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Old Sep 01, 2012, 12:55 PM
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Originally Posted by starscream4002 View Post
I'm going to use a 4mm Picooz tail motor. I think it'll have more speed than a 2.8mm shicoh version. Hmmm... thinking of making it turn by thrust vectoring...

SS
I was planning on using throttle mixed to actuator ports for proportional steering. I still need a rx though and that another $50 for the one I like...
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Old Sep 01, 2012, 06:34 PM
TheyreComingToTakeMeAway!
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okay, since nobody else has an official entry, i might as well go first

this is the smallest boat i can conceivably build with the gear i own. i wanted to go with a normal rudder and one motor, but just couldn't do it right. so this one is twin steering.

for gear it has two 4*8mm motors with custom trimmed 9mm props, 30mah lipo cell and the plantraco micro 9 three channel receiver. if i could direct solder the motors, it could be a little shorter, but i think it might sink without the extra displacement. as it is, its sitting in the water with about 2-2.5mm above the surface, but the tension pulls it right up to the edge of the hull!

i am sure this wont stand for long, but hey, its a start!

smallest boat contest (0 min 38 sec)
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Old Sep 01, 2012, 07:02 PM
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also, it weighs in at a whopping 3.6 grams with the deck on it, and 3.4 without. so its total displacement is around 3.4cc of water.

here is a better quality video of it in action:
smallest boat 2 (0 min 52 sec)
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Old Sep 01, 2012, 08:58 PM
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Cute.

It looks like a little styrofoam ice chest with motors.

Pete
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Old Sep 02, 2012, 10:51 AM
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Thrust vectoring is probably the only way to get this small.

I have another idea. Can we divide this into a "make it work" class and a "resembles a real boat" class?
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Old Sep 02, 2012, 11:56 AM
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Quote:
Originally Posted by boredom.is.me View Post
Thrust vectoring is probably the only way to get this small.

I have another idea. Can we divide this into a "make it work" class and a "resembles a real boat" class?
Which class does a motored sail boat fall into? That's right. I AM thinking of disguising the RX as a sail!

SS
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Old Sep 02, 2012, 04:13 PM
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Nice! That would be able to qualify as a scale.
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Old Sep 03, 2012, 05:10 AM
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My personal goal is a sailboat.

My introduction to sail was a Windmill class sloop that I built when I was twenty-two. It was a fantastic sailer and one heck of a boat for a self-taught sailor to learn on.

It's not a matter of making the world's smallest sailboat, but making a small, functional sailboat with decent performance. I want to stick a motor in it, mainly for retrieval purposes since the places I can sail are not places I can wade out after a boat or launch a kayak etc.

My first attempt at a motorboat was a testbed for motor control for a future sailboat and my interest in eventually making a folding prop is because whatever scale you care to work at, from full-sized to tiny, a sailboat will always work best with minimal drag producing things to slow it down.

Sad to say, at seventy-four I'm unlikely to ever sail a hot International 14 in a good breeze but sail still interests me and always will. Everything from conventional to rigid airfoil/hydrofoil equipped sailing machines and especially autonomous, goat driven robotic boats.

Practically I have to stick to small sailboats and t really don't think a good sailboat can be made in one inch size.

I admire derk's motorized ice chest but I have to admit that I'd much rather see something that even a three year old can recognize as a boat even sitting still in the water.

I'll be watching with real interest, but in my mind I'll be working on something a bit larger that looks a lot more scale above the wateline.

Below the waterline things have to be more practical at tiny scales since a small boat sails in hurricane like conditions most of the time.

Pete
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Old Sep 03, 2012, 07:24 AM
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I have another idea. Can we divide this into a "make it work" class and a "resembles a real boat" class?
well... the criteria were pretty much fixed in post #1 when i started the thread. and your formalized contest rules sound exactly what i had in mind so just added them to that post. for now id say size is the goal. but i must admit petes constant nagging has gotten to me and i really want to eventually do something that looks like a real boat. if nobody else does it first ill start another thread for "worlds smallest SCALE boat". but whos to judge what is scale? my 1st attempt is certainly more "boatlike" than derks but his is smaller and he put up a video. if it can backup and turn hes definitely current world champion. in that case ill add his to post #1.

unfortunately im unable to use flash player so i wonder if it might be possible to upload a short version to rc groups video gallery? or maybe somebody could describe whats going on there. im dying of curiosity.
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Old Sep 03, 2012, 11:50 AM
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here ya go dave: http://www.rcgroups.com/forums/showt...0#post22628582

sorry for the terrible quality, the second video looks better but is much larger file size.
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Old Sep 03, 2012, 12:53 PM
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here ya go dave: http://www.rcgroups.com/forums/showt...0#post22628582

sorry for the terrible quality, the second video looks better but is much larger file size.
Thanks a lot! now I can watch the vid, too!

SS
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Old Sep 03, 2012, 06:17 PM
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thanks derk. that was absolutely amazing. NEW WORLD CHAMPION!!!!!

(now i have to figure out how to shave 2mm off a hull that is only 1mm thick. lol! )
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Old Sep 09, 2012, 12:57 AM
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Hmmm... I'm imagining a boat which is some kind of reaction steam drive and has one red boiler and one green boiler. You'd control it with a pair of red and green lasers, fairly powerful. I'll bet you could make that one very small! Not sure about backing up, unless you went with 4 boilers, 4 colors, and 4 lasers. Or two solar cells with color filters and two very small pager motors. Backing up still a problem.

Probably there's some creative solution which is better than the above. Temporarily attach a moth to the deck and use a light?
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Old Sep 09, 2012, 07:50 AM
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Would a cockroach guided by cheese on a string count, it would still be wireless.

Once I've got all my crap dug out I'll have a go at this.
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Old Sep 09, 2012, 12:09 PM
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Would a cockroach guided by cheese on a string count, it would still be wireless.

Once I've got all my crap dug out I'll have a go at this.
Is that possible?
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