Gamo Spring Upgrade [UPD]
So, the gas spring is slightly more powerful in the two rifles I happened to test. That was never the plan; it simply turned out that way this time. The smooth shooting behavior is worth accepting a power REDUCTION, so to have MORE is gravy. I think that if the gas spring produced similar results to the steel spring, it would be well worth the cost.
gamo spring upgrade
The gas spring in my R1 is going on 13 years old and counting. I wrote about it in the R1 book that was published in 1995. I sold that rifle, then bought it back four years later. Not one foot-second of velocity was lost in all that time.
Gas springs vary less than steel in the cold because they are lubricated with less grease to thicken and harden. They are not as good as pneumatics in this respect, but much better than steel springs. I tested at zero degrees F.
Other applications of shooter-compressed gas for propulsion (pump pneumatics) require a LOT more effort to get the same power as a springer. I always figured that this had something to do with the loss of energy when the compressed gas (air) cools off after pumping.
You must have seen scientific display using liquid nitrogen and know how cold that nitrogen is. It would not be feasible to have liquid phase nitrogen in that gas spring and not have excessively high pressure at the same tme. Gas spring typically have preload as well. You will need an air pump to adjust that preload.
Theoben used to put a Schrader valve in their units and shooters could pressurize them from outside the gun. That lead to many problems when people overpressurized their springs and ruined the rifles.
Gas springs seem to rated as to pressure, not spring constant. The only way to do that (as far as I know) is to either have the working fluid in a liquid phase or to have the change in internal volume be miniscule over the stroke of the piston. In the latter case, obviously, there would be a change in spring rate but it could be almost negligible.
I have enjoyed the recent blogs concerning gas spring conversions. You mentioned that you own a Theoben Fenman. Any thoughts or experiences with the performance of that gun as well as how it might compare to the currently offered Theoben Evolution?
auto gas springA car strut is essentially a shock absorber that is mounted inside a coil spring. Although a car strut provides a dampening feature similar to shock absorbers, car struts deliver considerably more function. These components control and support weight, unlike shock absorbers, which simply control the speed of the weight being transferred. Car struts are designed with mounting points placed in the middle, which are used to reinforce the chassis and other components of the suspension.
Each Titan XS spring is hand wound to exact specification, then heat treated and tempered to ensure ultimate performance and maximum durability. During the final tempering stage, they are coated with a specially formulated finish, a derivative of PTFE and Teflon that is hard yet flexible. Self-lubricating multiislip properties eliminates the need for conventional spring lubrication, however grease application is still recommended. The almost friction free operation of the Titan XS Mainspring reduces the possibilities of dieseling to a minimum. Maximum power is maintained for longer than most other springs.
Please note: For the installation of springs into Air Rifles it is sometimes necessary to remove coils by way of grinding or cutting the spring. This is normal and should be taken into consideration before fitting. Please test your airgun to ensure you remain below power limits for your country.
High pressure gas spring (hereinafter referred to as HP). It is pumped with nitrogen (N) at the most optimal pressure for the corresponding model of a spring-piston air rifle. All gas springs are equipped with a pressure regulating (bleeding) assembly. The GS will allow you to carry the rifle in the cocked state for a long time without any deterioration in performance characteristics (tactical and technical characteristics), reduce recoil, shot noise, increase the rifle's resource by 5 times and improve accuracy when firing. Under optimal operating conditions, the resource is up to 8-10 yew. shots without refueling. The advantage of gas springs in comparison with conventional metal springs is that their stiffness coefficient does not change over time, which means greater stability of the rifle's characteristics due to the absence of spring shrinkage. All our GSs are tested and pressurized for overpressure, which means that you get a reliable, proven high quality product that will not let you down in any weather from -20 to +40 * C. Gas springs use special lubricants that work optimally under extreme conditions.
When ordering a gas spring, you can specify the power option: relaxed, standard, reinforced, your own version. The standard power is close to the native coil spring or slightly higher, for each rifle model its optimal pressure is selected. When ordering a gas spring: Specify your version of the pressure you need, which should be in your gas spring.
High quality, selection of the optimal power of the GS, extended warranty for all products. Warranty and post-warranty service of gas springs. Selling both wholesale and retail. Also manufacturing of gas spring by individual sizes.
With BSA marketing both the BSA range and the Gamo range of air rifles you certainly have a good diversity of hunting arms to choose from. If you are looking for a good value hunting air rifle that has spring propulsion then any one of the Spanish made Gamo range of air rifles will suffice. I had on test the Gamo Shadow DX which is a sporter type rifle with synthetic stock and enough power for normal hunting ranges. It differs from the previous Shadow model due to fibre optic open sights and insets to the synthetic stock.
The action is slender and has a typical BSA/Gamo scope rail attachment that has a 11mm raised rail and recoil stop to keep your scope from creeping. The cocking action is very smooth, helped by the leverage from the longer barrel and the trigger is solidly engaged with just a hint of spring noise compression that soon goes after a bit of use.
When I picked up the Gamo Shadow for testing I just thought it was another cheap springer, but upon shooting it with a variety of pellets, scoped and with open sights, I warmed to it. In fact other than the flimsy forend and slightly lower power output than I expected the Shadow would make a good first time or low budget hunting tool. My only reservation would be the muzzle report, it was loud and perhaps the Gamo Whisper might be a better bet if this troubles you.
Yes, you can. However, should you? The most common kits are typically for spring-pistons and can involve a stronger spring. There are drawbacks, though. For instance, a stronger spring will mean the cocking process is harder. Will this take some of the enjoyment out of it?
Air rifle comprising a trigger that actuates a firing mechanism that acts on an interconnection piece; that exerts a force on a counter-pawl that releases a spring for driving a piston, in which said firing mechanism is an electronic firing mechanism with an electromechanical actuator and a switch for actuating the electromechanical actuator, the electromechanical actuator being arranged in such a way that it exerts a force on the interconnection piece in a direction substantially parallel to the direction of the barrel of the gun.
3. The spring-loaded rifle of claim 1, wherein said interconnection piece comprises a swiveling piece configured to convert the force exerted by the electromechanical actuator parallel to the rifle body into a force exerted by the interconnection piece on the counter-ratchet in a direction other than parallel to the rifle body.
6. The spring-loaded rifle of claim 5, wherein said independent auxiliary firing mechanism is configured to require greater trigger travel for activation than a degree of trigger travel required for activating the electronic firing mechanism.
15. The spring-loaded rifle of claim 14, further comprising a flexible rod attached to the trigger and configured to operate the switch, wherein said plate also comprises a guide for the flexible rod.
We have measured 3He/ 4He, 4He/ 20Ne andCO 2/ 4He ratios, and δ 13C values of CO 2 in eighteen samples from crater fumaroles of Galeras volcano, Colombia, and seven samples of bubbling gases of the Pandiaco mineral spring located about 8 km east of the volcano from April 1988 to July 1995. The 3He/ 4He ratios of crater fumaroles, corrected for atmospheric contamination, increased significantly from 5.47 Ratm in December 1989 to 7.93 Ratm in August 1990 and reached a maximum of 8.84 Ratm in May 1992. The ratio then decreased gradually until July 1995. Overall variation of helium isotopes appears to be related to the current activity of the volcano. The 3He/ 4He ratios of Pandiaco mineral spring were constant between April 1988 and November 1991 and increased in April 1993, although experimental error is large. The δ 13C values of CO 2 of crater fumaroles show negative correlation to the helium isotopes, while those of Pandiaco are relatively constant. Based on the δ 13C values andCO 2/ 3He ratios, it is possible to estimate fractions of upper mantle carbon in these samples. Calculated mantle fractions are 3-10% in crater fumaroles, while those in Pandiaco spring are negligibly small. 041b061a72