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 Whiskerkitty.com Forum Index » CATFISH BOAT TALK » Amount of Prop below boat
  The time now is Fri Apr 18, 2014 12:22 am 

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Post Posted: Thu Mar 24, 2005 8:17 pm    Post subject: Amount of Prop below boat Reply with quote

Lawki



Joined: 01 Mar 2003
Posts: 482

I would like to know how far below the bottom of the boat the prop should be sitting. How much of the lower unit should be exposed under the boat?

Hopefully this pict will help:
[img]http://groups.msn.com/_Secure/0RgAIAykVPu6kXxVXivpr6EM2VlEg9RBl2qAPFVyXmIT5MEpWKUjmemVv63lrTCQBJtxkGRazOob7399AHnSs!1WMfdY662VFsdqUu8wbvPo/prop0.JPG?dc=4675515361881250193[/img]

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Post Posted: Thu Mar 24, 2005 10:31 pm    Post subject: Amount of Prop below boat Reply with quote

jackieblue
Catman


Joined: 03 Mar 2003
Posts: 4138
Location: Silver,City Gun Barrel,Teague BR549

The cavitation plate/anticavitation plate, just above the prop should be even with the bottom of the boat. At lest thats what I have always been told, my current Yamaha 40 on a 17' modified vee is set up like that. Therefore all the prop is below the bottom of the boat.

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Post Posted: Thu Mar 24, 2005 10:47 pm    Post subject: Amount of Prop below boat Reply with quote

RG



Joined: 09 Sep 2002
Posts: 717

You'll know pretty quick if it's too shallow. On a plain bottom ole hull, follow Jackie's advice. I tried to set mine too high and found it ran really good at low speed but soon as water started flowing fast, cavitation took over and, well it's pretty imbarrasing to tell you the truth. :rolleyes:

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Post Posted: Thu Mar 24, 2005 11:17 pm    Post subject: Amount of Prop below boat Reply with quote

etex johney



Joined: 30 Jul 2002
Posts: 1067
Location: Henderson, Texas

RG and Jackie is right. Like RG says, you'll know if it's too high. The motor will scream with high rpm's if it's too high. Even with the bottom or just below is a good place to start. I'm talking about the first flat plate, just above the prop.

ETex Cool

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Post Posted: Fri Mar 25, 2005 9:45 am    Post subject: Amount of Prop below boat Reply with quote

Lawki



Joined: 01 Mar 2003
Posts: 482

Thank you guys for the advise and help. I will have to check and see if the motor sits like it is supposed to and see if it is sitting to low. Thanks!

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Post Posted: Mon Mar 28, 2005 1:33 pm    Post subject: Amount of Prop below boat Reply with quote

jackieblue
Catman


Joined: 03 Mar 2003
Posts: 4138
Location: Silver,City Gun Barrel,Teague BR549

My new boat will have zero amount of prop below the boat.

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Post Posted: Mon Mar 28, 2005 5:22 pm    Post subject: Amount of Prop below boat Reply with quote

Lawki



Joined: 01 Mar 2003
Posts: 482

Sounds like we need to have a picture or two of this new high powered machine.

Congrats!

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Post Posted: Mon Mar 28, 2005 8:26 pm    Post subject: Amount of Prop below boat Reply with quote

jackieblue
Catman


Joined: 03 Mar 2003
Posts: 4138
Location: Silver,City Gun Barrel,Teague BR549

Its a tunnel hull, still getting wire cutters to sneak it out the back.

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Post Posted: Tue Mar 29, 2005 12:30 am    Post subject: Amount of Prop below boat Reply with quote

RG



Joined: 09 Sep 2002
Posts: 717

I was over in Gatesville here while back, just visiting...not a guest, and went by Deckboat to get some parts for an old model. The feller took me out to a warehouse where they had a prototype bay rig they was working on. Basically, it was just a deckboat with a tunnel hull. The bottom of the prop was pretty much even with the bottom of the boat. They claimed it would run in six inches of water. Knowing how wide and flat these things are, I don't doubt it would.

Jackie, let me know if you need someone to hold the flashlight while you work over that fence.

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Post Posted: Tue Mar 29, 2005 2:22 am    Post subject: Amount of Prop below boat Reply with quote

mfclark(mudcat)



Joined: 12 Feb 2004
Posts: 240

I had a 1998 23' center consoled Red Fin with a 115 Johnson mounted on a jack plate. This boat had a very deep tunnel under it. It would easily run in 6" of water. In deep, rough water it would beat you to death. The way I fish, I wouldn't own another tunnel hull on a bet. My present boat is a 19' Blue Wave V bottom. I run it in 2' of water all the time.

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