Welcome to Laser Pointer Forums! If you are looking for a laser you may want to check out the database of laser pointer companies. The link will open in a new window for your convenience.

 Laser Pointer Forums - Discuss Laser Pointers EM drive which could allow us to reach marks in 70 days. Laser Pointer Company Database     Laser Top Sites List     Lasers by Type     Green Lasers

10-22-2015, 05:32 PM #1
 Class 3B Laser Join Date: Jan 2014 Location: Near Mosul, Iraq Posts: 4,254 Rep Power: 2090
Class 3B Laser

Join Date: Jan 2014
Location: Near Mosul, Iraq
Posts: 4,254
Rep Power: 2090
EM drive which could allow us to reach marks in 70 days.

__________________

http://www.lexellaser.com/techinfo_wavelengths.htm

Laser Safety:
http://www.laserpointersafety.com/index.html

Angular Size Calculator; use with diode angle of radiation specification to calculate the needed lens diameter for a given FL:
http://www.1728.org/angsize.htm

Divergence to spot size calculator: http://tinyurl.com/spotsize - 1 mRad is about .057 degrees which from the earth would expand to be ~10% the diameters of the moon or sun at their distances.

Divergence Calculator: http://www.pseudonomen.com/lasers/ca...alculator.html - Measure your lasers beamwidth at 1 foot & then at a further distance to calculate the divergence.

Online calculator to determine spot intensity at different mRad's & powers @ distances: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: http://www.ophiropt.com/laser-measur...ity-calculator

How to build a laser beam expander to reduce divergence: http://tinyurl.com/BeamExpander

RHD's Relative Perceived Brightness Calculator. Compare brightness @nm: http://lsrtools.1apps.com/relativebrightness

YAG Power Calculator, i.e. convert ns @ mJ to peak power in watts http://tinyurl.com/YAG-Pulse

The forum costs more to run than donations received, if you wish to help click this link: http://laserpointerforums.com/donations.htm

_______

10-22-2015, 08:14 PM #2
 Class 3B Laser Join Date: Jul 2015 Location: Suburbs of Atlanta Georgia Posts: 3,669 Rep Power: 2103
RedCowboy
Class 3B Laser

Join Date: Jul 2015
Location: Suburbs of Atlanta Georgia
Posts: 3,669
Rep Power: 2103
Re: EM drive which could allow us to reach marks in 70 days.

Did you know that NASA said it was impossible until the Chinese built one, then NASA built one that's not as strong but proves it works.
http://www.wired.co.uk/news/archive/...nd-cold-fusion

Last edited by RedCowboy; 10-22-2015 at 08:18 PM.

11-01-2015, 01:15 AM #3
 Class 2M Laser Join Date: Dec 2012 Location: U.S. MI Posts: 630 Rep Power: 502
Mattronium
Class 2M Laser

Join Date: Dec 2012
Location: U.S. MI
Posts: 630
Rep Power: 502
Re: EM drive which could allow us to reach marks in 70 days.

According to this article: Here's why scientists haven't invented an impossible space engine ? despite what you may have read, it still might not be rigorously proven to actually work.

Could someone point out an article that actually talks about the science of it in depth. I'd be super awesome it it was true, I'd just like to see the proof.

Hopefully it's not just the media making a big story when it's not really there.
__________________
"SAFETY FIRST, LAST AND ALWAYS" ~ Pman
Laser Safety Information

Noteworthy Lasers and λ's:
685nm: 24mW pointer pen
660nm: 230mW LPC-826
647.1nm: Omnichrome 643 air cooled Ar/Kr ion 5-line max (high hours)
638nm: 600mW Kryton Groove
635nm: 5.8mW DIY pointer pen 0.6mrad
632.8nm: 20mW HeNe SP-107 - 6mW Hughes 3225H-C made in 1980.
594.1nm: 4.1mW Coherent HeNe from Sigurthr - 1.7mW HeNe REO-LHYR-0050M
568.2nm: Ar/Kr
550nm: multi-line DPSS +/- 1nm
545nm: multi-line DPSS +/- 1nm
543.5nm: 3.1mW Coherent HeNe - 1 mW MG HeNe
542nm: multi-line DPSS
537nm: multi-line DPSS
532nm: 500mw CNI PGL-III-C, 2*Pman laser builds: 20mW & 50mW (One displaying 6-lines)
515nm: 36mW laserBtB
514.5nm: 2214-40MLA Argon Ion
501.7nm: Argon line
496.5nm: Argon line
488.0nm: Argon line
476.5nm: Argon line
462nm: 2W M462 Kryton Groove
457.9nm: Argon line
450nm: 94mW laserBtB
445nm: 2.5W NDB7875 Kryton Groove - 40mW Pen laser using NDB7242E diode
405nm: 100mW PHR-805T

Building: 337.1nm: TEA laser

"Fiat Lux" - preferably laser light.

Last edited by Mattronium; 11-01-2015 at 01:16 AM.

11-01-2015, 01:21 PM #4
 Class 3B Laser Join Date: May 2013 Location: Snohomish County Washington, US Posts: 3,800 Rep Power: 1086
Pi R Squared
Class 3B Laser

Join Date: May 2013
Location: Snohomish County Washington, US
Posts: 3,800
Rep Power: 1086
Re: EM drive which could allow us to reach marks in 70 days.

This has been discussed in three other threads, it's probably a good idea to have this one thread for this topic since something big may come of it. I read that it was first tested in the U.K. and then later in China, and NASA tested it in a vacuum. They all showed it has thrust, so there is something to it. The astronomer Richard C. Hoagland who has a nighttime radio show 2 hours M-F has done 2 shows with a guy here in the U.S. who built one at home. This guy replaced the copper chamber with just copper screen, and he used a tube from a microwave oven and it produces a tiny amount of thrust, he is trying to raise several thousand dollars for more thorough testing. Someone needs to test one of these in space. I am guessing the Chinese might do that first. Keep in mind that even though the engine doesn't burn fuel, it really does burn fuel because it needs electricity to power it, lots of electricity for lots of thrust. They are talking about needing nuclear reactors like we use on Navy ships to be able to build interplanetary ships that can go fast.

Alan
__________________
Keychain 650nm <5mW
Quartet 4-in-1 630-680nm <1mW

AtlasNova 635nm <5mW
MillionAccessories 532nm <5mW broken
M462 462nm one of a kind (in progress)
PLTB450B 450nm 1913mW G2 lens
PL520 520nm 82mW acrylic lens
S06J 12X 405nm 590mW G2 lens
C6 M140 445nm 1.5W 3 element lens
9mm 445nm with G2 lens in a stainless steel host
Radiant Electronics X4 3.7W Laser Power Meter

___________________________________________
The light that shines twice as bright burns half as long.

11-01-2015, 01:46 PM #5
 Class 3R Laser Join Date: Apr 2014 Location: NJ Posts: 1,296 Rep Power: 173
Teej
Class 3R Laser

Join Date: Apr 2014
Location: NJ
Posts: 1,296
Rep Power: 173
Re: EM drive which could allow us to reach marks in 70 days.

I think the point of the interplanetary version of the EM drive is that it WON'T require a lot of electricity to run.......in its final form.

This sort of science fiction-ish level technology, such as the ion drive that WAS used to go out past Pluto, etc, that starts off as impossible, ends up being old hat that gets replaced by the next breakthrough.

Very cool stuff.

11-01-2015, 06:06 PM #6
 Class 3B Laser Join Date: May 2013 Location: Snohomish County Washington, US Posts: 3,800 Rep Power: 1086
Pi R Squared
Class 3B Laser

Join Date: May 2013
Location: Snohomish County Washington, US
Posts: 3,800
Rep Power: 1086
Re: EM drive which could allow us to reach marks in 70 days.

Quote:
 Originally Posted by Teej I think the point of the interplanetary version of the EM drive is that it WON'T require a lot of electricity to run.......in its final form. This sort of science fiction-ish level technology, such as the ion drive that WAS used to go out past Pluto, etc, that starts off as impossible, ends up being old hat that gets replaced by the next breakthrough. Very cool stuff.
Yes very cool stuff. The ion drive also has hardly any thrust, so it takes years for it to reach a reasonable speed, it took 9 years to get to Pluto. If I remember right, theoreticaly they can make them capable of reaching 1/10th the speed of light, but the thrust is so small that it would take too long to reach that speed.

The EM drive may not require a lot of power for a small unmanned probe if you're not in a hurry, but for larger spacecraft it will, it is still converting one type of energy into another. I expect the increase in power required for a larger spacecraft would not be linear with the increase in the mass of a spacecraft, it would likely be proportional to the square of the increase of mass of the spacecraft. For a large manned spacecraft this would require a huge amount of power, even small nuclear reactors may not be adequate. In any case it appears that a new discovery has been made, but just what, remains to be seen, more testing needs to be done.

Alan
__________________
Keychain 650nm <5mW
Quartet 4-in-1 630-680nm <1mW

AtlasNova 635nm <5mW
MillionAccessories 532nm <5mW broken
M462 462nm one of a kind (in progress)
PLTB450B 450nm 1913mW G2 lens
PL520 520nm 82mW acrylic lens
S06J 12X 405nm 590mW G2 lens
C6 M140 445nm 1.5W 3 element lens
9mm 445nm with G2 lens in a stainless steel host
Radiant Electronics X4 3.7W Laser Power Meter

___________________________________________
The light that shines twice as bright burns half as long.

11-03-2015, 10:05 PM #7
 Class 2M Laser Join Date: Oct 2013 Location: NewBrunswick, Canada Posts: 896 Rep Power: 325
Blarg King
Class 2M Laser

Join Date: Oct 2013
Posts: 896
Rep Power: 325
Re: EM drive which could allow us to reach marks in 70 days.

Still, if a small, low powered version was proven to be functional, it would be useful for counteracting the small amount of drag lower orbit satellites and stations experience.
__________________
405- 45 mW ebay pen
405- 90 mW ebay laser Deceased (Caught fire???)
445- 1.7 Watt Blord 501B
473- 10 mW B&W Tek Labby

520- 150 mW LaserBTB HL520
532- 40 mW ebay pen
532- 80 mW WickedLasers Fusion
532- 220 mW SkyLasers
638- 180 mW 501B

638- 5 mW LaserGlow Libra
633- 1 mW Uniphase Novette HeNe
638- 1 mW (?) HeNe Tube
650- 5 mW ebay pen
980- 60 mW ebay pen

11-04-2015, 01:11 AM #8
 Class 3R Laser Join Date: Apr 2014 Location: NJ Posts: 1,296 Rep Power: 173
Teej
Class 3R Laser

Join Date: Apr 2014
Location: NJ
Posts: 1,296
Rep Power: 173
Re: EM drive which could allow us to reach marks in 70 days.

Absolutely, the ion drive is a lot stronger than a photon drive, but this new technology is a LOT stronger than the ion drive.

Its akin to really tall gearing on your 10 speed bike....hell to get going, but you can go really fast when its up to speed.

If scaled up, this could do what the ion drive could only dream of.

I think the biggest difference might be the potential one day for gravitational escape power with this drive. Right now, IIRC, they are at a theoretical ~ 1 ton thrust per kW.......very nice potential....

....assuming the entire thrust is not due to experimental error, as with the never ending cold fusion experiments, etc

>

Last edited by Teej; 11-04-2015 at 03:06 AM.

11-04-2015, 01:28 AM #9
 Class 3B Laser Join Date: May 2013 Location: Snohomish County Washington, US Posts: 3,800 Rep Power: 1086
Pi R Squared
Class 3B Laser

Join Date: May 2013
Location: Snohomish County Washington, US
Posts: 3,800
Rep Power: 1086
Re: EM drive which could allow us to reach marks in 70 days.

Quote:
 Originally Posted by Blarg King Still, if a small, low powered version was proven to be functional, it would be useful for counteracting the small amount of drag lower orbit satellites and stations experience.
That would be great if that worked without much power, maybe it would work with just solar power.

Quote:
 Originally Posted by Teej Absolutely, the ion drive is a lot stronger than a photon drive, but this new technology is a LOT stronger than the ion drive. Its akin to really tall gearing on your 10 speed bike....hell to get going, but you can go really fast when its up to speed. If scaled up, this could do what the ion drive could only dream of. I think the biggest difference might be the potential one day for gravitational escape power with this drive. Right now, IIRC, they are at a theoretical ~ 1 ton thrust per kW.......very nice potential.
If they can get it to be that efficient then that should do the job. Here is another article I read this morning:

Yahoo!

Alan
__________________
Keychain 650nm <5mW
Quartet 4-in-1 630-680nm <1mW

AtlasNova 635nm <5mW
MillionAccessories 532nm <5mW broken
M462 462nm one of a kind (in progress)
PLTB450B 450nm 1913mW G2 lens
PL520 520nm 82mW acrylic lens
S06J 12X 405nm 590mW G2 lens
C6 M140 445nm 1.5W 3 element lens
9mm 445nm with G2 lens in a stainless steel host
Radiant Electronics X4 3.7W Laser Power Meter

___________________________________________
The light that shines twice as bright burns half as long.

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

All times are GMT. The time now is 08:29 AM.

 -- DarkShadows V5 -- Responsive LPF -2562016 -- Default Style Contact Us - Laser Pointer Forums - Archive - Top