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My new Airboat, one question, should the sides be rounded ?

Old 05-08-2008, 02:51 AM
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kokker
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Default My new Airboat, one question, should the sides be rounded ?

Hey All

after my first to failed atemts(failed... well thay are undstabel at high speeds, the one of them flyes abow the wather)

im am now trying somthing pepol told me should improve the design.
i im just left with a question. i see lots of boats that run realy well and slids like a dream,

but is it a good idea to round in the sides as well ?

it is all made out of baltser wood waight for the hull as it is now 70g

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Old 05-08-2008, 02:54 AM
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kokker
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Default RE: My new Airboat, one question, should the sides be rounded ?

oh by the way
i looked alittle after this guy´s design

[link=http://video.google.com/videoplay?docid=997903488324508764]RC Airboat Drift Part III[/link]
Old 05-08-2008, 05:59 AM
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Default RE: My new Airboat, one question, should the sides be rounded ?

If your boat is ultralight as the one in the video, you can get away with 90* sides. But with the ultralight boat your gonna be suspect to blowing over.

If you want a good sliding boat, use 45* sides. Rounded sides will cause the boat to rock up when cornering. Turn chimes will do the same thing.
Old 05-08-2008, 08:13 AM
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kokker
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Default RE: My new Airboat, one question, should the sides be rounded ?

ok, i see ...
i think maby some of my problems lies with the driver

i have a larger model , but it seem to have a tehdese to tilt when i try to slide it, and it had some problem with high speed.... seems to wanna leev the wather...
og that model i have 45* sides, and wrong front.... i tryed to fi it, but havet got around to test if it have worked yet...

The Old front


the new


Wraped in Ducktape(for test)
Old 05-08-2008, 12:21 PM
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jasperrc
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Default RE: My new Airboat, one question, should the sides be rounded ?

Generally speaking, if the sides are angled at 45 degrees and the the transition between the bottom and side is a sharp angle rather than rounded, the wider the boat, the better the slide, but the wider the boat the more susceptible to flipping at high speed. It's a balancing act.
Old 05-08-2008, 04:57 PM
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kokker
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Default RE: My new Airboat, one question, should the sides be rounded ?

ok, my biggest are
50cm(19,6") long and
25cm(9,8") wide
waight 1Kg

my new one is
40cm(15,7") long
20cm(7,8")wide
without sides
500g

am i total of with theas 1L:½W boats ?
i coulden find any blueprints or somthing to give an idea aboudt what other have done...
so the 2 i have build is from looking at others.....
thay are fun.. but i have a loong way to go, befor i am happy, Speed and slide is the goal, and NO nitro
Old 05-08-2008, 07:04 PM
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Default RE: My new Airboat, one question, should the sides be rounded ?

heres is you some plans.. http://rcairboats.net/phpBB/viewforu...197821faaf57ee

http://m-ab-a.com/phpBB/viewforum.ph...1bbaccf6650dad
Old 05-08-2008, 07:08 PM
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Default RE: My new Airboat, one question, should the sides be rounded ?

The general rule for flat bottoms is 1.5-2(L) x 1(W) in dimension. Meaning if the boat is 24" long the width should be about 10-12".
I like making the bottoms of my flat bottoms about 1-2" wider than the prop that I'll be using.
Old 05-09-2008, 05:21 AM
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Default RE: My new Airboat, one question, should the sides be rounded ?

How aboudt the design of the Rudder ?

it seems like a box design give to much thrust at the buttom, and the boat tends to lean into the turn, this is good for handling, but if i want it to slide will it be better if i increas the sise at the top of the rudder to give more thrust higher up to kompensade for the boats will to turn in to the turn, and insted slide around ?

any one wanna comment ?
i have seen alot off you guys have teardrop shaped rudders.... ???

i am current ly working on an low profile Ultra light waight speed airboat, but i want it to slide like crazy
i am trying to learn from my eralyer models, and get some more indput..... so i get i right

.. i see a lot of pepol claming that thay have the speed record for RC Airboat, a lot of classes(for nitro)
what aboudt Electric, do thay fall under the Other class ?
Old 05-09-2008, 06:01 AM
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Default RE: My new Airboat, one question, should the sides be rounded ?

The RCAA will be developing classes for electric in the near future. We are looking into how to classify them since there are so many variables with the electrics.

Old 05-09-2008, 09:34 AM
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Default RE: My new Airboat, one question, should the sides be rounded ?

Not to hijack the thread, but what if you base the clasifications on the size of the motor, or cell count? Lets say there are speed 400 class, speed 600, 22mm brushless, 24mm brushless, ect? You could also define minimum weights for each one, thereby keeping cost down, Ie, balsa built or foam as oposed to carbon fiber built. It would be possible to get crazy with the rules, but I think a few classes of the most popular types would be the way to start, maybe only designating a max cell count, motor type, and minimum weight.

Maybe we could start another thread on this?

Kurt
Old 05-09-2008, 02:35 PM
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Default RE: My new Airboat, one question, should the sides be rounded ?

it would be nice it the oficial records for each class where published... (maby thay are, but i ditten find them)

engien size ,Prop size ,Voltage(lipo Count 2S,3S,4S,6S), Waight
as i see it will be the factors that devides the boats. (Prop is les relevent, as it taks the right engien to pull it)

if the classe shuld resambel the Nitro classes then it would have to be Voltage and Engien
Old 05-12-2008, 01:40 PM
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Default RE: My new Airboat, one question, should the sides be rounded ?

What about wattage? Or maybe weight? Maybe say, 1000 watt max,1500, ect, divided into hydro, and mono? Lets start a new thread and get this thing rolling!

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