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devilwood

Brushless flywheel Kit

Hi everyone I'm new here and wanted peoples thoughts on something im making at the moment.
I have a few stryfe's and ravens they are good but like everyone else I wanted to up the power and range so I was looking on the internet and I see most people up the voltage and put a slightly up rated brushed motor. I wanted to take it to the next level and use brushless outrunner motors, i know this is nothing new and some people have done this but im trying to make a kit that is so simple anyone can modify there gun and enjoy the extra power.

I have attached a picture of the first prototype housing/barrel it fit's in the exact same position as original flywheel housing and the motor controller will sit behind it out of the way to make it really compact.



The motors run off three 14500 trustfires so it will use standard battery tray and the motor's spin at around 30,000 rpm, there a damn sight quieter than standard motor's. I have done some testing with it and range and speed look's to be very good, accidentally shot myself with it and it damn hurt.

Let me know your thoughts guys
TopDart25

Welcome to BritNerf!

Looks really cool. I have only seen a few brushless motor replacements. The stock wiring concerned me, but then I remembered that brushless motors need an ESC (Electronic Speed Controller).

I highly recommend that the 14500 trustfires be replaced with a LiPo or equivalent power source. Trustfires have a high internal resistance, low capacity, and low current capability. In addition, the stock battery springs are a source of resistance in themselves. By going to a pack you get a much more current capable power source with a lower resistance connector (usually XT-60 or Deans).

Voltage is proportional to speed and current is proportional to torque in an electric motor (roughly). Current is important so that between shots the motors pick up to max speed before your next shot or if you need a shot quickly you can pretty much fire right after revving.

I like to think of it this way: if the motors were meant to be in an RC vehicle they should get an equivalent RC quality power source with RC grade wiring and upgraded switches (although since a controller is being used the upgraded switch isn't really necessary for this particular application).

Sorry this is a lot of information and I haven't even touched everything on flywheel blasters, but there are other members on this forum who are more knowledgeable on this subject than myself. If you have any other questions feel free to ask as you could probably tell I love electric blasters!
devilwood

Thanks For the reply topdart25.

That was my concern also. i was just thinking of using trustfire batteries because of the size and you wouldn't have to do much modding but that was only hoping. I have a few 3s lipo packs lying around that I may make fit either 3d print a new battery cover to accommodate for the extra size or make a battery attachment to fit on to a rail which may be good for quick release.

electronic wise all of the switches would be taken out as it will only need the power leads and 3 wire's going to a potentiometer from the controller.

does anyone know if the flywheel drive is the same in the rapid strike as it is in the stryfe?
TopDart25

Quote:
does anyone know if the flywheel drive is the same in the rapid strike as it is in the stryfe?


By "flywheel drive" do you mean the white wheel looking pieces that make contact with the darts (commonly referred to as flywheels)?
torukmakto4

Seconding the trustfire comments, all that AA stuff doesn't belong and needs to go in the trash. Nice work on the rest of it.

What are you using for a controller? I assume a RC ESC and a "servo tester" type circuit to send it speed signals? Can it do a relatively instant, full torque hard start of the motors? What is the response like (you will need to use a lipo to test this)?
devilwood

The brushless motors get up to full speed in a quarter of the time the standard flywheel motors do which isn't to bad to say there not sensored motors. Because of the size of the motors they don't seem to drop much rpm when darts are fired so it will give the blaster a much more consistant range and accuracy. The motors are 35A max and I'm using a single 80A plane esc which is well on top of its job then it has a servo tester. I am going to position the servo tester next to the esc and  re wire the potentiometer to move it down to the trigger on the handle that I will make a bracket to replace the standard switch.

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