Make a Boat Powered by Fire.

There are many ways to power a boat - propellers, aquajets, sails, powerful fans, turbo-jets, rockets, and pulse-jets.

There are few ways, though, as gentle and serene as the warmth of a candle.

Step 1: What you Need.

Fire-boats need two important properties - to be light, and non-flammable.

My Clubbers used foil pie-tins as the hulls of the boats, kitchen foil as the sails and tea-lights to provide the heat.

We have, in the past, had success with normal-sized candles trimmed to only half an inch in height, or small clusters of birthday candles.

Comments

[lilchumy]

How exactly dose this work?

[Kiteman]

It's the deflection of convection currents - see step four.

[Jessierocks]

THANK YOU SOOOOOOOOOOOOO MUCH!!!!!! I'm doing this in school for science and I'm happy I went on this website instead of just youtube!!! :D

[Kiteman]

You're welcome - remember, it's really important to stop all draughts in the area.

[makerboy112]

How on Earth do you think of this stuff?

[Kiteman]

I paid attention at school - this is a logical (but not very useful!) combination of heat transfer (convection) and Newtonian mechanics (action and reaction).

Science+imagination=Instructables.

[80$man]

Genius! I enjoyed this very much, good work! I have two comments:
Firstly, Newtonian mechanics (physics) coupled with fluid buoyancy effects (Archimedes) is causing the propultion. Convective heat transfer only causes fluid buoyancy (of the air) which has an action/reaction with the sail.
Secondly, could you consider rather funnelling the hot air into a converging tube that draws air under the boat allows the hot air to push against the water? This should provide a serious increase in propulsion! I have seen such a tube made from a hollow kettle element, but a crimped copper tube should suffice. Any thoughts on such improvements?

[Kiteman]

I haven't re-visited this project in a couple of years - feel free to use it as the basis of your own, improved fire-boat.

[simplebotics]

well when i saw the picture i automatically figured out how it worked

[ParacordJedi]

Oh dang, you're a cool kid now :O

[TheRacker]

Same.

[makerboy112]

 Ahhh....I have a great imagination. Maybe I'll start paying attention now...

[ilpug]

I think it would look just great if one made a ton of these and let them loose on a pond or pool at night. As long as they cleaned up afterwards of course.

[merseyless]

i made on of these with the top of a jam jar and my homemade ultra candle! i put it in the kitchen sink and tried it out it worked ok and i only stopped it when the fuel in the candle started to boil and shot bits of it everywhere so i had a fireball in the sink with my alfoil starting to disintergrate. so i blew it out and decided never to use the candle again. lol good times... good times...

[Frindledon3]

what super candle??? if its different from a rglar candle you should put it on this website

[merseyless]

homemade candle... but the fuel caught on fire and boiled... not the best thing to have in you're sink.

[wakojako]

http://sci-toys.com/scitoys/scitoys/thermo/thermo.html#boat

[wakojako]

http://www.instructables.com/id/Pop-pop-or-put-put-steamboat-made-easy-for-childre/?ALLSTEPS

[knektek]

you could have a weight on one side, that will make the boat move, instead of using those 'ugly' sails, apart from that GREAT design!

[Kiteman]

If you read it, the sails are the whole point...

[panzer]

OMG *light goes on above head* i've got an idea!!!!!!!!! OMG

i will post my idea soooon, cuz u gave me the best idea ever!!!!! and i have everything that is needed, cause its so simple, YES!!!!!! ha ha, thanks

greatttt instructable!

[Kiteman]

You're welcome.

_{Drop me a PM when you post it...}

[panzer]

what's a PM???? sorry, i'm new to this....

[Kiteman]

PM = Private Message.

Click on a member's name, and you will go to their member space.

On the left, you will see their avatar, with a button beneath, "private message me". Use that to send messages you don't want to be seen by the rest of the site.

[panzer]

alright then, i don't know when i'll have it by, but prolly sometime this week!

[Frindledon3]

give me a heads up too

[Kiteman]

Cool, I look forward to it.

[rooster1998]

me too!

[maurice1993]

hey! salutations for you all! I am new round here, ain't two weeks I visit this site, and this site it's incredible!!! One classamate mine has a idea almost similar, he use a soda can, made a few holes by the base, and in the top, he put two empty pens, and this pens to the rear end of the boat, under the water, and he use about three candles to made the fire. this isn't a convectional boat too? as the fire heat up the air into the canister, these hot air flow to the pens to outside the boat, creating the same efect? and that pop-pop-pop, yeap, the steam engine. (may the project of my classmate was a fusion of this two, like an hibrid?) sorry if my english is so poor, I'm still learning these language, I live in brasil :P

[Kiteman]

That sounds interesting. Maybe a photo?

[zoltzerino]

I'm not quite sure what maurice1993 was trying to say, but the "pop-pop-pop" reminded me of 'pop-pop' boats. Have you ever heard of them? If so could you explain how they work for me please? ZZZZ

[Kiteman]

Put briefly, the candle's heat boils a small volume of water and squirts it out the back. The steam hits the cold water outside the boat and condenses, which pulls water back into the boiler. The repeating cycle drives the boat and makes the pop-pop sound.

[zoltzerino]

Yep, sounds like a pop pop to me... ZZZZ

[maurice1993]

I don't have a photo because isn't my project, and the times from their science fair, I do not had a camera... but I can try to make one to share.

[chemy999]

like this?

http://sci-toys.com/scitoys/scitoys/thermo/thermo.html#boat

you will need to scroll way down the page but is that the general concept?

[maurice1993]

yeah, it's like that boat with the candle inside, but, when that boat have a elevation in the top, my matte's boat had a tube(like a pen) to irect the hot air flow to the end bottom of the boat... under the water...

[thepelton]

I recall seeing a boat that you could make when I was a child that involved a candle and a copper tube attached to a piece of wood.

[junits15]

build like a giant fire in the tin and watch it rocket accross (if the tinfoil dosnt melt first! XD

[DrCoolSanta]

Tin foil melts even with a lighter . . .

[junits15]

i know it looks so cool when it is red hot!