Maybe you noticed that even in full summer at night the air pressure in your dinghy goes lower.
It is called CHARLE’S LAW (or law of volumes).
Jacques Charles has studied this phenomena back in late 1700 and noticed a direct relation between temperature and gas volume.
Long story short we can say that:
Pressure and temperature are directly proportional.
At a growth of temperature, corresponds a proportional growth of pressure, and same goes for their decrease.
x2 temperature = x2 pressure
1/2 temperature = 1/2 pressure
During summer especially we experience a strong temperature gap between day and night hours.
This is the reason why we see the rhib deflated while just few hours before was totally fine.
During autumn we see a strong drop of temperatures, and is REALLY IMPORTANT that when you will get onboard to move your rhib, or jump on a tender YOU REMIND TO INFLATE IT or bigger issues will occur.
START FROM ASTERN, so u will give full pressure on the planing surface, then proceed ahead.
WHY SHOULD I INFLATE FROM ASTERN AND NOT FROM AHEAD?
Inside the tube there is a BAFFLE or DIAPHRAGM, which moves ahead/astern accordingly to the section u inflate first.
When u inflate bow-to-stern, the planing compartment is the one which is subject to the highest temp gap, cause its pressure is directly depending from the 1,2,3 ahead..
While if u start astern, the diaphragm moves ahead, and that very compartment is a leading one now.
In this way it us subject to temp gap, but much much less, and is easier to inflate cause will keep a higher volume.
That is a planing surface so MUST be kept hard anytime using the rhib.
In order to inflate properly your dinghy follow our guide: ideal pressure for a dinghy.