Technical constraints

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ESA / Education / Drop Your Thesis!

While defining their projects, applicants should read the ZARM Drop Tower User Manual (list of documents) carefully. Additionally they should keep in mind the following constraints that apply to the experiments:

  • Experiments are remotely controlled via the capsule computer system.
  • The overall height of the experiment may not exceed 953 mm (short capsule) or 1,718 mm (long capsule).
  • The maximum experiment mass is 264.4 kg (drop mode) or 161.5 kg (catapult mode) for the short capsule. Only the drop mode is available for the long capsule and the maximum experiment mass is then 221.2 kg.
  • The distribution of mass should be even.
  • For catapult experiments the deviation of the centre of gravity must be smaller than 1 mm in relation to the vertical axis. The catapult capsule will be finally tarred by engineers of ZARM FAB mbH as part of the capsule integration process.
  • Experiments are mounted on platforms of 700 mm diameter. Platforms are fixed by four stingers which restrict the free space to a diameter of 600 mm.
  • Point  load of a platform  may not exceed 50 kg.
  • The overall weight of a platform (including 15.5 kg for the platform itself) may not exceed 100 kg. The mass eccentricity should be as low as possible. If mass eccentricity is too high, additional counterbalance masses (accumulated to the payload) will be mounted to the rig at ZARM.
  • The experiment must be able to withstand the maximum deceleration of 50 g for 200ms. The deceleration can be regarded as a steady load rather than as an impulse. This means that holders of any item must be designed to cope with at least 50 times their normal load. A safety factor of two (100 times normal load) however is strongly recommended.
  • Catapult experiments must be able to withstand a peak acceleration of 30 g at the beginning of the experiment.
  • The power supply is provided by rechargeable a battery pack with a nominal voltage of 24 V DC (max. 40 Amp). Experimental hardware directly connected to the power supply needs to match the operation voltage limitation with a range of 22.6 V to 30 V DC.
  • The mechanical set up should be prepared by a professional workshop technician.

For further details on the technical constraints, please refer to the ZARM Drop Tower User Manual (list of documents).