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I once managed 18 minutes on the Turnigy Nano-Tech batteries, but in all honesty...I drained those lipos much further than I am usually comfortable taking them. 12-14 minutes is a much safer flight time.

I am selling my 900mm VulcanUAV SkyHook; It's currently configured in Y6 format, but I have the other three arms available if you'd prefer to make it a flat-hex. This includes the 12mm rail mount system, dual-side battery trays and a quick-release for the included VX5N 2-axis gimbal. It...

Not with those props, no. They have a 6mm center bore which fits the 3508 motor without any adapter at all.

I'm using 12" wood HQ Props with Sunnysky 3508-KV700 motors. Sorry, I don't have any APC Slo-Flyers around the house to compare measurements. Good luck!

M2.5x5 should work just fine. And, yes, the M3x6 screws are what I used to mount the SunnySky motors to the extended arm.

No, the elongated screw-mounting slots do not cause the screws to vibrate. And yes, those mounting holes will work just fine on the AIMDROIX aluminum extended arms. I'm using Sunnysky 3508 motors with mine, they work wonderfully.

I haven't used the extended plastic arms, so I can't compare those against the extended aluminum arms. As for the aluminum arms vs. the 'stock' arms...there is some difference in video quality using the same gimbal for aerial video work. It's not a 'night and day' difference...just a minor...

I've never used them, but these don't look bad: http://www.rctimer.com/product_845.html (although, you may want to go with the smaller props and 'normal' arms while learning. When I think back to my early learning period, I can think of only one crash hard enough to damage an arm. I did...

I love my hex with the extended AIMDROIX arms, but I would definitely recommend using the cheapie plastic arms for your first multirotor. Even if you intend to do the vast majority of your flying in GPS and attitude mode, you should still learn to fly in Manual mode in case of emergency...and...

Are you using the T-Motor T30A Opto Pro or the T30A? Also, can you be a bit more specific than 'it does calibrate I thing'? I've not used T-Motor ESC's before, but a few minutes of googling found: http://fpvmanuals-1997231222.us-east-1.elb.amazonaws.com/graphics/Tiger-ESC-Manual.pdf On page...

Ok. Ideally, you should have the GPS mounted some distance away from the receiver and the Naza flight controller. I have mine atop a 6" folding mount (similar to http://www.rctimer.com/product_1030.html ) for example. Which direction is the 'arrow' on your GPS puck pointing? Also...what...

While loose screws could result in vibration, they are not the most likely candidate. Have you balanced your props and motors? Also, how are you mounting your Naza flight controller to your frame? How is your GPS puck mounted?

Also...Is your craft a quad, hex or octo? If it's a hex or octo, are you using a flat or co-axial configuration?

Century Heli will sell the top and bottom boards by themselves: http://www.centuryheli.com/products/productdetail.htm?prtnm=DJIF550CB

I'm glad to help! As haha49 noted, the sluggishness was being imposed by the Naza flight controller as part of its voltage protection methodology...since your settings were such that you were entering voltage-protection mode too soon, you would see the sluggish behavior even on the half-full...

Try the following: First level protection: No load: 14.80V Loss: 0.40V Loaded: 14.40V Second level protection: No Load: 13.60V Loss: 0.40V Loaded: 13.20V (Basically...first warning at 3.7V per cell, 2nd warning at 3.4V per cell, and assuming 0.1V per cell loss under load). Fiddle with...

You should ideally use 80% of your battery (2640 mA) before you come down. Again, what are your naza voltage protection settings currently? If your lipo protection is being triggered too soon, the expected behavior might be that your craft would become sluggish and won't accelerate without a new...

If you are using the DJI 30A Opto ESC's, you're limited to a max of 4S batteries. Those are the ESC's that I'm currently using with my F550 with Aimdroix extended aluminum arms. I recently upgraded to Sunnysky V3508-16 KV700 motors and 11" props and have been very happy with them. If I was...

In general, for efficiency you want lower KV motors running higher voltage and larger props. For 3S and max 12" props, your options are somewhat limited. If your ship will weigh 3000-3200g, you need a motor/prop combination that will lift generate 500-533g of thrust per motor at ~50% throttle...