BB Hardware on my .21 Outrigger

Here are some pics of how some personalized BB Hardware super-light .21 strut and rudder could look like on the transom of a outrigger.

SS 4-40 screws are used for mounting of the rudder and strut bracket and aluminum 4-40 lock nuts. The top screw that holds the rudder blade is a 6-32 SS button head and the lower brake away screw is a 4-40 aluminum (hole drilled through - no threads in rudder blade bracket).

I used a 90 deg M4 brass nipple bought from Frank Werner that I glued with ProSeal™ Pro Weld Quick glue. But you can use JB's version of that glue also. The nipple is glued at 90-deg left when the rudder is moved to full lock right... So at neutral the nipple points slightly forward.

The radius on the inside of the rudder bracket slightly interferes with the two outside mounting holes so I filed that part flat so the screw head would sit flat.


Steering linkage: Du-Bro #369 ballinks, Du-Bro #144 pushrod & Du-Bro #336 threaded coupler.

Aluminium #4 washers is used on the inside of the transom. Futaba S9551 steering servo.

Du-Bro medium silicone tube...

If you run your .21 rigger "old-school" style with a exposed driveline (and usually with rear sponsons) then you may want to modify your strut like this. I used a Dremel sanding drum (the smallest dia) and sanded it down towards the 1/4" K&S brass tube.

Note; the rudder blade is really, really thin and sharp - borderline too sharp/thin if you ask me. That is all good if you want to go fast but it makes the leading edge of the blade fragile. So I recommend you buy and extra blade right away and remove the blade from the bracket after each days boating. Store (and haul) the boat with it removed and it will last longer.

All screws are bought from Fastener Express.

Introducing: BB Hardware

Introducing BB Hardware!

Now introducing - BB Hardware!

Outrigger hardware made in Sweden by Bengt Björkhage!

New .21-size Short Flywheel for "SG" shafts

• Diameter: 32 mm
• Weight:
• Comes complete with brass cone 
• Our preferred flex collet is the Octura #OCFH1414 (not included)
• ("SG" shaft means that the engine has a "car" crank with 5mm un-threaded outer part that is cut off. The 5 mm part is where the clutch would be if installed in a RC car.)
• Price: T.B.A.

Super Light Weight .21-size Outrigger Rudder

• Material: 7075-T6 aluminum in rudder blade, pivot mount & rudder bracket.
• Total weight as in the pictures: 29 g (1.02oz).
• 3 mm pivot shaft with dual metal bushings.
• Rudder blade length: 88 mm (below the bracket).
• Rudder blade width/cord: 17.8 mm (.7") , 20.3 mm (.8") or 22.8 mm (.9").
• Rudder blade trailing edge thickness: 2.9 mm (.11") @ 20.3 mm width.
• Mounting holes through transom: 3 mm (use M3 or 4-40 screws).
• Rudder blade mounting threads: 6-32 (top) & 4-40 (bottom).
• Spares will also be available.
• Drawings will be published at a later date...
• Price: 595:- SEK (including 25% VAT)

Super Light Weight .21-size Outrigger Strut

• The strut design is based on the trusted CMD style - but lighter!
• Material: 7075-T6 aluminum in strut and 6061 in the T-bracket.
• Total weight as in pictures: 19 g (0.67oz).
• 1/4" hole in strut for either 1/4x3/16" bushings or K&S 1/4" brass tubing (the hole is a little tight so you need to clear it a little).
• Round bottomed strut.
• The strut/T-bracket mounting accepts a M4 or 8-32 screw.
• The T-bracket mounts with M3 or 4-40 screws to the transom (3 mm holes).
• Drawings will be published at a later date...
• Price: 250:- SEK (including 25% VAT)

Light Weight .21-size Engine Mount Rails

• Updated! The engine-rails are now completely symmetrical as the left and right hand side is exactly the same. That means they are now slightly lighter in weight also! The picture still shows the earlier version.
• They're based on CMD/Eagle hole spacing and overall design = drop-in design for any Eagle 21 or Kep's 21 rigger.
• Material: 7075-T6 aluminum.
• Weight (pair): 16 g (0.56oz)
• Mounting hole C-C spacing: 51 mm (2").
• Mounting hole threads: 1/4"-20 UNC = use normal nylon 1/4-20 wing bolts.
• Engine mounting hole spacing: 21 mm - most .21 sized engines like CMB, Mac, NR & TP will fit.
• Engine mount holes: 2.5 mm - not threaded - use either a 4-40 thread forming tap or a M3 tap.
• It will also be available complete with rubber grommets for either 1/8, 3/16" or 1/4" tub sides and nylon screws.
• Price: 250:- SEK (including 25% VAT)