Update:
Before 'risking' a GoPro and adding weight, I installed a keychain camera that I got of eBay (beware of fakes). It is a 1280x720 808 #16 v2 that has video out while recording. I feed that into a Boscam 5.8 gHz transmitter.
Total weight at this moment ~800 grams (with the FPV setup, battery and all, apart from the props ..) pretty pleased.
Today I also added an orientation helper (will have to see what it does in daylight
): a few LEDs with a resistor in series so that it uses around 20mA with the 3S setup.
Something I learned (
advice to novice builders such as myself): I thought it would be easy to get the "battery to 3 pairs of bullet connector breakout cable" . That is indeed nice if you
don't plan on using any extra gear. Once you decide even to add something simple as a few LEDs, the KK2 voltage alarm or as mentioned earlier some FPV transmitter you find out this neat setup leaves you with a nice closed system with no power 'outlets' to connect your nifty additions.
So, if you're starting out in building a tri and anticipate on adding anything in the future, go for the "battery to
4 pairs of bullet connector breakout cable" (nearly no extra cost). You can start out with the 3 pairs and use the 4th lead to power (3S compatible!) add ons later on, using some bullet connectors.
Ah, so today I added an orientation helper: some LEDs with a resistor in series on the tail: