1981 Aquasport 170 rebuild in Sweden

[larsli68]

Thanks for the input!
It feels good that it's not the prop that is the problem. I will try the stainless steel prop again tonight. I will make sure I torque the nut properly and test it again.

Thanks for your support! 

//Lars

[larsli68]

Thanks everyone that have given me input to how to solve this problem!

I did some work tonight. I have two Flow Torq II hubs. I used the other one on the stainless steel prop, and used a higher torque than I had previously done.
Tested the boat tonight and it ran perfect! I'm super happy with it. I can maybe hear a little rattle on idle, but it is hardly noticeable. I'm super happy with how the boat felt, accelerated and performed tonight. We did a short test run, it was very windy tonight.

Thanks guys! 

//Lars

[fitz73222]

Good to hear Lars, glad we could help.

[larsli68]

I'm still smiling ear to ear over how the boat felt with the new prop!

//Lars

[larsli68]

Waiting for better weather...
Great weather all week when you are at work... come Saturday, we have had rain pretty much all day today...
It's supposed to be better tomorrow. I'm hoping to take the boat out tomorrow. My boat, now with a stainless steel prop at our marina.

[larsli68]

Long weekend coming up!
I can't wait to have 4 days off. Swedish midsummer this Friday!

[larsli68]

Finally on the water! I took off an hour early from work today. Took the boat out in the archipelago.

[fitz73222]

Hi Lars,
What are your new numbers with this propeller? Inquiring minds want to know!

[larsli68]

It was very windy and quite a lot of waves yesterday (again). I will test this weekend and post numbers.

[larsli68]

We did 36.5 knots today with 5800 rpm on the OptiMax Merc.
A bit disappointing. I have the bottom of my boat painted.

I had been hoping for 38 knots. I almost feel that the motor is two high. I moved it up two holes this year. I might take it back down one hole and try again.
I can't push the bow up without loosing grip of the prop.

What do you guys think?

[fitz73222]

Hi Lars,
Where is the anti ventilation plate relative to the bottom? My experience with vengeance propellers is they can take a little bit of trim but don't give a high degree of bow lift before slipping but that totally depends on the boat design. Our boats are not speed demons. The design has no lift strakes except for the bow entry. So we're basically just running straight V bottoms with nothing to really break up the adhesion of the water unless you're running in a chop. You may be loosing a little speed because of the bottom paint but it's the trade off to be able to keep the boat in the water. 42 statute miles per hour is a respectable speed and honestly does it really matter? It's funny about our boats, whether it's a 17 or a 22-2 we all seem to cruise at 25-28 mph. You put a lot of hard work into that boat, put a brand new engine on it, it runs great, sit back, relax and enjoy the fruits of your labor!

[RickK]

Lars I understand your frustration for speed but I agree with Farley about the design of the last 2/3 of our boat (reluctantly since I have the same frustration about breaking the 40 mph barrier). I have done a lot of change to my rebuild to get back to non-bottom paint, maybe in the quest for speed (of course). He is right about the cruise speed being 28ish. I always planned on 5-6 gals/hr burn at 30 mph. If I do better on the rebuild I' m happy.

[larsli68]

Thanks guys!

I'm very happy with how the boat feels at cruising speed. It accelerates a lot better with the stainless steel prop. I wish we had a real prop shop here, where I could try different set ups, but
my town is too small for that. I'm still a little bit faster than my brother in his Boston whaler Montauk 17... 
I will settle and be happy. It would be interesting to see what a wet sanded bottom would do to the top speed...
But my boat sits in the water 3-4 months out of the year.

Thanks for your input and support! I am very happy with the boat/performance

//Lars

[larsli68]

My boat at the mooring. My brother's Whaler in the back.

[RickK]

How far is the mooring from your home?  I don't see any registration numbers on your boat - is it required in Sweden?