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Author Topic:   Turbo-Lift Results
kbshoaps posted 05-16-2004 12:31 PM ET (US)   Profile for kbshoaps   Send Email to kbshoaps  
Finally got into the water up here in Northern Maine!

I have a 150 Sport with 60 4 stroke Bigfoot and furnished aluminum prop 13 3/4 X 14. (By the way, is anyone interested that BW now supplies a SS prop with this combination?)

The boat behaved well before the Turbo-Lift with the motor 3/4 inch above the keel (one hole up from the way it was delivered in 2003). It could not be made to porpoise, top speed 36.5@ 5800 rpm on WAAS enabled GPS, and planed in about 4 seconds (despite what the BW performance specs say). My only complaint was that it planed at 16-17 mph and I wanted it to plane at a slower speed (my old Crestliner planed at 11-12 mph). I also noticed that the prop would wildly ventilate on very sharp left hand turns at any speed over 20 mph.

With the Turbo-Lift the boat is even better! It still won't porpoise, top speed STILL 36.5 mph @5800 rpm, now planes in 2-3 seconds(WOW)and very little ventilation (whereas before the Turbo-Lift the motor would go from ~3800 to redline at 20 mph, it now goes from 4000 to 4500 at 25 mph. Seems to be quite a bit quieter also.

Unfortunately, the planing speed only dropped to 15-16 mph but I guess you can't have everything.

I was worried that the extra 10-12 pounds mounted so far back from the transom would cover the drainage port which was right at the waterline but that isn't a problem--the transom sits about 1/2" lower and the boat is still self draining.

The Turbo-Lift instructions say to raise the engine as far as possible but I'm afraid the cooling water intake might be too high. I did get a 1.5 mph increase when I raised the motor one hole or 3/4" last year. I might try another hole later (or talk the wife into a 90 hp).

I'm interested in comments about the prop change. I was at the boat show in April and found a 150 equipped with a vengeance 14 p. Was told by a salesman that there had been a recall (hard or noisy shifting complaint)and upgrade to SS--did anyone else hear of a recall?

Keith

Moe posted 05-16-2004 01:54 PM ET (US)     Profile for Moe  Send Email to Moe     
Keith, just for the record, our aluminum Black Max Prop isn't 14" pitch, it is 13-3/4" X 15" pitch, PN 48-77342A33, "Used only with 40-50-60 HP BigFoot FourStroke, equipped with soft rubber hub for low horsepower, painted silver."

The next size down is 14" X 13" pitch, PN 48-77340A33, also "Used only with 40-50-60 HP BigFoot FourStroke, equipped with soft rubber hub for low horsepower, painted silver." Since we're wanting to start carrying a spare prop, I am considering buying one of these since we've now got the boat so well equipped :) with gear and may drop out of the 5500-6000 rpm range with the 15". I also want to have the torque to power the heavier loaded boat over the occasional 5-6' wave. But with you being at 5800 now, the 13" Black Max would probably be underpropped for you.

The 13-3/8" X 14" pitch Vengeance is PN 48-17314A46. From what I can gather, to use it on a 60HP BigFoot, may require a Flo-Torq III Hub Kit, PN 835257K 9 about which Mercury says, "Flo-Torq III 40-60 HP FourStroke Bigfoot 90-115 HP FourStroke (Aluminum or Stainless steel props, reduces prop rattle)."

If you want a real-world comparison of our 15" Black Max prop and the 14" Vengeance, there's an article about the 190 Nantucket with various motors and props in the CW Reference section. They used both these props on the 115 HP four-stroke, which has 2.07:1 gearing compared to our 2.33:1. I put this data in a spreadsheet and added columns for Calculated Speed (theoretical) and Prop Slip. It's available at:

http://www.engr.udayton.edu/staff/lriggins/Whaler/Props/190NTperfdatawithslip.xls

From what I see, the major difference is that at the same 19 mph cruise speed just above planing speed (which doesn't appear to change), the Vengeance runs the motor about 500 rpm higher. And there's more slip with the Vengeance in the 4,000-5,000 rpm range. The top speeds are the same.

I have not heard any rumor about a recall, nor have I had any shifting noise. In fact, a stainless is much more likely to have a problem with that. In the end, perhaps the Vengeance with a special hub made to address prop rattle (the Flo-Torq III) solved a problem some (but not me) were having with shifting noise.

From yours and my observations, it appears Whaler selected a pretty good prop for the 150 Sport with the 15" Black Max, and correctly mounted the motor in the middle hole, with the AV plate about at the bottom of the transom. I've not been able to make the boat porpoise, even loaded stern-heavy, and have to be trimmed WAY out in pretty high chop to get any ventilation. Nevertheless, it is interesting to hear your results of fine-tuning the 150 Sport.

--
Moe

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