Anyone know of any inexpensive devices for planes that could possibly track speed, altitude, g forces etc?

Perhaps something that could be connected to a computer later on via usb and upload multiple flight data.

Kinda new to advanced rc stuff.. so I wasnt sure if they exist (for a reasonable price) or what their exact name is..

Side question: how do most people gather data such as MPH.. via radar guns? Arent these pricey for long range ones?

What sort of device can measure both the watts put out by a power system and the thrust generated? (just a plain old watt meter)?

Thanks