SR-25 homemade HPA engine with Bluetooth FCU update - 50rps and more :)
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- Опубліковано 26 сер 2024
- Update on HPA-related progress. I've dropped this in the SR-25 now and it feeds and shoots flawlessly with the Lonex hop unit and r-hopped barrel.
The engine is based off Kuba's design, adapted for the SR-25 gearbox and simplified a bit.
It uses a basic 3/2 NC solenoid valve and a spring to return the nozzle, so it's not that efficient. Working on an air return design that will use a MAC bullet valve (pretty similar to the Wolverine engines), which will be a lot more powerful, efficient, quiet, and all fit inside the gearbox shell.
The coil engine needs some design changes to be more efficient and run on 11.1V LiPos (currently needs two 9.9V LiFePO4s in series to operate).
Nice to hear an English voice behind this project! Great work
That's actually awesome. You should make some drop in kits and sell them!
An option I like on my GATE Titan is burst/auto mode in the auto position.
This basically fires the n-round burst then looks at the trigger - if the trigger is still pulled, it just carries on firing auto with no discernible delay.
This means if you just flick the trigger, it fires an n-round burst, but if you hold the trigger, it fires full auto.
Hello, I have a question. Is the Bluetooth/Arduino code already available? Would like to build something like this myself.
I'd be interested to know the details of the valve, FCU, etc. please.
Hey there i was wondering if i could get the Arduino Sketch for this? and the name of the app being used as i am trying to make a project similar to this.
Hi, those solenoid valves say min activation time is 0.05 s so max 20 rps...
How are you getting 50 rps?
Hey man, how long is the signal to open the solenoid valve? (How long you keep it opened?)
Can you make a video where you assemble it?
This is so cool!
With the small sizes of the new lipo are you having in mind to go further with the coil project? Nice job
is it possible for you to share the details of this electromagnet coil?
hey great job, any chance you release the arduino sketch and android app?
can you drive solenoid directly from the arduino nano?
David Koplan you need a driver, like a MOSFET - the Arduino can only supply ~40mA itself.
Hey I recreated the design.... and have problems getting the info through the bt module. Could you send me the arduino sketch it would be really helpful.
any uptade on this design will be nice
It works, I posted a scopecam vid of it a lil while back too. I'll be working more on the electromagnetic engine soon.
amazing
how much pressure do you need for solid fps?
can you share the code
Thats running nicely. Any chance you might share your arduino sketch?
i got an a&k sr25 just laying around here doing nothing so this would be insta buy for me!
Nice :)
what fps does this get?
It's capable of 550 fps with 0.20 g at the max pressure the valve can handle. It wasn't the most efficient engine though and liked to tear up hop buckings if it wasn't perfectly aligned. I rebuilt the SR-25 later with a small HPA tank in the stock and a Wolverine Reaper engine to get the most out of it. Got a video on that on the channel.
@@Snakebitey What solenoid do you use? My engine isnt even close to that fps. It caps out between 250 and 280 with .28g bbs at 120 psi.
@@BackdraftAirsoftI think it's an airtac 3V110-06 with 12 Vdc coil
Any chance I can get the source to your FCU?
Charles Estes It's a bespoke script I wrote to go with the Bluetooth app, so won't mean anything by itself. it's being constantly revised so when I'm on a more final version I'll publish it all!
Mainly I wanted the arduino sketch. I want to see how you handled semi auto. My program is IMHO not that great. I am used to ladder logic and if I put a PLC in there I could make it do all sorts of things, but...
Charles Estes I use a while loop that stays looping while the trigger is held - it just can't continue the script until the trigger is released. It might not be the best way but it works...
No I actually like that better than my way. I was setting a bit and then doing a goto bypassing the main script until the trigger is released. Kinda a latch and unlatch.
Hi!
looks cool.
I also rework my Gear to Hpa.
please give a link to the sketch and the name of the program on your phone to control the Arduino, or where it can be downloaded.
thank you in advance.
Neat stuff. If you're interested you should check out my facebook page ( cowle airsoft) lots of homemade hpa engines.
Hello, my name is Kevin Forney, you may recognize my name from the KC02 Facebook page if you are on it, I am working on an ambitious HPA project and I’m not great with electronics. I am looking for some help on the electronic portion of it. If you would be willing to i would greatly appreciate it. Thanks in advance
Heya - I do indeed, I have one of your pistons in my KC-02 :) I'd love to help out but I won't have time for a new project for a few months. Please let me know if you have some questions though and I'll do my best to help out!
Snakebitey thank you for the response! If you could send me a friend request on Facebook I would love to discuss the project with you. It will be a few months till I’ve finished the mechanical part of the kit so I’m in no rush. Thanks again!
Clarksville, Tennessee?
Yessir!
Incoming :)
I’ll give you $ 9.95