| Author |
Message
|
| Mikasauras |
 Posted: Thu Mar 04, 2010 6:39 pm Post subject: Magnetic motor for airplane |
 |
|
Forum Freshman
Joined: 04 Mar 2010
Posts: 8
Location: Brunswick, OH
|
| I had a thought of building an airplane and was thinking of using magnetic force to spin the propeller blades. I have thought of about two ways of making them spin, 1 being place magnets around the drive shaft and having another set of magnets and have their poles be N and N facing each other to make it spin. I would like to think that somewhere there are magnets strong enough to do that, so I have come here to ask if those exist, but now my second theory, I'm not even sure it could work seeing as I am inexperienced in magnetic force and how it acts. 2. Is to have a magnetic force generated by electricity around my solid magnets and therefore making it spin but I have no clue as to what the 2nd option will do I would think that I would need a massive amount of electricity to make a magnetic field that would be powerful enough to provide liftoff of an airplane. But if this is doable then why wouldn't people have already done it I think to myself, people are probably doing it and I just haven't heard about it. Thank you |
|
| Back to top |
|
 |
| Harold14370 |
| Posted: Thu Mar 04, 2010 6:49 pm Post subject: |
|
|
Moderator
Joined: 13 Apr 2007
Posts: 3061
Location: Pennsylvania
|
| What you are describing is called an "electric motor." It is not practical for propelling an airplane because the storage battery would be too heavy. |
|
| Back to top |
|
|
| DrRocket |
| Posted: Thu Mar 04, 2010 6:50 pm Post subject: |
|
|
Forum Radioactive Isotope
Joined: 12 Aug 2008
Posts: 3114
|
| Harold14370 wrote: |
| What you are describing is called an "electric motor." It is not practical for propelling an airplane because the storage battery would be too heavy. |
Precisely |
|
| Back to top |
|
|
| Mikasauras |
| Posted: Thu Mar 04, 2010 7:24 pm Post subject: |
|
|
Forum Freshman
Joined: 04 Mar 2010
Posts: 8
Location: Brunswick, OH
|
| Wow that was fast thank you, all for your input so in conclusion the engine would not be able to produce enough power without a massive amount of power perhaps a generator on board? |
|
| Back to top |
|
|
| Mikasauras |
| Posted: Thu Mar 04, 2010 7:30 pm Post subject: |
|
|
Forum Freshman
Joined: 04 Mar 2010
Posts: 8
Location: Brunswick, OH
|
| I mainly know of these items ie. electric motor and generator but have no knowledge of the output of electric units they produce on a scale in my mind. |
|
| Back to top |
|
|
| Waveman28 |
| Posted: Thu Mar 04, 2010 9:25 pm Post subject: |
|
|
Forum Senior
Joined: 04 Mar 2009
Posts: 336
Location: Australia
|
| DrRocket wrote: |
| Harold14370 wrote: |
| What you are describing is called an "electric motor." It is not practical for propelling an airplane because the storage battery would be too heavy. |
Precisely |
Not necessarily. You could use Superconducting Magnetic Energy Storage (SMES). Such devices have a huge energy storage density.
_________________
"Doubt is the origin of Wisdom" - Rene Descartes |
|
| Back to top |
|
|
| MagiMaster |
| Posted: Thu Mar 04, 2010 9:45 pm Post subject: |
|
|
Forum Professor
Joined: 16 Jul 2006
Posts: 1867
|
I'm not sure I'd want to be sitting next to a tank of liquid nitrogen and 10000 feet, but that may just be me.  |
|
| Back to top |
|
|
| Harold14370 |
| Posted: Fri Mar 05, 2010 3:15 am Post subject: |
|
|
Moderator
Joined: 13 Apr 2007
Posts: 3061
Location: Pennsylvania
|
| Mikasauras wrote: |
| Wow that was fast thank you, all for your input so in conclusion the engine would not be able to produce enough power without a massive amount of power perhaps a generator on board? |
A generator wouldn't be much use in that situation. A generator changes mechanical energy into electrical energy. You want to end up with mechanical energy to turn the propellers. |
|
| Back to top |
|
|
| Ghrasp |
| Posted: Fri Mar 05, 2010 4:17 am Post subject: |
|
|
Forum Senior
Joined: 06 Dec 2006
Posts: 321
Location: Netherlands
|
Maybe you could build something like this
http://www.youtube.com/watch?v=z8qvSNkiB9M&feature=related
(even if it wouldn,t be an over-unity device it still could have a high enough rendition as an electric motor and as it seems to have an electron flow from the outside to the inside it could also be made working on a battery I suppose. |
|
| Back to top |
|
|
| Scifor Refugee |
| Posted: Fri Mar 05, 2010 8:01 am Post subject: |
|
|
Forum Professor
Joined: 02 May 2005
Posts: 1885
|
| Waveman28 wrote: |
Not necessarily. You could use Superconducting Magnetic Energy Storage (SMES). Such devices have a huge energy storage density. |
So far as I know, these are very, very heavy. Their energy density is very good in terms of energy/volume, but the energy/mass ratio is terrible. They are usually used on the ground, where no one cares how much they weigh because you never have to move them. |
|
| Back to top |
|
|
| DrRocket |
| Posted: Fri Mar 05, 2010 9:13 am Post subject: |
|
|
Forum Radioactive Isotope
Joined: 12 Aug 2008
Posts: 3114
|
| Harold14370 wrote: |
| Mikasauras wrote: |
| Wow that was fast thank you, all for your input so in conclusion the engine would not be able to produce enough power without a massive amount of power perhaps a generator on board? |
A generator wouldn't be much use in that situation. A generator changes mechanical energy into electrical energy. You want to end up with mechanical energy to turn the propellers. |
That is the system used in some railroad engines (diesel electric), a motor-generator set. They produce lots of torque, but don't fly very well. |
|
| Back to top |
|
|
| Mikasauras |
| Posted: Fri Mar 05, 2010 9:48 am Post subject: |
|
|
Forum Freshman
Joined: 04 Mar 2010
Posts: 8
Location: Brunswick, OH
|
| I probably should have stated as to what size this craft would be, wouldn't be very large. 450-500 Lbs. The video linked by Ghrasp seems very interesting but would it be effective at moving such a large object. without consuming lots of power which would then lead to the same problem of energy:weight ratio. Could I take the same idea as to how a car is powered and use an alternator/battery combo to power this S.E.G.? |
|
| Back to top |
|
|
| DrRocket |
| Posted: Fri Mar 05, 2010 11:06 am Post subject: |
|
|
Forum Radioactive Isotope
Joined: 12 Aug 2008
Posts: 3114
|
| Mikasauras wrote: |
| I probably should have stated as to what size this craft would be, wouldn't be very large. 450-500 Lbs. The video linked by Ghrasp seems very interesting but would it be effective at moving such a large object. without consuming lots of power which would then lead to the same problem of energy:weight ratio. Could I take the same idea as to how a car is powered and use an alternator/battery combo to power this S.E.G.? |
A car uses the gas or diesel motor as the prime mover. That is not particularly efficient and cars are not nearly as weight-sensitive as aircraft. Your idea is inherently heavy.
For an aircraft you need favorable thrust/drag and lift/weight ratios, that puts a premium on minimizing weight.
You can safely ignore Ghrasp if you are serious. His next accurate and germane post will be his first. Brushless DC motors have many applications, including in the aerospace industry. Propulsion is not one of those applications. |
|
| Back to top |
|
|
| Mikasauras |
| Posted: Fri Mar 05, 2010 11:50 am Post subject: |
|
|
Forum Freshman
Joined: 04 Mar 2010
Posts: 8
Location: Brunswick, OH
|
| Could I make the airplane out of Nylon not just Nylon obviously I would have to make a frame to put it around, but problems with strength and mounting my wings and landing gear any suggestions? It would seem as if this will be nearly impossible. |
|
| Back to top |
|
|
| MagiMaster |
| Posted: Fri Mar 05, 2010 12:18 pm Post subject: |
|
|
Forum Professor
Joined: 16 Jul 2006
Posts: 1867
|
| Most personal aircraft that I know of are made from cloth stretched over a frame; however, I don't know what kind of cloth they use. |
|
| Back to top |
|
|
|
|
