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Newbie frenchie need your discard for 1st build

Posted: Wed Jan 07, 2015 7:13 am
by roobish
I live in nancy in france
i speak english not very well, please simple answer and no joke!
i'm 32 and passionate about airboat but in france there is no airboat and no forum!you are lucky!
My motor is a rotax 277 with belt reductor 1:2.20
26hp 6250rpm
I build my hull 8'8''x4'4'' in plywood.
Which size wide for my hull? i think 16''
I want a wood 2 blade prop because the price,which size and pitch?
Which max speed for my airboat?
I will sail in deep water, river and lake.
Thank for your answer

Re: Newbie frenchie need your discard for 1st build

Posted: Wed Jan 07, 2015 7:25 am
by scottyroll
First things first - your English or rather "understability" is actually better than a good majority of us here on the SA forum :lol:

If your referring to the 16" sides on your airboat I would think that would work as long as you don't take it out in poor weather conditions because most airboats will not fare well in rough water.

I would guess a top speed of maybe around 20kph depending how your hull turns out and if it has a straight and solid bottom.

Find out what the local laws are for operating such a boat in your area (probably less laws than us Americans even though WE are the land of the free :roll: )

A good airboater will always tell someone where he is going and when he plans to return. We also enjoy riding together. If your the only one in a airboat definitely have some one else follow you in another vessel, but no too close, or you risk collision or sinking via water wake.

Re: Newbie frenchie need your discard for 1st build

Posted: Wed Jan 07, 2015 9:38 am
by papajack
You might want to research some of the older discussions in the mini airboat section of this forum. There have been several builds discussed with very small hulls and small engines. With limited displacement and underpowered engines most of these projects were doomed from the beginning. As far as your question about a prop, you may want to contact Arrowprop. They build wooden props for applications like you are considering. Good luck with your project.

photo of my build

Posted: Wed Oct 26, 2016 7:01 am
by roobish
The project begin

Re: photo of my build

Posted: Wed Oct 26, 2016 7:20 am
by jeepinocala1111
roobish wrote:The project begin


That looks VERY narrow? How wide is it?

Re: Newbie frenchie need your discard for 1st build

Posted: Thu Oct 27, 2016 1:39 am
by roobish
wide is 48inch
length is 103inch

Re: Newbie frenchie need your discard for 1st build

Posted: Thu Oct 27, 2016 8:22 am
by Gary S
Looking good on your build. You might want to drop your motor down some. You are narrow and you are going to get a torque roll. You will not lose any push dropping tips of the prop below the transom. Most of the push comes from closer to the hub. Know that sounds crazy but it true. I think it is neat you being a pioneer is one of the most addicting things I have done. When you put it in the water please find someplace shallow to get the feel of what you have. And do it with only you in the boat. Be safe and have fun.

Re: Newbie frenchie need your discard for 1st build

Posted: Fri Oct 28, 2016 12:16 pm
by helicsher
Your going to the bottom with that thing
You need to make it wider

Re: Newbie frenchie need your discard for 1st build

Posted: Fri Oct 28, 2016 3:39 pm
by john1edwards
You need to go wider, for 2 reasons, first it will help you get on a plane easier. the second reason is for safety it will be alot better handling and stable, if you went to at least 60 inches wide. my opinion

Re: Newbie frenchie need your discard for 1st build

Posted: Sat Oct 29, 2016 9:03 am
by roobish
the build Gg kustom is 4x8, no?
It seems stable.

Re: Newbie frenchie need your discard for 1st build

Posted: Sun Oct 30, 2016 6:21 am
by Gary S
The longer and wider you go the more stable it will be. You have to remember your center of gravity is higher. The higher it gets the more it wants to roll over. That is why I suggested lowering the motor to try and get weight closer to the bottom of the boat. That is also why I said stay shallow as possible when you try it out. Another thing about trying it out is you don't have steering unless you have air moving over the rudders. If you get in trouble your first response would probably be to let off gas. Keep in mind sometimes you just have to stand on the throttle to get out of trouble.

Re: Newbie frenchie need your discard for 1st build

Posted: Sat Nov 05, 2016 6:58 am
by roobish
I lower the engine 10 inch for a best center gravity.
I do little to change the width of the hull.
What do you think?

Re: Newbie frenchie need your discard for 1st build

Posted: Sat Nov 05, 2016 8:40 am
by Gary S
It would have been better to be wider, but without starting over I don't know what you can do .Droping the motor will help. Early boats in the 50s and 60s 4 foot wide,but 10 and 12 foot long. They were used in shallow water in the marsh. They performed good with most having a 65 HP motor, but they did have a tendency to turn over. I can not say too many times, stay in shallow water when you try it out. Be the only one in the boat, and do not tie yourself into it. I also have to warn you, the first time it gets on a plane and you go into a slide you will be hooked for life. And the only thing that will help is a bigger boat with more HP. You are bringing a new sport to your country and I think that is wild. Stay safe keep us informed and have fun with it.

Re: Newbie frenchie need your discard for 1st build

Posted: Sat Mar 18, 2017 1:36 pm
by Arnaudd
Salut.je suis à Metz et je construis aussi!! Tu est toujours dans la construction?.

Re: Newbie frenchie need your discard for 1st build

Posted: Sat Mar 18, 2017 1:36 pm
by Arnaudd
Salut.je suis à Metz et je construis aussi!! Tu est toujours dans la construction?.

Re: Newbie frenchie need your discard for 1st build

Posted: Sat Mar 18, 2017 10:38 pm
by Lwells
You guys might want to explain to him what you mean by shallow water for most think shallow water to be 5 to ten feet deep. I ran in the everglades this weekend and I thought I had been running in shallow water till I seen what most of you guys run in. My toilet holds more water than you guys run in at the glades.lol