Reply
 
Thread Tools Search this Thread
 
Old 12 January 2015, 04:16   #11
Member
 
Country: Other
Town: Stanley, Falkland Is
Boat name: Seawolf
Make: Osprey Vipermax 5.8
Length: 5m +
Engine: Etec 150
Join Date: Mar 2006
Posts: 3,688
Yes it's normal. I was sitting on mine outside the garage the other day in direct sunshine and the pressure relief valves were whistling gently to themselves with the tubes almost too hot to touch, put it in the garage and a cold night inside meant they were too soft to use the following day. Cold water has much the same effect (very noticeable here with typical water temp of 4 C - you can be fine when you launch but after 10 mins running need to top up the tubes because the air in the rear chambers has cooled right off).

A rule of thumb (literally...) is to estimate the displacement if you prod the tubes hard with your thumb. I'd say if you can easily push them in more than half an inch or so, they are probably too soft.

I used to be paranoid about mine overpressuring in strong direct sunlight in my old boat, which is why I've got PRV's in the current one so I can keep them pumped up hard without having to worry about an expensive bang!
__________________

__________________
A Boat is a hole in the water, surrounded by fibreglass, into which you throw money...

Sent from my Computer, using a keyboard and mouse
BogMonster is offline   Reply With Quote
Old 12 January 2015, 08:32   #12
Member
 
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,610
Your usage pattern will also matter: SDtanding on a traile ri nthe sun will toast the tubes nicely. Put it in the water and you get instant cooling! (why I always do the last pump of a sib afloat if I can)

On a summer's day I will normally leave the garage with the toobs "wobbling" in my rear view mirror. in about 10-15 mins they have "solidified", and then after launch I need to top them up. Likewise if I recover late i nthe evening I;ll jsut leave them "up" for the trip home. If it's the middle of a hot afternoon I'll let a bit of air out. (I don't have relief valves, but will be fitting them whenI get round to re-toobing it.)
__________________

__________________
9D280 is offline   Reply With Quote
Old 12 January 2015, 13:06   #13
Member
 
Country: Australia
Town: NSW
Length: 4m +
Join Date: Sep 2013
Posts: 308
well no response from caribe so i rang some dealers, all had different responses, ranging from 3.0 to 3.5 hahaha. so whats the point of a pressure gauge if i dont know the correct pressure.
__________________
SpearRib is offline   Reply With Quote
Old 12 January 2015, 13:52   #14
Member
 
Peter_C's Avatar
 
Country: USA
Boat name: Uh...a kayak?
Length: 4m +
Join Date: Dec 2009
Posts: 1,485
The point is "we" have no clue what our boats are at pressure wise. 3 psi is pretty good for "most" tube sets. You will get the proper tube pressures soon enough. Someone else must own a Caribe and have the manual/knowledge.

Case in point: Saturday I was bringing my tube pressure up for Sundays adventure. I inflated the keel pushing on it until it felt right, and banging on the tubes until they felt right. Then got out the pressure gauge, and checked the tube pressures. The keel was at 6psi (Should be at 3.5 psi), and the tubes were at 2 psi (Should be at 3 psi). I can get the rear tubes very close by how the conical ends feel and do not fold over. The front tube is harder to determine. Especially on my SIB the pressure makes a big difference in how it rides, and more importantly, handles.
__________________
Peter_C is offline   Reply With Quote
Old 12 January 2015, 14:10   #15
Member
 
Country: Australia
Town: NSW
Length: 4m +
Join Date: Sep 2013
Posts: 308
Good point. Im ordering a bravo gauge today.

Can I inflate push pull caribe valves without a halkey roberts adatpor for hand pump. The pump the boat came with didnt come with an adaptor, so I presumed there must be a way?

Also should 3.0psi be its pressure in the garage or on the water?
__________________
SpearRib is offline   Reply With Quote
Old 12 January 2015, 17:05   #16
Member
 
Peter_C's Avatar
 
Country: USA
Boat name: Uh...a kayak?
Length: 4m +
Join Date: Dec 2009
Posts: 1,485
Quote:
Originally Posted by SpearRib View Post
Can I inflate push pull caribe valves without a halkey roberts adatpor for hand pump. The pump the boat came with didnt come with an adaptor, so I presumed there must be a way?
Someone else is going to have to answer that one. I have different valves, and built my own gauge adapters.

Quote:
Originally Posted by SpearRib View Post
Also should 3.0psi be its pressure in the garage or on the water?
I store my boat with less than .2 psi in it. Totally flappy when cold. When hot it gets maybe .5 psi in it and the tubes become firmer.

When ready to head out on the road, I bring my tubes up to a good pressure for the day/weather. In other words if it is sunny and hot I keep them softer at the house to the launch site. Often when pulling the boat at the end of the day knowing it will no longer be cooled by the water, I let air out of the tubes before trailering home.

Once out on the water I check the pressures and top up as needed. I only have a hand pump for on the water though. Wish I had a nice electric pump...
__________________
Peter_C is offline   Reply With Quote
Old 12 January 2015, 17:13   #17
Member
 
Country: Australia
Town: NSW
Length: 4m +
Join Date: Sep 2013
Posts: 308
Wow thats a lot of work, Im sure its worth it. I need a lazy mans version :-)

Yeah Im not sure how to check if caribe valves can take air in without letting it out which is the only way i can see it working without the halkey adaptor.
__________________

__________________
SpearRib is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 02:14.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.