Low drag under sail and maximum thrust under power
The 4-blade Flexofold folding propeller provides trouble-free handling by superior power in both forward and reverse.
Powerful hydrodynamic design provides efficient use of the engine. Despite the relative large propeller and 4 blades, the low drag makes your boat sail faster and allows the sails to stay up even in very light wind.
Helical gearing between the blades ensures a synchronized folding mechanism.
Protective cover over the gearing.
Easy replaceable anode
Large shock absorbers for a quiet opening of the propeller.
Special inner hub to protect the saildrive and gearbox from the propeller impact.
Mounting screws are pre-applied with Loctite for mounting above as well as underwater.
Water lubricated – no need for maintenance.
Propeller sizes
The 4-blade propellers for shaft installation is available in diameters of 15″ to 27″ – all in a wide range of pitches.
To be supplied for both LEFT and RIGHT turning shafts.
Compatible with…
The Flexofold propellers have a 100% fit on all common shaft diameters with ISO, SAE or IMP cones
ISO (European standard) = 1:10 cone
SAE (US standard) = 1:16 cone
IMP (British standard) = 1:12 cone
Tech.
Operating Instructions
When handling the assembled propeller, avoid being pinched by opening or closing blades.
Do not operate the propeller when close to people or animals in the water.
Stop the engine immediately if any strange sounds or vibrations are noticed coming from propeller.
Check that the propeller functions in both forward and reverse before each voyage.
Shift gears at idling RPMs only.
When sailing, the propeller must be stopped for the blades to fold/close.
With a mechanical transmission; stop the engine and put the transmission in reverse gear to prevent the propeller from turning.
With hydraulic transmission; while boat is moving forward under sail or due to momentum and engine is still running, engage reverse gear and shut down the engine.
Maintenance
The only maintenance required is to keep the propeller clean.
The pivot pins and gears are water lubricated, however, adding waterproof grease to the moving parts will help the folding and unfolding.
Disassembly
Disassembling your Flexofold propeller is just as easy as mounting it. Simply follow the mounting instruction in reverse order.
Flexofold Prop Puller
If you have a shaft installation, the hub might be stuck to the shaft cone.
In that case, we recommend that you use a puller.
The Flexofold Prop Puller is designed for use on all Flexofold 2-, 3- and 4-blade propellers.
You can buy the puller directly from Flexofold under Spare Parts.
How to use the Flexofold Prop Puller
Simply place the puller behind the pivot pins. A loose fit of the locking screws will prevent the pivot pins from falling out.
Now, turn the screw against the shaft end to pull off the hub.
Heating the hub where it´s attached to the shaft cone, will often help loosen the grip.
Propeller dimensions
Please be aware:
Unlike the general perception, even as little as 8-10 mm of free space between propeller and hull will be fine. However, this of course depends on the specific hull shape and less clearence will normally increase propulsion noise.
Due to the nature of the propeller construction, folding blades are positioned further aft than a fixed propeller (see hub length) and thereby leave more space between shaft and hull.
How to calculate the total length of the folded propeller:
Hub length, ISO standard shaft
Hub length (A), 2-blades
Hub length (A), 3-blades up to 23″
Hub length (A), 3-blades >22″ and 4-blades
22 mm shaft, 1:10 taper = 88 mm ≈ 3.5″
25 mm shaft, 1:10 taper = 120 mm ≈ 4 47/64″
35 mm shaft, 1:10 taper = 148 mm ≈ 5 53/64″
25 mm shaft, 1:10 taper = 110 mm ≈ 4 3/8″
30 mm shaft, 1:10 taper = 136 mm ≈ 5 23/64″
40 mm shaft, 1:10 taper = 157 mm ≈ 6 3/16″
30 mm shaft, 1:10 taper = 130 mm ≈ 5 1/8″
35 mm shaft, 1:10 taper = 146 mm ≈ 5 3/4″
45 mm shaft, 1:10 taper = 196 mm ≈ 7 23/32″
22 mm shaft, 1:10 taper = 88 mm ≈ 3.5″
40 mm shaft, 1:10 taper = 156 mm ≈ 6 9/64″
50 mm shaft, 1:10 taper = 206 mm ≈ 8 1/8″
45 mm shaft, 1:10 taper = 196 mm ≈ 7 23/32″
Hub length, SAE standard shaft
Hub length (A), 2-blades
Hub length (A), 3-blades up to 23″
Hub length (A), 3-blades >22″ and 4-blades
3/4″ shaft, 1:16 taper = 100 mm ≈ 4.0″
1″ shaft, 1:16 taper = 136 mm ≈ 5 23/64″
1 1/2″ shaft, 1:16 taper = 202 mm ≈ 8″
7/8″ shaft, 1:16 taper = 115 mm ≈ 4.5″
1 1/8 shaft, 1:16 taper = 146 mm ≈ 5 3/4″
1 3/4″ shaft, 1:16 taper = 210 mm ≈ 8 9/32″
1″ shaft, 1:16 taper = 130 mm ≈ 5 1/8″
1 1/4″ shaft, 1:16 taper = 156 mm ≈ 6 9/64″
2″ shaft, 1:16 taper = 275 mm ≈ 10 53/64″
1 1/8″ shaft, 1:16 taper = 142 mm ≈ 5 19/32″
1 1/2″ shaft, 1:16 taper = 194 mm ≈ 7 41/64″
1 1/4″ shaft, 1:16 taper = 157 mm ≈ 6 3/16″
1 3/8″ shaft, 1:16 taper = 177 mm ≈ 7″
1 3/4″ shaft, 1:16 taper = 210 mm ≈ 8 9/32″
Hub length, IMP standard shaft
Hub length (A), 2-blades
Hub length (A), 3-blades up to 23″
Hub length (A), 3-blades >22″ and 4-blades
3/4″ shaft, 1:12 taper = 96,5 mm
1″ shaft, 1:12 taper = 116 mm ≈ 4 37/64″
1 3/4 shaft, 1:12 taper = 196 mm ≈ 7 23/32″
1″ shaft, 1:12 taper = 110 mm ≈ 4 3/8″
1 1/4″ shaft, 1:12 taper = 136 mm ≈ 5 23/64″
40 mm shaft, 1:10 taper = 157 mm ≈ 6 3/16″
1 1/4″ shaft, 1:12 taper = 129 mm ≈ 5 5/64″
1 1/8 shaft, 1:12 taper = 120 mm ≈ 4 47/64″
45 mm shaft, 1:10 taper = 196 mm ≈ 7 23/32″
Hub length (A), saildrive
2-blades
3-blades
135 mm
135 mm
Blade length (B)
2-blades
3-blades
4-blades
12″ = 139 mm ≈ 5 31/64″
14″ = 151 mm ≈ 6″
25″ = 275 mm ≈ 10 53/64″
13″ = 152 mm ≈ 6″
15″ = 163 mm ≈ 6 27/64″
14″ = 165 mm ≈ 6.5″
16″ = 176 mm ≈ 6 15/16″
15″ = 177 mm ≈ 7″
17″ = 189 mm ≈ 7 29/64″
16″ = 190 mm ≈ 7.5″
18″ = 202 mm ≈ 7 61/64″
17″ = 203 mm ≈ 8″
19″ = 216 mm ≈ 8 1/2″
18″ = 215 mm ≈ 8 15/32″
20″ = 227 mm ≈ 8 15/16″
22″ = 282 mm ≈ 11 7/64″
Propeller diameter:
12″ = 305 mm
13″ = 330 mm
14″ = 356 mm
15″ = 381 mm
16″ = 406 mm
17″ = 432 mm
18″ = 457 mm
19″ = 485 mm
20″ = 508 mm
21″ = 533 mm
22″ = 559 mm
24″ = 610 mm (3-blade propeller)
24″ = 625 mm (4-blade propeller)
25″ = 635 mm
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