Here's an excerpt from the RT Chrono procedures page at http://www.airgun.com/rtchrono.html
"...It is important to understand that when the air chamber is filled with hot air under pressure, it cools off rapidly over several seconds. This cooling will reduce both the chamber pressure and the velocity.
If you fire the RT while the air chamber is hot (high pressure) your velocity will be higher. If you wait, the air chamber will cool and velocity will drop noticeably. The faster you fire your RT the more consistent your velocity will be."
That being said, here's my question. After reading the post (from Eric_AGD) that said that using the superbolt can cause your chrono velocity to actually be 30fps higher than with the stock bolt, I took my Emag out today to chrono it. I gassed it up and chrono'd 4 shots in a row at 252. Then it bounced a little between 250-260 but stayed fairly consistent at this low speed. This seemed weird as I was expecting the chrono speed to be up over 300. (Last time I chrono'd my stock bolt the speed was right around 275-280.) (When I chrono'd, those were the first shots I fired when I gassed up the gun.) I then took off the chrono and rattled off 2 strings of about 10-15 balls each at a very quick pace. I then chrono'd again and now the speed was up around 295-310. It was consistently that high too. Now, I figured this was due to the valve heating up due to the aforementioned rapid firing but if that were the case, wouldn't the valve cool down fairly quickly (as the RT Chrono instructions state it would) and I would see my chrono speeds start to drop ? And if not, why does my gun originally chrono in the 250's and then after a little while, chrono's in the 290's/low 300's ?
Give me a clue here. Maybe I'm just a moron...
"...It is important to understand that when the air chamber is filled with hot air under pressure, it cools off rapidly over several seconds. This cooling will reduce both the chamber pressure and the velocity.
If you fire the RT while the air chamber is hot (high pressure) your velocity will be higher. If you wait, the air chamber will cool and velocity will drop noticeably. The faster you fire your RT the more consistent your velocity will be."
That being said, here's my question. After reading the post (from Eric_AGD) that said that using the superbolt can cause your chrono velocity to actually be 30fps higher than with the stock bolt, I took my Emag out today to chrono it. I gassed it up and chrono'd 4 shots in a row at 252. Then it bounced a little between 250-260 but stayed fairly consistent at this low speed. This seemed weird as I was expecting the chrono speed to be up over 300. (Last time I chrono'd my stock bolt the speed was right around 275-280.) (When I chrono'd, those were the first shots I fired when I gassed up the gun.) I then took off the chrono and rattled off 2 strings of about 10-15 balls each at a very quick pace. I then chrono'd again and now the speed was up around 295-310. It was consistently that high too. Now, I figured this was due to the valve heating up due to the aforementioned rapid firing but if that were the case, wouldn't the valve cool down fairly quickly (as the RT Chrono instructions state it would) and I would see my chrono speeds start to drop ? And if not, why does my gun originally chrono in the 250's and then after a little while, chrono's in the 290's/low 300's ?
Give me a clue here. Maybe I'm just a moron...
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