27:02COMPRESSEDNATURALGAS:CNGstovesystemshavetheadvantageofnothavingthe
potentialhazardofliquidleaksorspillageintothebilge.Readcarefullythe
instructionsincludedinthemanufacturer'sbinder.CNGtanksarefittedwithpressure
gaugesandsafetyvalves.Thepressuregaugeservesinpartasafuelvalveandthe
safetyvalvereleasesoverboardatthesternintheeventofexcesspressure.
27:03GIMBAL
:Countertopstoveshaveoptionalgimbalattachmentsavailablethathave
counterweightsunderneathwhichareadjustabletosuitdifferentconditions.Ovenmodels
canbelockedstationarywhennotinuse.Stovesaredesignedtogimbalinordertoallow
cookingwhenheeledoverorrockingatamooring.
Stovescangimbaltocompensateupto25degreeanglesofheel,yetdiscretionshouldbe
usedtodeterminesafecookingconditions.
27:04RATELCOSTOVES
:Optionalcabinheatersareavailablewhichburnsolidfuel.
Theyhavebeeninstalledwithregardstoproperclearancesandshouldbeusedwiththe
samecareaswoodstoves.(Refertomanufacturer'sliteratureandI24)
28:00KEELBALLAST
Leadhastraditionallybeenthepreferredmaterialforuseasballast.While
comparativelythemostexpensive,itssuperiorityjustifiestheexpense.
Unlikemostmetals,leadisimmunetothecorrosiveactionofsaltwater.It'snon
magneticcharactermeansnointerferencewithcompassesandotherelectronics.Initself,
itprovidesanidealsourceofgroundingforthebondingandlightningprotectionsystem
andleadiseasilymoldedtoprovideahighweighttovolumeratioinadesirableshape.
28:01CONSTRUCTION
:Thekeelisaleadcastingofhydrofoilshapetoprovideleast
resistanceandmaximumlift.Stainlesssteelboltsaremoldedintothelead.The
threadsprotrudeabout2"andarewrappedinaflexiblesealant.Thekeelisattachedto
thehullbydrillingholesthroughthethickfiberglasskeelsontolineupwiththekeel
bolts,andthenloweringtheboatontothekeel.Thekeelboltnutsarelocatedinthe
maincabinbilgecompartments;alsointheshowersumpareaoftheSabre34.
Fiberglassputtyisusedbetweenthekeelandhulltofillallvoidsandirregularities.
However,thisisnotintendedasanadhesivetobondthekeeltothehull,andisused
solelyasafiller.Inaddition,polyesterputtyisusedtofairtheexteriorofthe
jointbetweenthekeelandthehullbeforethebottompaintisapplied.(RefertoI12)
28:02CRACKBETWEENKEELANDJOINT
:Itisverynormalforacracktodevelopbetween
theleadandthefiberglassatthejointofthekeeltothehull.Thisisduetothe
differencesinthermalexpansionratesofthedifferentmaterials,andthedifferencesin
thestressesthatoccuratthisjointwiththeboatinthewater,comparedtotheboat
restingonacradle.Thiscrackiscosmeticandisofnostructuralsignificanceasthe
keelboltsaredesignedtosupportthefullweightofthekeel.Thecrack,itself,canbe
filledwithpolyesterfillerputty,suchas"WhiteLightnin",aspartoftheprocedurefor
preparingthebottomoftheboatforantifoulingpaint.
Occasionally,waterfromthebilgemayseepthroughthiscrackwhenboatsarehauled.
Thiswouldbeduetoaslightleakatakeelbolt,whichcanbereadilybeovercomeby
tighteningthekeelboltnuts.Aspartoflaunchingprocedure,checkallkeelboltnuts
fortightnessto90footpoundsbeforetheboatisliftedoutofthecradle.Shoulda
keelboltleakpersist,refertosection28:03.(RefertoI12)
28:00KEELBALLAST(Cont'd)
28:03PROCEDUREFORREBEDDINGKEELBOLTS:Ifitbecomesnecessarytorebedkeel
bolts,werecommendthefollowingprocedure.Thisworkmayprovetobemoredifficult
thatitatfirstappears.Therefore,werecommendthatitbedonebyexperiencedmarine
servicepersonnel.
NOTE:Ifmorethanoneboltneedsrebedding,removeonlyonenutatatime.