1981 Aquasport 170 rebuild in Sweden

[larsli68]

Hello guys,

Input welcome. I have a 13x19 Mercury prop on my 115 Optimax. 5100 rpm max and 35 knots.

The Mercury prop selector says go to a 13x17. Do you guys agree?

Thanks in advance,

Lars

[Capt. Bob]

Well that should get you  much closer to your rated WOT of 5700 (around 5500) so it will help.

Trim adjustment underway should get you real close.

Good luck.

[fitz73222]

Lars,
The normal calculation is 200 rpm per inch of pitch change, so you should be fine with a 17 pitch and faster.

[larsli68]

Thanks guys,
I will try a 13x17 prop next. I will post the results of course.

//Lars

[larsli68]

We had a beautiful day on the Baltic today. First we watched a swim run with more than 400 teams (2 people per team). I had two buddies competing.
Afterwards, we took the longest ride we have done so far to a light house up the coast. We had lunch and waited for my brother and his family, who where sailing back
from a classic yacht meet.
My face is red from all the sun, but it was a super nice last day of summer vacation.

[Capt. Bob]

Nice indeed but.....

Did you switch props?

[CLM65]

Beautiful pics!

[larsli68]

Thanks guys,

No, same prop still. I will call the guy tomorrow and see how we will do the "trade".

Beautiful day here today. I never wanted to go back to the mooring.

//Lars

[larsli68]

Since it is vacation times here in Sweden, and I have gotten no response from the company where I bought the Merc, I ordered a 13.25x 17 prop today.
I will get it on Friday. No prop shops here where I live... I went to the marina who sells Mercury and asked if they had props in stock...
The answer was no... I couldn't believe it...
Posting a couple of pictures from tonight. Washed the boat and took it for a spin with my nephew, Gustav, the captain.

[RickK]

Is there a local sailboat shop?  I would bet there is.

[larsli68]

Yes Rick, you are right. I also live in a small town, if I go to Stockholm, I can find more stuff.
We are going out again tonight. Fishing!
If we catch anything, I will post pictures.
//Lars

[larsli68]

I finally got my new prop today! 13 1/4" x 17" instead of the 19".
Boat accelerates a lot better out of the hole, and top speed remains at 35 knots.
Top rev about 5800 rpm's.
I might try a 18" steel prop next season.
The boat works and feels so much better now. Posting a picture from tonight.

[larsli68]

Acted tug boat last night. My brother sailed his 6mR into town, and the wind died down. Went out and picked him up.

[larsli68]

I ordered a 13x18" Vengeance prop today!
I will also raise the motor two holes for next season. I had the motor serviced on Thursday. The guy is the best one with Mercs around here.
He told me 24 hours and everything looked fine in the computer. It feels good to also have the warranty extended to 5 years.
I can't wait to see how the boat will do with raised motor and steel prop! 

The boat is now in winter storage. I could keep it in the water another month, but with my new job and loads of travelling, it feels good to get this done.
//Lars

[RickK]

Man I know it's killing you to have to put her in storage and end the boating season already 

Boat looks good after sitting on a mooring all summer.