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You can input pellet weight in grams and it will calculate and display muzzle energy. Here it is in the instructions : Kinetic Energy Test Instructions: (projectile weight input needed) 1: Additional speed energy measurement mode: When the power is turned on, while the display indicates – SU...

Its hidden under the Lipo unfortunately.

Yes as I mentioned in the first post, I had to add solder to a couple of the display pins. As to the surface mount since the parts count is so low and the circuit board footprint has to be large enough cover the sensors at each end its probably simpler and cheaper to do it "old school".

It does retain the pellet weight after use. The battery is lithium polymer and will not drain over time, all in all the design is very good. A Bluetooth connection would be the icing on the cake for me, and would only add a couple of $ to the parts price .

Here is a copy of the manual, only metric i'm afraid: Light Curtain Type Bullet Speed Detector (portable model) Multifunctional High Precision Speed Measuring Device Operating voltage: DC3.7v (built in polymer lithium battery) Accuracy: test error less than l%. Dimensions: 100*60*110mm...

I thought I would try one of these $25 Chinese chronos from eBay. Initial impressions were not good since some of the display elements would flicker in use, this was due to lack of solder on two of the display pins After fixing this however I became quite impressed with the basic unit except...

Thank you all for the great comments. To JamesD to the best of my knowledge the patents for the Brocock air cartridge have now lapsed, as to my design, the important part is hidden behind the cross hatched area on the second picture, it would take a lot of effort to re-invent it and if somebody...

Hi all, I’m new here so be gentle with me! The Covid lockdown has re-kindled my interest in airguns after 10 years so I thought I might show something that you may not have seen before. This is my homemade M16 semi-automatic air cartridge rifle, it shoots 0.177 pellets at about...