Hello I hope you are having a great time, I am addressing you to be able to ask you a question that intrigues me a lot, what kind of gear transmission do you use to make your catapults and launch the triballs super fast, without further ado I say goodbye sending you a cordial greeting
When you say “gear transmission/transition” (you typed both, so I’m not sure what/which you meant), do you mean the vex gear cartridges inside the motor, slip gears, etc.? More information would really help us help you 
I think he means “gear ratio”. Most teams that I saw from the FUN RECF thread use 1:3 gear ratio on a red motor I believe (12:36 or 24:72) for their catapults resulting in 33 rpm catapults. I’m not sure how teams manage to lauch 44 triballs in under 40 seconds with this gear ratio on 12 tooths, but someone may explain that better.
Cordial greetings to you too! 
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Thank you very much for the support 
It would be the sliding gear mechanism they use to make the catapult very fast and compact, I’d like to know what gears they use and how many teeth they remove from the gear and finally, know which engine cartridge they use and how many motors are ideal to use.
Without further ado, I bid you farewell and send you my cordial greetings
Most teams that I know use the red(torque, 100rpm) cartridges in their motors for their catapult/puncher, although I know a few teams who use the green(standard, 200rpm) cartridges in their motors for the launching mech. If you can I would use two motors, or 1.5 motors(combining an 11W and 5.5W motor). As @Gigahertz.t said, many teams use 12:36 or 24:72 for their gearing. The number of teeth you will need to shave off will depend on the power of your launcher, and which gearing you decide to use will also affect the number of teeth that need to be shaved off to make the slip gear.
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Hello good day
I thank you very much for having been able to tell me such valuable information, thank you very much
I would like to answer another question I have and I would like to see if you can solve it for me.
The doubt I have is on the subject of pneumatics, I have seen teams that use double-acting pistons and only use the one that is to leave and the one that is to return use a rubber band, here what I would like to know is how they configure it, if they continue to use double-action selenoid or change it for a single-action one, And since they program it because I’ve already tried it and when I want to make it come back the piston doesn’t come back, that would be my doubt that I have.
Without further ado, I bid you farewell and send you my cordial greeting.
Also some teams may use that 1:3 gear ratio and double slip the gear so that the catapult will load back twice rather than once in one rotation of the motor.
Yo you type like the most formal person I ever met.
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Honestly, when I first started working on pneumatics I thought it was going to very difficult, however, I relied that the only thing you really need to know is that air goes in and out like a boolean. And like the air going out tubes together and the air going in tubes together.
We did 24/48 then 36 (slip gears) /60 on 100 RPM motors to get 33.3333 RPM
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