Anyone care to cast light on this.
Fi-Glass Warrior (early model) has distinct left lean when planning.
Believed it was son-in-law who is the regular crew and weighs 'several' kg's more than I sitting in left seat.
Never noticed issue when I was out alone.
However, yesterday I had my daughter in left seat. She is lighter than I and considerably less than S-i-L. Boat had the distinct left lean again. Although I did only noticed attitude on return trip as sea had roughed up and consequently I trimmed motor down!
All equipment on boat is distributed equally and fuel is in central underfloor tank.

Boat is powered by Johnson 115hp Ocean Pro. No trim tabs but has hydrofoil (already fitted when I bought package).

Coincidently, I had read recently that a hydrofoil can cause stability problems.

Be keen to know what thoughts on this issue are out there


Thanks

Yes clarification required as above...
 If a 'wheel alignment' type pull  as Smudge describes above.
 The fin is very sensitive, and set to keeping straight at your ave cruise speed... or maybe a troll speed if do a lot of that.
Outside the speed you set it at, it will still pull (steer) one way or the other a little.

Adding a permatrim and if that has not been fixed EXACTLY square, will also cause issues.

 If it is the boat on a lean, one way or the other, and still leans... check your floatation compartments.
 These usually have drain plugs.
With older boats, espec keel boats, the screws that hold the brass keel strip on can work loose, or if installed with screws too long and loose, cause a seepage into the bilge , not be noticed as that part of the bilge is also part of the sealed compartments.
 The screws that usually cause the issue are the front 1/2 of the boat.

Basic check for keel/ hull leaks can be done at home.
 Remove the compartment plug, stick the garden hose in with a rag stuffed around it, and fill up as best you can as much water....replace the bungs.
 Make sure the bungs have a good O ring around so they seal.
 then sit back and check the hull

 If they dont, so many old bungs (and fuel filler cap water in the tank after a rain) they have long gone. No having the O rings, the compartments will drain between trips, so initially on the way out, may not notice the lean..

If it is the keel screws, its not a difficult or rocket science to repair.

 PS if you do have a slight weeping drip.. then think " hey that would not let enough water in on a trip"  that leak is under water and even a 100mm or so below is enough to force water in at a surprisingly fast rate.

Thanks Steps for the reply.
Yes while coming in yesterday I was thinking that perhaps I had sprung a leak in the left chamber or I had not fitted bung properly.
However as soon as I stepped on the jetty and before boat was recovered, I stood directly behind her. She was perfectly level all round.
There used to be problems with the air chambers especially the left one. Caused by previous owner/s indiscriminately drilling into floors above chambers. They have all been fixed.
I open all bungs immediately after recovering boat and those chambers are dry.
Can I ask your opinion of the hydrofoil (or permatrim as you call it)
After reading that article, I was considering removing and wondered why it had been fitted in the first place!

A thought..
Keep in mind Im not familar with the F glass design of compartments.. but if similar to other lay outs....
 There are 2 compartments on the bow , under the cabin floor .
 These drain, have bungs going back into where the under floor fuel tank is...may require lifting the floor over the tank, and may require sliding the tank to the stern a couple inches t get at the 2 bungs.. one for each side...
 If the tank will not side.. I use a trailer tie down.. chances are there is a stop at the stern end of the tank to stop it moving backwards on one side ot the other.
Then there are the other 2 compartments each side of the boat, each side of the fuel tank, that have bungs going into the bilge at the stern.

I dont think many ppl know about the 2 compartments and bungs up in the cabin area....
 On older boats with a few stresses over the decades.. if the front or a front compartment fills, it can seep into the side compartment behind it.. with a tell take water coming out when remove that bung. If dont know about the cabin compartments and leaks enough to fill a front compartment one can chase in cicles trying to find the source of a small leak.
I only know this stuff from the old mans boat back in the early/ mid 60s, and my 1st boat in the 70s. And applied that to when on returning home had  about a L drain out of the rear stern bung when removed at home with all the other bungs removed 1st jockey wheel high up.
 That litre was after a good 8 hrs out and after wash down, and a dive while out on the water.
Any more than a couple cup fulls after all of the above I will then worry... Dont get even that...the stern bung is slightly higher than the bottom of the bulge so dont get to fill that  space enough.

Yes it appears square.
Boat is not exactly sitting square on trailer. But a straight edge and spirit level from combing to combing matches bubble reading across the flat of the foil!

Hmmm. Under powered. Not sure a 115hp that is running OK is under-powered for boat. Weight including fuel+crew+gear is around 1500kg.
Prop is 14.5/19".
I've done the WOT/RPM which came in well within range attaining near 48kts@5000 RPM (did not like the fuel consumption though!)

AS to correct height. Now that's one that is outside my meagre knowledge on these issues.

The engine is mounted so there is a gap between top of transom and engine. See photo
Also pics of position of prop in relation to transom




I can only assume that boat pre-dates motor and this was the best solution.
I had the transom repaired and this was more or less confirmed by the person who did that work because he mounted the engine the same!

No forward compartments to worry about.

Could it be windage that’s making it lean, you mentioned that it happen only on the way home and it had chopped up.... wind can lean a boat pretty easy

I remember that Napier afternoon sea breeze only too well. Great when we were having our sailing races but PIA when fishing my 16ft Fleetline. Always started really early with the aim to be back by midday if it was a typical hot summer day. At 10 -12knts though you weren't getting it too bad. With a SW course home I assume you were up wide of the Flat Rock area or in that direction somewhere? If so, the sea-breeze will have been on your port beam somewhere so yes that could easily be your lean to port. Swell was more likely SE rather true S (?) if it was a typical Napier swell and that could also have been pushing you to maintain a subtle port turn (which is what the wind does to make you lean). Doesn't mean that this is your problem, but the conditions you describe could certainly be contributing. Hows the fishing in Napier now? Used to be my favourite Gurnard fishery when I lived there, but don't tell Smudge. He think the Manakau is Gurnard heaven.

I've used foils and perma trims generally with great success, solving the problem of keeping the boat on the plane. But the last one I used did lean to the left as well.

My Frewza F14 fisher did the same. Leaned slightly to the left when on the plane. Became unnerving for a while,not knowing the cause.