Back to PROPGODS.COM...

Welcome Guest Search | Active Topics | Members | Log In

Cape Horn 21 - F250 Prop help..... Options
Reel Irie
Posted: Monday, April 18, 2011 3:56:15 AM
Rank: Member
Groups: Member

Joined: 4/18/2011
Posts: 10
Points: 30
Location: Clearwater, FL
I have a new to me 2009 Cape Horn 21, with Yamaha F250, Lenco Trim Tabs, Mercury Mirage Plus 19p.

When I first got the boat and test ran it, I immediately thought it was not getting up on plane fast enough.  After a few more runs I seemed to be ok with the handling, but I was having to use a lot of trim tab down to run correctly.

WOT is at 5700 rpms, which is about 47mph.

My first real fishing trip, we headed 20 miles off shore in sloppy conditions.  I had to have tabs all the way down spinning about 4100 just to stay on plane and chug through the waves. This with 129 gallons and three guys loaded to fish....

I would like to be able to get on plane quicker, cruise at a slower more efficient speed, and be able to handle the offshore conditions better.  I am not looking to be a speed demon....

Any recommendations???


Ken2
Posted: Monday, April 18, 2011 8:40:03 AM
Rank: Administration
Groups: Administration

Joined: 2/27/2007
Posts: 5,689
Points: 16,719
Location: Sarasota
Strange that you need that much tab to keep it running well.

I'd go with a 17 pitch Revolution 4. You'll have significantly stronger acceleration. And you'll get some sternlift which should help with the bow high attitude.

You might give up a couple mph on top end though.

Also, you may end up raising the motor. Capehorns have the motors pretty low from the factory.
That will also help with the bow high attitude.
Reel Irie
Posted: Monday, April 18, 2011 9:13:02 AM
Rank: Member
Groups: Member

Joined: 4/18/2011
Posts: 10
Points: 30
Location: Clearwater, FL
yesterday I was out with Girlfriends Mom and had to run almost tab all the way down (maybe 2 bars from bottom on indicator) spinning 3800-4000 rpm to maintain on plane and riding good.  This was in the inter coastal with just light chop.  I think I was around 22-25mph.

The Engine is mounted on the hole closest to top of "bracket"

With the Rev 4 would I need a hub kit?

I think I am going to call Cape Horn and ask them what they recommend also.
Ken2
Posted: Monday, April 18, 2011 12:56:41 PM
Rank: Administration
Groups: Administration

Joined: 2/27/2007
Posts: 5,689
Points: 16,719
Location: Sarasota
Here is a good articule written on engine height. Lets you know what to look for.
http://www.veradoclub.com/smf/index.php?topic=137.0

The Rev 4 is a Mercury prop, you'd need a hub kit to make it fit a yamaha motor.

I'd be curious what Capehorn says. I seriously doubt they will recomend raising the motor, but maybe they have a different prop they run normally on that hull. who knows.

Reel Irie
Posted: Monday, April 18, 2011 1:23:57 PM
Rank: Member
Groups: Member

Joined: 4/18/2011
Posts: 10
Points: 30
Location: Clearwater, FL
thanks, I just went outside to look at the height and sitting on the trailer with the motor trimmed down it looks like my ventilation plate is just above (1/2"?) the bottom keel point of my boat. I have noticed a V of water splashing out from the sides of the engine when underway, I usually keep motor trimmed down because it feels like I need to. I will get back there and investigate where the cav plate is riding next time out .....
Ken2
Posted: Monday, April 18, 2011 1:45:01 PM
Rank: Administration
Groups: Administration

Joined: 2/27/2007
Posts: 5,689
Points: 16,719
Location: Sarasota
Yeah, see what it looks like when your running.

I think you'd like the feel of the Revolution 4, but raising the motor witht he Rev 4 will be the best case scenario for leveling out the ride and keeping that bow down.
Reel Irie
Posted: Wednesday, April 20, 2011 6:11:23 AM
Rank: Member
Groups: Member

Joined: 4/18/2011
Posts: 10
Points: 30
Location: Clearwater, FL
talked with Cape Horn said boat was set up like that from Factory -- the Mercury or Yamaha 19 is what they usually put, mounted on lowest setting

Ill check it out next time on water to see where cavitation plate is running.

looking like 4 blade maybe way to go or Hydrofoil? (I know that's probably a bad word around here and they look funny)

You guys do any trade / swap?? - the Mirage Plus Prop I have is in mint condition.

Thanks,
Jason
Reel Irie
Posted: Wednesday, April 20, 2011 6:40:16 AM
Rank: Member
Groups: Member

Joined: 4/18/2011
Posts: 10
Points: 30
Location: Clearwater, FL
they possibly suggested getting the prop cupped to be an 18 ....
Ken2
Posted: Wednesday, April 20, 2011 6:43:14 AM
Rank: Administration
Groups: Administration

Joined: 2/27/2007
Posts: 5,689
Points: 16,719
Location: Sarasota
With the motor that low, the hydrofoil will be dragging through the water. That will kill economy and speed.

You might want to look into a wedge. That will allow you to trim the motor "down" more then you can now.

Raising the motor and going with a 4 blade would give the best results.

When I need a prop, I take trades, but we are almost always stocked up on Mirage Props. They put them on about everything, so thats what everyone starts out with.
But they sell quick on Ebay, and right now is the time to be selling them. All the guys up north are thawing out their boats and getting ready for summer.
Reel Irie
Posted: Wednesday, April 20, 2011 6:58:47 AM
Rank: Member
Groups: Member

Joined: 4/18/2011
Posts: 10
Points: 30
Location: Clearwater, FL
one more question -- if I am running a Mercury Prop now, do I still need a hub kit for the Rev 4 ?
Ken2
Posted: Wednesday, April 20, 2011 7:03:01 AM
Rank: Administration
Groups: Administration

Joined: 2/27/2007
Posts: 5,689
Points: 16,719
Location: Sarasota
Nope, its the same hub for all Merc props. so if your running that Mirage, you've got what you need.
Reel Irie
Posted: Wednesday, April 20, 2011 7:06:43 AM
Rank: Member
Groups: Member

Joined: 4/18/2011
Posts: 10
Points: 30
Location: Clearwater, FL
ok thanks, I'm gonna make some runs / testing this weekend and see if I think I really need the change .....

thanks for your help, Ill be in touch

Jason
Reel Irie
Posted: Friday, April 22, 2011 4:46:59 AM
Rank: Member
Groups: Member

Joined: 4/18/2011
Posts: 10
Points: 30
Location: Clearwater, FL
Had a chance to go out yesterday and look back there .... motor is defiantly buried, could not really even see top of anti ventilation plate.  Water flowing over it ...

so now the dilemma::

raise the motor and see what happens? (1 or 2 holes up?)
get a Rev 4 with motor at current height and see what happens?
or both? or in which order should I make the changes.....
Ken2
Posted: Friday, April 22, 2011 5:03:15 AM
Rank: Administration
Groups: Administration

Joined: 2/27/2007
Posts: 5,689
Points: 16,719
Location: Sarasota
If the problem was as bad as it sounded. you having to run almost full tabs, your not going to completely solve it by raising the motor one or two holes.

It will help.
But I think your going to need the combination of both to get the results you want.

Even if you get the Rev 4, I'd still change one thing or the other and go for a test run just so you can see what is doing what.

It takes about 2 weeks to get the Mercury prop in, so its up to you.
Ken2
Posted: Friday, April 22, 2011 5:04:16 AM
Rank: Administration
Groups: Administration

Joined: 2/27/2007
Posts: 5,689
Points: 16,719
Location: Sarasota
There is also the Powertech OFS4 which is a good all around 4 blade. It gives a lot of sternlift as well. Actually a little more then the Revolution 4.
Reel Irie
Posted: Friday, April 22, 2011 5:16:47 AM
Rank: Member
Groups: Member

Joined: 4/18/2011
Posts: 10
Points: 30
Location: Clearwater, FL
Thanks

Can you give me a quote on what I need for both props?  Will I need a hub kit with Powertech?

You can email me at reel.irie@gmail.com

Thanks,
Jason
Ken2
Posted: Friday, April 22, 2011 5:28:10 AM
Rank: Administration
Groups: Administration

Joined: 2/27/2007
Posts: 5,689
Points: 16,719
Location: Sarasota
Rev 4 is $489 your already running a Merc prop, so you have the hub you need.

The Powertech cost $479 and its normally made to run with the stock yamaha thrust washer. Which you may not have anymore.
But I could have it hubbed for a Mercury and that would probably work. Doesn't cost any extra for the hub.
Reel Irie
Posted: Monday, April 25, 2011 10:20:37 AM
Rank: Member
Groups: Member

Joined: 4/18/2011
Posts: 10
Points: 30
Location: Clearwater, FL
any advice on raising the motor at home?  I am going to do the trailer jack trick .... my main concern is the current sealant (5200?) on the boat, breaking it / scrapping off and then how to reapply the 5200, if I am actually not removing the motor completely...
Ken2
Posted: Monday, April 25, 2011 6:30:25 PM
Rank: Administration
Groups: Administration

Joined: 2/27/2007
Posts: 5,689
Points: 16,719
Location: Sarasota
Yea, 5200 isn't what you want to mount a motor with. Thats not going to be fun.
4200 is the what I normally use. Its not as "permanent"

I normally use a floor jack with a piece of wood under the skeg. I'm sure many people would cringe at that, and say you need a lift. But it has worked on a few boats that I've set up.

We get the jack under the motor. Loosen all 4 bolts, and shake it around a bit to break it loose of the transom. (this isn't going to be as easy if its on there with 5200)
Once its loose. we take the top bolts out, Bottom bolts are just loose, jack it up, and put the top bolts in where they need to be.


I goop 4200 all over the bolts that are going through the transom and make sure the holes in the transom are sealed up perfect. But I don't put any sealant between the motor and the transom.
Users browsing this topic
Guest


Forum Jump
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

Main Forum RSS : RSS

YAFVision Theme Created by Jaben Cargman (Tiny Gecko)
Powered by Yet Another Forum.net version 1.9.1.6 (NET v2.0) - 11/13/2007
Copyright © 2003-2006 Yet Another Forum.net. All rights reserved.
This page was generated in 0.661 seconds.
27 queries (0.143 seconds, 21.63%).

yaf_pageload: 0.035
yaf_replace_words_list: 0.003
yaf_topic_info: 0.003
yaf_forum_list: 0.004
yaf_forum_listpath: 0.002
yaf_forum_listpath: 0.003
yaf_post_list: 0.017
yaf_usergroup_list: 0.003
yaf_usergroup_list: 0.003
yaf_usergroup_list: 0.012
yaf_usergroup_list: 0.003
yaf_usergroup_list: 0.003
yaf_usergroup_list: 0.003
yaf_usergroup_list: 0.003
yaf_usergroup_list: 0.003
yaf_usergroup_list: 0.003
yaf_usergroup_list: 0.004
yaf_usergroup_list: 0.004
yaf_usergroup_list: 0.003
yaf_usergroup_list: 0.004
yaf_usergroup_list: 0.003
yaf_usergroup_list: 0.003
yaf_usergroup_list: 0.003
yaf_usergroup_list: 0.005
yaf_usergroup_list: 0.003
yaf_usergroup_list: 0.004
yaf_active_listtopic: 0.004