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PostPosted: Wed Aug 29, 2018 3:56 am 
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Joined: Wed Oct 17, 2007 3:27 am
Posts: 2552
Location: Winnipeg, Canada
This would make sense if the sensors were flush with the top of the unit, which mine aren't, and no diffusers in place. They are recessed to read against the diffusers, and not the light source. The manual for my chronograph recommends against shooting for readings without the diffusers in place.

-D.S.

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PostPosted: Wed Aug 29, 2018 3:26 pm 
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Joined: Sun May 20, 2007 10:26 pm
Posts: 302
Location: Any Town ONTARIO
lleader wrote:
wesb2007 wrote:
Anyone else getting their Chaser over the chrony? It'd be great to compare velocity.

I guess you forgot this post of mine back on Aug.03 when I got my Chaser:
topic80143-14.html

Some info on comparing a little airsoft chronograph to a Chrony in a post I made some time ago:
http://www.airgunforum.ca/forums/topic64144.html

Also I would like to note that a single light source located between the two sensors will always give a higher than real reading. There is much info on how to light a Chony on the internet. I read one post in particular that discussed at length why a single light source was a problem but I cannot find it at the moment.

Here's a simple diagram of why a single light source is not a good idea:
Attachment:
The attachment singlechrony.GIF is no longer available

This diagram is incorrect as most light sensors are slot loaded and not on top , so the single light theory is of little effect to properly engineered chronographs . See the corrected drawing


Attachments:
corrected.gif
corrected.gif [ 10.66 KiB | Viewed 90 times ]
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PostPosted: Wed Aug 29, 2018 11:24 pm 
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Joined: Sat Nov 05, 2016 10:52 am
Posts: 2614
Location: Caronport, Saskatchewan
Very interesting Pelsby and DS, I guess the fact mine shoots faster indoors may have a different reason then. Lleader I do remember now you posting your velocity, my apologies. That link you gave wasn't the right one though, so I'll have to look for it to see what the velocity was.


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PostPosted: Wed Aug 29, 2018 11:38 pm 
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Location: Caronport, Saskatchewan
Here it is =)

Quote from lleader
“Didn't have a lot of time to play with it yet (boo!), but I did shoot a mag full of the 13.43gr (brand X? are they really JSBs?) averaging 428 fps. Also a mag full of 11.9gr RWS Hobbies averaging 452 fps.“


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