Jim and All,
I went with the 24 Lb thrust as to not require a full size deep cycle battery.
The PA -12 is heavy to start , add all the gear and its quite a load. Since the 24 only draws approx 18 Amps at full speed I could go with a 50 Ah battery. (Still weighs 30 lbs) That and they are getting good reviews. I also saw a youtube video of PA-12 with this motor and it moved the PA 12 very well.
https://www.youtube.com/watch?v=CZOeZ9HGgow. I will post some pics
of my install.
Steve