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#12279071 - 06/05/17 08:44 AM Pounds thrust vs. HP???
Wave Away Offline
Angler

Registered: 04/29/10
Posts: 301
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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#12279106 - 06/05/17 08:57 AM Re: Pounds thrust vs. HP??? [Re: Wave Away]
Fish Killer Offline
Big Sexy

Registered: 12/11/04
Posts: 25854
Loc: Weatherford
550 ft lbs of thrust is one horsepower
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#12279114 - 06/05/17 09:00 AM Re: Pounds thrust vs. HP??? [Re: Wave Away]
fouzman Offline
Methuselah

Registered: 01/20/09
Posts: 46962
Loc: Houston, TX
http://www.kylesconverter.com/power/horsepower-to-foot--pounds--force-per-second

There is no hard and fast correlation between the two but here ya go.
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#12279121 - 06/05/17 09:04 AM Re: Pounds thrust vs. HP??? [Re: Fish Killer]
fouzman Offline
Methuselah

Registered: 01/20/09
Posts: 46962
Loc: Houston, TX
Originally Posted By: Fish Killer
550 ft lbs of thrust is one horsepower


Sure you don't mean 55 lbs. thrust?
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#12279303 - 06/05/17 10:34 AM Re: Pounds thrust vs. HP??? [Re: fouzman]
Brad R Online   content
Extreme Angler

Registered: 03/09/15
Posts: 1842
Loc: Texas
Originally Posted By: fouzman
Originally Posted By: Fish Killer
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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#12279793 - 06/05/17 03:47 PM Re: Pounds thrust vs. HP??? [Re: Brad R]
tmd11111 Online   content
Pro Angler

Registered: 04/30/17
Posts: 736
Loc: San Angelo
Originally Posted By: Brad R
Originally Posted By: fouzman
Originally Posted By: Fish Killer
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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#12280259 - 06/05/17 09:18 PM Re: Pounds thrust vs. HP??? [Re: Wave Away]
SteezMacQueen Offline
TFF Celebrity

Registered: 11/02/14
Posts: 5519
Loc: Red Oak, Galveston, and Pagosa...
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.
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#12280369 - 06/05/17 10:25 PM Re: Pounds thrust vs. HP??? [Re: Wave Away]
Bobby Milam Offline
TFF Team Angler

Registered: 07/13/14
Posts: 3381
Loc: Arlington
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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#12280462 - 06/06/17 01:04 AM Re: Pounds thrust vs. HP??? [Re: Wave Away]
jbobo Online   content
Extreme Angler

Registered: 02/26/13
Posts: 2956
Loc: springtown,tx.
I have 2 / 80 lb thrust engine mounted Mk. They push my wellcraft up to 4 mph on gps.
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#12280549 - 06/06/17 06:43 AM Re: Pounds thrust vs. HP??? [Re: Wave Away]
Brad R Online   content
Extreme Angler

Registered: 03/09/15
Posts: 1842
Loc: Texas
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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