Inflating

[GuyC]

Originally Posted by Tommy c

It also says the boats supplied foot pump can't over inflate the inflatable. What do you think?

I don't really understand how the advert can say that as you have three different items all requiring different pressures - tubes, keel and floor. It's a pretty clever pump if it knows the difference between them.

[GuyC]

Originally Posted by Bucksribster

I have a question. How can a gague on a pump work if the valve shuts off the air when you stop pumping?

When you first start pumping the pressure in the pump is less than the pressure in the tube. As soon as the pump pressure reaches the same as the tube pressure the non return valve will open and air will flow from the pump to the tube. The gauge records the pressure on the pump side which will be the same as in the tube.

If you stamp on the pump, you will briefly be able to increase the pressure in the pump to above that of the tube but it will very quickly equalise by transferring that pressure to the tube via the non return valve. You can often see this on the gauge when it briefly increases and then settles down to a slightly lower figure.

[Tommy c]

Originally Posted by GuyC

I don't really understand how the advert can say that as you have three different items all requiring different pressures - tubes, keel and floor. It's a pretty clever pump if it knows the difference between them.

Yeah I got thinking about it after I posted.
So if it can't over inflate the tubes at 3.something, then the keel and floor must end up under inflated?

[warder54]

Bucksribster: you stop pumping when it shows correct pressure. But yes, you need a separate guage to check when on the water.

[Fenlander]

>>>then the keel and floor must end up under inflated?

Yep. To do air floors a SIB needs a dual stage pump that either has a slider or a removable plug to change to HP mode. A standard low pressure pump for normal tube pressure will not pump to air floor pressure. Even the correct dual stage one will have you giving up if you haven't a gauge to show how far you've got because way before the floor is up to pressure you'll be thinking it must be enough.

That's why 99% of us who daily inflate with an air floor use an electric pump.

[Tommy c]

Originally Posted by Fenlander

>>>then the keel and floor must end up under inflated?

Yep. To do air floors a SIB needs a dual stage pump that either has a slider or a removable plug to change to HP mode. A standard low pressure pump for normal tube pressure will not pump to air floor pressure. Even the correct dual stage one will have you giving up if you haven't a gauge to show how far you've got because way before the floor is up to pressure you'll be thinking it must be enough.

That's why 99% of us who daily inflate with an air floor use an electric pump.

When I got the sib I inflated it with the foot pump just to check it out but noticed the keel put a 'hump' in the air deck.
If the air deck is correctly inflated to its high pressure, will that force the keel down and eliminate the 'hump'?

[Fenlander]

Yes it should. Often only rising towards the very last bit of full high pressure brings an air floor to 100% the correct shape.

You may see a very gentle curve where the keel pushes up but it shouldn't be a real ridge/hump.

[jeffstevens763@g]

Originally Posted by Tommy c

When I got the sib I inflated it with the foot pump just to check it out but noticed the keel put a 'hump' in the air deck.
If the air deck is correctly inflated to its high pressure, will that force the keel down and eliminate the 'hump'?

some floors have a convex shape only slightly our sit resicraft has. but if its a massive hump then pump the floor first to pressure then the keel. the keel just forms the hull shape for a streamlined shape to be honest your running a 2.5 hp i believe so your at displacement speed not as critical get an electric pump far easier

sorry david you beat me cheers

[Mikefule]

I am on my third SIB and before that I used many RIBs and SIBs including doing a proper boat handling course on the sea. Never once have I used a gauge, I was never instructed to use a gauge, I've never never had a problem caused by over or under inflation.

I pump it up until the sound changes when I slap it with my hand. I top it up a bit after launching into cold water. I let a bit out if it's in direct hot sunlight.

[jeffstevens763@g]

hope this link works




https://pumpupboats.com/

[jeffstevens763@g]

double post

[smallribber]

Originally Posted by jeffstevens763@g

Worth every penny

https://www.decathlon.co.uk/electric...d_8387582.html

Best pump there is in my Opinion... Buy two gets the job done very quick and the connectors hold in well

[Tommy c]

Fitted this to the foot pump. Don't know how accurate it really is because it only measures on each stroke as the check valve opens so the needle bounces a lot.
The foot pump has 2 chambers. One for low pressure with high volume and the other is low volume with high pressure.
I struggled to get much over 3 on the low pressure and the push fit kept blowing off on high pressure at 8
I also can't believe how firm the tubes are at 3psi

[Uh Oh]

Hi Jeff

I've got a similar issue now with a rib. Did you have to get a separate adaptor to fit your inflation valve please?

[jeffstevens763@g]

Originally Posted by Uh Oh

Hi Jeff

I've got a similar issue now with a rib. Did you have to get a separate adaptor to fit your inflation valve please?

No mate the one with the pump fitted both boats mercury and excel

[Uh Oh]

Originally Posted by jeffstevens763@g

No mate the one with the pump fitted both boats mercury and excel

Cheers mate

[benhben]

Ive got a Bravo GE BP pump. Seems to work ok but is incredibly noisy. I would be fairly uneasy using this in a lake district car park at risk of pising everyone off!

https://www.force4.co.uk/item/Bravo/GE-BP-12V-Pump/W34

Anyone else had this? Wondering if the Itwit would be a bit more subtle.

EDIT. Just noticed the OP is from the same place as me! Hi there!