It is currently 16 Aug 2018, 09:33
Join the free forum or login with your account and the annoying banner goes away

FishonFabrications

All times are UTC - 5 hours [ DST ]




 Page 1 of 1 [ 4 posts ] 
Author Message
PostPosted: 23 Mar 2017, 14:33 
Donor
User avatar

Joined: 12 Dec 2014, 14:32
Posts: 1878
Location: New England
Here are a boat speed and prop slip calculator if anyone is interested:

Theoretical Hull Speed = ( Prop Pitch X RPM ) / ( LU Gear Ratio X Constant of 1056 )

Prop Slip = ( Theo. Speed - Actual Speed ) / ( Theo. Speed )

I have found the speed one pretty accurate with small open v-hull skiffs. But where a lot of your guys' boats have extensive flooring, decking, and compartments ... I'd expect lower actual speeds due to the actual weight carried. Also note a jon boat will have more wetted surface on the running hull and will be slower.



_________________
#1) 1st tin rebuild, 18' Lund viewtopic.php?f=21&t=36583
#2) 25' Parker refurb from EMPTY hull http://www.classicparker.com/phpBB3/vie ... p?f=15&t=6
#3) 16' V-tin rebuild viewtopic.php?f=21&t=36465
#4 Procraft SV14
#5) 16' Starcraft entirely NEW Transom Skins viewtopic.php?f=3&t=37548
Online
 Profile  
 
PostPosted: 23 Mar 2017, 14:38 
User avatar

Joined: 08 Feb 2017, 09:20
Posts: 59
Thanks man. I'll try and figure it out. Going to raise the motor up a bit and play with trim this weekend. I just figure I had a fiberglass glasstream bass boat years ago with a 70 that ran 42. This boat weighs half as much it should scoot! Hopefully I can get it dialed. I'll post up as I experiment. Hopefully put a tach on soon as well.

Sent from my HTC One M9 using Tapatalk


Offline
 Profile  
 
PostPosted: 23 Mar 2017, 16:14 

Joined: 17 Aug 2016, 20:52
Posts: 346
Location: NJ
Knowing ones LU gear ration is key to this.


Offline
 Profile  
 
PostPosted: 04 Jun 2017, 21:01 
User avatar

Joined: 02 Dec 2013, 21:05
Posts: 714
Good calculator here:

http://www.mercuryracing.com/prop-slip-calculator/



_________________
1991 18' Valco Bayrunner Evenrude 48 SPL

Arizona
Offline
 Profile  
 
Display posts from previous:  Sort by  
 Page 1 of 1 [ 4 posts ] 

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: donairplane, Google Adsense [Bot], nytebyte and 42 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
Join the free forum or login with your account and the annoying banner goes away

Xtremeboats