Notices
The Boating Forum

Underpowered boats

Old 10-25-2020, 07:48 PM
  #1  
Junior Member
Thread Starter
 
Join Date: May 2020
Posts: 17
Received 0 Likes on 0 Posts
Default Underpowered boats

Hey just curious any other ways to get a few more mph out of your boat when it’s under powered I got a 120 on a 20ft stratos changed props from 5blade to 3 blade and it just out of hole so much faster 3-4 seconds in plained out but at wot trimming it as much as I can I am still in the water a lot I understand because I am underpowered is there anything I can do to maybe squeeZe a little more speed or just get it out of the water some more I have a jack plate as well and it’s as high as I can go?!?? Thanks in advance
Old 10-25-2020, 07:52 PM
  #2  
Senior Member
 
Join Date: Apr 2016
Location: Pompano Beach, Florida
Posts: 329
Received 318 Likes on 112 Posts
Default

Wax the bottom....
Old 10-25-2020, 08:25 PM
  #3  
Senior Member
 
Join Date: Sep 2015
Posts: 116
Received 10 Likes on 3 Posts
Default

Originally Posted by Barrington View Post
Wax the bottom....
I thought waxing the bottom made them stickier in the water.
Old 10-25-2020, 09:09 PM
  #4  
Senior MemberCaptains Club Member
 
Join Date: Jun 2005
Location: Miami, Fl.
Posts: 3,522
Received 2,005 Likes on 936 Posts
Default

Gut the boat of excess weight.
Install trim tabs.
Nitrous shot.
Old 10-25-2020, 09:15 PM
  #5  
Senior Member
 
Join Date: Oct 2015
Posts: 891
Received 272 Likes on 163 Posts
Default

Install a SE-Sport hydrofoil?
Old 10-25-2020, 10:20 PM
  #6  
Senior Member
 
Join Date: Apr 2016
Location: Pompano Beach, Florida
Posts: 329
Received 318 Likes on 112 Posts
Default

Originally Posted by Dave RR View Post
I thought waxing the bottom made them stickier in the water.
I was being funny.....

I have no idea if it makes it stickier, but the boat race crowd puts some kind of coating on the bottom, I just assumed it was wax.

However, in reality, with only 120hp, there are only so many things you can do. Weight, tabs, fin, prop,? There’s nothing else I can think of.
Old 10-25-2020, 10:47 PM
  #7  
Senior Member
 
Join Date: Jan 2007
Location: NSW Australia
Posts: 6,933
Received 2,035 Likes on 1,129 Posts
Default

Most important of all engine height, then max RPM, optimum prop model, trim weight out of boat, distribute weight.
Likes:
Old 10-26-2020, 06:00 AM
  #8  
Senior Member
 
Join Date: Nov 2014
Posts: 5,121
Received 1,007 Likes on 517 Posts
Default

Originally Posted by Capuria91 View Post
Hey just curious any other ways to get a few more mph out of your boat when it’s under powered I got a 120 on a 20ft stratos changed props from 5blade to 3 blade and it just out of hole so much faster 3-4 seconds in plained out but at wot trimming it as much as I can I am still in the water a lot I understand because I am underpowered is there anything I can do to maybe squeeZe a little more speed or just get it out of the water some more I have a jack plate as well and it’s as high as I can go?!?? Thanks in advance
The boat needs more HP, and the post needs more punctuation.
Likes:
69Mach390, 706jim, 71Outrage, dave3fl, Poorbastard, YeOldeStonecat and 1 others liked this post. (Show less...)
Old 10-26-2020, 06:37 AM
  #9  
Senior MemberCaptains Club MemberPLEDGER
 
Join Date: Nov 2002
Location: Toms River NJ
Posts: 2,132
Received 95 Likes on 60 Posts
Default

Originally Posted by 6104696 View Post
the boat needs more hp, and the post needs more punctuation.
lol......................
Old 10-26-2020, 08:05 AM
  #10  
Junior Member
Thread Starter
 
Join Date: May 2020
Posts: 17
Received 0 Likes on 0 Posts
Default

Originally Posted by noelm View Post
Most important of all engine height, then max RPM, optimum prop model, trim weight out of boat, distribute weight.
is it possible my motor is too high?
Old 10-26-2020, 08:09 AM
  #11  
Senior Member
 
Join Date: Jun 2014
Location: Middle Sound, NC
Posts: 8,905
Received 1,707 Likes on 1,093 Posts
Default

How fast does it go with the 120?
Old 10-26-2020, 08:10 AM
  #12  
Junior Member
Thread Starter
 
Join Date: May 2020
Posts: 17
Received 0 Likes on 0 Posts
Default

Originally Posted by Corndog38 View Post
How fast does it go with the 120?
on a calm day just me I can get 36-37 out of it but I am still in the water in front of me no behind me.
Old 10-26-2020, 08:29 AM
  #13  
Senior Member
 
Join Date: Apr 2009
Location: CT
Posts: 304
Received 556 Likes on 241 Posts
Default

Originally Posted by Capuria91 View Post
on a calm day just me I can get 36-37 out of it but I am still in the water in front of me no behind me.
Say What???

Old 10-26-2020, 08:34 AM
  #14  
Senior Member
 
Join Date: Apr 2014
Location: Lake Hopatcong NJ
Posts: 977
Received 107 Likes on 78 Posts
Default

Originally Posted by Capuria91 View Post
on a calm day just me I can get 36-37 out of it but I am still in the water in front of me no behind me.
Sounds about right to me.
I'd have thought you would have had better performance with the 5 blade prop.

I had a 4Cylinder Mercruiser and it did much better with a 4 blade prop vs a standard prop.
Old 10-26-2020, 09:49 AM
  #15  
Senior Member
 
Join Date: Jun 2014
Location: Middle Sound, NC
Posts: 8,905
Received 1,707 Likes on 1,093 Posts
Default

Originally Posted by Capuria91 View Post
on a calm day just me I can get 36-37 out of it but I am still in the water in front of me no behind me.
Speed seems about what I would expect on a 20' with 120hp. I don't understand what the second part of your post means.
Old 10-26-2020, 10:09 AM
  #16  
Senior Member
 
Join Date: Apr 2011
Location: Thunder Bay Canada
Posts: 636
Received 37 Likes on 28 Posts
Default

My old Starcraft Holiday would hit about 42 with its 140hp OMC Devil drive. It was only 18' long and 1650 lb probably a lot lighter than this 20' fiberglass hull. If you're getting 37mph with 120hp I think you're beating a dead horse if you think it's going to go any faster with another prop etc.
Old 10-26-2020, 10:11 AM
  #17  
Junior Member
Thread Starter
 
Join Date: May 2020
Posts: 17
Received 0 Likes on 0 Posts
Default

Originally Posted by Gtochris View Post
Sounds about right to me.
I'd have thought you would have had better performance with the 5 blade prop.

I had a 4Cylinder Mercruiser and it did much better with a 4 blade prop vs a standard prop.
actually top speed was better but it took 10 seconds to plain out and I wasn’t getting the rpms
Old 10-26-2020, 10:13 AM
  #18  
Junior Member
Thread Starter
 
Join Date: May 2020
Posts: 17
Received 0 Likes on 0 Posts
Default

Originally Posted by Corndog38 View Post
Speed seems about what I would expect on a 20' with 120hp. I don't understand what the second part of your post means.
when I am wide open and trimmed as high as I can go the boat is still in the water in front of me like the nose is still down a lot when I see other boats the last couple feet are in the water the rest of the boat is out. Now I understand it’s mostly because of Power but what about jack plate height?
Old 10-26-2020, 10:30 AM
  #19  
Senior Member
 
Join Date: Aug 2005
Location:
Posts: 972
Likes: 0
Received 278 Likes on 128 Posts
Default

Your boat should be “in the water” as you say. It’s not a high speed bass boat. 36-37 is about right for a 120 on that boat. Enjoy it and stop thinking weird thoughts that your boat should magically be “out of the water” except the last few feet.
Old 10-26-2020, 10:36 AM
  #20  
Senior MemberCaptains Club Member
 
Join Date: May 2005
Location: Seattle, WA
Posts: 10,510
Received 1,396 Likes on 864 Posts
Default

A good bow lifting prop certainly will raise the hull out of the water more, reducing wetted surface and drag, and allowing more boat speed.

Choosing the right prop must be fine hand in hand with motor mounting height, and you don’t need a jack plate to do that.

Weight reduction, as well as balance will affect a boat’s performance significantly too, as well the fairness of the bull’s bottom.

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.