# 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

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

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

Topic by Jayefuu    |  last reply