Reply
 
Thread Tools Search this Thread
 
Old 26 September 2006, 18:27   #1
Member
 
Country: Other
Town: Oakley
Boat name: Zerstörer
Make: Ribcraft
Length: 5m +
Engine: Suzuki DF 140
MMSI: 235050131
Join Date: Jun 2003
Posts: 3,931
Tube Pressure.

Might seem like a stupid question but how do you tell, if you haven't got an indicator, if your tubes are the correct pressure ?

I prefer really firm tubes (oooer) but often wonder if these pass too many stresses to the rest of the boat.

As temperatures are now beginning to cool I've noticed the tubes are a bit flaccid.

Would I be correct in pumping them up hard or leaving a bit of give in them.

?
__________________

__________________
Biggles is offline   Reply With Quote
Old 26 September 2006, 18:34   #2
Member
 
Country: Ireland
Town: Ireland , cork
Boat name: liberty
Make: lencraft
Length: 6m +
Engine: outboard yamaha 150
Join Date: Jan 2006
Posts: 57
normal tube pressure is aprox 6 PSI.
when it gets cold the air in the tubes contract so the tubes get soft so go ahead and re pump the tubes with the foot / electric pump...... not like a local dive club who used their dive bottle and burst the tubes.
Most modern ribs have safety overpressure valves that will open if the tubes are over pressurised.
Saw a rib tube gauge on ebay last week for small money. When I locate it again I will post the link here

Sparkey.
__________________

__________________
sparkey is offline   Reply With Quote
Old 26 September 2006, 18:40   #3
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,645
RIBase
Wouldnt' having slack tubes pass more stresses on to certain areas and less onto others? I can visualise more stress on extremities for example-and more stress on the hull/tube joins as there would be more of a tearing effect by the tubes as you landed/hit waves etc-something like having a flat tyre?

Correct me if I'm wrong here-it's just a theory.
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 26 September 2006, 18:48   #4
Member
 
Country: Other
Town: Oakley
Boat name: Zerstörer
Make: Ribcraft
Length: 5m +
Engine: Suzuki DF 140
MMSI: 235050131
Join Date: Jun 2003
Posts: 3,931
Nos,

Dunno the answer to your reply. But if you haven't got a gauge how do you know if you've got 6 PSI Sparkey. Is that hard or very hard or not quite so hard.
__________________
Biggles is offline   Reply With Quote
Old 26 September 2006, 18:52   #5
Member
 
Country: Ireland
Town: Ireland , cork
Boat name: liberty
Make: lencraft
Length: 6m +
Engine: outboard yamaha 150
Join Date: Jan 2006
Posts: 57
Quote:
Originally Posted by Nos4r2
Wouldnt' having slack tubes pass more stresses on to certain areas and less onto others? I can visualise more stress on extremities for example-and more stress on the hull/tube joins as there would be more of a tearing effect by the tubes as you landed/hit waves etc-something like having a flat tyre?

Correct me if I'm wrong here-it's just a theory.
Yes Nos2r4 , I follow your thinking.
if the tubes are correctly inflated then any impacts or stress will be distributed across a bigger surface area.
Also the rib will be easier to handle and safer as well as dryer to use as the hard tubes will deflect any spray out and down

sparkey
__________________
sparkey is offline   Reply With Quote
Old 26 September 2006, 18:53   #6
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,645
RIBase
Quote:
Originally Posted by sparkey
normal tube pressure is aprox 6 PSI.

it's not that high is it? I've never had a gauge but heard 2-4psi bandied about as normal. Always just pumped mine up hard enough that you just get that satisfying 'boing' sound when you slap them with a palm.
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 26 September 2006, 19:00   #7
Member
 
Country: Other
Town: Oakley
Boat name: Zerstörer
Make: Ribcraft
Length: 5m +
Engine: Suzuki DF 140
MMSI: 235050131
Join Date: Jun 2003
Posts: 3,931
But would tubes that wobble about when making progress be too soft. They aren't overly soft but nonetheless they ain't rock hard. Can we assume that rock hard to the touch are the best condition to have your tubes.
__________________
Biggles is offline   Reply With Quote
Old 26 September 2006, 19:04   #8
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,645
RIBase
Quote:
Originally Posted by Biggles
But would tubes that wobble about when making progress be too soft. They aren't overly soft but nonetheless they ain't rock hard. Can we assume that rock hard to the touch are the best condition to have your tubes.

I'd guess that wobbling is bad-though I'd have to inflate mine to more than my pump would allow to stop them moving completely.

I think we need Paul Tilley here.
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 26 September 2006, 19:30   #9
Member
 
Country: Other
Town: Oakley
Boat name: Zerstörer
Make: Ribcraft
Length: 5m +
Engine: Suzuki DF 140
MMSI: 235050131
Join Date: Jun 2003
Posts: 3,931
I'm sure the experts reply would be of value to all of us.
__________________
Biggles is offline   Reply With Quote
Old 26 September 2006, 19:57   #10
Member
 
Country: UK - Scotland
Town: Ayrshire
Boat name: Raven
Make: Ribcraft
Length: 5m +
Engine: 150 suzuki
MMSI: 235040525
Join Date: Aug 2006
Posts: 653
Quote:
Originally Posted by sparkey
normal tube pressure is aprox 6 PSI.
when it gets cold the air in the tubes contract so the tubes get soft so go ahead and re pump the tubes with the foot / electric pump...... not like a local dive club who used their dive bottle and burst the tubes.
Most modern ribs have safety overpressure valves that will open if the tubes are over pressurised.
Saw a rib tube gauge on ebay last week for small money. When I locate it again I will post the link here

Sparkey.

We haved dived for years with a leaky old Osprey 5.5 that goes down so fast, dive bottles are the only way to get the lost Volume in (just don't go daft) we have even made a connection for system-sorting the leak would obviously be better but it's turned into a bit of a game.
__________________

__________________
IBWET 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 23:52.


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