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Pounds thrust vs. HP???
#12279071
06/05/17 01:44 PM
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Joined: Apr 2010
Posts: 324
Wave Away
OP
Angler
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OP
Angler
Joined: Apr 2010
Posts: 324 |
Weird question but how does pounds thrust convert into HP? I've got a delaminated Triton hull that I've parted out and am going to throw a kicker motor on and cruise the local bay. I know how "quickly" it moved with my Fortrex 112 so trying to get a reference point.
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Re: Pounds thrust vs. HP???
[Re: Wave Away]
#12279106
06/05/17 01:57 PM
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Joined: Dec 2004
Posts: 27,659
Fish Killer
Big Sexy
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Big Sexy
Joined: Dec 2004
Posts: 27,659 |
550 ft lbs of thrust is one horsepower
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Re: Pounds thrust vs. HP???
[Re: Wave Away]
#12279114
06/05/17 02:00 PM
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Joined: Jan 2009
Posts: 50,042
fouzman
Methuselah
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Methuselah
Joined: Jan 2009
Posts: 50,042 |
"Things turn out best for those who make the best of the way things turn out" - Zachary Troy Schrah - a young man with vision far beyond his years.
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Re: Pounds thrust vs. HP???
[Re: Fish Killer]
#12279121
06/05/17 02:04 PM
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Joined: Jan 2009
Posts: 50,042
fouzman
Methuselah
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Methuselah
Joined: Jan 2009
Posts: 50,042 |
550 ft lbs of thrust is one horsepower Sure you don't mean 55 lbs. thrust?
"Things turn out best for those who make the best of the way things turn out" - Zachary Troy Schrah - a young man with vision far beyond his years.
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Re: Pounds thrust vs. HP???
[Re: fouzman]
#12279303
06/05/17 03:34 PM
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Joined: Mar 2015
Posts: 2,120
Brad R
Extreme Angler
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Extreme Angler
Joined: Mar 2015
Posts: 2,120 |
550 ft lbs of thrust is one horsepower Sure you don't mean 55 lbs. thrust? No, it is 550 ft-pds. per second. So, horsepower measures "work" where thrust only measures a static force . . . like someone leaning against a wall. I haven't looked at the various converters but one HP = 735 watts. You can compare that to the wattage off numbers provided by Minn Kota and others to see what various sized trolling motors pull. If you are just trying to figure out max speed, most TMs properly sized for a boat are designed to push around at about 5 mph I think. Brad
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Re: Pounds thrust vs. HP???
[Re: Brad R]
#12279793
06/05/17 08:47 PM
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Joined: Apr 2017
Posts: 12,181
tmd11111
TFF Guru
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TFF Guru
Joined: Apr 2017
Posts: 12,181 |
550 ft lbs of thrust is one horsepower Sure you don't mean 55 lbs. thrust? No, it is 550 ft-pds. per second. So, horsepower measures "work" where thrust only measures a static force . . . like someone leaning against a wall. I haven't looked at the various converters but one HP = 735 watts. You can compare that to the wattage off numbers provided by Minn Kota and others to see what various sized trolling motors pull. If you are just trying to figure out max speed, most TMs properly sized for a boat are designed to push around at about 5 mph I think.
Brad 5mph with an electric trolling motor? Dang you'd have to turn the thrust down in a no wake zone. 2.5-3 mph is more the norm.
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Re: Pounds thrust vs. HP???
[Re: Wave Away]
#12280259
06/06/17 02:18 AM
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Joined: Nov 2014
Posts: 23,404
SteezMacQueen
TFF Guru
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TFF Guru
Joined: Nov 2014
Posts: 23,404 |
Haha....I have pretty big trolling motor on a 16ft boat. It's an 80lb Ultrex. Two group 31 bluetops. On a good day, at max thrust, the boat manages 2.8mph....gps of course.
Eat. Sleep. Fish.
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Re: Pounds thrust vs. HP???
[Re: Wave Away]
#12280369
06/06/17 03:25 AM
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Joined: Jul 2014
Posts: 4,340
Bobby Milam
TFF Team Angler
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TFF Team Angler
Joined: Jul 2014
Posts: 4,340 |
Yeah, I've never seen a trolling motor do 5 mph. I'm about 2 with 80# on a 17.5'. With a 101 on it I was about 2.4.
Something in the 2hp range will be much faster than your trolling motor
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Re: Pounds thrust vs. HP???
[Re: Wave Away]
#12280462
06/06/17 06:04 AM
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Joined: Feb 2013
Posts: 3,730
jbobo
TFF Team Angler
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TFF Team Angler
Joined: Feb 2013
Posts: 3,730 |
I have 2 / 80 lb thrust engine mounted Mk. They push my wellcraft up to 4 mph on gps.
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Re: Pounds thrust vs. HP???
[Re: Wave Away]
#12280549
06/06/17 11:43 AM
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Joined: Mar 2015
Posts: 2,120
Brad R
Extreme Angler
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Extreme Angler
Joined: Mar 2015
Posts: 2,120 |
I think that is likely correct, that my 5 mph stat is too high, that it would be tough to achieve 5 mph in a larger boat.
TMs are generally designed to get up to their slow speeds fast at the expense of top end speed.
Back on HP calcs: It doesn't matter how those three inputs are juggled. It takes 1 HP to lift 550 lbs. one foot over one second . . . and also 55 lbs. 10 feet over one second.
Brad
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