building airjohn, not enough thrust??

Airboats with smaller powerplants.
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shoalcreek91
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Joined: Thu Jun 07, 2012 12:45 am

building airjohn, not enough thrust??

Post by shoalcreek91 »

I am building an 14' airjohn, i have an 8hp biggs on it and the 30'' homemade prop is mounted directly on the shaft. im a rookie when it comes to airboats so im not sure why, but it doesnt push fast enough for wat i need. I think i need a different prop but im not sure. any advice would be great! thx, Al.

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bowhunterfl
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Location: high spring

Re: building airjohn, not enough thrust??

Post by bowhunterfl »

The prop I put on my airjohn came from arrowprop he is a good guy and when it comes to mini he is your man about props
14' combee 454 BBC 2to1 belt drive spinnen 3 wirlwind master blasters.

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airjohn81
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Location: riverview , fl

Re: building airjohn, not enough thrust??

Post by airjohn81 »

I have built a couple air johns from 14 footers and found using a red drive or some kind of belt an pully reduction drive works best... Direct drive you need bigger HP motor but still won't be able to use all the power the motor has to offer w out a reduction drive .. I currently have a paraglide motor (28hp 2 stroke w 2.6-1 belt reduction and 48" prop) and does about 35mph w me n gear... And will run all the weeds and grass you want just no dry lol... Arrow prop is definetly who you need for prop selection and they are inexpensive and great product... have had great luck.w them

shoalcreek91
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Joined: Thu Jun 07, 2012 12:45 am

Re: building airjohn, not enough thrust??

Post by shoalcreek91 »

I emailed arrowprop and he said i need a thirty inch prop with 14 degree pitch. i have a thirty inch prop on it and it goes about as fast as a 40 lbs thrust trolling motor. i would just like a little more speed. thanks for the advice guys. if anybody has pics of their airjonhs ide like to check em out.

shoalcreek91
Southern Airboat Member
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Joined: Thu Jun 07, 2012 12:45 am

Re: building airjohn, not enough thrust??

Post by shoalcreek91 »

Hey i found this on the internet would this be a good prop for my 8 hp??
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airjohn81
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Location: riverview , fl

Re: building airjohn, not enough thrust??

Post by airjohn81 »

What are the specs on that prop???? size , pitch, ???

shoalcreek91
Southern Airboat Member
Posts: 6
Joined: Thu Jun 07, 2012 12:45 am

Re: building airjohn, not enough thrust??

Post by shoalcreek91 »

26" prop adjustable pitch, i am goin to put a reduction drive on my boat this winter instead of direct drive.

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