Facts:

The engine is fourstroke.The cylider volume is 10 cc with 10 000 rpm. That means that it sucks air during 5000 rpm. The air contains 20% oxygen. The fuel is a mixture of  methanol and oil with 80% methanol, the density of which is
0.79 g/cc. The fuel tank volume is 400 cc.
The volum of one mole of a gas is 25 dm³/mole.

Calculate the maximum time of flight.

At v_e = 14.5 cm³ all of the aluminiumions are changed into aluminium hydroxide. In this case multiples of 14.5/3 - that means 4.8 cm³ are of  interest. For instance the figure of the curve at v = 19.3 cm³ indicates that the complexe aluminate ion, Al(OH)₄^- is completely formed. At v = 4.8 and 9.7 you may see something that indicates the two first steps of proteolysis of  the aqeous complex Al(H₂O)₆³⁺.