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building airjohn, not enough thrust??

Posted: Thu Jun 07, 2012 1:14 am
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.

Re: building airjohn, not enough thrust??

Posted: Thu Jun 07, 2012 6:11 am
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

Re: building airjohn, not enough thrust??

Posted: Thu Jun 07, 2012 6:31 am
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

Re: building airjohn, not enough thrust??

Posted: Tue Jun 12, 2012 9:02 pm
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.

Re: building airjohn, not enough thrust??

Posted: Sat Jun 16, 2012 5:59 pm
by shoalcreek91
Hey i found this on the internet would this be a good prop for my 8 hp??

Re: building airjohn, not enough thrust??

Posted: Mon Jun 18, 2012 2:21 pm
by airjohn81
What are the specs on that prop???? size , pitch, ???

Re: building airjohn, not enough thrust??

Posted: Mon Jun 18, 2012 11:40 pm
by shoalcreek91
26" prop adjustable pitch, i am goin to put a reduction drive on my boat this winter instead of direct drive.