Author Topic: Win an FX Radar Chronograph  (Read 503 times)

Alan

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Win an FX Radar Chronograph
« on: January 18, 2020, 11:32:18 AM »
We all know of Bob Sterne, and his contributions to the airgun hobby. His depth of knowledge of the science behind airguns, is in fact, legendary! Based on this, the staff of the AirGunGuild (Bob is a member of the staff), decided to challenge the membership about their depth of knowledge of that science. Therefore, in the next day or so, Bob will post his challenge questions. Since the answers aren’t simply yes/no, we’ll give the membership until February 1st., to post their answers. Bob alone will decide who the winner is, and rightly so. Whomever that winner is, will win an FX Radar Chronograph, as supplied by Utah Airguns.

Good Luck to all!


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Alan

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rsterne

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Re: Win an FX Radar Chronograph
« Reply #1 on: January 18, 2020, 11:47:52 AM »
Win an FX Radar Chronograph!

You have been reading Bob Sterne’s articles, particularly those at Hard Air Magazine, and now you want to put that information to use....  You want to build your own custom PCP, and need to figure out some important details....  Your goal is to end up with a regulated PCP, fed by an onboard 500 cc bottle that is filled to 300 bar....  You want a .257 cal that shoots 70 gr. slugs at 950 fps, from a 24” barrel....  You need the answers to the following questions (all answers to be in whole numbers, no decimals)….

1.  What is the FPE at the muzzle for the intended goal?....

2.  To achieve 90% of Bob’s “lofty goal” FPE calculation, what setpoint pressure (in psi) do you need for the regulator?....

3.  What is the plenum size (in cc) that Bob would recommend?....

4.  If you achieve an efficiency of 1.00 FPE/CI, how many shots should you get before the pressure falls below the setpoint?....

The first person to post the correct answers (by time and date stamp) to ALL of the above questions in this thread will win the FX Radar Chronograph from the AirGunGuild!....  If nobody posts all the correct answers by Feb. 1st, I will decide an alternate method to determine the winner.... My decision is final....  ;) 

Bob
« Last Edit: January 18, 2020, 04:24:50 PM by steveoh »
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steveoh

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Re: Win an FX Radar Chronograph
« Reply #2 on: January 18, 2020, 04:27:07 PM »
Win an FX Radar Chronograph!

About the FX Radar Chronograph:

FX Radar Pocket Chronograph Features
* Uses Doppler Radar to obtain velocity, energy and other stats
* Controlled via Android/iOS smartphone app
* Bluetooth compatible
* Runs off three AAA batteries
* Allows user to input variables like pellet weight and radar return
* Measures velocity of Pellets / BB’s / Airsoft / Archery / Paintball

Using the first ever pocket radar ballistic chronograph from FX Airguns of Sweden, this
ballistic app enables the recording of data from 20 fps to 1100 fps.
Ever wanted to know the speed of your pellet, BB, Arrow or Paintballs, then this app will
allow you to create profiles and store data from all your testing and tuning.
Vocal shout outs for each shot can enable smooth target grouping at the range, just listen to
the result and don’t take your eye off the target.

Export the data strings for further evaluation, save and record your days testing using the
profile function.

It’s easy to check your power, take the FX Chronograph out of your pocket, start Bluetooth
and start the app on your phone.

Now you can check your power while zeroing and shooting groups.

Features Include:
- Realtime record of shots
- Clear display of shot strings
- Audio shout out’s, switchable OFF and ON **
- Profile Creation – Remember settings for easy recall
- Easy to select velocity ranges
- Scope Bore Height input (for future development)
- Input of Pellet data for profiles
- Multiple Unit Read Outs – FPS / MPS / FT Lbs / Joules / KMPH
- Radar Return adjustment for sensitivity
- Shot Count Data exportable to clipboard

Developments for future versions will be available and registration within the app is
suggested to enable update notifications.
« Last Edit: January 18, 2020, 04:37:55 PM by steveoh »
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sixshootertexan

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Re: Win an FX Radar Chronograph
« Reply #3 on: January 18, 2020, 10:16:41 PM »
140.31
3200
140
18
CCS 2300, CCS 2400, Custom Built Regulated .25, Custom Built PRod Clone, .308 Bullet shooter, XS46U .177, Custom regulated .177, 850 Hammerli .177

Nvreloader

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Re: Win an FX Radar Chronograph
« Reply #4 on: January 19, 2020, 09:37:41 AM »
140 fpe
2950 psi
120 cc
16 shots

Thanks,
Don
« Last Edit: January 19, 2020, 11:15:46 AM by Nvreloader »
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Capt45

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Re: Win an FX Radar Chronograph
« Reply #5 on: January 19, 2020, 11:47:48 AM »
140 fpe
31psi
135 cc
9 shots
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T3PRanchAGS

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Re: Win an FX Radar Chronograph
« Reply #6 on: January 19, 2020, 02:19:55 PM »
140 fpe
2428 psi
140 cc
4 shots
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d_boom

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Re: Win an FX Radar Chronograph
« Reply #7 on: January 20, 2020, 07:42:19 AM »
1) 140 FPE
2) 3045 PSI
3) 140 cc
4) 20 shots
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Alan

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Re: Win an FX Radar Chronograph
« Reply #8 on: January 22, 2020, 04:27:04 AM »
So far, no one has calculated (guessed?) the correct answers. Remember too, only the right answers get the prize. Keep trying folks!
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Alan

I have an Omega compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your portable tank as a courtesy.

d_boom

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Re: Win an FX Radar Chronograph
« Reply #9 on: January 23, 2020, 05:31:33 PM »
Assuming those of us who guess/figured incorrectly can still try again?  Here I go again;

1.  140 FPE
2.  2699 psi.
3.  140 cc.
4.  24 shots

I am interested in reading how Bob's figured these answers so I can better understand.
Thanks,
Danny
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rsterne

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Re: Win an FX Radar Chronograph
« Reply #10 on: January 23, 2020, 08:34:17 PM »
I don't see a problem with entering again, but it will wipe out your previous answers, of course.... like changing your answers on a test....  ;)

I try and check it a few times a day.... I'm a bit surprised there aren't more entries, it's a pretty nice prize....  8)

Bob
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Loren

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Re: Win an FX Radar Chronograph
« Reply #11 on: Today at 05:39:24 AM »
Damn algebra!!

140 FPE Muzzle Energy
2991 PSI reg pressure
140 cc Plenum size
20 shots

Cool contest!!
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Alan

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Re: Win an FX Radar Chronograph
« Reply #12 on: Today at 05:53:58 AM »
Loren brings up an issue. The rules indicated that you must have a certain number off posts first, but I'll officially negate the rule for this contest. I hope this will increase the participation.
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Alan

I have an Omega compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your portable tank as a courtesy.