Recent content by Xrain

They make 12V -> 24V DC DC step up converters. You will have some efficiency losses (the one posted below is 80% efficient). But it will do what you want it to. Example: http://www.digikey.com/product-detail/en/VHK75W-Q24-S24/102-2268-ND/2162745 That definitely isn't the only one made there...

Usually your controller has to be set up for running sensor-less. A add on board to get the position information for the controller will end up being almost as complicated as the motor controller itself. This is because you need to know which two phases are getting driven with current and which...

You can definitely make an electric powered ducted fans. However I am not sure hiding them in the fuselage would help your aerodynamics all that much. I think the issue of having the make the entire fusalage larger might not make up for the drag decreases from not having the fans exterior on the...

Have you guys thought about using a small RC turbo-shaft engine to power the youfly? There are quite a few around, some can output 10KW or more. Like the ProX shown here, http://www.jakadofsky.com/htm_en/daten.htm It weighs ~8lbs, and you can run it for about 20 min off of 1 gallon of jet A...

Yea I am only referencing the bike part of the mass, the human part of the mass has many more factors involved in the equation. :wink: As with anything increasing something in orders of magnitude tends to have a significant effect. I am more referencing the trend in semi-competitive bicycling...

Well the only problem is you would need EDF's that are significantly larger to get the same amount performance out of that jet. Its all about the exhaust velocity, and the mass flow rate. Jet engines have a high exhaust velocity, with a moderate mass flow rate. EDF's tend to have a low(ish)...

20 A seems like a lot to send through a 3.5mm header, those are usually rated for ~7A or less. This seems like a hot water heater pump or something? If this is a prototype, I would recommend using off the shelf components, and just Jerry rig it together for your initial proof of concept. Even...

I've heard that adding 5 pounds to a bicycle is similar to taping a pencil upright to the handlebars as far as efficiency loss. If you are aiming for maximum speed in some respects its helps to add mass. This is because you will have more kinetic energy with the increase mass, so it will take...

I am still an advocate for using a standard cable throttle from a motorcycle, ATV, or snowmobile. Than running the cable down to near your controller, and connecting the cable to a pot box. Gives the most satisfying throttle to use, no battery voltage is near your hand, and they are...

That is most definitely the downside! On the upside, it will teach you to use safety glasses REAL quick. :wink:

Here are some options for the OP: http://www.mouser.com/ProductDetail/Mean-Well/SD-150D-12/?qs=sGAEpiMZZMtwaiKVUtQsNRU%2fEBWfzYNE4JWrTd3p8HA%3d http://www.mouser.com/ProductDetail/Mean-Well/SD-100D-12/?qs=sGAEpiMZZMtwaiKVUtQsNRU%2fEBWfzYNEdi1Mo6yaa1Q%3d...

I used a slugger saw for cutting sheet metal and such in a metal shop quite extensively for a few years. http://www.trick-tools.com/Fein_Slugger_7_inch_TCT_Circular_Saw_MCSL07_2181#.UmiYyuKsozA It was great for sheet metal and stuff up to a quarter inch, but I probably wouldn't spend my time...

Well the initial power conditioning circuitry that feeds the output channels (voltage regulation, smoothing etc.) could be the same, you could also use the same microcontroller so long as it has enough i/o pins and ADC's onboard for the double the inputs and outputs. There would just be 6 phase...

I think you mean brushless, for brushless controllers, as long as the power output is sufficient, the only real difference is that the controller for the two motors would have 6 phase outputs, and 2 sensor inputs (or 0 still if you want sensorless) If you were running brushed motors you would...

Brushless motors rely on accurate rotation signals coming from the motor. Since the motors are not physically connected they will fall in and out of phase with each other as they rotate, since each wheel naturally travels a slightly different distance every time you go over bumps, turn, or drag...