There are several factors that could cause the aircraft to roll to the left. 

The most prominent factor that effects all single engine, propeller driven aircraft is P-Factor. This effect is caused by the air flowing from the propeller wrapping around the fuselage and hitting the side of the tail. This causes the aircraft to yaw to the left. This effect is directly proportional to engine rpm and is most noticeable at low airspeeds and high power settings (such as during takeoff). This effect can be countered through throttle control, and aileron and rudder inputs. It is important to note that unlike other general aviation aircraft, the Tomahawk does not have aileron or rudder trim that is controllable by the pilot, so these inputs must be constantly applied by the pilot using the primary flying controls.

Another factor that could cause the aircraft to roll to the left is weight and balance. A fuel imbalance where there is more fuel in one wing compared to the other could cause the aircraft to roll in the direction of the heavier wing. To avoid this, it is important to keep switching fuel tanks at regular intervals throughout the flight to keep both fuel tanks in balance. An ‘Auto Fuel Selector’ option is available on the ‘Aircraft’ page of the EFB/tablet, and once enabled, automatically switches the fuel tank on a regular basis. 

One additional weight and balance factor that could cause the aircraft to roll to the left is the co-pilot. If the co-pilot is disabled on the ‘Aircraft’ page of the EFB/tablet, then there will be no weight applied to the right seat. As there is weight in the left seat from the pilot flying, this causes a slight weight imbalance and thus a roll to the left. 

In the v0.1.2 update to the Tomahawk, we added the ability to adjust the static trim tabs on the ailerons and rudder during the interactive walkaround. Once you have clicked on one of the ailerons during the interactive walkaround, two aileron trim presets allow you to instantly set the correct aileron trim required for the aircraft to maintain straight and level flight depending on the number of pilots onboard. The aileron and rudder trim can also be adjusted manually in 0.1% increments.