SoCal Jet Boats

Tech Talk => Jet Pumps => Topic started by: cpmaz77 on August 12, 2015, 11:17:55 AM

Title: Porposing when you put your foot in it.
Post by: cpmaz77 on August 12, 2015, 11:17:55 AM: Hi Every one. Awesome web site! I hope some one can lead me in the right direction. I picked up this Southwind cruiser 20'. Runs great BBF with a Berkeley Pump. About 15sec after I put my foot in it the nose starts bouncing and you have to let off and get it back in the water. It has a manual place diverter but no ride plates. I have had a few jets in the past but never came across this problem. Any advise would be greatly appreciated!

Thanks!
C
Title: Re: Porposing when you put your foot in it.
Post by: GT Jets on August 12, 2015, 11:46:29 AM: Quote from: cpmaz77 on August 12, 2015, 11:17:55 AM
Hi Every one. Awesome web site! I hope some one can lead me in the right direction. I picked up this Southwind cruiser 20'. Runs great BBF with a Berkeley Pump. About 15sec after I put my foot in it the nose starts bouncing and you have to let off and get it back in the water. It has a manual place diverter but no ride plates. I have had a few jets in the past but never came across this problem. Any advise would be greatly appreciated!

Thanks!
C

Trim down or install a blower.

GT

Sent from my SCH-I545 using SoCal Jet Boats mobile app
Title: Re: Porposing when you put your foot in it.
Post by: jimpen on August 12, 2015, 11:55:34 AM: Quote from: GT Jets on August 12, 2015, 11:46:29 AM
Trim down or install a blower.

GT

Sent from my SCH-I545 using SoCal Jet Boats mobile app
. X2 most likely under powered.

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Title: Re: Porposing when you put your foot in it.
Post by: Steve-O on August 12, 2015, 06:46:01 PM: I had a mid 80's 19' Howard Sport Jet. Powered by Gale Banks twin turbo BBC. Same problem and this thing had plenty of power. Just my opinion, but I think it's a hook on the bottom of the boat. Also my bro-in-law has a 95' 21' Ultra jet with open bow. Stock 454 power and same problem too. Even at regular cruising speed on glass smooth water it porpoises. Just my opinion, but definitely think it's a hook in the hull.

Steve-O
Title: Re: Porposing when you put your foot in it.
Post by: jimpen on August 12, 2015, 06:57:37 PM: Yeah I heard of guys using tabs to stop it. Not real sure just dealt with a buddies 21 with the same problem. We never did get it right.

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Title: Re: Porposing when you put your foot in it.
Post by: cpmaz77 on August 12, 2015, 07:03:02 PM: Thanks guys.. all this info helps!
Title: Re: Porposing when you put your foot in it.
Post by: jet fever on August 12, 2015, 10:27:14 PM: What is it with these Southwind dc doing that.

Good luck my buddy tried pump wedge trim plates hull trim tabs removed electronic Jetovater installed place diverter never stopped it.
Title: Re: Porposing when you put your foot in it.
Post by: GT Jets on August 12, 2015, 10:38:10 PM: Quote from: jet fever on August 12, 2015, 10:27:14 PM
What is it with these Southwind dc doing that.

Good luck my buddy tried pump wedge trim plates hull trim tabs removed electronic Jetovater installed place diverter never stopped it.

Too much center strake.

They need a ride plate to rock back on.

JMHO

GT
Title: Re: Porposing when you put your foot in it.
Post by: jet fever on August 13, 2015, 01:24:23 AM: Man we had one trim tabs off transom ride plate off pump area still did it. Great boat but sure seems like a common occurance
Title: Re: Porposing when you put your foot in it.
Post by: JARVIS on August 13, 2015, 01:40:17 AM: Quote from: GT Jets on August 12, 2015, 10:38:10 PM
Too much center strake.

They need a ride plate to rock back on.

JMHO

GT

i heard the same thing recently....well, sort of. lifting strakes apparently go too far back.... to remove or reduce looks like a bit of work to me....
Title: Re: Porposing when you put your foot in it.
Post by: cpmaz77 on August 13, 2015, 06:04:51 AM: Im gonna try a few of ur suggestions as the Southwind name has some sentiment in my family..but the pocket book only runs so deep..lol...thanks again everyone!
Title: Re: Porposing when you put your foot in it.
Post by: JARVIS on August 13, 2015, 10:27:16 AM: I'll take a blind shot here....

I know they make hull extension for some stand up jetskis, perhaps some can be made and mounted on the Southwind hull? Or maybe a ride plate the spans the width between lifting strakes near keel...? ???
Title: Re: Porposing when you put your foot in it.
Post by: cpmaz77 on September 08, 2015, 05:04:56 PM: Hey. I just wanted to thank every one who gave some hints as to fix this problem. I picked up some trim-N-step trim tabs from a fellow member, installed them and I ran it today at Ellsinore and she ran perfect! no more porpoise. Thanks again guys!
Title: Re: Porposing when you put your foot in it.
Post by: bubblin_hallett on September 08, 2015, 06:55:36 PM: Right on man that's awesome! Kudos to the guys who contributed!!

Floating through life like I'm on my boat with a beer in my hand!!
Title: Re: Porposing when you put your foot in it.
Post by: JARVIS on September 08, 2015, 07:15:15 PM: any pics of install?
Title: Re: Porposing when you put your foot in it.
Post by: cpmaz77 on September 08, 2015, 07:43:06 PM: Here's a couple of pics of the trim tabs and the boat. Thanks again!