Graham Radford Yacht Design
RADFORD 350 - DESIGN # 11
STEEL CRUISING YACHT
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The Radford 350 is the smallest of the R1000 Series steel cruising
yachts. The easily driven hull has a moderate beam, long waterline and veed
hull sections. The long waterline and veed sections, combined with the shallow
keel and rudder & skeg, give very good directional stability and easy
handling under sail.
|
L.O.A. |
10.67m |
35'0" |
|
L.W.L. |
10.00m |
32'10" |
|
Beam |
3.32m |
10'10" |
|
Draft |
1.50m |
4'11" |
|
Dspl |
7,620kg |
7.5T |
|
SAIL AREA |
|
|
|
|
28.5sq m |
307sq ft |
|
|
39.0sq m |
420sq ft |
|
Yankee |
25.3sq m |
272.3sq ft |
|
Staysail |
9.66sq m |
104sq ft |
Kit Assembly
The Radford 350 has a simple aft cockpit layout, shallow draft keel and
an easy to build multi-chine hull which is available as a complete plasma cut steel kit . All of the hull and deck components,
including the hull plate, are cut for easy assembly.
Accommodation
The accommodation is simple and open. An aft cabin to port has a double
berth, hanging locker & stowage lockers including one between the engine
and the cockpit sole. The galley includes double sinks, 2 burner stove with
oven and the required galley lockers. Opposite is the head & shower with access
to an aft stowage area. Headroom in the aft cabin and head is 1.83m
(6'0"). Elsewhere the headroom is 1.88 - 1.9m (6'2"-3"). The
large chart table incorporates an ice box, lockers and instruments. Settees are
2m long with good seat width and angled backrests for comfortable seating. With
the backrests removed, the settees double as very good sea berths. Outboard and
forward of the settees are more lockers. The forward vee berth can be screened
from the saloon if required. Good stowage is available under this berth.
Use the navigation aids at the top of the page to view
the accommodation layout for the R350.
Deck Layout
Starting aft there is a boarding platform, then on deck two hatches
provide access to the lazarette and steering gear. An optional FRP / foam
sandwich watertight bulkhead is located between the lazarette and the
accommodation. The cockpit sole runs through to the transom with the gas
bottles stowed under the aft deck. The cockpit is 1.95m (6'4") long and
the seats are 400mm wide. The distance from the cockpit seat back to the
opposite seat front gives an ideal sitting position when the yacht is heeled.
Either wheel or tiller steering can be used.
The companionway doors are set forward into the house and the sliding
hatch overhangs these doors to give added weather protection. A combination
solid and soft dodger can be used for cockpit weather protection. Reefing and
other control lines lead aft to the cockpit for easy mainsail handling.
Ventilation to the cabin is supplied by deck hatches and dorade vents. Opening
ports in the house sides and cockpit seat fronts would further improve
ventilation.
Forward of the steel collision bulkhead is a self draining anchor locker
where an anchor winch can be fitted if required. For easier access to a wharf
or marina, the pulpit incorporates a step, and does not protrude beyond the bow
fitting.
Sail Plan
The double spreader rig can be used as either a sloop or cutter. With a
fully battened mainsail, reefing headsail and staysail / storm jib this rig is
suitable for short handed sailing.
Use the navigation aids at the top of the page to view
the sail plan for the R350.
Loading
The following information shows the range of loading and changes in waterlines.
|
Waterline |
Displacement |
Loading |
||
|
25mm (1") Up |
7,280kg |
16,050lb |
0 |
0 |
|
@ D.W.L. |
7,753kg |
17,092lb |
473kg |
1,043lb |
|
25mm (1") Down |
8,236kg |
18,157lb |
956kg |
2,108lb |
|
50mm (2") Down |
8,730kg |
19,246lb |
1,450kg |
3,197lb |
|
Expected Maximum |
|
|
|
|
|
75mm (3")
Down |
9,236kg |
20,362lb |
1,956kg |
4,312lb |
|
100mm (4") Down |
9,750kg |
21,495lb |
2,470kg |
5,445lb |
An effort should be made to build and load the yacht within the figures recommended. Overbuilding or adding any unnecessary weight during construction and fitout will detract from optimum loadings. See stability curves highlighting possible variations in righting moments based on different vertical centres of gravity.
Scantlings
The hull structure is based on a forward collision bulkhead, widely
spaced transverse frames plus intermediate floors and longitudinals inway of
the keel and mast step. The frames and floors are notched to accept the 27mm
diameter chine tubes, the 40 x 5mm and 40 x 3mm flat bar stringers and the
longitudinals.
The deck edge construction includes a 42mm S.S. tube which acts as a
rubbing strake. Stanchion bases, toerails etc are welded to this tube. The stem
is also a S.S. tube giving a strong, "clean" structure.
The frames, floors and keel floors, longitudinals, keel plating, rudder
skeg and hull plating in the slamming areas are cut from 4mm plate. The balance
of the hull plate, deck, house and cockpit are cut from 3mm plate. The total
steel weight in the kit, including M.S. flat bar stringers, capping, chine
tubes, deck edge tube and building jig is 4,500kg (9.900lb).
Tankage
Three water tanks give a total of 350 ltr (77gal) - two under the settees
at 130 ltr each and another 90 ltr tank under the cabin sole. Two fuel tanks
give a total of 179 ltr (39gal) - one under the double berth and the other
forward of the engine under the cabin sole. An 86 ltr sump tank is provide,
with space for more if required. The limit of ballast is below the keel / hull
plate intersection and drains to form a bilge just aft of the mast. Spare
anchor and chain can be stowed under the cabin sole forward of the mast.
Engines
The maximum hull speed of the R350, at Speed / Length Ratio (S/L) = 1.34,
is 7.68 knots. An efficient cruising speed is at S/L = 1.1, or 6.30 knots. The
list shows the required shaft horsepower (SHP) for different speeds at 8620kg
(19,000lb) displacement. Note the rapid increase in required SHP (hence fuel
consumption) for small gains in speed.
Based on a speed requirement, select an engine which - running at an
optimum RPM - will give the required SHP for that speed.
|
S/L Ratio |
Speed - knots |
SHP |
|
1.00 |
5.73 |
15.66 |
|
1.10 |
6.30 |
20.85 |
|
1.20 |
6.88 |
27.07 |
|
1.3 |
7.45 |
34.41 |
|
1.34 (maximum) |
7.68 |
37.69 |
In Conclusion
The R350 is a strong steel yacht with good sailing performance which
would suit couples who want to do long distance cruising on a budget.
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] [ Photos ] [ Stability
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