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Parts & Assembly:

 

 

The DOL-Fin Orca Mk-2 monofin consist of the following parts: 

 

Foot Binding Straps 

(1 matched set) 

a.

 

Strap Spacers 

(2) 

 

Orca Body   

(1) 

a.

 

Fairing Top 

(1) 

b.

 

Fairing Bottom 

(1) 

c.

 

Foot Plate 

(1) 

d.

 

Orca Bracket 

(1) 

e.

 

Internal Float 

(1) 

 

Suspension Straps 

(2) 

 

Top PE Suspension Guide* 

(2) 

 

Bottom PE Suspension Guide* 

(2) 

 

High Aspect Ratio Fin 

a.

 

Aluminum Hydrofoil 

(1) 

b.

 

PE Fin Tips* 

(2) 

c.

 

Internal Bungee System 

(2) 

 

Hardware 

a.

 

12x1.5” SM Screws 

(6) 

b.

 

1/4x1/8 Isolation Washers 

(6) 

c.

 

6-32x1.125” Machine Screws 

(8)  

d.

 

6-32x0.5” Machine Screws 

(5) 

e.

 

6-32 Nylon Locking Nuts 

(11) 

f.

 

PE Twin Screw Washer Plates*  (2) 

g.

 

Al Twin Screw Washer Plates*  (2) 

* Note:

 PE is short for Polyethylene and Al is short for Aluminum, the material the parts 

are made from. 

 

The DOL-Fin Orca Body is the structural support between the high aspect ratio fin and the 
swimmer's  feet.   

Figure  1

  shows  the  Orca  Body  as  seen  from  its  underside  with  the  fin 

suspension systems installed and labels some important features.  As it is shown in Figure 
1, only the fin needs to be attached to complete the monofin.

 

 

 
 
 
 
 
 

 

 

 

 

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Installing the Foot Binding Straps: 

 

The Foot Binding Straps are user replaceable and can easily be removed by disassembling 
the Orca Body and removing the aluminum Foot Plate.  To install new Binding Straps, 
feed the straps through the strap slots in the foot plate and adjust as needed for a proper fit.  
Strap Spacers are provided to shorten the effective length of the straps for smaller feet.  
Once adjusted, screw the Foot Plate into the Internal Float.  This action locks the Foot 
Straps into position on the Foot Plate.  YouTube video

 “DOL-Fin Orca Mk-2 Monofin - 

Foot Strap Tutorial”

 shows this entire assembly process:  

http://youtu.be/U7iPuo9tnmg

 

 

FIG 1 

 

 

Summary of Contents for DOL-Fin Orca Mk-2

Page 1: ... of the DOL Fin equipment to verify the structural and mechanical integrity of the unit to the swimmer s own safety and risk standards Even easy dives can become dangerous when equipment unexpectedly fails Never attempt to stand with both feet engaged into the DOL Fin as you will be unstable which can cause you to fall over and can lead to injury Be careful when using your DOL Fin around others as...

Page 2: ...ructural support between the high aspect ratio fin and the swimmer s feet Figure 1 shows the Orca Body as seen from its underside with the fin suspension systems installed and labels some important features As it is shown in Figure 1 only the fin needs to be attached to complete the monofin 4 of 16 Installing the Foot Binding Straps The Foot Binding Straps are user replaceable and can easily be re...

Page 3: ...nations are offset from the centerline of the Suspension Strap This offset is visible by looking at the side edge of a Suspension Strap To properly mount the Suspension Straps to the Orca Bracket the nylon laminations should be offset away from the Mounting Tabs on the bracket and close to the fin as depicted in Figure 3 Mounting the Suspension Straps upside down will affect the fin s angle of att...

Page 4: ...evel of energy transfer to the monofin the straps do not have any padding attached to them and instead rely on padding worn on the foot to eliminate chaffing of the straps on the foot If a dive sock is not available a cotton gym sock will do almost as well The more padding between the foot and the strap the more movement is possible and the less connected the foot will be to the fin So adding stra...

Page 5: ...s body more streamline for drag reduction and speed The fin motion produces alternating patterns of starting vortices of the oscillating fin which forms a reverse Kármán vortex street to focus a powerful jet of water flowing through the volume affected by the fin as illustrated in Figure 4 The fin motion is shown in black The reverse Kármán vortex street and resulting flow of water are shown in gr...

Page 6: ...ing to remember is that the DOL Fin is a Dynamic Oscillating Lateral Fin not a Dynamic Oscillating Skewed Fin The fin should always be stroked in a direction that is orthogonal 90 degrees to the span i e long axis of the hydrofoil fin If the fin is twisted in roll relative to the diver s upper body and the diver inappropriately strokes the fin orthogonal to his upper body rather than orthogonal to...

Page 7: ...the safest way to dive Be sure that you have appropriate clearances around you before starting your rolling back entry You don t want to injure others as you roll back or get your fin caught on anything in the boat 14 of 16 If the rolling back entry is not used an entry similar to a shore diving entry can be used whereby the diver first enters the water and then dawns the monofin Never attempt to ...

Page 8: ...his is a subtle method by which divers can optimize their fin s performance to their individual swimming style 16 of 16 Youtube video DOL Fin X 20 Fin Tip and or Bungee Replacement provides a complete tutorial on how to replace fin tips and or bungee assemblys This video can be accessed here http youtu be pJzDBW7KE2c The following explains the process in words To install a new bungee system begin ...

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