Required HP?

A general, non-powerplant specific, discussion on airboat technology, ie., hulls, rigging, polymer, etc..
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Planeguy
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Required HP?

Post by Planeguy »

Is there a "rule of thumb" way to determine how much HP and/or thrust a boat should have? I understand about the difference changing pitch on a prop can make.

Thanks,
Jeff

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scottyroll
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Re: Required HP?

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A lot of things to factor in but my unscientific pull a number out of my A$$ answer would be one horse for every 4 lbs. of boat weight to run dry. It has worked for me each time so far on a geared carmotor setup.
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mojoe
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Re: Required HP?

Post by mojoe »

X2 on 1/4hp/lb

I have estimated my aluminum 0-540 at .29hp/lb and it will run most dry at 2100-2200rpm. Moist grass at 1700 and it will run for miles bone dry without ever flooring it. And even if I do, I have a pedal stop that keeps it from ever really being floored.

If I load it down (700 lb) and approach .19hp/lb it will still run dry well, but I find myself having to get on it when it's sticky or up hill.

If you can target .25hp/lb loaded it will really run impressively!
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Hardtail
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Re: Required HP?

Post by Hardtail »

200 hp can easily push 1200 pounds on dry ground which would be 6 pounds per HP with steel flex, I'm not sure about if it were on poly.

Bdriller
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Re: Required HP?

Post by Bdriller »

scottyroll wrote:A lot of things to factor in but my unscientific pull a number out of my A$$ answer would be one horse for every 4 lbs. of boat weight to run dry. It has worked for me each time so far on a geared carmotor setup.
would that be .25 per pound?

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mojoe
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Re: Required HP?

Post by mojoe »

:cheers:
Bdriller wrote:
scottyroll wrote:A lot of things to factor in but my unscientific pull a number out of my A$$ answer would be one horse for every 4 lbs. of boat weight to run dry. It has worked for me each time so far on a geared carmotor setup.
would that be .25 per pound?
Mark 7:9

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Tony480
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Re: Required HP?

Post by Tony480 »

As much as you can afford

terrible ted
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Re: Required HP?

Post by terrible ted »

Tony480 wrote:As much as you can afford

don't listen to this man its more than you can afford

dshaw94
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Re: Required HP?

Post by dshaw94 »

mojoe wrote:X2 on 1/4hp/lb

I have estimated my aluminum 0-540 at .29hp/lb and it will run most dry at 2100-2200rpm. Moist grass at 1700 and it will run for miles bone dry without ever flooring it. And even if I do, I have a pedal stop that keeps it
If I load it down (700 lb) and approach .19hp/lb it will still run dry well, but I find myself having to get on it when it's sticky or up hill.

If you can target .25hp/lb loaded it will really run impressively!

So you've got a 540 boat that ways 1034lbs????? I'd say it should run dry like a boss!!
We all got it coming, kid. (William Money)

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