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IMPALA 28 (THOMAS)
Impala 28 photo on sailboatdata.com
Impala 28 (Thomas) drawing on sailboatdata.com

Hull Type:  Fin w/transom hung rudder Rig Type:  Fractional Sloop
LOA:  28.00' / 8.53m LWL:  23.17' / 7.06m
Beam:  9.25' / 2.82m Listed SA:  335 ft2 / 31.12 m2
Draft (max.)  5.50' / 1.68m Draft (min.)  
Displacement:  4300 lbs./ 1950 kgs. Ballast:  
Sail Area/Disp.1:  20.33 Bal./Disp.:   Disp./Len.:  154.33
Designer:  David Thomas
Builder:  Hunter Marine Ltd. (UK)
Construction:  FG Bal. type:  
First Built:  1977 Last Built:  1984 # Built:  155
AUXILIARY POWER (orig. equip.)
Make:  Yanmar Model:  1GM
Type:  Diesel HP:  9
RIG AND SAIL PARTICULARS  KEY
I(IG):  31.00' / 9.45m J:  9.25' / 2.82m
P:  33.45' / 10.20m E:  11.45' / 3.49m
PY:   EY:  
ISP:   SPL/TPS:  
SA(Fore.):  143.38 ft2 / 13.32 m2 SA(Main):  191.50 ft2 / 17.79 m2
Sail Area (100% fore+main triangles):   334.88 ft2 / 31.11 m2
Sail Area/Disp.2:  20.32 Est. Forestay Length.:  32.35' / 9.86m
BUILDERS (past & present)
More about & boats built by:   Hunter Boats Ltd.
DESIGNER
More about & boats designed by:   David Thomas
RELATED LINKS
  Impala 28 Class Association  www.impala28.co.uk
  Hunter Association (UK)  www.hunterassociation.org.uk
NOTES
Partial history from Class website:
The initial design for the IMPALA evolved as a direct result of the formation, in 1977, of the Offshore One Design Council which was set up by a group of leading yachtsmen to encourage One Design racing. There were thirty designs submitted, including the IMPALA, of which three were given the support of the council. The IMPALA remains as the strongest supported class of those craft selected and the only one still in it''s original form. The class pioneered standard ratings within the I.O.R. which has been copied by other classes. The first National Championshipwas held in Cowes in 1979 and was won by David Thomas, the designer. The event has been held every year since. The class rules have changed surprisingly little since the class was formed. The first main change was brought about by the change in the I.O.R. resulting in a rating increase. David Thomas, designed a lead shoe for the keel and some internal ballast which had the desired effect on the rating. Most other changes were to make the rules more rational without altering the meaning too much. One change to follow progress was the allowance of Mylar No 1 genoas. 1988 saw the introduction of the inboard diesel. This has helped bring the class up to date. The engine adopted was the YANMAR 1GM (9 hp), (see rules). In 1989 the blade no 3was adopted along with some other minor changes. The following year saw a full width main sheet traveller, and 250 lbs of lead added to the outboard to standardize both inboard and outboard C.H.S. ratings. 1993 saw the new mast from Kemps, and for 1994 a new full hoist No 2 is allowed,also the Luff Perpendicular rule has been rewritten.
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