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  • Dreher Aerodynamic Sculls

    Overview Specs Price List

    Introduction: Dreher is adding to its blade shape offering for Aerodynamic Sculls with Aero EA and EAX The blade is cross between are Apex shape and the Original Aero Shape and was shown at the 2013 HOCR. The blade shape will be appreciated by people that learned how to scull with the hatchet blade shape. Anyone that likes the Apex or the original Aero Shape will like this blade. We begun taking orders in October 2013 and will begin shipping by the first of the year 2014. Production tooling for the new blade is underway.

    Dreher introduced its next generation Aerodynamic sculls at the beginning of 2012! The Aero EH and Aero EHX replaced our previous models of Aero and Aero2. The change was done to offer a more affordable aerodynamic oar to manufacture as well as to ship.

    We have two versions (i.e., standard modulus and high modulus carbon) with the same elliptical designed shaft to provide the aerodynamic effect on the recovery, but with two different price points driven by the materials of construction. By the beginning of 2014, this family of aerodynamic sculls will have two blade shapes from which to select. Be the first in club to get the new sculls!

    The Design and Manufacturing Method: The EH design draws on 23 years of oar/scull design and carbon prepreg manufacturing experience. The major departure from previous designs is an elliptical aerodynamic shaft and hydrodynamic blade system that is more efficient by optimizing the oar shaft and blade shape as they move through the water and the air.

    The elliptical shaft profile blends exactly into the matching blade profile and also assures that the blade pitch will always remain the same. The high-pressure compression molding process results in the same high quality parts that Dreher Carbon Parts are known for. We are able also to produce the elliptical shaft in our roll wrapped construction with a specially designed mandrel. All of our shafts are made on mandrels that allow tape wrapping and most importantly autoclaving. The autoclaving results in superior carbon fiber compaction and resin transfer both of which result in increased longevity of the shafts.

    Materials Of Construction Method: The EH sculls make use of the same material of construction as standard adjustable length sculls, while the EHX uses the same materials as our high modulus sculls.

    Hydrodynamic Advantages: Hydrodynamic theory and racing blade performance models shows a high component of lift propelling force at the catch position. This recommends a high aspect ratio blade shape. When the shaft is 90° to the axis of the boat a bigger area would theoretically be best to maximize the drag type propelling forces that predominate. The last 30° of the drive again trend toward a high aspect ratio shape as lift forces re-establish themselves toward the finish.

    This blade shape has a the shape starting narrow closest to the blade/shaft interface and ends up the widest near the tip of the blade. The shape of the blade makes it easy to row with even in rough water. The blade is quiet with little splash at the catch do to a small profile and seamless transition from blade-to-shaft and is quite clean on the extraction.

    Aerodynamic Advantages: A true aerodynamic profile seamlessly mated to a hydrodynamic blade profile provides for the ultimate in wind resistance on the recovery when the boat speed and the oar’s angular velocity are both at their maximum.

    The elliptical aerodynamic profile is used on the shaft and blade where it will do the most good, toward the end where the angular velocity is the greatest. The aerodynamic profile offers the least resistance at the time when the boat is traveling at it’s fastest – on the recovery, when the oars are out of the water.

    Performance: Less wind resistance on the recovery and improved stability equates to the potential for greater speed for the same effort. The more efficient the sculler and the faster the boat class, the greater the potential for speed improvement.

    A side benefit of the aerodynamic shape is a thinner, but slightly wider shaft where the blade attaches to the shaft, resulting in much more resistance to twist than a circular shaft.

    The Integrated Modular Design: As with the entire family of Dreher Sculls and Oars the Dreher Aerodynamic Sculls, these oars have a true integrated modular design where:

    • The blades are installed using low temperature hotmelt requiring no pitching and is removable.
    • Based upon the lock and key principle, the elliptical blade receptacle mates to the shaft’s elliptical appendage to fit exactly into the blade. As with all our oars, this transition from shaft to blade is very smooth, and does not generate extra drag at finsih. Some of our competitors have a large step joint at the blade shaft interface that creates excessive drag at the the finish of every stroke.
    • The pitch of the oar will remain constant until the sleeve wears out and then it can be easily changed with only a screwdriver.
    Testing: Comparative testing has been conducted using a Force Measurement system at various distances at varying stroke rating over the past two years. Also, subjective testing was done in variable wind and water conditions by different levels of scullers and our feedback to date has been very favorable. Most of our best feedback has come from our customers. They like to do their own testing and when they convince themselves it is a better deisgn, we are rewarded with additional orders. However, just as with any of our oars and sculls, the equipment will reward those with the greatest skill.

    Conclusions: These EH or EHX sculls seem to make people with good blade-work row faster and this design is worthy of your serious consideration.

    Length Adjustment:+/- 5 cm of continuous adjustment standard.
    Blade Shape:H for Hydrodynamic in both standard construction and twill for the high modulus sculls.
    Blade Area:775 sq. cm.
    Blade Weight: Light, Medium and Heavy for E-HX and Medium for E-H.
    Rig:Choice of Ave. Length at 286 cm or below +/- 5 CM with your choice of average inboard.
    Collars & Sleeves:SRS Red Sleeves with Black Collars or Black SRS Sleeves with Red Collars.
    Handle sizes:Small (3.3 to 3.4 cm diameter), Medium (3.5 to 3.6 cm in diameter) or Large (3.7 to 3.8 cm in diameter) with grips installed.
    Grip type:Choice of Stämpfli (orange), STS (black), Martinoli (black, red or light orange) or Row-Wik Grip Wrap (Red, Blue, Black or Yellow).
    Weight:Approximately 1275-1300 grams with collar and grip, including the sleeve.
    Shaft Stiffness:Less Stiff (~5 cm deflection, Standard (~4 cm deflection) or stiff (~3 cm deflection).
    Construction:E-HX: High Modulus carbon prepreg, carbon twill, and syntactic foam core for the blade vs. E-H: Standard modulus carbon prepreg tape and same foam core as the E-HX.
    Blade Surface preparation:Class "A" black high gloss finish as standard; Options for additional cost - Buffing; priming or priming and painting one base color with a clear-coat.

    Click on the icon to add an item to your shopping cart.
    Item Description Price
    01A00 HIGH MODULUS CARBON SCULLS: BBX, APEX-X, RX AND REX $748.00
    01A00B EHX (ELLIPTICAL HYDRODYNAMIC 2012 SCULLS) - HIGH MODULUS $778.00
    01A01 CARBON SCULLS - ADJ. 286/88 +/- 5 CM $542.00
    01A01B EH (ELLIPTICAL HYDRODYNAMIC 2012) SCULLS $572.00
    01A02 CARBON SCULLS - FIXED $428.00
    01A06 CARBON TANK SCULLS (For Dreher Tanks Only) set $570.00
    01M21 SCULL HANDLE - SMALL, MEDIUM OR LARGE $50.00
    01M25 SCULL HANDLE - FIXED $43.00
    01M27 HANDLE ENDS (RECREATIONAL) $4.00
    01M41 SCULL HANDLE CLAMP $9.00
    01P51 HANDLE DECAL $1.50
    01P52 SLEEVE DECAL $2.00
    01P55 NEW DREHER DECAL - REFLECTIVE $1.75
    01P62 SCULL SLEEVE - MARTINOLI (Fixed Length) PER PAIR $25.00
    01P64 SCULL COLLAR - MARTINOLI (RED AND GREEN) PER PAIR $16.50
    01P66 SCULL SLEEVE SRS (BLACK OR RED) PER PAIR $28.00
    01P67 SRS SCULL COLLARS (BLACK OR RED) PER PAIR $17.50
    01P70 ROW-WIK SCULL GRIP WRAP (PER PAIR) $14.00
    01P71 SCULL GRIP: ORANGE STAEMPFLI (PER PAIR) $23.00
    01P73 SCULL GRIP: MARTINOLI (PER PAIR) $17.00
    01P73S 4 PR OF MARTINOLI GRIPS: $57.80
    01X91 SURFACE PREP & PRIME SCULLS $75.00
    01X92 PRIME, PAINT & CLEAR COAT SCULLS 1 PR $88.00
    01X95 SURFACE PREP PRIOR TO PAINTING: 1 PR SCULL BLADES $20.00
    02P69B OVERGRIP STD. (1.5 INCHES WIDE BY 5 YDS. LONG) $2.50
    02P69BS OVERGRIP STD (1.5 INCHES WIDE BY 5 YDS. LONG) 5 ROLL SPECIAL $10.00
    08A07 PADDED SCULL BAG - BLUE; WITH FULL LENGTH ZIPPER, WITH HANDLE $109.00
    08A12 SCULL OAR BAG - NYLON UNPADDED, FULL LENGTH, RED/BLUE $75.00
    08P974 WRENCH 8 MM $2.75
    Prices current as of March 22, 2014

    Product Highlights
    Product Highlight
    (click on the thumbnails below for a closer look)
    Dreher EHX THE Next Generation of Aerodynamic Sculls (side and front)
    2014 Dreher Aero EA: Three Views
    Dreher EHX Showing Back, Front and Side Views
    Dreher EHX In Action Just Before the Catch
    Dreher EHX In Action At the Start of the Catch

    Other Sculls Options
  • Dreher High Modulus Custom Sculls
  • Dreher Adjustable Length Competition Sculls
  • Club, Rec & Youth Sculls

  • Related Links:
    Dreher Sculls
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    Dreher Sweeps
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    Technical Papers
    Discussions of blade shapes and theory.
    Maintenance
    A revised section on how best to repair, adjust and maintain Dreher Oars.
    Dreher - Durham Boat Company, Inc.
    220 Newmarket Rd. (Route 108)
    Durham, NH 03824, USA
    603-659-7575 - 603-659-6565
    Email: Cfuerst@durhamboat.com
    Made in USA