Pressure Vs High Altitude

Sea Rider

Supreme Mariner
Joined
Sep 20, 2008
Messages
12,345
Just some test comments :

Inflated a 4.20 mtr sib inside a shadowed garage to 3.5 psi gauge metered at an altitude of 2,350 mtr above sea level, the sib was placed on a flat bunk trailler well strapped & covered and driven to the coast.

Arrived completely defleted to 1.0 psi with hanging straps over sides, had to be pumped to full working pressure again at sea. What you must NEVER DO is transport any well inflated sib/rib from sea level to high altitudes, deflete at least to match same pressure when arrived down and strap loose, release straps tightness at least twice on your way up, or you will be extremely overtighting the tubes.

If you do not have a gauge, better is to inflate boat once arrived to your boating location or you wll hear a load bang on it's way up :mad: No problem going down from high altitude to sea level :D

Happy Boating
 

deejaycee_2000

Captain
Joined
Mar 28, 2006
Messages
3,447
Re: Pressure Vs High Altitude

you must never tow your boat fully inflated, only inflate it just before you launch ..... funny you mention altitude, when I go racing inland, I have to adjust my carbs as the performance inland is totally different from the coast .... much nicer at the coast ..... the water temperature also plays a big role ...
 

livendive

Seaman Apprentice
Joined
Aug 25, 2010
Messages
34
Re: Pressure Vs High Altitude

I'm coming into boating from skydiving, where altitude differences are sometimes covered in relatively short periods of time. When we're taking an inflatable out of an airplane to play with in freefall, we inflate about 1/3 of the way on the ground, which usually makes it nice & tight 12,000' higher, and it deflates again on the way down. A bag of chips will pop in a climb to altitude, and for everyone 1000' gained in field elevation a parachute flies about 1 size smaller. We also have electronic devices to pull a reserve for us, should we become incapacitated during a jump...calibrating these for the landing area, in current weather conditions is VERY important.
 
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