Sun Tracker Party Barge 22 in Norway

stigwh

Recruit
Joined
Jul 8, 2009
Messages
3
Hi all,
thank you for all the information provided through this forum. I've been reading lots and lots of threads, and gained (hopefully) sufficent information in the pontoon-area to make the most out of our "new" 2006 PB w Merc 50 4-stroke bigfoot engine.
As you may be aware of, the pontooning-enviroment in Europe and especially in the north of Europe is very limited. I guess you could say that in the whole of Norway there are a maximum of 20ish boats around... We normally will go for more sheltered deck-boats as the weather may vary from hour to hour and the distance to travel is not limited by lakes...

Our pontoon sits just near our house as we live by the sea, and this is a saltwater environment. I've read lots of therads on different forums regarding claening the pontoon immediately if ever been used in saltwater, but hopefully it will survive here... :rolleyes: Having towed the boat halfway through Norway to get home, (using a Volvo V70 Diesel for towing...), I did get a lot of attention on the road. In my rear mirrows it didn't look that big as I looked though the boat and hence was able to see the traffic behind me, but approaching other cars I honestly can say I saw a lot of big eyes...

Anyway, got home safe and sound, and we've been spending several hours on it during the past weeks.

And therefor some initail questions to you guys:
Propeller. I'm pretty sure the propeller is too small. It is a 14 x 9, and I suppose it should be 14 x 11 or maybe 14 x 13. The WOT speed is GPS just above 17 mph, but the rpm is close to 6200 (which I know is too high). Furthermore, as the merc 50 EFI is identical to the 60 horsepower EFI it is possible to reprogramme the ECU and make my engine put out another 10 hp (which is never wrong!)
This job will set me back about 500 USD, and before you argue that the price is high, I'll put down a few word about cost for boats/engines over here...
A new PB22 with 60 hp Merc cost close to 60.000 USD. A 32 Party Cruiser with 90 HP will take out 75000 USD from your pocket... But then again the prices will not drop significantly when you sell - expect approximate 10% a year the first two, and then stabilize. On the positive side, our sale of goods-act gives you a full 2 years warranty and furthermore you can raise a claim against the dealer for malfunction in a 5 years period from the first salesdate. So, back to the 500 USD for an additional increase in hp - its fairly cheap in this respect!

After my summerholiday I will check the new WOT rpm with now an engine putting out 60 hp, and decide which prop I should buy. Unfortunately, we can not try the prop first - I'll have to buy it and if it is incorrect - buy anotherone...

We travel most of the time with 3-5 people, mixture between adults and kids, so the load is not really that heavy. As of today, I still get above 6000 rpm at WOT with 12 people aboard.

One ting I've noticed is that the engine almost get flooded with waterspray at high speed. I know it has to be mounted fairly low to get the full grip, but is it normal to "plough" so much water?

I'd be delighted if enyone with a similar set-up as mine (with a 60 hp) can give some recommandation of propeller size and expected speed and also some information of the waterspray.

If anyone is interested, I may publish in some photos of the boat and its surroundings (if I can figure out how to)

Regards

Stig
 

Silvertip

Supreme Mariner
Joined
Sep 22, 2003
Messages
28,771
Re: Sun Tracker Party Barge 22 in Norway

Let's address the power issue first. You are correct in that the 50 and 60 HP engines are physically the same except for the electronics and fuel mapping. The extra 10 HP would very likely not produce a very significant increase in performance except possibly when heavily loaded. The net result is that wide open throttle rpm will not change much so speed will be the same at the same RPM as before. My personal feedling is that this is not money well spent.

As for the prop, Mercury makes a pontoon specific four blade prop and for your application it would typically be 14x11P. This prop is of the "elephant ear" design (big roundish blade shape) which is specifically designed for pontoon use. It provides more efficient forward thrust as well as more reverse thrust for docking maneuvers. A conventional three or four blade cannot provide this reverse thrust performance.
 

stigwh

Recruit
Joined
Jul 8, 2009
Messages
3
Re: Sun Tracker Party Barge 22 in Norway

Hi guys,
just a quick update.
I've remapped the engine from 50 to 60, at least for the extra torque with heavy load. Furthermore, took a chance on a 14x13 Merc propeller, but only hit around 4200 WOT. Top speed, however, still 17 mph. Then I put back the original prop 14x9, and the engined revved to 6200 immidiately, with top speed of just over 17 mph.
The next step would definately to get a 14x11 Prop, and I got one (I thought) from ebay at a reasonable price. It turned out to be 13X13 when it arrived so I didn't expect much when I fitted it.
But it did make some differnce. Top speed is now just above 20 (I'll see 21 occasionally) at 5300 WOT. The cruising speed is now easy 15-16 MPH at 4600 rpm, which is far better than the previous setup both in terms of noise and fuel cost.
Lokking at the logs, I notice they are not very clean anymore, so I will take her out of the water as soon as I can to clean.

So what do you guys think - stay with this 13x13 or get a 14x11(P)? I don't expect much in terms of more top end speed, but would like to see a few houndred more rpms to be in the recommended 5500 - 6000 - range.

Thanks,
Stig
 

Silvertip

Supreme Mariner
Joined
Sep 22, 2003
Messages
28,771
Re: Sun Tracker Party Barge 22 in Norway

The 14 x 11P pontoon prop I mentioned is a four blade design and since props from different manufacturers (even though they have the same diameter and pitch) may be very different in rake, blade shape, amount of cupping, etc) so direct comparisons of performance is difficult to predict. However, all other things being equal, a one inch change in diameter would mean RPM would drop -- not increase which is what you are attempting to achieve. My feeling is that the Mercury four blade 14x11P is what you need.
 

SunTrackerPB21

Seaman Apprentice
Joined
Aug 15, 2008
Messages
41
Re: Sun Tracker Party Barge 22 in Norway

Hi guys,

The next step would definately to get a 14x11 Prop, and I got one (I thought) from ebay at a reasonable price. It turned out to be 13X13 when it arrived so I didn't expect much when I fitted it.
But it did make some differnce. Top speed is now just above 20 (I'll see 21 occasionally) at 5300 WOT. The cruising speed is now easy 15-16 MPH at 4600 rpm, which is far better than the previous setup both in terms of noise and fuel cost.
So what do you guys think - stay with this 13x13 or get a 14x11(P)? I don't expect much in terms of more top end speed, but would like to see a few houndred more rpms to be in the recommended 5500 - 6000 - range.

I have a 2005 ST PB21 Signature w/ 60 HP Merc/Tracker 2 stroke Bigfoot.
The WOT rpm is listed at 5500. I'm running the stock Merc BlackMax 14 X 13 prop and get 4950 with only two aboard (running 19-20 MPH on GPS), 4800 with 4, 4500 (15mph)with 6-8. Its working fine now but if I ever gave to replace the prop, I'll probably go "2 down" in size to get near 5500 WOT. They say you'll get 200+ rpm out of each step.

Alan
 
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