Anyone running a hydrofoil on a stepped hull?
#31
Registered
#32
Ahhh, stupid me thought he was talking about a real hydrofoil, not a "whale tale." Sure, I've seen them used successfully in older cigarette straight bottom hulls supposed to help the porpoise quite a bit by providing a bit more lift, but that does not sound like the kind of problems the OP is having.
#33
VIP Member
VIP Member
Yikes
__________________
Formula 353
Merc Racing 540s
Formula 353
Merc Racing 540s
#34
Same problem on my Seafari 25. The brain trust doesn’t think the hydrofoil will do enough on the Seafari 25’ that’s a variable deadrise hull. Trim tabs have same issues as you noted above. One guy I know pulled a mold off hull to modify the tabs. I’m planning to install Volvo penta trim tab system that lowers a bar straight down from the transom to adjust ride. I’m toying with making an aluminum mounting plate with slots so I could raise and lower it to fine tune the final mounting point but I’m not sure it’s worth the effort.
The following users liked this post:
Gimme Fuel (03-30-2022)
#36
Registered
By “hydrofoil” I assume you’re referring to the fins that mount on the drives cavitation plate? What prop are you running now and how deep is the center or the propshaft below the bottom of the boat? If setup properly trimming up should alleviate the bow steering issue you’re describing, unless the prop is not deep enough, or contributing to the issue and lifting the stern because of wrong prop.
The following users liked this post:
SB (03-30-2022)
#37
Registered
I had a step hull 22 DONZI with a 3 blade on it. Can not remember the make or pitch.
I ran one of those hydrofoils that bolt to the cav plate and it did help it get on plane faster. Didn't seem to affect the high speed handling of that hull.
As for TABS not helping because its a short step hull, that makes no sense at all unless you are mounting them ski high on the transom. Post a picture of your transom straight on from the back. What exactly is the boat doing?
I ran one of those hydrofoils that bolt to the cav plate and it did help it get on plane faster. Didn't seem to affect the high speed handling of that hull.
As for TABS not helping because its a short step hull, that makes no sense at all unless you are mounting them ski high on the transom. Post a picture of your transom straight on from the back. What exactly is the boat doing?
Last edited by Wildman_grafix; 03-30-2022 at 01:58 PM.
The following users liked this post:
thirdchildhood (04-01-2022)
#39
Registered
Props can make a huge difference..... On my boat, I was running a 23 mirage, I tried a cleaver and I though I was going to die it was so squirrely. With the mirage it was always predictable and very forgiving.
doubled the hp, raised the drive 2.5" and went to a 4 blade, it runs very flat and stable, if I try to trim it upit starts getting squirrley. I have a different 4 blade to try this summer with the bell cut off to decrease stern lift.
Too much stern lift can be a problem.....
doubled the hp, raised the drive 2.5" and went to a 4 blade, it runs very flat and stable, if I try to trim it upit starts getting squirrley. I have a different 4 blade to try this summer with the bell cut off to decrease stern lift.
Too much stern lift can be a problem.....
The following 4 users liked this post by phragle:
#40
If you guys don’t have or have never had a stepped hull, I’d appreciate it if you just let the guys with stepped hulls talk.
Not mine but it’s the same hull, rides on a pocket of air… do you see why I’ve said that trim tabs won’t work besides the fact that I talked to owners that said they didn’t help
Not mine but it’s the same hull, rides on a pocket of air… do you see why I’ve said that trim tabs won’t work besides the fact that I talked to owners that said they didn’t help
Last edited by Prestigeworldwideee; 03-30-2022 at 08:19 PM.