45 Hydro in a turn

[Ian Inverarity]

I'm going thru the ~9000 shots I took at the Winter Nitro Champs in FL and came across a 45 hydro making an interesting wake from it's turn fin, I've not seen this before. I have seen similar wakes from props where the blades strike the water, but not from a fin. Notice the vertical striping in the wake from the fin:

https://flic.kr/p/DgkfdC

 

[Steven Bryant]

Hmm interesting shot of the spray coming off the turn, I've never seen that before and would be really interested to see what people say is causing it. Nice pic......

 

[Tom Foley]

Looks like rod hendricks boat . i can only imagine it is flexing at a controlled frequency as it turns , maybe too thin or just right ?! Nice shot man !!

 

[ALLAN YUEN]

Look Who did run from Andy Brown 45 SGX?

 

[Ian Inverarity]

Tom, Thanks! It's Aron's boat from Alaska.

 

[charles siler]

Yes it's Arons new style 45 SGX that he bought from Jeramy Edge last summer.

 

[Andy Brown]

Yes, Aron's 2014 SGX 45. Jeremy won Atlanta with that boat (perfect score).

The turn fin looks like it must be turning 30,000 rpm. A strange phenomenon going on there.

 

[Ian Inverarity]

Of course there may be nothing bad going on there at all, I'm just curious as to what may be happening! I have taken a lot of boat pics and not seen that before...!

 

[Terry Keeley]

Something dragging in & out of the water maybe?

 

[KenOlvis]

vibration

 

[shann harrison]

Angle of the fin not set right.

 

[Elias Vazquez]

To me it looks like it could be the angle of the shot, and it is coming from the prop.

 

[Ian Inverarity]

It isn't the prop, I have another frame that shows this, but the vertical stripes are more visible in this frame.

 

[Niklas Edlund]

Doesnt this one also have the same "issue"?

https://flic.kr/p/Djnqhc

Sure looks a bit strange - my guess is also the that the fin(s) vibrate.

 

[charles siler]

I'm wondering if it's the smaller booms ?

 

[sbowden21]

Doesnt this one also have the same "issue"?

https://flic.kr/p/Djnqhc

Sure looks a bit strange - my guess is also the that the fin(s) vibrate.

This is my boat... Never notice these things while racing...

 

[Niklas Edlund]

Doesnt this one also have the same "issue"?

https://flic.kr/p/Djnqhc

Sure looks a bit strange - my guess is also the that the fin(s) vibrate.

This is my boat... Never notice these things while racing...

Thats why it's so good to take lots of action photos so one can actually see what is happening. There is no way one could see stuff like this while racing.

 

[John Beardslee]

Do you think the water condition might have some influence on the affect shown in the photo?

Thanks, John

 

[Ian Inverarity]

Doesnt this one also have the same "issue"?

https://flic.kr/p/Djnqhc

Sure looks a bit strange - my guess is also the that the fin(s) vibrate.

Yes, this boat and others do show it a little, just not as clearly as Aron's boat! I was going to link that pic but you beat me to it!

 

[Terry Keeley]

Clearly not something dragging from Nik's shot.

Maybe fin "flutter", similar to control surfaces on aircraft?

Check this out at 5:30 & 5:58: