Chronograph App?

[Pine]

I have heard of an app for smart phones that uses sound to measure the speed of an arrow.
Have any of you tried one of those apps and where can you find it?
I have looked on google play for a couple days and haven't found what I want yet.
I'm not one that is concerned with speed but there's a bowyer that wants me to do a review of one of his designs and I would like to do a speed comparison with a couple of custom bows and a factory brand top of the line. And I don't want to dish out a bunch of money for a real chrono just for a test.
Any help would be greatly appreciated.
Thanks; Graps

[Big Ed]

I believe that a chronograph based on noise would be inconsistent due to some bows being quieter than others.

[MIBIGHNTR]

How GREAT would that be though to have a phone app chronny!! 

[2madjacks]

Would be cool to have but... my quick google search shows most people say the chronograph app they've tried requires all bow and arrow info similar to a dynamic spine calculator.  So it's assumed that the app is just making a calculated guess with the info. plus arrow noise.

[Trenton G.]

I've got an app that I can plug in to my chronograph that gives me info and stuff, but it still requires the actual chronograph.

[wingnut]

Chronos either user shadow detectors or doppler radar.  Neither of which is in a phone.

Mike

[flyonline]

I believe some electric RC flyers use sound to measure speed via doppler effect. Not sure how accurate it is, suspect it's more of a comparison rather than a super accurate reading. Somehow I think a phone mic would struggle to pick up the sound of an arrow vs the high speed scream of a prop turning at crazy RPM 

[Miikka]

I've used an app called Bowometry that uses sound to measure arrow speed. It's quite the finicky thing but If you have reasonably quiet place to shoot you can average some shots to quite reasonable accuracy. I think it's best for comparing setups rather than to get definate arrow speeds. Just Google Bowometry to find it

[Pine]

All I'm looking for is a cheep way to compare bows.
Going to shoot in my garage with the doors shut.

[Pine]

Thanks Miikka, that's the one I was looking for.
I just couldn't remember what it was called and I couldn't find it.
I just read the website and that is it. 

[McDave]

It doesn't sound to me like that would be very accurate.  You would probably be more accurate by just aiming at a given spot and seeing where the arrows hit.  Arrows that hit lower would be lower velocity and arrows that hit higher would be higher velocity.  Of course, a lot would depend on how consistently you could shoot between different bows.

[Bldtrailer]

speed is over rated just plug into the stu or 3 rivers arrow setup and you should get a close enough speed . quietness and known arrow drop(being able to hit the spot)much more important (ps I have an old flip phone>>>--> no apps)

[Sam McMichael]

I tend to be suspicious, because no two bows sound exactly the same. That is also true for arrows, even from the same set. With so much natural variation, it just seems unlikely that these differences can be reconciled. Admittedly, I am not familiar with such an app, but how do you even out the sound differences in each bow measured? Any engineers or physicists around to give an explanation that the average guy can relate to?

[luv2bowhunt]

Hey Graps, I'm just south of you in Byron Center and have a Chronograph if you want to borrow it for a couple weeks.