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06-08-2013, 08:01 PM
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#1
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Guru
City: Juno Beach, FL
Vessel Name: Takes Two
Vessel Model: Defever 49 RPH
Join Date: Jul 2011
Posts: 500
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Trick Question - RIB
I will offer a box of chocolates to the first best answer:
Friday I leave Lake Havasu at 6:30 am Pacific time, temp is 89 degrees and the RIB's tubes are firm. Trailer has just been serviced with new tires and repacked wheel bearings.
After approximately 550 miles I arrive in Alburquerque NM at 4:30pm Mtn Time, temp is 90 degress RIB's tubes are firm. 
Today, Saturday I leave Alburquerque at 6:15am temp is 70 degress and RIB's tubes are firm. 
At approximately 2:30pm after driving 450 miles I am 75 miles west of Oklahoma City, OK temp is 75 degrees wind is out of the south steady at 24mph and I notice through the rear view mirror that the RIB's tubes are soft and flexing in the wind. I stop to inflate the tubes.
At approx. 4:00pm Central time I arrive in Oklahoma City and tubes have softened some but not alot. 
What gives and causes the fluctuation and will the tubes change again in the 580 mile drive tomorrow to Pickwick Lake MS ?????
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06-08-2013, 08:26 PM
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#2
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Guru
City: Vallejo, California
Vessel Name: Mahalo Moi
Vessel Model: 1986 Grand Banks 42 Classic
Join Date: Jun 2008
Posts: 2,080
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Altitude. Pressure differences. Ever see a bag of potato chips at 12,000 feet? Send me a PM and I'll give you my address for the candy!
__________________
Ray
"Mahalo Moi"
1986 GB-42 Classic
ΜΟΛΩΝ ΛΑβΕ
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06-08-2013, 08:57 PM
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#3
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Guru
City: Sidney BC Canada
Vessel Name: RochePoint
Vessel Model: 1985 Cheer Men PT38 Sedan
Join Date: Apr 2009
Posts: 1,726
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Quote:
Originally Posted by Giggitoni
Altitude. Pressure differences. Ever see a bag of potato chips at 12,000 feet? Send me a PM and I'll give you my address for the candy!
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06-08-2013, 09:02 PM
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#4
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Senior Member
City: Benicia CA
Join Date: Mar 2012
Posts: 499
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Yes, it will keep changing for the same reason stated above.
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06-08-2013, 09:20 PM
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#5
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Guru
City: Longboat Key, FL
Vessel Name: Bucky
Vessel Model: Krogen Manatee 36 North Sea
Join Date: Oct 2009
Posts: 5,189
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Easy. While leaving Lake Havasu the tubes were rigid from the boat's proximity to water with inflation retained by excited readiness. The hope for virgin water stimulation maintained PSI through the day and the over-nighter at Albuquerque, and when it became obvious that, after 1000 miles of no water in sight, there was going to be no play today either, well......
Hose her down before going through OKC and when 40 starts following the Arkansas River a while, she'll stop loosing air. Once she smells the Mississippi, they'll steadily stiffen-up all the way to Pickwick.
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06-08-2013, 09:46 PM
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#6
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Guru
City: Juno Beach, FL
Vessel Name: Takes Two
Vessel Model: Defever 49 RPH
Join Date: Jul 2011
Posts: 500
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Giggitoni well done but my warp sense of whatever also liked Heal Hustler's comment, however after much deliberation  my result is Giggitoni.
The PM is on its way. 
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06-08-2013, 10:39 PM
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#7
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Guru
City: Vallejo, California
Vessel Name: Mahalo Moi
Vessel Model: 1986 Grand Banks 42 Classic
Join Date: Jun 2008
Posts: 2,080
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Please, I'm not looking for chocolate, send it to HH! I'd rather have you join us in the Delta or SF Bay Area soon.
__________________
Ray
"Mahalo Moi"
1986 GB-42 Classic
ΜΟΛΩΝ ΛΑβΕ
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06-08-2013, 11:10 PM
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#8
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Guru
City: Hotel, CA
Join Date: Sep 2011
Posts: 8,323
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As an aside to your RIB story a friend of mine in the Bay Area bought a brand new Alegro bus a couple years ago and took it to Pismo Beach for the break in trip. Everything was perfect except the queen size mattress, they hated it. Replaced it with a sleep number air mattress and went on another test trip and loved it.
Their next trip they left Los Gatos and drove straight to Ebbets Pass around 8,000 feet elevation. His wife went to get the camera out of the bedroom and he almost wrecked the bus when she screamed at the top of her lungs. They deflate the mattress before climbing mountain passes now.
__________________
Craig
It's easier to fool people than to convince them that they've been fooled - Mark Twain
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06-08-2013, 11:18 PM
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#9
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Guru
City: San Diego
Vessel Name: Circuit Breaker
Vessel Model: 2021..22' Duffy Cuddy cabin
Join Date: Oct 2007
Posts: 6,691
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Quote:
Originally Posted by CPseudonym
Everything was perfect except the queen size mattress, they hated it. Replaced it with a sleep number air mattress and went on another test trip and loved it.
Their next trip they left Los Gatos and drove straight to Ebbets Pass around 8,000 feet elevation. His wife went to get the camera out of the bedroom and he almost wrecked the bus when she screamed at the top of her lungs. They deflate the mattress before climbing mountain passes now.
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Great story, Craig! I can just see it happening! 
__________________
Done with diesel power boats! Have fallen in love with all electric!
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06-09-2013, 12:06 AM
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#10
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Guru
City: Vallejo, California
Vessel Name: Mahalo Moi
Vessel Model: 1986 Grand Banks 42 Classic
Join Date: Jun 2008
Posts: 2,080
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My comment on the potato chip bag was from experience. I was traveling to a job in Colorado and had a bag of snacks on the passenger seat next to me. I was east-bound on I-70 just about to enter the Eisenhower Tunnel near Silverthorne (about 12,000 feet) when the bag of chips let go. I had chips all over the dash and the noise completely shook me up. I pulled over at the Loveland ski area on the other side of the tunnel. I was laughing and eating chips at the same time. Quite a day!
__________________
Ray
"Mahalo Moi"
1986 GB-42 Classic
ΜΟΛΩΝ ΛΑβΕ
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06-09-2013, 12:18 AM
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#11
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Guru
City: Hotel, CA
Join Date: Sep 2011
Posts: 8,323
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That's funny Ray! I'd a peed myself if that happened to me.
__________________
Craig
It's easier to fool people than to convince them that they've been fooled - Mark Twain
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06-09-2013, 12:32 AM
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#12
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TF Site Team
City: California Delta
Vessel Name: FlyWright
Vessel Model: 1977 Marshall Californian 34 LRC
Join Date: Apr 2008
Posts: 13,715
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Good thing you weren't a pilot!
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06-18-2016, 02:47 AM
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#13
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Guru
City: Sydney
Vessel Name: Sojourn
Vessel Model: Integrity 386
Join Date: Oct 2011
Posts: 12,916
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Quote:
Originally Posted by FlyWright
Good thing you weren't a pilot!
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Airlines warn about deflating(or was it inflating) the seat lumbar support when landing. Can the seat explode?
__________________
BruceK
2005 Integrity 386 "Sojourn"
Sydney Australia
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06-18-2016, 06:14 AM
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#14
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Guru
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 26,852
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Internal temp can be pretty important too.
Blow a rib up in direct sun, let it sit, top it off, toos it in cool to cold water in the shade anf the tubes deflate quite a bit too.
I would guess 20 degrees and sunshine intensity drop would have an effect more than five hundred or so feet of altitude change....8000 maybe. if you went through a high pass and it vented then its a possibility too.
The new gas cans also....they seem to be pretty dangerous the way they deform so badly. I hope the emergency vent kicks in before mine gets any rounder some day and decides plastic isn't THAT strong. 
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06-18-2016, 11:28 AM
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#15
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Veteran Member
City: BC
Join Date: Jun 2016
Posts: 79
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Quote:
Originally Posted by Giggitoni
My comment on the potato chip bag was from experience. I was traveling to a job in Colorado and had a bag of snacks on the passenger seat next to me. I was east-bound on I-70 just about to enter the Eisenhower Tunnel near Silverthorne (about 12,000 feet) when the bag of chips let go. I had chips all over the dash and the noise completely shook me up. I pulled over at the Loveland ski area on the other side of the tunnel. I was laughing and eating chips at the same time. Quite a day!
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I have had chips and a pop can once even explode on me in the helicopters.
New rule on the list is don't fly with a can of coke....what a huge mess....
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06-18-2016, 11:42 AM
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#16
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TF Site Team
City: California Delta
Vessel Name: FlyWright
Vessel Model: 1977 Marshall Californian 34 LRC
Join Date: Apr 2008
Posts: 13,715
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Quote:
Originally Posted by BruceK
Airlines warn about deflating(or was it inflating) the seat lumbar support when landing. Can the seat explode?
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Bruce, The problem arises when a sealed air chamber like an inflatable lumbar or neck pillow is taken to an area of lower atmospheric pressure. This can be via a mountain climb or an airplane climb. It's worse in unpressurized planes but can still be a problem in a pressurized aircraft. As the surrounding air pressure decreases, the pressure differential increases between the trapped gas and the surrounding air. The pillow/bag of chips/intestinal gasses will be released if the differential grows too large for the vessel holding the trapped gas.
Take a water bottle as an example of the effects on descent. At altitude, you drink half the water and reseal the bottle. When descending, the bottle will crush in as the air pressure around it increases causing a pressure differential.
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08-28-2016, 10:34 PM
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#17
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Guru
City: Southwest MI
Vessel Name: Sobelle
Vessel Model: C-Dory 22 Cruiser
Join Date: Mar 2015
Posts: 1,214
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I was towing my RIB one summer day. The temp was in the 90's and the tubes were firm. Drove through a summer thunderstorm and the temp dropped 20 degrees. Noticed the tubes were all floppy. Half hour later the temp was back up and the tubes were firm again.
I kept an eye one the tubes in the rearview mirror as we drove. I've had to stop on the side of the road at times to adjust the pressure (both up and down depending on the situation).
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