I’ve started construction of the weights that will be swung around by the Servos. They each have the following properties

• Built from Steel Rod with diameter 50 mm
• Thickness of 15 mm
• Angular distance is 90 degrees
• 10 mm cut out from centre
• Weight is approximately 46 grams each

A picture of these is shown below.

By having these weights positioned so that their curved edge is 26 mm from the centre of the rocket, we should be able to move the Centre of Gravity by 1.25mm. This will be a significant achievement if we can complete this payload. This will mean with a 100N thrust motor, we will get a moment of 0.125Nm. If the rocket has a Moment of Inertia of 0.25 kgm^2, then we are looking at Angular acceleration of 0.5 rads-2. This means that for a burn of 1.5 seconds in a vacuum, this would result in:-

• Angle of Rotation = 0.5625 radians = 32 degrees
• Rotation speed = 0.75 radians per second = 43 degrees per second

During tests on ground (in atmosphere), we would experience aerodynamic forces that would help to counteract this movement, so the effects would not be so great.