I got my Twinjet after noticing they were going on special. I suspected that they were going to be discontinued in favor of the new Multiplex Funjet. Since the price was right and I’ve regretted not getting a couple of other models as they were going out of production I got one.
The Twinjet comes with just a couple of pieces. The parts kit includes the hardware for control surfaces and motors. The Twinjet requires two servos and two 12 inch servo extensions. I used HS-81 servos from Hitec. They fit perfectly in the molded recesses in the wings. Instead of soldering the servo leads to the extension, I carved out a small cavity for the connector along the wire path molded into the bottom of the wing.
The bottom rear of the fuselage has an open space that is covered by the wooden fuselage support mounted on the bottom of the fuselage. Both the motor and servo leads can be routed through the sidewall into this area and a larger hole drilled into the battery and radio bay that is access through the canopy. Since the motors are rear facing, don’t overlook the instructions that describe the capacitors and reversal of positive and negative leads. I used APC props with propeller collet cone adapter. The props, too have to be mounted with the text facing forward.
Inside, I mounted the receiver near the back and the battery in front. The two 480s on the rear weigh a lot and I needed to add weight to the nose even with the battery just behind the rubber band holding the front of the canopy down. Using a technique from one of the message boards, I fashioned a battery cradle from foam rubber to keep it from moving around. I later cut the sides of the cradle down to increase the battery’s exposure to the airflow. They had been pretty warm on a couple of occasions.
Speaking of airflow, you’ll notice that I used the plastic spoon technique to add airflow through the electronics compartment. This was done by carving out an opening below the front of the canopy with a rotary tool sanding drum and then cutting the spoon bowl from a plastic soon in half. The result is a nice scoop grabbing the air flowing over the nose. A similar opening (without the spoon) was made at the rear of the compartment for the air to exit. Take a look at the Twinjet Manual here.
Here are the Twinjet's statistics:
|Motors||2 Speed 480s|
|Props||2 APC 5.5X4.5|
The Twinjet is pretty sensitive. I asked a friend with greater experience to pilot the maiden flight. He flew it at the recommended throws. Afterward he suggested adding some expo to the radio and programming in high and low rates.
The maiden flight showed the high roll rates and snappy speed of the Twinjet. Even on the low rates, it will turn heads and elicit some comments from the pits. The sound of the twin motors and a white streak zooming down the flightline is sure to please.
I’ve been flying the Twinjet several months and haven’t found any bad habits. With a bit of a “draggy” form, it will slow down quickly. Its slow speed handling is good and it glides reasonably well for a delta wing aircraft. I’ve found just a bit of power on final gets the Twinjet to the runway slow and nose up. With no gear and rear mounted props, the power comes off just before touchdown and the props spin out of the way. I haven’t broken a prop in any of my landings, including those on hard surfaces.
With expo and low rates, it’s definitely within the grasp of an advanced beginner looking for a cool looking jet-type airframe. Several Twinjet fans have mounted brushless motors on their Twinjets. It is a fairly easy conversion with an ESC for each motor. The brushless motors produce more power and thus speed. Some who have done this report, however, that the airframe will put a limit on how fast you can get. I’ve seen reports of Twinjets topping out at about 100 MPH or so. If you have the need for speed, the Funjet might be a better choice. It requires only one motor and is more streamline so it can really scoot.