Game in the Brain

After learning more about the internals Its not so hard to make a matrix to measure the relationship of Cost to Power. Specifically how as Spring FPS goes up, more and more parts are needed.

SP is the meters per second (I think; so I have not found a source) with a 0.2g BB. To get the fps x3.28 or x3.3

+66FPS (Quiapo Source; Assuming SP100 stock spring). SP120 Spring is Php300. Shims Php150 and Metal Bushings +Php350. Total: Php800.

Note: air-nozzles php150, O-rings php150, hop-up rubber Php150, can variably be defective. This may add Php450 to the cost.

Spring Settling. On the box it says the stock spring is 330fps (or SP100), but when you have it checked with a chrono often it has a value of 50-60fps up.

AGM MP44/StG44 aka Quality Power MP44/StG44. is at 450fps out of the box. When the spring settles it will be at 390-400fps. I’m using a 8.4V battery with this.

How can the battery and dynamo pull back a much stronger spring when it was still new? The resistance to pull the spring is the same, what really changes is how efficiently it returns the energy. So there is energy efficiency loss when the spring expands back, pushing the piston. This is the same from Mechanical principles surrounding elasticity is found in bows, springs and crossbow. The ability of the spring to “store” and “return” the same amount of energy put in diminishes.

That is why even when my G3’s spring is only at [email protected] my 8.4V battery can’t still pull it back.

+??FPS. Taking what’s above, the next upgrade. Stock Type-0 Cylinder Php350. A metal spring guide with bearing Php400. Metal Piston Head php350. All together, this is Php1100. Plus all above, that runs a total of Php2350.

Hop-up. Do not underestimate the power of hop up to improve range and accuracy. If your gun is clocking 365 because of the .25 the loft effect can still give it a lot of reach.

+40FPS . 6.04mm Tight Barrel Php1500-1800. The added power is from the more efficiently air pushing the bb as there is less “leakage” of air around it. This runs a total of Php3850-Php4150.

Total FPS bonus from the stock 330FPS right now would be around +80-90FPS.

+33FPS. Now this is where there are a lot of changes. A change of Spring or if you did this all in given the first opportunity will mean an additional cost of Php300. A New Steel Gear-set can cost Php700. You will need a 11.1V Li-poly battery at Php1500. This by itself is Php1800 the most expensive STEP when you consider the other previous steps.

Performance Variations: As a newb, and without a Chrono, I have yet to see how dramatically does Piston head, Airnozzle, Hop-up tweaks etc. can affect FPS. If I can Isolate it, even with my anecdotal experience maybe I would be able to tell if the gun is doing fine or not.

Arnies Airsoft BB Velocity Calculator will be useful in these calculations. Just Take joules and use it to figure the supposed velocity per BB weight. My G3 is 1.85J, my AK is 1.57J, the MP44 is at 1.94J, and the Glock17 is 0.78J.