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775 Size 3s 16 Inch Airboat

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775 Size 3s 16 Inch Airboat

Old 04-03-2008, 07:00 AM
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Woodmandan2
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Default 775 Size 3s 16 Inch Airboat

Hey. I just build this airboAT from scratch 4mm balsa, and I am goiing to sheet it in 2mm acrylic plastic. Im goin a bit overkill and got two 550's or a 775 electric motor in it, runnin on a 120a boat esc. I should be fine amp wise. Can anyone reccomend a prop? also wat motor would you put the prop on? A big prop would not be a problem amp wise, I hope to make a fun lit'l bugger
Thanks
Dan
Old 04-03-2008, 10:19 AM
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crispyspa
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Default RE: 775 Size 3s 16 Inch Airboat

Not an electric guy....so I have no idea, but it sounds like an interesting project. someone should chime in with an answer for you.
Old 04-04-2008, 12:28 AM
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Default RE: 775 Size 3s 16 Inch Airboat

Okay, I got this thing pretty much done, it looks wsweet ill have some pics up later. Im gonna ask the local guy if he knows a good prop from these motors. Im gonna prey that this thing don't sink

Dan
Old 04-04-2008, 08:06 PM
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Default RE: 775 Size 3s 16 Inch Airboat

anyone??? I think I'll try a 8*4 prop and a 9*6 prop to start off, results later
Dan
Old 04-04-2008, 11:28 PM
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Default RE: 775 Size 3s 16 Inch Airboat

with not a lot of electric guys lurking about here, it's hard to get info. Do your testing and trial and error, then you could be the electric "guy" with the answers.
Old 04-05-2008, 07:10 AM
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Default RE: 775 Size 3s 16 Inch Airboat

Well that really sucks about not havin many electric guys.... I think my hull is a bit too small because when I gunned it she rolled. It didn't wanna travel across 2 inch high grass, im running a 9*6 prop with a 11.1v lipo, is there something i am din wrong? I think I will buy trim tabs for this little thing and hope the best!
Dan
Old 04-05-2008, 01:08 PM
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Default RE: 775 Size 3s 16 Inch Airboat

It is probably top heavy and not wide enough-I run a 540 with a 9 by 6 prop and my hull is 20" by 11".I'm using nicads so most of the weight is in the hull and not on top.[8D]
Old 04-05-2008, 09:45 PM
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Default RE: 775 Size 3s 16 Inch Airboat

O crap, does that mean I gotta build a whole new hull, or can I get away with this by using trim tabs? My motor is just high enough so that there is about 1cm of distance between the prop and the hull. any Lower I think it will hit. Does your boat go across land? Mine doesn't like to and it just kinda lurches. Thanks for all the replys though
Dan
Old 04-06-2008, 12:17 PM
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Default RE: 775 Size 3s 16 Inch Airboat

If it is top heavy and hull is too narrow trim tabs are not going to help-when you gun the motors the torque causes it to roll.Mine will go on wet grass but not dry land but it was not built for speed.A wider hull will give you more stability.
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Old 04-07-2008, 04:19 AM
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Default RE: 775 Size 3s 16 Inch Airboat

Well it looks like I have a new project on my hands, Im gonna build somthbing that professionals designed this time (cajun gator boat)
Dan
Old 05-03-2008, 01:47 PM
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Default RE: 775 Size 3s 16 Inch Airboat

[:@][:@]
Old 05-05-2008, 12:50 AM
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Default RE: 775 Size 3s 16 Inch Airboat

hey, i build an Electric Airboat simaler to yours, with an Brushless engien and a 8by6 prop running on 4 Lipo Celles (14.8V)
my Airboat runs fine on land, but it has problems getting started, i think the problem lies here

my engine is an 1050Rpm/V at 14.8V it runns aprox. 15000Rpm
most nitro engiens runn 20000 - 30000 Rpm

so thay will ha some more pull....
i am workin on modifying an 4050Rpm/V engine with an gear so it purs out aboudt 1500-1800 rpm/V

i will post my results later,


how dos your boat run on water ?
how are you hull shaped ?
where dit you buy you canjun gater bluprints ?

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