I must point out that any device similar to a spirit level works well on the ground and it works reliably in an aircraft only if the aircraft is in "stationary horizontal" flight, meaning not acellerated in any axis, neither increasing nor decreasing speed. They won't work at all during inverted flight, which is part or aerobatics.
Any g-load on the device will make it appear to be straight and level, since the bubble follows the center of gravity of the liquid being used. (also mercury)
There are three axis acellerometers which sense real acelleration, regardless of the flight maneuver, e.g. applying ailerons in one direction and rudder in the opposite direction will make the aircraft fly a straight line with the nose pointing some considerable amount of angle off track.
Consequently those sensors sense deviations around the vertical axis in that case only. During coordinated straight line flight it senses drift angle.
Since you control your model aircraft in a line of sight range I'd recommend to use a low power transmitter in the 433MHz band (check out Hope-RF) and transmit voice commands depending on the axis and the angle off situation, using a voice recording chip to be recorded according to your desires (either use commands like "raise right wing" instead of a situation report "right wing low".
A good voice recording chip for multi messaging is the ISD1700 series from Winbond with the ISD1730 offering a max recording length of 30 seconds and the ISD17240 with 240 seconds at 8KHz sampling frequency.
Boncuk