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EM Rockets Launched! Video!!

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LAN_403

FastMHz

Sun Jun 11 2006, 05:34PM

Registered Member #179 Joined: Thu Feb 16 2006, 02:08AM
Location: Hagerstown, Maryland - Close to Prime Outlets
Posts: 287

I launched my electromagnetic rockets "EMRockets" a short while ago and just finished editing together the footage. The footage shows induction launched rockets at progressively higher voltages...the higher the voltage, the more altitude, but also the more Gs, and therefore the rockets get destroyed

It's back to the drawing board to build a rocket that can withstand more than one full power launch...

Rocket Launching

joshua_

Sun Jun 11 2006, 07:02PM

Registered Member #61 Joined: Thu Feb 09 2006, 05:50AM
Location: Mountain View, CA
Posts: 43

Neat! I saw that you got the true-to-form "four fins on the launch pad" afterwards :)

Very very cool.

Marko

Sun Jun 11 2006, 08:47PM

Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145

Maybe you could make a rocket with engine that activates when rocket begins to 'fall' and continues proppeling

I guess you'l need to make bases of rockets tougher, tough.

Quantum Singularity

Mon Jun 12 2006, 05:09PM

Registered Member #158 Joined: Sun Feb 12 2006, 09:53PM
Location: Central Ohio
Posts: 282

Looking good! Thanks for capturing the excitement on video and sharing with us! What software do you use to make your videos... yours always come out pretty good. To bad you couldnt get the rocket to show up against the sky when it launches on the zoomed-out video... wonder if you painted it black or something... but still I think the sky pretty much will wash anything small out.

FastMHz

Tue Jun 13 2006, 11:50PM

Registered Member #179 Joined: Thu Feb 16 2006, 02:08AM
Location: Hagerstown, Maryland - Close to Prime Outlets
Posts: 287

I use Premiere for my videos..and yes, it's a legal copy

You can actually follow the rocket off the frame in my original source video but WMV distorts it enough to make it disappear

I'll spray paint the next ones with neon paint. BTW, those were all launched from a 12v 5ah battery!

Self Defenestrate

Wed Jun 14 2006, 01:30AM

Registered Member #87 Joined: Thu Feb 09 2006, 01:36PM
Location: San Jose
Posts: 191

As for the idea of strapping an engine to it, a mercury switch would work well. As the rocket slows down and reaches apogee, the mercury will fly up and complete a circuit to fire an engine. Common practice when staging engines electricly. Cool video, and may I suggest day-glo orange, shows up well in bright skys.

Jasonr

Wed Jun 14 2006, 05:18PM

Registered Member #167 Joined: Mon Feb 13 2006, 06:41PM
Location: Waterloo, WI
Posts: 54

Nice project, any idea how high they are going? What ga magnet wire are you using? and how many turns? I see it is a dual layer coil?

nice scr's! btw

Jason

FastMHz

Thu Jun 15 2006, 05:29PM

Registered Member #179 Joined: Thu Feb 16 2006, 02:08AM
Location: Hagerstown, Maryland - Close to Prime Outlets
Posts: 287

Unfortunately I don't know how high they're going...I need an altimeter, though I suppose I could listen carefully and time the launch until crashdown to estimate the height....what would the formula for that be?

The wire is 14awg magnet wire...same stuff used in all my other CGs and launchers. The only difference is that this coil is only 2.5" in diameter, instead of 3.5"....don't know how many turns...I just wrapped it until it was the right diameter as I built the coil for the aluminum slugs I'm using, which are 2.5" diameter and 3/8" thick. It is a dual layer coil, though I think I'm going to make a 3 layer one as the current is vaporizing the solder before I can fire the bank at full capacity. My 3.5" diameter DL coils had each layer in parallel...this smaller one has them in series.

Jasonr

Fri Jun 16 2006, 01:24AM

Registered Member #167 Joined: Mon Feb 13 2006, 06:41PM
Location: Waterloo, WI
Posts: 54

have you played with difffernt sizes and thickness AL? I am curiuos why so think of AL? and why you picked that thickness.

also I am thinking if where you soldered you connections if you were to twist them with a pliers and then solder them if they would hold up better. I saw that on your web site.

but this is fun enough that I might just build one. since I have a small 3.6kJ bank sitting right here.

Wilson

Fri Jun 16 2006, 03:07AM

Registered Member #78 Joined: Thu Feb 09 2006, 11:27AM
Location: Sydney, Australia
Posts: 133

The formula to calculate the total height displacement, using only a time is as follows:

S=ut+0.5at^2
u=initial velocity (m/s)
t=time (sec)
a=acceleration due to gravity = 9.8ms^-2
Now, you need the time it takes for it to fall from the apex of its flight, to the ground. u=0 at the apex of flight, so the formula becomes:
s=0.5 x 9.8 x t^2
Sub in the time in secs for an approximation (air resistance isn't considered here) of the total height in meters

Hope this helps,
Wilson

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