I had one one my tinny, it was maybe a little more stable when people walked around under power, but in a following seas there was a nasty kick as the wave went through.

My boat worked better with it off than on, and was certainly less dangerous IMHO. I think you can get at least some of the benefit and none of the negative by going up a prop size.

ive got one on my 445 have tried with out it its def more stable at rest

 it was on boat when i bought it had a 55 yami 2stroke

the boat didnt plane well didnt know this untill i got boat mechanic to take it for a test , got the prop changed and was like different boat

and fuel econmy changed for the better

now have bf60 honda 4stroke i kept the foil but got the no drill kit for it works good

if your boat goes well leave it as is if you think somethings not right get someone with boat expiance to come out with ya for a drive

They are an absolute last resort to have one fitted. They can make your boat worse than it is now. In a following sea as Till says it can cause the boat to broach badly. A good mate of mine fitted one to his 30 hp Yammie and 4.2 tinny and it was that bad he took it off while out on the water, not risking the drive back in.

If you fit one be prepared to have your boats handling change dramatically and in most cases for the worst. If they are so good why are they not built on as a standard fitting?

Umm I starting to back away, as I said she handles nicely now so no need to change anything was just looking as an improvement.

Cheers everyone

Dave

It's true what there saying, I personally only ever use permatrim, There nothing like the plastic ones, Here's a link:http: //www.marinedoctor.com.au/index_files/Accessories.htm , Click on permatrim,

There more of an extension and don't dig in like the others, Also spread the load better so it dosen't crack your cav plate.

If the boat trim's fine leave it...

Or put a set of 5 deg Wedges on it.

Sonny

i think the guy at hayway has given you some great advice a mate of mine went for a not so nice swim because of one of those bastard things i would say stay away

 I purchased a new 6.1 Ally Boat in Bunbury a couple of years ago, designed and built in Bibra Lake. After a few months I complained to the guy I bought it off about  a couple of things, pounding and very slight porpoising at times which you could never seem to stop, even with altering trim. I took a 4 month fishing holiday in Carnarvon and this boat really started show how bad it rode and I made  a complaint to the guy about how bad it really was and it was a dud. We fitted a wedge, and dropped the motor one hole and it didnt work at all. Ended up coming back to Bunbury and the seller took it for sea trials and then asked me for permission to fit a Permatrim Foil. I agreed and it really has changed the boat for the better, planes at lower speed, pulls the nose down easily with trim and absolutely no porpoising and no broaching in following seas. I have since been back up there and noticed a huge difference in handling that sea.  I am absolutely impressed with the Kiwi Permatrim. I also used to own a 19'6 Stejcraft years ago with a volvo inboard. I fitted a plastic stingray foil to that  and it used to plane on 1700rpm, prior to that it used to take around a minute to get out of the hole. With the foil fitted it just went straight on the plane with a quick squirt of throttle , so my experience in both times has been a big winner for me........Cheers!

The one on my Dad's Mercury was fitted before he bought it.  I've never really thought too much about it.  I wonder how it would go without it on there?

 I had a haines signature 650f with an old saltwater yamaha series 2 stroke. No matter what i did i could not stop it porpoising and the general ride of the boat wasnt what it should be. I tried everything - trim switch, shifting the loads and lifting and dropping the outboard. In the end i took the plunge and got a permatrim. And it fixed it.

The permatrim was made out of about 8 - 10mm aluminum and bolts to your cav plate. it stopped the porpoising and the boat did stay on the plane longer, handled better in following seas and  it actually turned better aswell. And the bonus is you can use the plate as a step.

Think of the foil as an extension of the cavatation plate on your outboard, all it is doing is keeping a bit more water around your prop, which is a good thing and provides more of a platform for the arse end of the boat to sit on when travelling along.

The hardest thing was having to drill the 8 holes in the cav plate of the outboard. i must have sat there looking at it for 2 weeks before  i had a few beer and got the courage up ! If i needed to, i would get one again. There wasnt any downside to my boat after it was fitted. 

If you do get one, go the permatrim and not one of the plastic fin looking things. And if you find out it dosent work for you, just take it off.

No change hear sorry. I hate the perma trim. I've never had any success.

I only like the SE Sport hydro foil. The unit that is curved down on the sides. You set up i would think should be fine as it is though with out one. Another point to check is what revs you get? If you have too big a prop you could struggle to hold trim also.

Rod

try  getting a better pitch prop,, constatine at solas will let you try a prop b4 you buy. you jus tneed a alloy for the 2 stroke, alot cheasper.

 got an se hydro foil in my garage of 1 of my old boats in good condition,sell it cheap if any1 wants it,just pm me

i have had several units on various boats , my latest is 6.2 mt trailly CCab which is rear end heavy sometimes struggles to get up on the plane, i have fitted the curved unit as per Rod P said and found it to be fairly good , it gets the rear end up quick , but will work against you in the following sea as it will keep the bow down, i have not noticed that it cases broachingor assist when at anchor , i have bolted mine on and taken it off several times and it only leaves 4 holes on tha cav plate. i do have trim tabs as well but IMO theres more advantages in my case to leave it on

Hi

I used to have a 4.7m pacemaker with a 140 yammie on the back.It sounds like a lot of power but I used to be into barefoot skiing as well as fishing and diving.I had a foil on the motor [tigershark brand]and it was very usefull when  travelling up to about 15 mph as in towing a kneeboard or sounding.

It stopped the boat from dragging its bum  at low speeds keeping in mind the bigger heavier motor made it more inclined to do so.At higher speeds it did not have much effect and idealy they should be on top of the water when going fast to reduce drag.On this boat i actually had the foil spaced up about 35 mm higher to get it clear of the water at high speeds other wise i lost a couple of mph.Had 54 mph so shouldnt complain

Gary