I am diving wet with a DiveRite Transpac BCD. I believe I should put the weight belt on after the crotch strap to make ditching the weights easier. Is this true?
The general answer that comes up here is that it depends. Are you more worried about losing your weightbelt and rocketing to the surface OR not being able to quickly ditch your belt.
Tech divers for example would much prefer the former from not occuring since they encounter virtual overheads, like deco stops.
On a quick note, you should be able to unstrap your waist strap and crotch strap then ditch your belt with relative ease.
Your reasoning of putting the weightbelt over the crotch strap to allow easy ditching is right. It does make it easy.
There are divers who put their weightbelt under the crotch strap allowing for "uneasy" ditching, but only by comparison. It's really not that much harder.
It's a different diving mindset behind this config.
The main idea is you take preventative measures whether dive planning, dive practice, and/or redundant buoyancy, that will prevent you from getting into a situation where you would need to ditch your weight to reach the surface.
This can mean:
- carrying a lift bag should your BC bladder rupture
- gear maintenance/rinsing to prevent gear malfunctions or breakdowns
- not running into sharp objects
- gas awareness so you never run OOA
- always being neutral so you never find yourself OOA and negative
- dive planning and diving the plan so you avoid sticky situations
- being properly weighted
- keeping up on dive fitness
etc etc.
Bottom line, do what you're comfortable with. There are risks with both ways.