Turn fins installed (pics)

[jamespl]

i got my turn fins today and installed them, i think they look pretty smart lets just hope they do the job now!

[Rumdog]

You need to install them so they are perpendicular to the bottom of the hull. When the boat banks to one side in a turn, you want the fin straight down in the water, or it will cause lift and may make it turn worse. So, bracket at the same angle as the trim tab bracket.

[Chilli]

What Ryan said. You want the fins perpenducular to the water's surface when the hull is leaning into the turn.

[bwells]

Should the fins extend below the Vee or even with it? Don't mean to interrupt!

[jamespl]

I wasn't sure how to angle them, should of asked first. I have just taken the boat for a run and with the strut angled down slightly and the batteries in the middle rather than side by side the boat runs much more smoothly and the turn fins have really made a difference even if they ate angled wrong but to be honest it handled that bad that anything would help. I'm only a sport boater so I will leave them as they are for now. I'm constantly learning and i have found that even small adjustments can make a big difference in a good or bad way.

[Chilli]

James, As long as your happy how the boat runs, thats cool. You never stop learning in this hobby.

Brian, Ideally you want as much of the the turn fin out of the water as possible when the boat is running straight because a fin in the water when you don't need it creates drag. The fins job is to keep the stern from sliding or spinning out in a sharp turn. So you need to find that balance between the fin doing it's job in the turn without slowing you down in the straights. Obviously for sport boating it's not as big a deal.

Here is a pic of the transom of my gas boat whe I was building it. Obvioulsy the deeper the V, the easier it is to keep the fins out of the water.

[jamespl]

I might just bend the fin itself slightly rather than drilling more holes in the hull to bring them into a slightly better position.

[JEDNJONES]

Those look very good on your P1. Good job.

[forescott]

Are those the small or medium fins??

[jamespl]

Small. 52mm I think they are. Any bigger would be to big I think.

[Skullcracken]

[QUOTE=jamespl;237416]i got my turn fins today and installed them, i think they look pretty smart lets just hope they do the job now!

How is yours running with two batteries. I am using one 4s and its tail heavy. Ive lowered the strut angle but I still have issues with coming out of the water. You?

[jamespl]

With the batteries in the position on the pics it was a bit tail heavy so I put one battery on top of the other and put them in the middle so basically flipped them 90deg and it ran so much better.

[JEDNJONES]

Or, you can cut out the small wood section holding the ESC and run the batts along the sides of the motor. Here is my setup....much more stable now.
Jerry

[wparsons]

I might just bend the fin itself slightly rather than drilling more holes in the hull to bring them into a slightly better position.

Chances of bending them totally straight without distorting the angle on them is pretty slim. I'd rather change the holes than try to bend it.

If you are moving them, you'll want them to be inboard a little bit too.

[forescott]

Got a pair of small turn fins on flea-bay for 8-bucks! They look really nice!

[b.mcdaniel.2009]

Or, you can cut out the small wood section holding the ESC and run the batts along the sides of the motor. Here is my setup....much more stable now.
Jerry

I did the same and it helped a TON. Running a x642 prop also>

[hobie]

How is yours running with two batteries. I am using one 4s and its tail heavy. Ive lowered the strut angle but I still have issues with coming out of the water. You?[/QUOTE]

I've been running both 2 pack and single pack config. never have had a problem with balance, when I run 2 packs, it's perfect. When I run a single 4s, I have to move it to where the middle of the 2 packs sit, always perfect in the balance.
What 4s pack are you running to have it tail heavy?? I have a 4200 4s 45c Hyperion.

[forescott]

Got my turn fins installed!!

[antslake]

I bought the same turn fins :)

[mimo169]

Got my turn fins installed!!

How many mm deep are those turn fins? They look perfect size for that hull...

[forescott]

They are approx 57mm top to bottom.

[VenomP1]

very nice i like the red!

[jd800]

My problem is I run along a beach shore with rolling waves and generally run along the waves, the hull comes down and it it appears the torque of the drive system (1.4x 32 x3 ) makes it unstable for a second or so sometimes causing it to roll over. Do you more experienced operators feel the these fins would help my torque situation and keep it more stable. Currently no issues steering, flush trim taps neutral on thrust angle.
BTW--2000kv 2x2s
Thanks in advance
JD

[JEDNJONES]

On mine, The turn fins just helped the steering. It does not spin out as easy in a turn. They added drag also, so it required a bit more power (5S) to keep it in the 55-60 mph range. It still has tons of torq roll and gets airborn and flips like crazy at those speeds. Almost lost it several times. It may be retired now. Still looks swet on the shelf.
Jerry

[wparsons]

I doubt turn fins will help much in that case, if it's rolling because of waves you don't have much you can do to stop it.