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MagnetoSpeed test

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d4570 View Drop Down
.416 Rigby
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Post Options Post Options   Thanks (0) Thanks(0)   Quote d4570 Quote  Post ReplyReply Direct Link To This Post Topic: MagnetoSpeed test
    Posted: 09 January 2013 at 02:56

http://www.magnetospeed.com/



So far we are liken it! went out yesterday ,in a dry hurricane,and tested 30 or so loads. worked very well and it can't blow down just as you shoot. The strap that holds the unit on to the barrel will have to be made better but the readings where just where we wanted them. The only load I had documented for speed was my hot 45/70. I had it checked before and averaged 2495 fps. Yesterday the temp was around 35* , we checked it before at 85*, the MagnetoSpeed clocked it at 2490 fps average and a s/d of 11. So I think it's accurate. We did several shot shell loads and came up with the published speed out of my 28" full choke 870.I did find out I can ramp up my 22/250 even it put bullets in the same hole at 100 yards it only going 3280 fps with a 52 gr match king. I have some 60gr Nosler going 3800. and a 243 that 3500 so I'm going to up the 22/250 but I'll have to try reloader 15 to do it,just cant get enough Varget in the case.

Remember: Four boxes keep us free ,the soap box, the ballot box, the jury box, AND the cartridge box
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 09 January 2013 at 11:12

they had some problems ,   early.  but seem to have fixed them.

 

thanks Dale for the review, been thinking of getting one.  My chrony is ancient.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote CB900F Quote  Post ReplyReply Direct Link To This Post Posted: 09 January 2013 at 14:00

Fella's;

I'll admit it's convienient, but I doubt that it's the most accurate of chronographs.  With that short a spacing between the sensors, I'm not giving the plus/minus capabilities anything in the single-digit percentages.  My Oehler 35 suggests that for anything over 3000 fps, you go to a four foot rail to get dead-nuts readings.  Now the Oehler is about 20 years old & I'm sure that technology has advanced, but still.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 10 January 2013 at 04:05

The working of this model is magnet, not light activated.

the advantage is no screwing around with set up/tripod/alignment/etc.

I saw them and talked to the reps at the big NRA show.  Seems like a 'do it" thing. 

Now, when I use my chrony, I don't care where it shoots; I'm just checking MV as part of load development.  I've heard complaints that it changes the point of impact about .5 inches.  WOW, let's see attaches to barrel and changes harmonics...no mystery there.

Getting it alighned and setting up tripod on other models, means being down range and if you shoot at a crowded place that sucks time.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Igbo Foo Quote  Post ReplyReply Direct Link To This Post Posted: 10 January 2013 at 06:59

Whether or not it's light activated or magnetic sensors don't matter.  Any of em's gotta time the interval between on and off in order to give you a speed.  What switches on & off don't matter.  So now you've got a clock tickin' away over a distance measured in inches.  Seems to me at high bullet velocity you can have a helluva difference in announced speed for just one tick of difference on the clock.  Don't care how fine they say they slice it, sounds fishy to me.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote d4570 Quote  Post ReplyReply Direct Link To This Post Posted: 10 January 2013 at 07:24

FOO

Thats the same thing they said about an electric light bulb, you know that right?



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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 10 January 2013 at 07:47

Foo you are right.  In 1966 when I designed my first digital chronograph, I used a 10k hertz oscillator (those clicks); and 10 foot between frangible switches.  But today you can have a high speed oscillator (ticking clocks) like a 10 gig Hz.  so the margin of error of  one click can be small enough for a few inches.  Your right all the chronograph does is count pulses, and divide the distance between the screens/switches by the distance.

The digital Avtrons also used the 10k oscillator and a binary counter.   Decades later, in the late 1980s the Chrony was the first chronograph to use a ASIC chip for a chronograph and IIRC used a 100k oscillator.  So the longer distances between the 'screens'/switches were necessary to get the desired accuracy.  Ask CB he is pretty smart on this stuff.

What is an electric light bulb?  Is that those glass encased candles, I'm starting to see?

 

PS Edison did not invent the filament light bulb....he invented a evacuated glass bulb lamp.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Irish Bird Dog Quote  Post ReplyReply Direct Link To This Post Posted: 11 January 2013 at 05:38
no experience here on subject,so for WIW,  I ran the mango thingy site past a Electrical Engineer guy and he never saw one 'cept for the ad from them in link but feels the current technology would make it a feasable device.
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