WELCOME TO RIVER DAVES PLACE

Trim tab offset mounting distance

Bobo57

Well-Known Member
Joined
Aug 24, 2019
Messages
64
Reaction score
39
Hi all,
Getting ready to install larger trim tabs on the Schiada. The manufacturer recommends 3/4 inch offset from the bottom of the hull surface.

Can anyone here enlighten me as to the reason for the offset placement?

Thx
B
 

bjf66

Active Member
Joined
Sep 24, 2018
Messages
31
Reaction score
10
My boat is not factory made it was laid up as one off
So had no reference points
All the reading I done suggested the bottom tabs needed to be raised to protect any potential drag the tab could have if slightly lower mounted on transom

Due to contour of transom, had to cut down the transom mounted plates for K-280 as actuators were mounted with fab. Brackets

IMG_5452.jpg



Sent from my iPhone using Tapatalk
 

lenmann

Well-Known Member
Joined
Apr 13, 2013
Messages
858
Reaction score
1,068
My boat is not factory made it was laid up as one off
So had no reference points
All the reading I done suggested the bottom tabs needed to be raised to protect any potential drag the tab could have if slightly lower mounted on transom

Due to contour of transom, had to cut down the transom mounted plates for K-280 as actuators were mounted with fab. Brackets

View attachment 957507


Sent from my iPhone using Tapatalk
Holy Moly!!! What do you have going on there? A smallish, deepish v-hull, with a transplanted Arneson, and ...?

Give us some more pics of this hotrod and some details on the build please, looks really interesting. Educate us, after all it's in Victoria.
 

Bobo57

Well-Known Member
Joined
Aug 24, 2019
Messages
64
Reaction score
39
My boat is not factory made it was laid up as one off
So had no reference points
All the reading I done suggested the bottom tabs needed to be raised to protect any potential drag the tab could have if slightly lower mounted on transom

Due to contour of transom, had to cut down the transom mounted plates for K-280 as actuators were mounted with fab. Brackets

View attachment 957507


Sent from my iPhone using Tapatalk
Looks like your tabs are almost flush with the bottom surface....
 

bjf66

Active Member
Joined
Sep 24, 2018
Messages
31
Reaction score
10
Yes I think I got a little carried away
Used to offshore ski-race 30 yrs ago with 2 stroke Johnson V8 ( last 2 pics) now having heart transplant with 502-540 ci, twin turbo, crash gearbox, parallel drive to Arneson
Redone transom, stringers, made hatch, raised cap of hull so hatch sinks into deck
All engineering done, just pulled everything out in weekend and deducted and hosed out
Just need to finish wrapping fibreglassing around gunwale and then finish sanding
One the advantages of covid for me is not travelling and reclaiming some personal time to finish boat
IMG_6033.jpg


IMG_6032.jpg

IMG_3286.jpg

IMG_5488.jpg

IMG_4907.jpg



Sent from my iPhone using Tapatalk
 

bjf66

Active Member
Joined
Sep 24, 2018
Messages
31
Reaction score
10
Tabs are 20mm ( 0.75”) up from bottom


Sent from my iPhone using Tapatalk
 

bjf66

Active Member
Joined
Sep 24, 2018
Messages
31
Reaction score
10
Found this picture which may help as not often do you see the boats belly to get a clear shot at the K- planes
136188596_3644855842299959_9211624158900304422_o.jpg



Sent from my iPhone using Tapatalk
 
Top