Basic performance evaluation is crucial when developing a Mini Mortar Motorboat (MMMB). Here is a brief description of a performance evaluation method. This information may be requested from each group at the competition entry. Please refer to it.
Measurement Method for Displacement Volume Vf (cc)
Fill a transparent bucket or container (appropriately sized to fit the boat) with water up to the very limit of surface tension, and measure the total weight Wf0 including the bucket. Next, gently float the boat, which has been fully saturated with water preliminary. Once the water stops overflowing, gently remove the boat. Measure the total weight Wf1 including the bucket; Vf is then calculated as Vf = Wf0 – Wf1.
Measurement Method for Saturated Weight W (g)
This is the weight W measured after immersing the boat fully in water for at least 24 hours to ensure full saturation.
Measurement Method for Loading Capacity Vc (cc)
After fix the boat with putty, clay, or tape so that it does not tip over, measure the weight Wc0. Then, pour water into the loading space until it reaches the maximum amount without leaking. Measure the weight Wc1 at that point; Vc is then calculated as Vc = Wc1 – Wc0.
Measurement Method for Unloaded Draft (mm)
Float the water-saturated boat on the water surface. Use a pencil, masking tape, or something to mark the water level at the bow, stern, and midsection. Measure the height from the bottom of the boat to those marked positions.
Electric Motor Specifications
The only choice for the motor is the Tamiya Submarine Motor (Yellow). Its weight is between 35.5g and 36.5g, excluding the battery. The battery used is a single AA battery, which weighs between 22g and 24g depending on the manufacturer.
