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Hydrofoil suggestions?
#10982369
07/17/15 03:48 AM
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Joined: May 2015
Posts: 121
SStohner
OP
Outdoorsman
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OP
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Joined: May 2015
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We are looking at adding some hydrofoils to our 18 ft flat bottom aluminum sea ark boat with a 90hp Yamaha 2 stroke engine.
Anyone have experience with them? Positive or negative? Also suggestions on brands etc....
Thanks!
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Re: Hydrofoil suggestions?
[Re: SStohner]
#10983153
07/17/15 03:36 PM
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Joined: Jan 2005
Posts: 16,887
Pat Goff
TFF Guru
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TFF Guru
Joined: Jan 2005
Posts: 16,887 |
They are a bandaid for a poor setup. The right prop set at the right motor height is a much better answer.
Pat Goff Seadrift TX
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Re: Hydrofoil suggestions?
[Re: Pat Goff]
#10987392
07/19/15 11:47 PM
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Joined: Sep 2008
Posts: 120,965
hopalong
Pescador Loco
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Pescador Loco
Joined: Sep 2008
Posts: 120,965 |
They are a bandaid for a poor setup. The right prop set at the right motor height is a much better answer.
" Hop, set the hook"! hopalong 99,999 TexDawg 99,999 FJB! not my president by a long shot!
lake fork FISHERMANS COVE MARINA/reservations - 903 474 7479
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Re: Hydrofoil suggestions?
[Re: SStohner]
#10988278
07/20/15 01:40 PM
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Joined: Jan 2005
Posts: 16,887
Pat Goff
TFF Guru
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TFF Guru
Joined: Jan 2005
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Unless it's a tunnel hull which require a compression plate not a foil. Which is a different conversation.
Pat Goff Seadrift TX
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Re: Hydrofoil suggestions?
[Re: SStohner]
#10988902
07/20/15 06:02 PM
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Joined: Jul 2012
Posts: 159
K5RCD
Outdoorsman
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Outdoorsman
Joined: Jul 2012
Posts: 159 |
We are looking at adding some hydrofoils to our 18 ft flat bottom aluminum sea ark boat with a 90hp Yamaha 2 stroke engine.
Anyone have experience with them? Positive or negative? Also suggestions on brands etc.... Thanks! No one can give a definitive answer without more information. What if any, problem are you trying to solve? Also, does your motor have power trim/tilt, what propeller, what is your max RPM with current setup, fixed or portable fuel tanks, location of trolling motor and battery if any etc.? Some issues can be addressed by adding a hydrofoil, others are best resolved by changing prop, weight distribution, motor height on those setups that allow for that. A hydrofoil is not necessarily just a "band aid" as some may suggest. A description of your problems and some photos of your rig would help.
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Re: Hydrofoil suggestions?
[Re: SStohner]
#10988936
07/20/15 06:22 PM
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Joined: Jun 2003
Posts: 31,245
HasBen
TFF Guru
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TFF Guru
Joined: Jun 2003
Posts: 31,245 |
I noticed in your post you referred to "adding some hydrofoils" to your boat. A hydrofoil attaches to the foot of your motor, not the boat. Are you possibly thinking of trim tabs for your boat?
"Nothing spoils a good story like the arrival of an eyewitness."-Mark Twain
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Re: Hydrofoil suggestions?
[Re: SStohner]
#10990156
07/21/15 04:28 AM
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Joined: May 2015
Posts: 121
SStohner
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OP
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No we are not thinking about trim tabs. we took out to a guy near Fork that manufactures Jack Plates and does work on props, he was the one who recommended the hydrofoil. We recently got a tune up on the boat, the guy that did the work, near ray hubbard said we wouldn't need one after the tune up. We were having a hard time getting the boat to reach a plane when running on a lake. We don't really want to invest in trim tabs or a jack plate because it is a hunting boat that we happen to use for fishing and the trim tabs wouldn't fit with all the electronics we have on the back and the jack plate would require us to get a new custom boat cover which we recently got replaced. Most of the weight is in the back of the boat. It is a sea ark similar to the one on the top of this web page https://bfemc.sharepoint.com/Pages/SeaArkAluminumBoats.aspxit has power tilt, with a 90 hp yamaha 2 stroke engine. it has been hitting 4500 RPM but the guy that makes the jack plates said we should be getting 5500, we have not tested it out since the tune up to see if it is up to 5500. We are going out on Thursday. I do not know a ton more about the situation was just asking for my dad. I already let him know that it was a bandaid for a different issue but he was just wanting to research it a little bit more.
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Re: Hydrofoil suggestions?
[Re: SStohner]
#10990891
07/21/15 03:06 PM
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Joined: Jul 2012
Posts: 159
K5RCD
Outdoorsman
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Outdoorsman
Joined: Jul 2012
Posts: 159 |
I suggest you test the motor first, and see if the tune up gets you into the proper maximum RPM range. If so, that will likely solve your problem. If that does not resolve the issue, check your motor mounting height to have the anti cavitation plate flush with, or barely above the bottom of the hull. Also check your trim adjustment to make sure you are getting full trim down. Some motors have an adjustable rod or pin to limit trim range. If the motor is running properly, you may need a different pitch propeller to obtain maximum RPM.
If none of this resolves the issue, and you cannot readily redistribute any weight, then a fin such as the original Doel-Fin may take care of the problem. Let us know the outcome of the above before adding the fin though.
If you do need one, get one shaped like the Doel-Fin, (shaped like a wing, not one of the long narrow tunnel type, as they are for a slightly different application).
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Re: Hydrofoil suggestions?
[Re: SStohner]
#10990894
07/21/15 03:08 PM
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Joined: Jan 2005
Posts: 16,887
Pat Goff
TFF Guru
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TFF Guru
Joined: Jan 2005
Posts: 16,887 |
Ok, This gets easier. When you prop it to run at the proper rpms: 5,500 your holeshot problem will go away.
A foil on a flat bottom hull is a very bad combination, it makes an already ill-handling rig worse, by raising the transom even more, it will want to spin out a lot easier. Get with Steve at Steve's prop at fork, the correct answer is the right prop, which is a powertech 4 blade, with small vents, it'll do everything right.
If you decide that the foil is your answer, remember you're still not running at proper rpms, which puts a much heavier load on your bearings, and will shorten your motor's life. Band AID.
Pat Goff Seadrift TX
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Re: Hydrofoil suggestions?
[Re: Pat Goff]
#10990948
07/21/15 03:27 PM
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Joined: May 2015
Posts: 121
SStohner
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Ok, This gets easier. When you prop it to run at the proper rpms: 5,500 your holeshot problem will go away.
A foil on a flat bottom hull is a very bad combination, it makes an already ill-handling rig worse, by raising the transom even more, it will want to spin out a lot easier. Get with Steve at Steve's prop at fork, the correct answer is the right prop, which is a powertech 4 blade, with small vents, it'll do everything right.
If you decide that the foil is your answer, remember you're still not running at proper rpms, which puts a much heavier load on your bearings, and will shorten your motor's life. Band AID.
Steve is who made the suggestion of the hydrofoil, said the prop was fine, he also said a jack plate would help but like I said earlier the dilema we have with getting that installed.
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Re: Hydrofoil suggestions?
[Re: SStohner]
#10993239
07/22/15 02:59 PM
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Joined: Jan 2005
Posts: 16,887
Pat Goff
TFF Guru
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TFF Guru
Joined: Jan 2005
Posts: 16,887 |
You told Steve you were running 4,500 rpms? Somehow I don't think he got that pearl.
Pat Goff Seadrift TX
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Re: Hydrofoil suggestions?
[Re: SStohner]
#10993285
07/22/15 03:23 PM
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Joined: May 2003
Posts: 11,586
gary purdy
TFF Guru
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Pat he hasn't even tested it since the tune up to know what rpm`s it is turning.
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
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Re: Hydrofoil suggestions?
[Re: gary purdy]
#10993499
07/22/15 04:55 PM
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Joined: Jul 2012
Posts: 159
K5RCD
Outdoorsman
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Outdoorsman
Joined: Jul 2012
Posts: 159 |
Pat he hasn't even tested it since the tune up to know what rpm`s it is turning. That doesn't matter to Pat. He is more interested in defending his shoot from the hip "band aid" comment, than in paying attention to the issue. "Let go of your attachment to being right, and suddenly your mind is more open. You're able to benefit from the unique viewpoints of others, without being crippled by your own judgment." -- Ralph Marston
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Re: Hydrofoil suggestions?
[Re: SStohner]
#10994246
07/22/15 10:30 PM
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Joined: Jan 2005
Posts: 16,887
Pat Goff
TFF Guru
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TFF Guru
Joined: Jan 2005
Posts: 16,887 |
It's turning 4,500. Without anything else that statement is automatic you've got the wrong prop. Now if your tune up finds a thousand rpms you'll probably be happy with the holeshot.
Pat Goff Seadrift TX
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Re: Hydrofoil suggestions?
[Re: SStohner]
#10994872
07/23/15 02:51 AM
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Joined: May 2015
Posts: 121
SStohner
OP
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Ummm. Steve is the one who pointed out it should be running 5500 not 4500....
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