Trolling motor question

[tbest08]

I have an older 16 foot pontoon boat that my friends and I use for bowfishing carp. The motor on back is way too loud and its hard to get close enough without spooking them. I want to mount a trolling motor, but dont know much about them. My main question is what pound thrust would I need to effectively move a boat like this?
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[bigpikeguy]

I think 40LB would be plenty for what you need. But it never hurts to go bigger
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[davetclown]

if you have any wind at all, 80-100 minimum
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[flygoddess]

I had an 11'6" Pontoon that I ran a 30 on. It died after a good long life and I replaced it with a 40 (new pontoon and wanted a longer shaft)
I am thinking a 50 and up would be perfect.
But I just bought a 5hp 4 stroke that weighs the same as the battery and is super quiet.
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