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Yes - each cell of a LiPo is about 3.7V so a 4S (four cell) is 14.8V and a 6S is 22.2V. For a motor its kV rating tells you RPM per volt, so with my 380kV motors: The 4S at 14.8V spins the props at 14.8x380 = 5,624 RPM (nominally - obviously that varies) The 6S at 22.2V spins the props at...

No, you don't need to do that. You really only need to recalibrate after you have made a change to the Phantom (e.g. added an FPV Tx) or if you are flying a significant distance from the last place you did a calibration (like, in the next state).

I've been thinking my ATTI gains are too high based on some other issues too so I'll see if I can get some flying time in later to make that adjustment.

Sorry - not quite sure what that means. I checked what you suggested but it all seemed OK.

This is an interesting topic that I thought a lot about before my current build (Pumpkinguy - you've seen my Tarot 650 thread). I'm a semi-professional photographer who knows the value of good equipment and I invest quite a bit in SLR camera bodies and lenses. However, even there I understand...

I just tried that - the motors seem fine. They all spun up and changed speed with throttle position as expected. No vibrations in the arms - these are brand new KDEs so they are nicely balanced. Checked the props too and they are perfect.

Today I was dialing on the gains on my Tarot 650 build (details here:http://www.multirotorforums.com/showthread.php?22168-Dual-Mode-(Hopefully)-Tarot-Ironman-650-Build). I felt like I was getting the gains where I wanted them but I did have an issue which caused some alarm: When doing a full...

There's another way if you want to spend a bit of money. I have a Futaba 14SG controller and I have programmed a mix on one of my dials that simultaneously adds rudder and aileron to make it circle around a point. They way I have it set up you can control the radius by how much you turn the...

Well, alright! That's 31 mins with the 17: props and 4S batteries - and SUPER quite: it's worth having that configuration just to hear it :-) That's the hover tests all done with - now to dial-in the gains properly - they are pretty close now. I'll also do some speed tests mainly to find out...

Ouch! Sorry to hear that. I am lucky enough to live on a horse farm so I went out into one of the pastures for an obstacle-free first flight!

I'm really trying to push my flight time, so longer flights means large, slow turning props (for efficiency). So, the 17"/4S will hopefully be my default configuration. However, I also need it to fly in pretty decent wind and large, slow turning props are just not agile. That means I need a...

Super happy - test of the 14" prop, 6S configuration has me at 22mins hover time at 80% battery capacity. Right on target! Now to test the 17"/4S config.

Yup - they had them: they are indeed in Florida. Thanks for the tip!

Does anyone know a good place in the US to get the Jeti anti-spark bullets?

I had a peanut gallery for the maiden flight....

It flies!! No hiccups at all - just started those lovely sounding motors up and popped it up off the ground. Hover looked really nice and stable but I do have to get the gains dialed in a bit better tomorrow and the battery thresholds are all wrong. But woohoo! My first build and so far so good...

Couldn't agree more - there's too much whining and not enough participation in the process, at least from the hobbyists. And that would be 100% consistent with pilot licensing and the way airspace is controlled. I think people fear that regulation automatically means restriction when that need...

There's something else to consider when understanding how the FAA (and other government agencies) regulate - they are very much in tune with commercial interests. I've been up against the FAA, GPS Industry Council and others when lobbying for changes to FCC radio regulations. In all these cases...

Here's the problem: there are too many people who think that knowing how to fly a plane/UAV/whatever actually makes you a pilot. It doesn't. When I got my PPL I soloed at less than 7 hours - that's the point when I could fly: take off, fly around, land - done, right? Then I spent the next 33...

A little nervous... ;-)