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Author Topic:   RE: TURBOLIFT
CHRISWEIGHT posted 10-21-2003 07:09 PM ET (US)   Profile for CHRISWEIGHT   Send Email to CHRISWEIGHT  
Please someone give me the URL for grand island marine. I have searched the web and ended up under a deluge of trekkies !!!

many thanks

$29 if it doesn't stop the porpoising little lost

prm1177 posted 10-21-2003 07:57 PM ET (US)     Profile for prm1177  Send Email to prm1177     
They don't have a web site. Old fashioned phonage is required: 321-452-8126 is the last number I have for them. Area code may have changed.
jimh posted 10-21-2003 09:04 PM ET (US)     Profile for jimh  Send Email to jimh     
Check in MARKETPLACE--maybe you can find a used one that was only run a few times.
nevada posted 10-22-2003 12:24 AM ET (US)     Profile for nevada  Send Email to nevada     
Is thiS what you are after?

Rick Dewees posted 10-22-2003 03:46 PM ET (US)     Profile for Rick Dewees  Send Email to Rick Dewees     
This was in a previous post:


4whaler posted 10-22-2003 05:22 PM ET (US)     Profile for 4whaler  Send Email to 4whaler     
Rick has nailed it
jimh posted 10-22-2003 11:15 PM ET (US)     Profile for jimh  Send Email to jimh     
I like the part about how it "stores energy" and has "energy chambers."

NASA ought to look into this thing.

kingfish posted 10-23-2003 10:42 AM ET (US)     Profile for kingfish  Send Email to kingfish     
Caught that, too - must be kind of like flubber?
Moe posted 10-23-2003 11:15 AM ET (US)     Profile for Moe  Send Email to Moe     
I still think you oughta replace the bow-lifting prop to address the porpoising issue before using a fin. If motor is mounted high so the fin is out of the water at higher speed and not producing drag, how is it going to hold the bow down, particularly trimmed out?

Here's what Merc has to say about your Laser II prop:


If you like to run fast and light, the Laser II is your propeller. A three-blade stainless steel design providing amazing bow lift for high horsepower light weight outboard powered 15' - 18' and sterndrives up to 22'.

For outboards 75 hp and up and Alpha Sterndrives 3.0L - 5.7L
High-rake design for greater bow lift
R/H and L/H rotation (19" - 26" pitch)
Equipped with Flo-Torq II hub system

"Amazing bow lift" is the last thing I'd want on a porpoising boat.


CHRISWEIGHT posted 10-23-2003 01:00 PM ET (US)     Profile for CHRISWEIGHT  Send Email to CHRISWEIGHT     
hi Moe,

yeah i follow, but the boat is fine at high speed say 30mph up, its at lower speeds 25 ish that she will tend to sit lower down at the stern and porpoise.

To be perfectly honest a new ss prop at the moment here in the uk will cost around $600 and having run the idea of trying a few past local dealers, I did not get a warm reception. Which will mean I'll have to buy before I can really tell if its improved the problem.

Am I unrealistic to expect the boat never to porpoise, or is It possible that I need to control the trim better, trimming in will stop the problem but the engine note changes and the feeling is that the boat is not running in the sweet spot so to speak.

I have read much discussion on the site and many posts seem to imply that the turbo-lift or Doel fin are the answer?

as you can probably tell I am now going round in circles with more questions than answers.

thank you all for your input.


4whaler posted 10-23-2003 02:10 PM ET (US)     Profile for 4whaler  Send Email to 4whaler     
I went thru the same drill with the prop change out and while it helped a little especially with the bow lift out of the hole the porposing was still there until I down trimed all the way to the stop. The addition of the Turbo Lift gave me back trim to the mid rage of my digital display with out noticable loss of speed. I now trim up once on plane from a digital # two positon start out of the hole until the porposinging starts and then back off to down trim a bar or two (4 per # notch) with 5 notches on display. 5 being the up trim top end. It seems to like it between # 2 and #3 depending on weight and location of passengers/gear.

Moe posted 10-23-2003 02:25 PM ET (US)     Profile for Moe  Send Email to Moe     
I understand your perspective, Chris. While I'm generally not in favor of fins on a properly designed and loaded hull, I'll just wish for you that the turbo lift solves the problem. Sounds like it's happening as the boat wants to fall off plane, and the fin may do the job in that case.


CHRISWEIGHT posted 10-23-2003 02:35 PM ET (US)     Profile for CHRISWEIGHT  Send Email to CHRISWEIGHT     
Ill probably give the Doel fin a go, as it is easy to buy in the UK and just see where we get too. if it doesn't work I have to start looking at props.


CHRISWEIGHT posted 10-23-2003 03:48 PM ET (US)     Profile for CHRISWEIGHT  Send Email to CHRISWEIGHT     
thanks for the post sounds good I will try the fin first as like yous the boat doesn't really want to respond to trim at least as much as I expect it to.

my only other experience with PTT is on a larson 18sei and she was much more effected by trim position.


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