JAE GAS RIGGER ?

[DaveMarles]

A wedge on the out side of the left sponson will help lift the out side sponson setting the right side in a turn.

I know what the heck am I talking about?

David

I knew that, just trying to find out how much of a wedge. Didn't realise that you ran a JAE.

 

[dwilfong]

A wedge on the out side of the left sponson will help lift the out side sponson setting the right side in a turn.

I know what the heck am I talking about?

David

I knew that, just trying to find out how much of a wedge. Didn't realise that you ran a JAE.

My buddy Mike has bin fighting with his for some time.

Not the wedge you are thinking about.

:huh:

 

[Ian Inverarity]

David,

I dont understand what you are trying to show there? :huh:

 

[dwilfong]

David,

I dont understand what you are trying to show there? :huh:

Drawing is looking at the transom of the sponson.

Small pick looking thing is the shape looking from the top of the wedge.

as the water rides up the wedge from lateral movement it hits the bottom of the sponson creating lift.

the triangular shape of the wedge from front to back helps the boat track strait and funnels the water up on the wedge.

Adding dihedral to the out side of the sponson also help. but need to keep the flat surface on the out side bottom edge to have a lifting surface.

This also gives a air gap and a very small weted surface when up on plain.

 

[Ian Inverarity]

David, has the wedge thing been tried? Looks interesting.

 

[dwilfong]

David, has the wedge thing been tried? Looks interesting.

This was done over 25 years ago.

Works good.

Have even a more advanced design being tested but the nondisclosure prevents me from making it public.

Lest just say the turn fin may be a thing of the past as we understand it.

Testing will tell the story very soon.

 

[Ian Inverarity]

Good to hear it works well.

I remember reading comments about a sponson design to eliminate turn fins, maybe in '99-2000. Didnt hear any more about it. But if you were going to do it all with sponsons rather than turn fins, the sponson would not want to hop out of the water in rough water in turns! :blink:

 

[dwilfong]

Ya I know testing and racing are two different worlds.

Hydro foils on the back should help the new design.

Finishing up the new sponson for testing. only bin a year in the making. :lol:

One step at a time.

The wedges are easy to make and just glue on to test. If thy don't work just knock them off.

Try it you may like it.

 

[John Finch]

How much do I cut off the left sponson for this non trip? 6mm side and bottom or more ? How do I get a Dick Tyndall turn fin?

Note the non trip is the left side of the sponson that is not covered with black and white checkers............



John

 

[Christian Lucas]

Hi,

with a standart turn fin you have a passive device that controls your sliding at the bow .To much slide must be adjust by a bigger fin . Wy not run a activ turnfin ,that can be angeled like a ruder at the stern ? so you can run a smaller fin with less drag that gives higher hold force in corners . Maybe made like a ruder with a hinge or bend the holder . i think also about a retractable fin that is ready angeled some degree . I remember that Fabio Buzzi has run two retractable turnfin on his turbine powered hydroplane on the race Padova - Venice on the river Po that has right and left corners and he placed the fin behinde the right and left sponson for that. On the straight all fin are out for less drag.