you have sausage hands like me, I reccomend to do this right from the start. It might be easier to do so when the fuselage halves are still apart.
29 April 2010
Mentor gets caught in a tree. Only minor damage, could be repaired without costs. Only the removal from the tree costed €50,- because we couldn’t reach it ourselves.
22 September 2010
Crash by pilot error (Alfred). Damage:
  • Plastic snap plates on the wing
  • Plastic strip motor compartment came loose
  • Servo extention cable loose (can’t be reached without dentist’s tools)
  • Propeller
  • Spinner
  • Lipo (balancer cables shorted out and burnt away)
  • Nose dented (like my ego again…)
  • Pieces of the wing chipped away (repairable)
  • (Possibly) motor broken?
Next project: repair.
Note: after I wrote this, the Mentor was totally fixed. The battery was a write-off. We have had many succesful flights, and the latest experiment was to fly a banner. This was fun! But the battery wasn’t full so Jelmer made it only a short flight.