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06-09-2018, 11:19 PM
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#1
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Senior Member
City: Norfolk, VA
Vessel Model: Bayliner 3870
Join Date: Jul 2015
Posts: 308
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My Dinghy isn't hard enough!
But seriously, I stumbled upon a killer deal on an outboard motor for the roll up dinghy that came with my boat! And after one use I'm disappointed....
Past part throttle, the transom starts to fold in and the floor starts to cave in? Is this typical or is there something I can do to stiffen this boat up? It's a joke this thing is rated for 5 hp
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06-09-2018, 11:30 PM
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#2
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Guru
City: SoCal and Vancouver Island
Vessel Name: Tortuga
Vessel Model: Nordhavn 63
Join Date: Aug 2016
Posts: 748
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No that’s not typical. Assuming it’s a decent quality boat, you don’t have enough pressure in it. It’s take a LOT of pumping to get an inflatable boat to the correct pressure. Once you do that, it will be very rigid.
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06-10-2018, 01:25 AM
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#3
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Guru
City: Cape May, NJ
Vessel Name: Irish Lady
Vessel Model: Monk 36
Join Date: Dec 2007
Posts: 4,947
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Just keep the throttle back. Its not going to plane no matter how much air you put in the roll-up dinghy. So instead of 4.5 knots you only go 4.0. No big deal.
__________________
Archie
Irish Lady
1984 Monk 36 Hull #46
Currently in Cape May, NJ
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06-10-2018, 10:12 AM
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#4
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Guru
City: Miami Florida
Vessel Name: Possum
Vessel Model: Ellis 28
Join Date: Aug 2011
Posts: 5,299
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I agree with Guy, sounds like it needs more air. I want to use the phrase tight as a drum. There are pressure gauges available but you really shouldn’t need one. The boat I had with an inflatable floor needed the floor inflated to a much higher pressure than the tubes. The foot pump had two outlets, one low pressure for filling the tubes and one high pressure for topping off the floor.
__________________
Parks Masterson
Retired from Hopkins-Carter Marine Supply
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06-10-2018, 10:40 AM
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#5
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Senior Member
City: Lottsburg, Va
Vessel Name: Amazing Grace
Vessel Model: Ocean Alexander 52 Sedan
Join Date: Dec 2007
Posts: 318
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If none of the above works, you could try putting one of those blue pills in each chamber. Might help.
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06-10-2018, 10:40 AM
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#6
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TF Site Team
City: Saltspring Island
Vessel Name: Retreat
Vessel Model: C&L 44
Join Date: Nov 2007
Posts: 5,656
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Measure the surface area of the top surface of the pump in square inches.
150/4=37.5
If you weigh 150# and your pump has 37.5 sq in surface area, you will get 4 psi.
adjust the math for your weight and your surface area. The target for an inflatable dinghy is 4 psi. Floors may want more.
In my case, my inflatables always want more than I can give them, so I call upon a nearby heavy person to stand on the pump for the last few strokes.
__________________
Keith
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06-10-2018, 11:03 AM
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#7
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Senior Member
City: Kingsville, MD
Vessel Name: Harmony
Vessel Model: Pacemaker 1990 37' Convertible
Join Date: Mar 2016
Posts: 287
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Quote:
Originally Posted by bnoft
If none of the above works, you could try putting one of those blue pills in each chamber. Might help.
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After 4 hours you will need to see a doctor.
__________________
Any day aboard is a good day.
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06-19-2018, 02:31 PM
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#8
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Senior Member
City: Norfolk, VA
Vessel Model: Bayliner 3870
Join Date: Jul 2015
Posts: 308
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Ha! Nice!
I've kept the speed down and it helps. I'll pump some more air into it and see if that does anything. It sounds like I'm way under inflated.
Thanks!
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06-22-2018, 06:20 PM
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#9
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Guru
City: Bethesda, MD
Vessel Name: Solstice
Vessel Model: Grand Banks 47 Eastbay FB
Join Date: Feb 2018
Posts: 2,164
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West Marine used to sell some folding trim tabs that mounted to the transom and rode just under the stern tips of the pontoons. Made a bit of a flat surface there to help prevent the pontoons from digging down into the water. Worked surprisingly well at reasonable speeds.
But it made it a white-knuckle experience taking a 9' dinghy up on plane with an 8hp 2-stroke on it. Fast as Hell and felt like it would snap your ass out of there in a heartbeat if you didn't steer it EXACTLY right. You wore than kill-switch leash because you KNEW it would toss you out and come back to run you over!
It looks like they're no longer available? Shame, had I known I would have taken them off the old one when I got rid of it.
https://www.westmarine.com/buy/west-...-boat--7780182
__________________
-- Bill Kearney
2005 Eastbay 47 FB - Solstice, w/Highfield CL360 tender
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06-22-2018, 10:03 PM
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#10
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Guru
City: Concrete Washington State
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 18,738
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99,
Just looks like more drag to me.
Forget all those rubbers and get a dinghy like this sized to your boat.
__________________
Eric
North Western Washington State USA
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06-22-2018, 10:26 PM
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#11
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TF Site Team
City: Saltspring Island
Vessel Name: Retreat
Vessel Model: C&L 44
Join Date: Nov 2007
Posts: 5,656
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These: https://www.westmarine.com/search?Ntt=smart+tabs
They made an out of control Caribe 10 powered with a Yamaha 2 cycle 20 just rise up onto a plane with no fuss, no pointing the bow at the sky.
__________________
Keith
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06-23-2018, 09:31 AM
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#12
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Guru
City: Miami Florida
Vessel Name: Possum
Vessel Model: Ellis 28
Join Date: Aug 2011
Posts: 5,299
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Quote:
Originally Posted by koliver
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The way to cure a boat that wants to point at the sky before it will go on plane is not a tiller extension, it’s adding some flat surface aft of the transom. The Smart Tabs do that very nicely.
My skiff would climb for the sky also until I installed tabs fixed flush with the bottom.
__________________
Parks Masterson
Retired from Hopkins-Carter Marine Supply
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06-23-2018, 09:50 AM
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#13
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Senior Member
City: tallahassee
Vessel Model: 1979 Mainship 34
Join Date: Aug 2016
Posts: 415
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Can handle a 5hp outboard but I have a trolling motor on mine for now.
9.4 Sun dolphin/West marine Watertender ~ $500
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06-23-2018, 10:27 AM
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#14
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Guru
City: Cypress Landing Marina (NC)
Vessel Name: Heron (2)
Vessel Model: '88 Cape Dory 28 Flybridge #115
Join Date: Nov 2014
Posts: 1,305
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Buy a Sevylor High pressure 12v. pump. Set the resssure (3.6 for my Quicksilver) and moments later it shuts off at the perfect inflation point. 10psi for the floor easily handled too. Inflates my Drop stitched, high pressure Sea Eagle Kayak in minutes too. Manual pumping is a chore...Especially if you have to hit 10 psi. Under $50 on Amazon. Great little pump..
https://www.amazon.com/Sevylor-15-PS...s=sevylor+pump
Getting ready to order a Portland Pudgy though...I've had it with Blow-ups..
http://www.portlandpudgy.com/
__________________
Steve
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06-25-2018, 01:34 PM
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#15
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Senior Member
City: Grenadines
Join Date: Dec 2017
Posts: 167
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I've had inflatable dinghies since the early 70's and have never had that problem with any of them unless they are underinflated. I keep mine nearly as hard as a basketball, which prevents any movement at the seams and actually makes it much more resistant to punctures, both of which add to longevity.
That said, I've never owned a cheap inflatable or a RIB. My last two have been the Zodiac Classic Mark I, the first of which lasted almost 10 years of hard daily use as our tender, with a 15hp 4 stroke engine. We are a year into our second one w/o any problems at all. As a charter boat, it is important to have a good dink, as it gets much harder use than a dink for a pleasure boat.
Try pumping it up a lot more.
__________________
"Believe me, my young friend, there is nothing -- absolutely nothing -- half so much worth doing as simply messing about in boats."
-Wind in the Willows by Kenneth Grahame
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06-25-2018, 07:07 PM
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#16
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Veteran Member
City: Chicago
Join Date: Nov 2017
Posts: 28
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I have an 8’ loves the 9.9 I put on it. Can be scary certainly overpowered.
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06-25-2018, 09:10 PM
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#17
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Guru
City: Long Beach, CA
Vessel Name: Aquarius
Vessel Model: Californian 55 CPMY
Join Date: May 2018
Posts: 719
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Quote:
Originally Posted by HopCar
I agree with Guy, sounds like it needs more air. I want to use the phrase tight as a drum. There are pressure gauges available but you really shouldn’t need one. The boat I had with an inflatable floor needed the floor inflated to a much higher pressure than the tubes. The foot pump had two outlets, one low pressure for filling the tubes and one high pressure for topping off the floor.
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Is it possible that the dinghy was designed to have a hard floor or an inflatable floor?
__________________
Aquarius 1991 Californian 55 CPMY Long Beach CA
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