Multiplex TwinJet

Review 26-Apr-2004 Patrick Plawner Video Available Follow the link 
Motor 2 x 400
2 x Permax 480
2 x Permax 450 Turbo
2 x Kontronik 400-23 Brushless		 Servos 2 x HS-85BB
Speed Controller BEC 35 Amp
SMILE 40-6-12		 Batteries 7 Cells to 10 Cells
NiCa CP1300 to Ni-MH 3000
Channels 2 + motor Flight Time 3 mn to 15 mn
Propeller Gunther 5.5x4.5
CAM prop 5.5x4.3		 Gear Box not used so far

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Wingspan 35.8"
91 cm		 Length 31.6"
82 cm		 Empty weight  22.7oz
 640 gr		 Max flying weight  oz
 1300 gr
Wing Area  395.3 sq.inch
 25.5 dm²		 Wing load  oz/sq.ft
 gr/dm²		 CG location
from wing edge		 "
 cm

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Building

Fast, few hours for someone slow, and easy. Manual very clear. Tips: add some strong tape below the plane, all along the bottom fuselage, to make is resistant on hard landing, or eventually crashes. Add some Servo protections. Can be build with Epoxy or Cyano. The foam takes and accepts anything I tried, glue or painting. The space for the servos, accepted initially only Micro-servos, like HS-55. My HS-55 broke few times, so I decided to upgrade to HS-85. Needs to remove some foam, in order to be able to put this bigger servo into place. 
For pictures and some explanations on how to build the TwinJet, follow this link
Re-enforcing the Twinjet Structure - Follow the link
Take-off Hand launch. Easy if battery Pack not too heavy (below 400 Gr). For a RC2400, 9.6V, or NI-MH 3000, 9.6V, the weight is 500g and this makes it a little tough to take off without wind. A hard push then does the job.
Flight behavior With 7 cells, nice and easy, but not much stunts, unless taking speed going down. With 8 cells, it starts to become alive, the CP-1700 does a good work for this configuration. with 10 cells, although the flight time is short, about 2 minutes or less, this is incredible. Take-off and vertical immediately. Will hold vertical for 10 to 20 meters (30 to 60 feet), does any stunt in the book, and flies beautifully, with authorityl. Stalling is with no bad behavior, it will just stop climbing and will drop altitude to get more speed.
It flies beautifully in general, with a look and feel like a real plane. It's noise is very nice and not too strong, with twin motors.
Landing Nothing special, easy to land, unless you stall just near the ground
Crash Results The  nose can bend, break from the rest of the fuselage. The motors will also break from the fuselage, on very hard landing or crashes, again, Epoxy or Cyano do good. Once crashed in a Chicken farm, with nose separated from fuselage, both motors and foam which holds them broken apart, both props gone, and cockpit broken in 2 parts. Repaired in less than 40 minutes.
Repairing Foam, so Epoxy and Cyano can do anything.
Other comments Note that the Twinjet, equipped with only 1 strong brushless motor, flies much better, than the twin motor version.The reason being that you can install a bigger prop. See full review on this within the Arena, done by Oded Mazor, or follow the direct link here

- Not too big to carry 
- Can be upgraded up to brushless 
- Could be stressful, if you don't have enough experience as this plane can fly quit fast and be out of sight also (This is how it ended in the chicken farm....) 
- TwinJet Hi"story"
- Flight Time and Consumption using Permax 450Turbo
- Flight Time and Consumption using Kontronik 400-23 Brushless
- Twinjet with smoking system installed
Interesting Links Go and Visit the Twinjet Arena !!! Must see for many pictures, tips, reviews, customizations !!
FMS plane - TwinJet
Pictures - Miguel Sala Twinjet
- TwinJet Crash against wall and repairs
- TwinJet, equiped with Kontronik Brushless TwinDrive System Construction
- Sunset with Twinjet
- Aerial photography using the Twinjet and the Mini PenCam 1.3
- GPS installed in Twinjet, for measuring maximum speed
- Twinjet with smoking system installed
- Twinjet with bomb mechanism system installed and working

Latest Update: Friday, 09 November 2007