Guests - If You want access to member only forums on FM. You will gain access only when you Sign-in or Sign-Up on Fishing Minnesota.

It's easy - LOOK UPPER right menu.

Sign in to follow this  
Followers 0
eyepatrol

Propeller advice

5 posts in this topic

I've got an 18 foot fiberglass boat with a 150 optimax on it. I've got 2 props. One is aluminum 3-blade and the other is stainless steel hi-five prop.

Question....why is it I can do about 56mph with the 3-blade aliminum prop and only 48mph with the hi-five ss prop? I was told the ss prop would get me more speed.

And, along those lines, can anyone recommend a ss prop that could get me a little more speed, yet not be too hard on the motor?

Thanks.

Share this post


Link to post
Share on other sites

The high=five is not a speed prop, it more suited for water sports or keeping hooked up in rough conditions. If you are looking for speed I would try a Mercury Rev4 or Tempest for speed. Mercury also makes a 4 blade aluminum that works great on heavier hulls.

Share this post


Link to post
Share on other sites

Before anyone can make an educated suggestion on a new prop it would be helpfull if you can provide your wide open throttle rpm... for both props.

Once you provide that one can make a more educated suggestion...

marine_man

Share this post


Link to post
Share on other sites

marine man

I guess I've never compared the rpm's between the aluminum and stainless steel props, but I have seen the rpm's at about 5250 with the aluminum.

If I'm not mistaken, the dealer I bought the boat from said the 150 Optimax (which is what I have) has an rpm regulator on it...that it won't let the rpm's exceed 5500. But, the best I can answer your question is to say with the aluminum prop the motor runs at about 5250rpms.

Share this post


Link to post
Share on other sites

I would take a look at the recommended RPM range for your outboard, which should be on a sticker on your motor (either on the powerhead, or on the tilt bracket).

Merc's website shows the recommended RPM range to be 5250 - 5750, but this could be different than your recommended range depending on what year your motor is... again, check the sticker to be sure.

If the recommended range is as I've listed it above the rpm limiter is beyond 5750... it's probably closer to 6,000... HOWEVER, you do NOT want to run the motor beyond the recommended range.. the rev limiters there to prevent any damage from happening, not as an upper limit.

Anyway, I'd try and find a prop that gets you closest to the upper range of the suggested range... you'll want to do that when you have your lightest normally run load on your boat (if you do a lot of fishing by yourself that'll mean you, 1/2 tank or so of fuel and some gear).

If the upper limit is 5750 and you're currently turning 5250 you could probably drop pitch by 2 for sure, maybe 4 depending on what pitch prop you're running right now...

Find out two things: 1) What the RPM range is for your motor) 2) What pitch prop you're running right now. On most mercury propellers (the aluminum ones anyway) you'll find it stamped on the outside hub of the prop (running parallel with the hub.) The two numbers you'll be interested in are the last two, which'll probably say something like 21P.

I'm not real sure where the pitch is on your stainless prop.. it's either in the same spot as the aluminum, or, if you take off the prop on the face of the prop that mates to the thrust washer on the propshaft.

Good Luck!

marine_man

Share this post


Link to post
Share on other sites
Guest
This topic is now closed to further replies.
Sign in to follow this  
Followers 0



  • Posts

    • jkrash
      I heard Casey retired and sold his boat.
    • Rick G
      Gills should be on or real close to beds. Crappies are on beds on some lakes, done spawning on others. Btw, welcome to Fishing Minnesota!
    • bowhuntingboy1
      It was on the opener last year.
    • Cliff Wagenbach
      Frazer Bay is as far as I venture West but that bay can be very good at times. I prefer Lindy Rigs with a 5' leader,#2 or a #4 hook, red or green bead by the hook, and a 3/4 oz. sinker. That time of the summer minnows and leeches work best but do not be afraid to try 1/2 crawler on this rig! Like PSU said, look with your electronics for the fish, then fish for them! 12" to 32" depths. Cliff
    • LoonASea
      Fished the big lake this morning ,,, Weather didnt start out nice but the fishing more then made up for it ,,, Got my first double and triple in the new rig today ,,, There is a lot of mud covering this side of the lake but finding clear to tea colored water paid off ,,,Natural colored sticks took a majority of hit today and the cohos have grown 5 inches in the last month ,,, I had one 23 inches today 
    • Fish Head
      Welcome to our Forum Muzzy!  You may want to consider hiring a guide for a day or even 1/2 day to start your trip.  They can give you a lot of good information that will help you put fish in the boat for the rest of your trip. Cliff & Casey are regular contributors here and members of the Lake Vermilion Guides League.  https://lakevermilionguidesleague.com/.    Good Luck!
    • PSU
      Hello Muzzy,   Lots of good spots close to Oak Narrows. I will let the experts pipe in, but I've been doing well in 20-30 feet of water in the Frazer / Smarts Bay area. I would trust your sonar and find spots off reefs and follow down to 20-30 feet. Either jig or Lindy has been working for me with a Rainbow minnow 
    • Mike89
      2nd Lucas thoughts
    • BulldogInTC
      Finally making it up this weekend to the cabin since January.  Looks like hit and miss weather conditions over the weekend, but I'm hoping to get some decent time in the boat...as long as the father-in-law isn't cracking the whip too hard  . That's good to hear about the success in Frazier, Matt.  Always seems like we are fighting for walleyes, but I'm hoping to change that and try a few new spots this weekend.  Hope everyone has a safe and good fishing holiday weekend.
    • Muzzy33
      We are from Indiana (land of terrible eye fishing). Staying in a cabin in the oak narrows June 3-10.  This is our fourth year fishing the big V, but have always fished the westside.  Never had great walleye fishing yet.  We normally stay father on the westside like around wolf Bay or Norwegian, so we wanted to find a cabin closer to the Eastside.  Figured the narrows would be closer so we can fish spots on the west side that we've already learned and also venture to the east where I've heard the walleye fishing is better for keeper walleyes.  I'm looking for any tips or locations to try.  Maybe someone could help us out.  It would be much appreciated.  Thank you