$rankprofile = Get-FASTSearchMetadataRankProfile -name default
$rankprofile.QualityWeight = 80 
$rankprofile.Update()

New-FASTSearchMetadataRankProfile -Name Test

# Change the weight of some static(quality) component

$QualityComponents = $rankprofile.GetQualityComponents()
$temp = $QualityComponents | Where-Object { $_.ManagedPropertyReference.Name -eq "urldepthrank" }
$temp.Weight = 100
$temp.Update()

# add a new managed property to the static rank components

$mp = Get-FASTSearchMetadataManagedProperty -Name Rating
$QualityComponents.Create($mp, 50)

# to change the managed property field boost, give higher priority to png files

$mp = Get-FASTSearchMetadataManagedProperty -Name fileextension
$rankprofile.CreateManagedPropertyBoostComponent($mp, "png,1000")
$rankprofile.CreateManagedPropertyBoostComponent($mp, "jpg,500")
$rankprofile.CreateManagedPropertyBoostComponent($mp, "gif,100")
$rankprofile.Update()
$rankprofile.GetManagedPropertyBoosts()

# give higher ranking to files off the shared folder 

$mp = Get-FASTSearchMetadataManagedProperty -Name sitename
$rankprofile.CreateManagedPropertyBoostComponent($mp, "file://demo2010a/Search,1000")
$rankprofile.update()
$rankprofile.GetManagedPropertyBoosts()