Reply
 
Thread Tools Search this Thread
 
Old 28 June 2011, 10:40   #11
Member
 
Burtox's Avatar
 
Country: UK - England
Town: Christchurch
Boat name: Sweet Chilli
Make: Ribcraft 585/Wetline
Length: 6m +
Engine: Honda 90HP Yam 4HP
MMSI: 235084532
Join Date: Jan 2011
Posts: 161
Quote:
Originally Posted by Pikey Dave
......and this years nominations for the Darwin awards are........
Oh no don't tell me that the pikies can afford boats as well as new transits and caravans. What has the world come too
__________________

__________________
Is it Friday yet????
Burtox is offline   Reply With Quote
Old 28 June 2011, 11:00   #12
Member
 
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
Safety notwithstanding, I doubt you'd be able to tell if you're getting cavitation from a handheld video camera on a through-hub exhaust outboard.

Cavitation is caused by the lower pressure area on the prop blades turning the liquid to a gas. The collapse of the resulting bubbles is what causes damage.

With a through-hub exhaust, there is so much gas being put into the water from the engine exhaust that you'd never see the formation of the smallish bubbles on the prop blades.

My $.02;

jky
__________________

__________________
jyasaki is offline   Reply With Quote
Old 28 June 2011, 13:00   #13
RIBnet supporter
 
Pikey Dave's Avatar
 
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 7,579
RIBase
Quote:
Originally Posted by Burtox

Oh no don't tell me that the pikies can afford boats as well as new transits and caravans. What has the world come too
Do you want to buy a dog??

ee lad, tha can't educate pork
__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4: See rule#5
Pikey Dave is offline   Reply With Quote
Old 28 June 2011, 18:02   #14
Member
 
Burtox's Avatar
 
Country: UK - England
Town: Christchurch
Boat name: Sweet Chilli
Make: Ribcraft 585/Wetline
Length: 6m +
Engine: Honda 90HP Yam 4HP
MMSI: 235084532
Join Date: Jan 2011
Posts: 161
Quote:
Originally Posted by Pikey Dave View Post
Do you want to buy a dog??

ee lad, tha can't educate pork
Yes I'm in the market but no more than ten bob
__________________
Is it Friday yet????
Burtox is offline   Reply With Quote
Old 30 June 2011, 19:37   #15
Member
 
Country: UK - England
Town: Southampton
Boat name: Ginger
Make: Avon SR4
Length: 4m +
Engine: 30hp yamaha
Join Date: Jun 2010
Posts: 207
Impressive shots but really not something to repeat. Props are seriously dangerous.
On a lighter note, the first run you doesnt look to cavitate too bad, most of the bubbles look to be from the exhaust. The second run looks to cavitate a bit - take it that's when he opened the taps? A bit of slip under hard acceleration is likely normal however.
Still, a good set of concept shots, but really do find a less dangerous way of repeating it if you must - I work just up the road from you and don't fancy sewing your arm back on!
__________________
rik_elliott is offline   Reply With Quote
Old 01 July 2011, 08:36   #16
Member
 
Country: Other
Town: Rosas
Boat name: Conqueror
Make: Valiant
Length: 7m +
Engine: Outboard 150hp Merc
Join Date: Dec 2010
Posts: 541
Send a message via Skype™ to Courageous
Hi Burtox - I'm probably looking for further info for me as much as anything here but your anti cav plate looks quite high up above the keel on your boat. Is that so or is it an optical delusion? I ask mainly because I am having problems with my setup at the moment with ventilation for that very reason. Yours doesn't seem to be affected by that from the video shots out of the water.
__________________
Courageous is offline   Reply With Quote
Old 12 July 2011, 18:48   #17
Member
 
Burtox's Avatar
 
Country: UK - England
Town: Christchurch
Boat name: Sweet Chilli
Make: Ribcraft 585/Wetline
Length: 6m +
Engine: Honda 90HP Yam 4HP
MMSI: 235084532
Join Date: Jan 2011
Posts: 161
I have a feeling that the prop is spaced too far from the gear box. I will reduce the thickness off the spacer and increase the washers thickness behind the castlelated securing nut. This mod should reduce the exhaust gasses escaping in front of the prop.

I also agree that the engine could go down another bolt hole as it does cavitate whilst doing a tight turn. Also the cavitation sound worse when I am travelling in the same direction as the waves.

Thanks you for all your comments.
__________________

__________________
Is it Friday yet????
Burtox 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 14:22.


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