Search for propellor in Topics


Hand powered boat propellor? Answered

I am trying to build a boat for a physics project, and i wanted to try building one that used a propellor instead of the usual paddlewheel or oars that other students have used.  I bought a 2-blade trolling propellor from Walmart, and i plan on attaching it to a crankshaft via a 4:1 belt drive ratio (so with every rotation of the crankshaft, the propellor spins 4 times). Two people will be turning the crankshaft , and the boat itself is stocky with a flat bottom and pointed end. Is this even possible, and will it actually get the boat to move at a reasonable speed? ("Reasonable" meaning rowboat-ish speed)  I included a quick sketch of what im talking about, and a picture of the blueprints to the civil war submarine that I got the idea from, just for proof of concept. 

Question by masterbuilder    |  last reply


Propeller name problem?

I'm looking for a small (2 inch) propeller for a toy, but all the sizings are like 4x6, or 6x8 etc. What do these 2 numbers mean. Also some propellers say EP-____ what does this mean and finally most say 120mm x 110mm, (example) but no way do these mean that the propellers are almost square. Thank you

Question by alexw2150  


Quadropropellor concept

Last night I had this dream about a bizarre helicopter that used a simple but unique form of a propeller.  Conceptually, I see no reason why it should not work... but I'm not sure if it would be any better or more efficient than a typical propeller.  The idea is that the geared propellers rotate at the tips of the main rotor as it spins.  The outside ring is fixed such that as the central propeller spins, each of the out side disc spin creating lift from both the central propeller as well as each of the four outside propellers.  Because the geared wheels will spin faster than the central rotor, theoretically it might produce more lift than a single propeller (maybe).  I would like to hear other people's thoughts on the concept.  If someone has a 3D printer, it should be relatively simple to make and test.

Topic by DarkRubyMoon    |  last reply


can i change my 6 spline propellor shaft on my outboard to a 10 spline?

I have a 1978 suzuki dt25 outboard which is running a 6 spline/key way propellor shaft. since a 6 spline propellor is incredibly hard to find these days could i replace that shaft with a 10 spline shaft which is more common? cheers. william horton

Question by billbobaggens    |  last reply


How do i get started using a propellor chip or PIC chip? Answered

I always see really cool things people make with propellor and pic chips but i never knew where to start. And what are some pro's and con's of propellor vs pic chips. Ive done alot of research but i wasnt sure so i figured i would ask people who know. All help appreciated :D

Question by BanterBanter1066    |  last reply


gyroscopic frisbee helicopter

A helicopter mainly made up of a frisbee rotating at very high speeds, along with a propellor underneath, and steering propellors.

Topic by jid4611    |  last reply


Complex whirligig?

I want to build a 7 propellor whirligig, but theres one catch. Each propeller sopins in the opposite direction from the one before it.Simple enough, Except for one catch. I want all of the propellers to be conected to a central shaft. I think I've figured a way to do it , but it may not be the most efficient way. If you don't have an idea for how to get it done, here is another question.The way I've figured, the propellors "float" abover the gears, but that way they will fall off. Any ideas for securing the propellors for minimum friction?

Question by RGoI    |  last reply


How do you wire a timer and relay to 19.2v drill and 12v battery?

 Can anyone help me please. I am trying to wire an electronic timer with relay to a cordless drill (19.2v) and 12v battery, and am not having much luck.  It is for my kontiki - the drill runs the propellor.  Many thanks.

Question by billpic    |  last reply


Autogyro construction tips, please!!!

Hey i would like to get some tips on my autogyro which i plan to build...    a) Rotor shape & size    b) Engine power (and power source) and engine propellor shape & size    c) Materials to be used in construction (durable, cheap)    d) Approximate size P.S. I weigh around 345 Newtons...

Question by hqdiyexplorer    |  last reply


I want to know if it is possible for one or two ducted fans to lift a person off of the ground? Answered

I know it's a crazy and outlandish thought, but I've always wondered if it's possible. I know the Mythbusters tried it with the plans from Futurehorizons.net and failed but Is there a way to fix the problems and make the 'fan-pack' work? Maybe not even in a 'fan-pack' but maybe more of a VTOL type vehicle, but not so complex as the Moller SkyCar. Like the Mythbusters explored, I would want something that the 'average Joe' could create. If anybody has any ideas or even guidance on how to do it, such as hp of an engine, rpm's what to make the ducts and propellors from etc, then I would really love to know what everybody thinks. Thanks, Jack

Question by JackIsted    |  last reply


Quiet Hovercraft?

Long-time lurker, first-time poster. I very much enjoy this community of happily-twisted imagineers & feel strangely at home when I visit. Been toying with an idea & need some outside-the-box thinkers. One primary issue with recreational hovercraft design is propellor noise. Could a blade-free ("Dyson-ring") fan design be adapted to a hovercraft application? By ducting the required volume & pressure of air into the ring the primary source of noise is...gone. Safety would be vastly improved, eliminating the need (and weight) for protective screening. Fewer mechanical parts also means the craft becomes cheaper/lighter.  And if, rather than one large ring, two smaller rings were swivel-mounted they could further simplify the steering (directional thrust) and give the hovercraft another very unique feature. By quickly counter-reversing the two rings 180 degrees, the hovercraft would have BRAKES! I've never seen a recreational hovercraft with the ability to stop quickly (with the obvious exception of crashing into a large, heavy object!). All input is appreciated. Thanks very much!       

Topic by Ghost Tracker    |  last reply


K'nex Challenge 2: 18th Sept - 11th Oct - FLIGHT

After the success of the last contest, Gmjhowe, =SMART= and myself decided we'd go for it and launch a second contest.The first we really enjoyed and saw some awesome entries. This time we've decided to make the guidelines a wee bit looser so you can use your imagination more. We'll be setting a category for you to design and build within and then provide you with some example ideas to get you started. And this category is....FLIGHTAnything plane, helicopter, glider, flight related is allowed. Please read the rules carefully.Rules:Your entry must do something. It can't just be a model of a plane or a helicopter. We want them to move or glide or have spinning parts or be functional for something else around the house but be aircraft themed.Entries must be over 50% knex. The remaining can be paper, glue, card, tissue paper.... anything!To enter, write up a full instructable of your construction process with clear pictures and descriptions. Post the link here.Please steer clear of guns. That's not what this is about.Starting and closing dates are GMT.What the judges say goes!Have fun!Judging - 12th Sept - 18th SeptSuggestions:A propellor. Small and compact, if you design a good one you might get extra kudos if your design's then used in loads of other entries.A ceiling plane. With a plastic propeller on the front and the top attached to a string to the ceiling, this plane will fly itself around in circles on a string.Paper plane launcher. Probably the closest you'll get to a gun.A vertical launch rocket. Rocket being a rocket model not a meagre collection of rods.While knex by itself might not be light enough to fly.... perhaps you could run some string through the middle to make it appear to glide.... Mum's washing line might be of great help.Prizes:There will be patches for prizes. Gmjhowe will be uploading them soon.

Topic by Jayefuu    |  last reply


"Ride" by Michael Cooper - My Favorite Thing From the Maker Faire

This was, by far, my favorite thing at the 2008 Maker Faire. From Make's Description:Ride is a custom single rider helicopter with eight engines conceived & created by sculptor, Michael Cooper. It looks like more like a time machine invented by Dr. Seuss for George Jetson than anything you've seen in the air (or on land) recently.Michael Cooper is a sculptor who combines wood, metal, kinetics and mechanics with a twisted imagination resulting in beautiful, unique works of art that roll, spin, hop, contort and make people laugh while simultaneously scratching their heads. After 34 years as an art instructor at Foothill and DeAnza Colleges, he has now "retired" to his studio in Sebastopol where he spends his days devoted to sculpting, inventing and pushing the boundaries of form and function with a heavy does of humor.I know the pictures don't do it justice, and it's really hard to see everything, but take a long look and answer this question before you continue: Do you think it does/could fly? (Scroll down below the line and look at the pictures.)... did you look at the pictures first?There are so many reasons why it can't fly that I won't bother to discuss them here. However, the truly fascinating thing I liked so much was standing around Ride and listening to the conversations, and particularly watching its creator stage-manage the discussion. Lots of people wanted to discuss why they thought it could or couldn't fly - remember that this was the Maker Faire, so lots people here were builders or tinkerers (or at least thought of themselves as such). There were half-hour long heated debates about the tiniest of minutiae -- fuel line diameters and spiral exhaust ports, for example.Periodically, someone would gain the courage to think about the system as a whole and would approach the creator to ask, "So it flies, right?" He'd answer truthfully enough by saying, "Well, it's not done yet," and then launch into a detail, like the difficulty in synchronizing 8 engines; this would get the whole group rolling again. Later Saturday evening, when most of the kids had gone home and everyone else was outside listening to a band, a group of particularly crotchety old tinkerer-types were showing off their smarts and trying to outwit each other. After one onlooker had finished with his unnecessarily loud pronouncement of "based on my extensive experience building 1/6th-scale steam locomotive engines, I absolutely sure it can fly," another of the group tentatively approached the creator, and asked the inevitable question.Michael Cooper took his cue, dodged, and redirected into a discussion of how the transmission linking the 8 engines to the propellor was open, and the first time he ran it, he was probably going to get covered in grease. I burst out laughing.After they were all rolling again on how many cubic feet of compressed air the vehicle should optimally carry for its four pneumatic lifter feet, I quietly asked Michael how many people "got it" and how many people asked if it could fly. He confided that I was very much in the minority. Further, he got a big kick out of removing his name tag, and listening in to the can-it-fly conversations, too.I really hope I get a change one day to work with Michael Cooper to design and build a gorgeous Ride-like vehicle for me, so I get the chance to answer the question, "So, does it really fly?"

Topic by ewilhelm    |  last reply