Reply
 
Thread Tools Search this Thread
 
Old 21 July 2016, 13:19   #11
Member
 
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Mercury
Length: 3m +
Engine: Suzuki Outboard/25/4
MMSI: 235074042
Join Date: Oct 2011
Posts: 3,464
I be been driving sibs for years the guys are right but if carrying a lot of weight you have to play with trim, usually I have mine on second hole up for a flat level ride but you have to play with it,
soft tubes drag a bit but not crucial but very low keel pressure will induce a concave hull and air collects causing a bubble of air to escape and can cause cavitation and loss off forward motion momentarally
20 hp will struggle and be at the edge with 5 people I would think, 7 your asking to win the lottery without a ticket
Nice to see you back gurnard.

Cheers
__________________

__________________
jeffstevens763@g is offline   Reply With Quote
Old 22 July 2016, 03:21   #12
Member
 
Country: UK - England
Town: Cornwall, UK
Make: Quicksilver 430HD
Length: 4m +
Engine: Mariner 20Hp 4s
Join Date: Jun 2016
Posts: 40
Jeff, thanks yet again for contributing. I think this thread has deviated a wee bit from what I hoped was my main point which is the nose digging in and impeded progress. When I moved the pin one hole out the prop did cavitate when giving it beans. That didn't happen prior to moving the pin.

From what you describe Jeff I think I'm back to where we kicked off, and I have been reading the gauge wrong, which would give me a keel about 60% of max pressure.

Regarding planing, I am quite frankly staggered it planed effortlessly with 5 up and if I had the trim right we'd have planed 7 up without too much drama. Admittedly at full throttle but I'm not expecting miracles and when I bought it I didn't expect it to plan so easily. the previous owner told me his 14 stone son had wakeboarded behind it and I didn't really believe that. I'm thinking its possible now.

I'm putting my money on keel pressure. I'll get out in it again this weekend and have a play.

Thanks everyone
__________________

__________________
T4Syncro is offline   Reply With Quote
Old 22 July 2016, 04:07   #13
Member
 
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Mercury
Length: 3m +
Engine: Suzuki Outboard/25/4
MMSI: 235074042
Join Date: Oct 2011
Posts: 3,464
Quote:
Originally Posted by T4Syncro View Post
Jeff, thanks yet again for contributing. I think this thread has deviated a wee bit from what I hoped was my main point which is the nose digging in and impeded progress. When I moved the pin one hole out the prop did cavitate when giving it beans. That didn't happen prior to moving the pin.

From what you describe Jeff I think I'm back to where we kicked off, and I have been reading the gauge wrong, which would give me a keel about 60% of max pressure.

Regarding planing, I am quite frankly staggered it planed effortlessly with 5 up and if I had the trim right we'd have planed 7 up without too much drama. Admittedly at full throttle but I'm not expecting miracles and when I bought it I didn't expect it to plan so easily. the previous owner told me his 14 stone son had wakeboarded behind it and I didn't really believe that. I'm thinking its possible now.

I'm putting my money on keel pressure. I'll get out in it again this weekend and have a play.

Thanks everyone
hi mate i think you have it with the keel pressure as the rigidity of the boat will not be there so causing it to banana as the engine pushes down on the top of the transom if that makes sense hence digging in, but if as you say you do plane with seven up then thats a good set up and a quick fix with the correct pressure lets us know how you get on.

cheers
__________________
jeffstevens763@g is offline   Reply With Quote
Old 22 July 2016, 04:09   #14
Member
 
Country: UK - England
Town: Cornwall, UK
Make: Quicksilver 430HD
Length: 4m +
Engine: Mariner 20Hp 4s
Join Date: Jun 2016
Posts: 40
Ches Jeff, I'll report back for sure. Thanks mate
__________________
T4Syncro is offline   Reply With Quote
Old 22 July 2016, 14:46   #15
Member
 
chriswood's Avatar
 
Join Date: Apr 2014
Posts: 94
Hi. I had exactly the same problem until I realised that the keel pressure dropped when I put the boat in the water. Also had to invest in a better pump to get the right pressure in the keel. Now top up after 5 mins and its made all the difference!! Hope that helps
__________________
chriswood is offline   Reply With Quote
Old 23 July 2016, 11:51   #16
Member
 
The Gurnard's Avatar
 
Country: UK - Scotland
Town: Stirling
Boat name: The Gurnard
Make: Quicksilver
Length: 4m +
Engine: mariner 25hp 2s
Join Date: Jul 2013
Posts: 978
Quote:
Originally Posted by T4Syncro View Post

From what you describe Jeff I think I'm back to where we kicked off, and I have been reading the gauge wrong, which would give me a keel about 60% of max pressure.
Yup.. after reading what you are saying..if you have 60% air in the tubes as well as the keel because you were reading the gauge wrong....Im surprised it planed at all. As mentioned mine isnt so pressure sensitive ..I just give it the "thump test" to check its pressure.. and its the exact same boat as yours .. but that difference in tube and keel pressure would matter...it would feel soft


im sure you will find it goes a lot better with better pressure
__________________
The Gurnard is offline   Reply With Quote
Old 24 July 2016, 04:19   #17
Member
 
Country: UK - England
Town: Cornwall, UK
Make: Quicksilver 430HD
Length: 4m +
Engine: Mariner 20Hp 4s
Join Date: Jun 2016
Posts: 40
Thanks again all. I'd completely forgot that the sea temp will have that effect. By the way, what pump did you buy?
__________________
T4Syncro is offline   Reply With Quote
Old 24 July 2016, 12:42   #18
Member
 
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Mercury
Length: 3m +
Engine: Suzuki Outboard/25/4
MMSI: 235074042
Join Date: Oct 2011
Posts: 3,464
I use a bravo but my boat stays inflated some have had issues with them especially those pumping up each time they go out but I guess there's good and bad in all makes. The one I have you set the pressure and wait till blown up and it cuts out.
Might be telling you to suck eggs remember to inflate equally all compartments because if not the baffles get strained and risk bypassing. And the chamber with least air in is more pressure sencertive to cold.

Cheers
__________________
jeffstevens763@g is offline   Reply With Quote
Old 24 July 2016, 15:08   #19
Member
 
Country: UK - England
Town: South West
Length: 4m +
Join Date: Apr 2007
Posts: 31
I bought a pressure gauge for mine, it's a sevylor one (they make inflatable kayaks etc) comes with a few different nozzles for different valves and is cheap compared to some.
__________________
roody262 is offline   Reply With Quote
Old 24 July 2016, 18:32   #20
Member
 
chriswood's Avatar
 
Join Date: Apr 2014
Posts: 94
Hi. I bought a quicksilver stirrup type pump with a in-line pressure gauge. Purchased via eBay from Pacer Marine. Cost 30. Comes with all different attachments for all types of valve. The manufacturers foot pump provided with the boat didn't provide enough pressure for the keel but the quicksilver is perfect to keep in the boat and top up while on the water.
__________________

__________________
chriswood 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 11:18.


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