Airboat Prop

Airboat propeller discussion.
Post Reply
tonylane
Southern Airboat Member
Posts: 2
Joined: Thu Aug 06, 2020 1:49 pm

Airboat Prop

Post by tonylane »

Hello I'm new to air boating. I bought a 12 foot by 8 foot Fiberglass hull with a 1/4" polymer plating on the bottom. It had a 305 chevy engine with a 66" x 34 wooden prop on it. I'm putting a 5.7 mercruiser 350 chevy marine engine in it with 260 HP. What prop should I use. It's a direct drive. Thanks

Striker543
Site Supporter - I
Site Supporter - I
Posts: 1035
Joined: Wed Oct 13, 2010 11:03 pm
Location: Miami/Orlando, Fl

Re: Airboat Prop

Post by Striker543 »

I would find a used 68” or 70” composite prop rather than buying a new wood prop - you will get more for your money. Also chances are your engine is not making 260hp at 3,000rpms, which is the max rpms you should turn a prop (I am assuming you are direct drive based on the prop you currently run).

User avatar
kwanjangnihm
Site Supporter - IV
Site Supporter - IV
Posts: 2127
Joined: Sat Mar 30, 2013 8:23 pm
Location: Bartow FL

Re: Airboat Prop

Post by kwanjangnihm »

tonylane welcome to SA! :salute:

Striker hit the same points I had in mind. (lower hp at ~2800-3000 rpm)

Here is an older thread with some pro's & con's using this platform.

viewtopic.php?f=48&t=62864&p=611802&hil ... er#p611802

Good luck with whatever you decide.
He'll cut your throat, baby, stick you in the back, drive off in your Cadillac.
He's more trouble than you think, he'll kill your sugar, leave you in the drink.

tonylane
Southern Airboat Member
Posts: 2
Joined: Thu Aug 06, 2020 1:49 pm

Re: Airboat Prop

Post by tonylane »

Thanks guys helped a lot The marine engines are built to have more torque at lower RPM'S what I'll do is figure torque and HP at 3,000 RPM and go from there.

WhirlWindProps
Southern Airboat Member
Posts: 9
Joined: Fri Jun 26, 2020 6:44 pm

Re: Airboat Prop

Post by WhirlWindProps »

Our CarbonMax Narrow 72" propeller is pefect for that engine. Feel free to call in for specific questions: 619-562-3725

https://whirlwindpropellers.com/airboat ... 72-narrow/

terrible ted
Southern Airboat Member
Posts: 2877
Joined: Tue Aug 12, 2008 8:07 pm
Location: orlando

Re: Airboat Prop

Post by terrible ted »

I would use 4 0r 6 blade warp or similar on a standard small block dd. I say it was better balance on my old dd small blocks, but 2 blades work just I think there a little harder on the crank.

Post Reply

Return to “Prop Talk”