Construction / tuning:

This was my third TwinStar that I build and converted.

This time around I was up to maximize the speed and so I selected a
power set (motor, ESC & prop) that usually comes for the Robbe
Projeti - a fast plane running up to 200 km/h.

The following were the modifications made:

1) extension of the CFK rod in each wing until the wingtip in order to
increase stability of the wings
2) glue both wings together
3) increase the length of the battery compartment (in order to be able to
slide back the battery for another 4 cm and to achieve the CG point
4) use metal gear servos all around
5) run the ESC cables to the receiver not in the shaft nest to the power
cables to the motor, but run them on the underside of each wing in a
trench that I burnt with a soldering pen (and closed with a strong tape).
6) despite the  extension of the battery bay I still had to add weight to
the tail of the plane (35 g) to achieve the indicated CG point. In the
future I might even re-allocate both the rudder & elevator servos further
to the back in order to avoid the additional weight.

Total consumption of both motors together during testing: 76 A (38 A
per motor).

I was surprised how smooth both motors run and virtually no vibrations
were detected. But...what a noise - reminds me to the FunJet (just
double from both motors).

And for those who do not understand why I would convert the TwinStar
into a Speed plane ... well it is just for fun and for the experiment!
RCSKYLINER.com
Site for radio controlled airplanes and more ...
NAME:
 
TWIN STAR 2 - SPEED
PRODUCER:
 
Multiplex
TYPE
  all parts in foam (Elapor)
WING SPAN:
 
1420 mm
LENGTH:
 
1085 mm
WING AREA:
 
43 dm2
WEIGHT PER DM2
 
35 gm / dm2 (tbc)
WEIGHT (producer):
 
1500 g
ACTUAL WEIGHT:
 
1685 g (out of which 412 g = battery pack)
MOTOR:
 
2x Robbe 2845/07 (2x Set Robbe Projeti B)
MOTOR DATA:
  Inrunner, 135gr / 300 W / 34 A / 2600 v/rpm
PROPELLER:
  5,5" x 4,5 " (APC)
BEC / CONTROLLER:
 
2x Robbe BL ESC 45 (45 A)
RECEIVER:
 
Futaba 2,4 GHz (6-channel R-6006 HFC)
BATTERY:
 
Robbe Lipo 5000 mA / 11,3 V / 25 C
CHANNELS:
 
5 (motor, rudder, elevator, 2x ailerons door)
SERVOS USED.
  2x Hitec HS-85 MG (rudder, elevator)
2x Hitec HS-82 MG (ailerons)
RATING - BUILDING:
 
stock - beginner friendly, this conversion -
intermediate
RATING - FLYING:
 
.Intermediate - professional
All rights reserved by rcskyliner.com and its owner!

Flight Experience:

Another day in July 2010 brought along the first flight of this Twin Star 2
- Speed Edition. With 3/4 throttle I through the plane and .... if flew, fast,
faster, and within 10 seconds I had to turn around as danger lingered
that I would be unable to recognize the flight of the "point in the sky".

Well, yes, I had to trim substantially down during full speed of the
motors (which as of the second flight I corrected by programming the
transmitter) also during full speed the plane had a tendency to pull to
the right (which was also corrected with one of the 5-point curve mixers
that my transmitter provides).

The TwinStar Speed behaves more like a jet plane regarding speed,
wide maneuvers, huge loops, roles (slow and big), turns (TS2S likes
them) and due to the power motors vertical climbs are possible.

What actually surprised me that with 1/2 throttle the cruising speed is
already high and you can manage all maneuvers - and (that was the
surprise) - the plane motors (props) emit little noise! That changes
though when you push the plane hard!

Flight time: 6 min with full throttle - 8 - 10 minutes with mixed flights
(max achieved were 14 minutes).

Last but not least: beware of the still great gliding abilities when
landing - so plan your landing wide and low! It comes in with speed but
after two or three attempts I learned fast on how to handle the Twin Star
2 Speed Edition.