I have been requested to put a question to you that has been openly
discussed on the Footy Forum. Angus suggested including Bill & Himself.
Angus' email is private and cannot be located so I can only do what I have
My primary question surrounds the Length
(Depth) that the Rudder my extend on the Vertical Axes for the
By reading the Rules there doesn't seem to be an exact determination of
what the Overall Restrictive Length of the Rudder might be. There is however
the assumed 200mm slot but no formal rule to provide for this
FOOTY CLASS RULES for radio sailing
These are open class
which anything not specifically restricted or prohibited is
B. PRIMARY MEASUREMENT RULE
B.1 With the exceptions listed below in B.2, B.3 and B.4,
the boat in racing trim shall be
capable of fitting into an open-topped rectangular
measurement box of internal dimensions
305mm long, 305mm deep, 153mm wide, with 6.3mm wide slots
for projecting spars and
rudder, as shown in the diagram.
B.2 The following may project above the top of the measurement
box: sail(s), mast,
rigging, aerial, associated fittings.
B.3 A bowsprit may
project forward of the measurement box.
B.4 The following may project aft of the measurement box:
E. HULL APPENDAGES
E.1 The overhang of the rudder is restricted to 51mm aft of the
E.2 Except for the rudder, the
following are prohibited: retractable and or movable hull
E.3 Rudder thickness shall not exceed 6.3mm.
E.4 Materials shall not be of density higher than lead;
Also in addition to this there is somewhat of a confusion on my part re
the Construction of the Box. I've seen many tact's with some made from simple
Ply to others made from 20mm MDF Board. Each have varying restrictive degrees
on how a boat can be placed. The more robust teh construction of the Box in
effect brings into play the 200mm guide slot to allow rudders which attach or
are positioned under teh hull.
In progressing a Rule Interpretation I have provided for an attachment
which hopefully explains what I am contemplating, albeit with a straight
rudder and not one as described in my suggested alternative.
- Assumed the Boat is placed in the Box along the Vertical axes and
is not slotted in from a variety of Axes merely to overcome a
restriction or conversely to deny a competitors right to address the rules
as they stand.
- A rudder Attaching Post extends from the boat through the "V" to no more
than 51mm aft of the interior of the box.
- with a box construction of 1mm ply this could mean a maximum rudder
width of 50mm.
- A Vertical hole for Inserting Rudder is drilled through post.
- The Rudder is attached through hole on rudder post by Tiller Arm
- The Rudder of varying length up to 250mm (possibly out to 305mm without
ballast restriction), yet not more than 6.3mm in thickness, can be
attached via rudder post with no part of the rudder entering the slot in
- Can the Push rod be bent (say 90 deg) to accommodate a longer Tiller
Arm? This might extend beyond the "V" but still fits within the box if
placed from the vertical axes.
- Construction Material could be Carbon Fibre, Glass, Ply, Aluminium or
any other material lighter than current ballast.
Additionally can there be an Alternative consisting of;
- varying shapes of rudders that could have a portion under the boat
- extending downward and exiting the slot at less than 200mm
- with a Vertical Thinner trailing section extending further downwards.
- At no time extending along the Longitudinal axes greater than 51mm aft
of the internal of the Box
- Greater Steerage Control in Gusts.
- Marginal Performance Increases to Windward
- Negligible but minor Benefits Running
- Improved Tacking in higher winds
- possible reduction in Ballast weight giving greater steerage control and
increased all round performance due to weight displacement.
- Less Weight - Less Force Require to move static object.
- Greater Sideways Resistance against force of wind enabling a reduction
in notional ballast
- Greater Drag
- Greater Weight depending on construction.
- Perception of unfairness and outside spirit of Box Rule 200mm Slot
- High grade Servos Req'd
- possible reduction in ballast weight and perception of using rudder as
The only limitation on what I am proposing is where it states at Rule
B:1, where it states, "the boat in
racing trim shall becapable of fitting into....as shown in the diagram
This could be interpreted that some portion of the Rudder must
fit within the confines of the Box. From here however my Alternative
rudder configurations would seem to be applicable.
Can you investigate whether my Rudder Length is a problem within
the rules and whether there should be a formal Interpretation Issued to
clear-up any misgivings about what size rudder/ Length of Rudder can be
As an aside there has been some mention of foil rudders which if attached
in my estimation would exceed the greater thickness of 6.3mm for the rudder.
Are Foils on Footy's permissible by way of attachment to the rudder and
thereby not allowing passage through the slot.
My suggestion of longer than the box was merely to get the members of
the Forum thinking of the possibilities where some unscrupulous sailors might
try to exploit the rules to their benefit. To some degree this was
successful, if somewhat naive on my part given the aversion to addressing
rules and regulations within a developing Class .
Many Thanks & sorry for raising such an issue but the debate has
grown beyond a simple request for feedback