Hello guys,
I'm new on this forum, and saw lot of great articles here, hope you can help me to.
The problem is related with power of trolling motors. I have catamaran type boat, with two 4m long and about 0.7m width pontoons. The weight of fully loaded boat with passengers is about 1500lbs. For this boat I use two 86lbs 24V motors. Maximum speed of boat measured with GPS was about 4.349598mph(7km/h) with total current draw about 80amp.
But I'm not sure how effective I'm using this motors. Because I read lot of articles about trolling motors and rule for choosing motors is same: 2 lbs of thrust for every 100lbs.
For example here:
https://www.trollingmotors.net/blogs/selection/86933703-trolling-motor-thrust-guide
is given same formula- 2 lbs of thrust for every 100lbs. So in my case 1500/100*2=30lbs. Even if I take 55lbs motor, this is far away from 2*86lbs. Also I know, that speed of the boat depends of rpm of motor and pitch of prop, not only lbs. Motors with different lbs can go in same speed.
So my questions:
1. how many lbs I need for my boat to achieve about 4mph?
2. If boat goes lets say 3 miles per hour with one 86lbs motor and uses for example 30A current. What happens if I turn on another identical 86lbs motor? Did total current must be 30A or 60A for same speed at same conditions?
sorry for english.
Greately thank you.
I'm new on this forum, and saw lot of great articles here, hope you can help me to.
The problem is related with power of trolling motors. I have catamaran type boat, with two 4m long and about 0.7m width pontoons. The weight of fully loaded boat with passengers is about 1500lbs. For this boat I use two 86lbs 24V motors. Maximum speed of boat measured with GPS was about 4.349598mph(7km/h) with total current draw about 80amp.
But I'm not sure how effective I'm using this motors. Because I read lot of articles about trolling motors and rule for choosing motors is same: 2 lbs of thrust for every 100lbs.
For example here:
https://www.trollingmotors.net/blogs/selection/86933703-trolling-motor-thrust-guide
is given same formula- 2 lbs of thrust for every 100lbs. So in my case 1500/100*2=30lbs. Even if I take 55lbs motor, this is far away from 2*86lbs. Also I know, that speed of the boat depends of rpm of motor and pitch of prop, not only lbs. Motors with different lbs can go in same speed.
So my questions:
1. how many lbs I need for my boat to achieve about 4mph?
2. If boat goes lets say 3 miles per hour with one 86lbs motor and uses for example 30A current. What happens if I turn on another identical 86lbs motor? Did total current must be 30A or 60A for same speed at same conditions?
sorry for english.
Greately thank you.