Review of Dehler 34 Mk II
Basic specs.
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Both the hull and the deck is made of hand laid fibreglass. Generally, a hull made of hand laid fibreglass requires only a minimum of maintenance during the sailing season.
The deck is a sandwich construction which improves the indoor climate. Especially when the water is colder than the air in the cabin, then the double hull insulates against cold water and reduce the condense water in the cabin.
The boat is equipped with 3 cabins, 6 berths, a galley, 90.0 liter fresh water capacity and toilet facility.
The boat has more than one rig.
One option is a fractional rig. A fractional rig has smaller headsails which make tacking easier, which is an advantage for cruisers and racers, of course. The downside is that having the wind from behind often requires a gennaker or a spinnaker for optimal speed.
Fin keel
The Dehler 34 Mk II is equipped with a fin keel. The fin keel is the most common keel and provides splendid manoeuvrability. The downside is that it has less directional stability than a long keel.
The keel is made of iron. Many people prefer lead keel in favour of iron. The main argument is that lead is much heavier than iron and a lead keel can therefore be made smaller which again result in less wet surface, i.e. less drag. In fact iron is quite heavy, just 30% less heavy than lead, so the advantage of a lead keel is often overstated. As the surface of a fin type keel is just a fraction of the total wet surface, the difference between an iron keel and a lead keel can in reality be ignored for cruising yachts.
Dehler 34 Mk II can enter most marinas as the draft is just about 1.70 - 1.80 meter (5.58 - 5.88 ft) dependent on the load. See immersion rate below.
The boat may be equipped with an inboard Yanmar 2G 20 diesel engine at 18 hp (13 kW). The speed is 6.5 knots.
The transmission is a shaft drive. A shaft drive will in the long run require less maintenance than other types of drive e.g. a sail drive.
The fuel tank, which is made of stainless steel, has a capacity of 60.0 liters (15 US gallons, 13 imperial gallons).
Sailing characteristics
This section covers widely used rules of thumb to describe the sailing characteristics. Please note that even though the calculations are correct, the interpretation of the results might not be valid for extreme boats.
What is Capsize Screening Formula (CSF)?
The capsize screening value for Dehler 34 Mk II is 2.11, indicating that this boat would not be accepted to participate in ocean races.
What is Theoretical Maximum Hull Speed?
The theoretical maximal speed of a displacement boat of this length is 7.1 knots. The term "Theoretical Maximum Hull Speed" is widely used even though a boat can sail faster. The term shall be interpreted as above the theoretical speed a great additional power is necessary for a small gain in speed.
The immersion rate is defined as the weight required to sink the boat a certain level.
The immersion rate for Dehler 34 Mk II is about 195 kg/cm, alternatively 1097 lbs/inch.
Meaning: if you load 195 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 1097 lbs cargo on the boat it will sink 1 inch.
Sailing statistics
This section is statistical comparison with similar boats of the same category. The basis of the following statistical computations is our unique database with more than 26,000 different boat types and 350,000 data points.
What is Motion Comfort Ratio (MCR)?
The Motion Comfort Ratio for Dehler 34 Mk II is 19.4.
What is L/B (Length Beam Ratio)?
The l/b ratio for Dehler 34 Mk II is 3.12.
The ballast ratio for Dehler 34 Mk II is 44%.
What is Displacement Length Ratio?
The DL-ratio for Dehler 34 Mk II is 188 which categorizes this boat among 'light racers'.
Maintenance
When buying anti-fouling bottom paint, it's nice to know how much to buy.
The surface of the wet bottom is about 33m2 (355 ft2).
Based on this, your favourite maritime shop can tell you the quantity you need.
Note: If you use a paint roller you will need more paint than if you use a paintbrush.
If you need to renew parts of your running rig and is not quite sure of the dimensions, you may find the estimates computed below useful.
| Fractional rig | ||||
| Usage | Length | Diameter | ||
| Jib sheet | 10.6 m | (34.8 feet) | 14 mm | (0.55 inch) |
| Genoa sheet | 10.6 m | (34.8 feet) | 14 mm | (0.55 inch) |
| Mainsheet | 26.5 m | (86.9 feet) | 14 mm | (0.55 inch) |
| Spinnaker sheet | 23.3 m | (76.5 feet) | 14 mm | (0.55 inch) |
| Fractional rig | ||||
| Usage | Length | Diameter | ||
| Mainsail halyard | 32.6 m | (107.0 feet) | 12 mm | (1/2 inch) |
| Jib/genoa halyard | 32.6 m | (107.0 feet) | 12 mm | (1/2 inch) |
| Spinnaker halyard | 32.6 m | (107.0 feet) | 12 mm | (1/2 inch) |
| Jib sheet | 10.6 m | (34.8 feet) | 14 mm | (0.55 inch) |
| Genoa sheet | 10.6 m | (34.8 feet) | 14 mm | (0.55 inch) |
| Mainsheet | 26.5 m | (86.9 feet) | 14 mm | (0.55 inch) |
| Spinnaker sheet | 23.3 m | (76.5 feet) | 14 mm | (0.55 inch) |
| Cunningham | 4.5 m | (14.8 feet) | 12 mm | (1/2 inch) |
| Kickingstrap | 9.0 m | (29.5 feet) | 12 mm | (1/2 inch) |
| Clew-outhaul | 9.0 m | (29.5 feet) | 12 mm | (1/2 inch) |
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