TWiT Throwback (Audio)

We talk all about marketing your app -- freemium vs premium, why you should listen to your viewers, and how to make your app sticky.

Host: Tonya Hall

Guest: Ariel Michaeli

Producer: Tonya Hall

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Indian companies are dropping Zuckerberg's Internet.org, Snapchat is using its own app to steal employees from Uber, L.A. school district says Apple ripped them off and now they want a refund, and more...

Host: Mike Elgan

Co-Host: Lance Ulanoff

Guests: Saritha Rai, Kathleen Chaykowski, and Natt Garun

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How to make snow when there isn't any, XYZ 3D Printer, how to fix your GameBoy Screen, thrust testing quadcopter motors, our incredible sun, and more!

Thrust Testing

When we talk about how fast a multi-rotor can go, or how much weight it can carry, or how well it performs, a large part of the conversation is THRUST.

How much thrust can be generated by the craft?

The answer to that question depends on a few things:

Motor:

Look to Episode 117 of Know How...

Example:

Choosing your Motors:

This is a problem --- because other than the Kv, motors from different manufacturers don't really report their specs in the same way:

If you have a x250, then you're probably going to want a smaller, faster-spinning motor. Larger craft, like a x350, x450 or x525 will need larger motors, with more turns, that spin more slowly, but provide more torque, which you need for the bigger props.

Props:

Look to Episode 117 of Know How...

There are two variables to every propeller: Diameter and Pitch

Power:

Look to Episode 118 of Know How...

Example:

So we can give our motor a 3s (11.1 volt) or 4s (14.8 volt) LiPo to change performance AS LONG AS THE ESC/MOTOR SUPPORTS THE HIGHER VOLTAGE!

When we run high voltages, we go with smaller props.

To measure thrust we need:

These show notes have been truncated due to length. For the full show notes, visit https://twit.tv/shows/know-how/episodes/139

Hosts: Bryan Burnett and Fr. Robert Ballecer, SJ

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The ARRL Rookie Roundup, Tim Duffy is in studio with an announcement, reinforcing cables with Sugru, and more!

Hosts: Gordon West, George Thomas, Don Wilbanks, Valerie Hotzfeld, and Amanda Alden

Guests: Tim Duffy, Christian Cudnik, and Teri Grizer

Technical Director: Bryan Burnett

Editor: Victor Bognot

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Google's Internal Response to the Imminent E.U. Charges, Chrome starts pushing Java off the Web, find your Android phone from your desktop, demand for the Galaxy S6 is high, and more.

Hosts: Leo Laporte and Jeff Jarvis

Guest: Gina Trapani

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Hands on reviews Magisto Video Editor & Maker, Animoto Video Maker, Zoe, and Fyuse.

Host: Jason Howell

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Xiaomi buys Segway, Jerry Seinfeld calls YouTube a giant garbage can, an MIT Inventor lets me compare his PHD thesis to Uber, and more...

Host: Megan Morrone

Guest: Robert R. Morris, PhD

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Leo moderates the panel at Broadcast Minds at NAB 2015. Panelists include Marc DeBevoise, Sterling Proffer, and Robert Scoble.

Host: Leo Laporte

Guests: Marc DeBevoise, Sterling Proffer, and Robert Scoble

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iOS 8.3 is here with improved Siri voice and secret Spock Emoji! Charge your iPhone wirelessly with the Fuel iON Wireless Charging kit, read articles from your Twitter feed with Something, Product Hunt gets updated, and more!

Host: Megan Morrone

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EU vs. Google, the latest on preview builds for Windows 10 Mobile for phones, the Lumia 540 Dual-SIM, the BLU HD LTE, Surface 3 update, running Android apps on the Surface, Skype for business starts rolling out, Microsoft buys mobile BI vendor Datazen and more.

Hosts: Paul Thurrott, Mary Jo Foley, and Leo Laporte

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Check out Paul's blog at the thurrott.com.

Check out Mary Jo's blog at the AllAboutMicrosoft.com.

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