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What's the best hull design for an airboat?

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What's the best hull design for an airboat?

Old 07-11-2003, 01:14 AM
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Default What's the best hull design for an airboat?

I'd like it to have good speed and manuverability and still be able to go accross the wet grass. What percentage of the hull should be touching the water when it planes out? I'm going to form it with foam, glass it, and make a mold so I can make a couple of them.
Old 07-11-2003, 04:01 AM
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Default What's the best hull design for an airboat?

Well, if you want it to go on gras syou'll probably need a flatbottomed hull. These are full of positives, as they are wide, so they are stable, they are easy to build , and they are pretty quick. Check out this site if ya want to get some designs.

>>> www.geocities.com/rcairboat78/ <<<

BTW, you dont really need plans for these things. I made a small kit a while back that had a flat bottom but had angles sides to it. It was bout 18" long and powered by me Thunder Tiger .07 I recok on did about 25 kays. Good Luck. please ask if you need more 'elp
Old 07-11-2003, 10:04 AM
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Default What's the best hull design for an airboat?

Where should the CG be? For example the "four". I've read 1/3 from the back. But on that one should it be 1/3 from the back, just using the flat part or the whole hull?
Old 07-11-2003, 05:31 PM
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Default My Hull Design

I'm fairly new to R/C and tried to find information on Air Boat Hull designs and in the end I just had to come up with my own version from what I had seen. No one has specifics about where to place the CG (that I could find). I just guessed. I've attached what the hull looks like for mine.

I'm using a .40 O.S. engine and the overall dimensions are 31" L x 15" W x 3" D.

You can check out other photo's here: //http://storm.prohosting.com/airboat.html
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Old 07-11-2003, 05:32 PM
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Default What's the best hull design for an airboat?

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Old 07-11-2003, 09:20 PM
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Default What's the best hull design for an airboat?

Looks great! I can't get the link to work though? So, where ar you going to put the cg? Has it seen the water yet?
Old 07-12-2003, 01:15 AM
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Default What's the best hull design for an airboat?

i would presume the 1/3rd c of g poin they mentioned is coveres the whole length of the boat. When it comes to the vertical balance, try to get the c of g as low as you can or ir will roll a fair bir, a wide hull also helps this.........
Old 07-12-2003, 01:36 AM
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Default NICE SIZE

[i] I'm using a .40 O.S. engine and the overall dimensions are 31" L x 15" W x 3" D.

You can check out other photo's here: //http://storm.prohosting.com/airboat.html [/B]
mate, that thing will go fast fast fast...........fast.

...........fast..................fast......FAST!!! !!!!!!!!!!!!!!!!!!!!!!!!!


Old 07-12-2003, 02:41 AM
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Default What's the best hull design for an airboat?

is a pic of mine i have discussed balance etc o on my post and there is a link to a site about airboat construction there are a set of plans that can be copied from the site

My site
http://www.geocities.com/will_y66/home.htm

My post
http://www.rcuniverse.com/showthread...992&forumid=43

Design info
http://home.wanadoo.nl/stuipsmulders...set_index1.htm]
Old 07-12-2003, 02:46 AM
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Default What's the best hull design for an airboat?

Mine's 32 x 18, and it'll only go slow. At higher speed(above 1/3rd throttle), it porpoises up and down. I tried up thrust and down thrust, and it still wont go fast. Where should the cg be? Mine is 1/3 from the back.
Old 07-12-2003, 03:00 AM
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Default What's the best hull design for an airboat?

what sort of engine are you using?

i say the c of g should be about 1/3-3/4 rearward
Old 07-12-2003, 04:11 AM
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Default What's the best hull design for an airboat?

I have a leo .37 on it. 1/3-3/4? Do you mean 1/3-1/4 from the rear?
Here's the scenario: When you 1st put it in the water it sits slightly nose high. Give it a little gas and it flattens out, a little more and the nose sticks out of the water, a little more and it starts bouncing, a little more and it'll leap out of the water and it actually did a 180 to the right.
Old 07-13-2003, 06:42 AM
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Default What's the best hull design for an airboat?

1/3rd to 3/4 the length of the boat from the front. so the weight will be rearward.
Old 07-14-2003, 04:12 AM
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Default What's the best hull design for an airboat?

hey airboats are great. i used my friends once. the cg is usually tword the middle of the boat mostly when the prop is centered....... near the center. u cant forget however your up and down thrust. i tried to build my own airboat but my curiosity hit me in the face and i sort of made a tunnel cat. if i had a airplane engine i would have mounted it but i could not get my hands on one. the only drawback of an a-boat is that at about 30 mph they get very unstable. when i had mine i tuned it to run slow, with enogh pwr for fun and not too much that it flips at full throt. you want to have a good amount of up thrust but not too much 'cus to much will lift the front and cause the boat to spin out or flip maybe if your crazy u could lanch it of a wave and pull some good air. tried myself not fun to swim in a get boat. any way if u need more advice e-mail me.
Old 07-14-2003, 01:38 PM
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Default What's the best hull design for an airboat?

My boat has not yet seen the water. I am hoping to have it completed by the end of this month. I have the CG a bit forward of 1/3 but I'm not sure how much and I don't have the engine mounted yet to be able to determine the exact point. I'll let you know how it runs once I get it all done.
Old 07-14-2003, 01:47 PM
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Default What's the best hull design for an airboat?

http://storm.prohosting.com/arners/Airboat.htm

or just cut and paste the above into your browser.

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