It's off topic, but in reply to the why change power from 70kts to 100kts from idle to full power:
An airspeed change of greater than 20kts technique:
Let's say you're at 1800RPM, 70kts s&l. To increase speed to 100kts in s&l you increase to full power, then anticipate 5kts before 100kts (at 95kts) select 2200rpm (which is supposed to give you 100kts s&l).
The reason of this extra burst of power before reducing it is to make the airspeed change faster.