| Backman21 Data: |
| Loa 6.60 meters |
Bmax. 2.40 meters |
| Draft 0.40-1.45 meters |
Displ. 500 kg |
| SA 27 sq.meters |
Asymmetric 42 sq.meters |
| Canting Keel +/- 43 degrees |
Bulb weight 200 kg |
| Twin rudders |
Daggerboard |
For more information contact:
Lough Ree Powerboat School
Lo call: 1890 70 40 90
Email:backman@powerboat.ie
Backman21 – overall design idea:
The basic idea for the Backman21 was to design a fast and exciting sportsboat that planes early and is capable of top speeds +20 knots. Backman21 is:
- fun
- fast
- easy to sail
- has clean cockpit
- well balanced
- stable on the plane
- smooth and precise sail
- superb quality at low cost
European Yacht of the Year 2005:
Backman21 was awarded the Silver Medal in the "European Yacht of the Year 2005" Awards.
The boat was 1 of 5 finalists in the category yachts up to 10 meters.
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Canting keel + daggerboard:
The major advantage with a canting keel is that it is possible to reduce the overall displacement while keeping the righting moment.
| Low displacement is a major factor when you are getting up on the plane. It also equalises different crew weights when racing in one design, e.g. a lighter crew can still power up the boat fully in wind forces up to 4-5. In really strong winds the heavier crew will of course have an advantage as the lighter crew always will have benefits in lighter winds. The extra feature of a canting keel engages all members of the crew both up and down wind. |
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Trim responsibilities:
Helm – main
Middle man – keel
Bowman – jib/asymmetric
Pros
- Reduced displacement for a given righting moment
- Low displacement = planes earlier
- Every crew member involved in trimming
- Crew weight equaliser
Cons
- Increased wetted area
- Complex construction
Twin rudders:
A twin rudder configuration has its biggest advantages on boats with wide sterns. When the boat is heeling a centre mounted rudder will be lifted up of the water which makes a need for a very deep rudder.
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A deep rudder creates much higher forces than a shorter one which makes it very heavy. With twin rudders you eliminated this problems. As the rudders are mounted off the centre line and angled outwards at approx. 15 degrees the leeward rudder becomes more effective. At 15 degrees healing the rudder is vertical in the water and the windward rudder is lifted out of the water. This gives you increased control in critical situations, it's much less risk to lose rudder grip with a broach as a result.
Pros
- Increased control
- Smaller and lighter rudders
- Less stress on rudders and fittings
- Leeward rudder works in undisturbed conditions.
e.g. no turbulence from canting keel and daggerboard
Cons
- More complex construction
Construction:
Backman21 is built of bidirectional glass and epoxy with a foam core by Ovington Boats, U.K.
Both hull and deck are vacuum bagged and oven cured.
The boat is stiffened up with a inner liner / bulkheads.
This construction gives a superior life span for the boat even a 6-7 year old boat is as competitive as a new one.
Compared with a polyester construction, a hull lasts for 1-2 years (in competitive terms).
Pros
- lighter boat
- stronger boat
- longer lifetime
- no water absorption
Cons
- more expensive than polyester/vinylester
The Rig:
Backman21 has a carbon mast and bowsprit, boom and spreaders are aluminium.
The carbon mast was selected because of the lower weight and it is more responsive to trim.
A gnav system is used to create maximum space in the cockpit.
No back stay or runners.
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Pros
- very flexible rig
- low overall weight
- lower the boats centre of gravity
Cons
- more expensive than aluminium
Racing:
Backman21 is designed to be raced as a one design or in the sportsboats class (UK) with a crew of 3-4 (total crew weight 220-270 kg)
As far as we are aware of Backman21 is the only boat with canting keel in the SBR class.
New rating received in October – 0.956.
We are optimistic that the penalty for canting keels and very low displacement will be reduced.
At the moment Backman21 gives the Melges24 (0.938) 1 minute and 8 seconds per hour, corrected time. The Melges24 is 1.6 meter longer...
Trailer sailer:
Tow behind your family car
Set up rig and launch boat within 1-2 hours
Retractable keel
Launch on a slip way
Customised trailer
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Safety:
Unsinkable, three different floatation boxes, incl. crash box in bow.
Self righting even with the keel fully canted in leeward Aluminium (very good shock absorber) daggerboard protecting the keel
Miscellaneous:
Lockable storage box in cockpit (big enough for 2 - 3 Hp engine)
Trampoline berths
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Sales & Production:
Production has started at the renowned Ovington Marine.
Approx 4-6 weeks delivery time from order.
30% deposit at order and all funds cleared at delivery.
For more information contact:
Lough Ree Powerboat School
Lo call: 1890 70 40 90
Email: phil@powerboat.org
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