One thing a foil does very well (and in no way is the fitment for this purpose compensation for a shortcoming) is to reduce the clean planing speed allowing the boat to hold its plane (and therefore hyrdonamic lift and stability caused by the planing) at a speed better suited to poor conditions.
Cheers
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Boat: Seafarer Vagabond
Live: Great South East....love Moreton Bay fishing
Give a man a fish & he will eat for a day !
Teach him how to fish
& he will sit in a boat - & drink beer all day!
TEAM MOJIKO
Well I don't think it's good skippering 'full speed and crossing a river cat wake at a angle', Foil or no foil a small tinnie is going to react adversely. You should have slowed down and taken the wake head on.
Tends to cast doubts on your other claim of broaching in following seas. Perhaps it was poor driving as well. The idea sounds a bit far fetched ie 'following waves acting on the foil'. A following sea will tend to push the boat as it has the whole stern to act on. The trick is to have enough up trim to stop the bow digging in and an appropriate amount of power to maintain steering.
Big E, can you relabel this post as "foils - urban myths or not" reckon it'll go to 18 pages but hoping not though as the popcorn has run out and beer supplies getting dangerously low. 😉
PS, this post from 2006 only went to 3 pages 😅
http://www.ausfish.com.au/vforum/sho...r-SE-sport-300
Oops.... my bad.😂😂
mid river wakes are nothing serious closer to the shore they are quite large and full speed on a 15hp and that hull is only 35-40kph
i continued to drive like that 3-4 times a week during summer over another few years and no issues with the foil gone and even greater hp
all i am saying these things can happen.
dont really care what people think about my skippering i use mine more then most 2-3 times a week and am comfortable with my boats
Scott,
Whats your opinion on mercury's use of the command thrust gearbox, in particular to there 115 hp size, which is effectively using the same
gearbox as there 150 hp, which means it swings a much bigger prop. From what I've heard about them, there advantages are to give more bum lift, and suppose to push it up on the plain quicker etc etc ?
I ask this, in relation to the discussion on foil/tab advantages.
One of the things I struggled with, with my previous set up with the reef finder, hole shot was never a problem, was getting it to nose down in that certain wave set, which meant on/off the throttle all the time and trolling at that certain speed which it just liked to sit down in the arse all the time. There was nothing wrong with the power to weight with the old 125 4 cylinder Merc, but just couldn't get the boat to sit right at that 8-12 knott trolling speed and was horribly un economical being a 2 stroke. I was always going to try putting tabs or a foil on, before the rebuild had to happen, but now I'm getting close to working out the transom fittings and indeed which motor to slap on, these command thrust models are spruking my interest.
just interested in opinions of there benefit with this option..
Col
Guess it's along the same line of the Zuke's just a different way to get there - bigger prop doing less revs being more efficient - at a guess due to less slip in the mid RPM range. Similar to what I found with my last prop choice - less top end though and the efficiency pretty much draws even at high RPM if that's a concern. A foil, tabs or possibly even both depending on just how slow you want to get up on a clean plane should help for sure - whether you will get as low as 8Knots though in a glass rig is debatable and probably very dependent on hull efficiency as well. On the 4.5 tinnie it wasn't an issue but the Vic minimum efficient clean plane speed is about 18 knots - below that I have so much tab and negative trim on that the fuel burn starts to creep back up.