You see that at around 0.2m blade length a HAWT will generate 40W at 28 mph wind. 28 mph is "Strong Breeze", according to the National Weather Service and in which you probably really don't want to be camping.
Strong Breeze = "Large branches in continuous motion. Whistling sounds heard in overhead or nearby power and telephone lines. Umbrellas used with difficulty."
But when you get down to 15 mph (moderate breeze) it's only making 6 watts, and at 8mph (gentle breeze) it's making 1 watt.
That is assuming steady wind to think you will get that continuously, derate accordingly.
I suspect there will be some gap between expected and actual performance for many people.
12,000 mAh internal battery
There's no mention of voltage but it looks like it uses USB connectors, so let's assume 5v. This turbine running at full-load (with NO losses)
40w @ 5V = 8A (maximum theoretical)
8A * 1.5hrs = 12,000mAh (1.5hrs minimum theoretical time needed for a full charge.
Now divide everything by 1/3rd for better 'real-world' (aka pessimistic) numbers.
13w average output
13w / 5v = 2.6A
2.6A * 4.5hrs = 11,700mAh
So really not that bad, but most of the time I'm camping the trees block 95% of the wind. On the other hand that other 5% does seem to happen more then 5% of the time. =)
Here's the fundraiser site where it gives more details: https://www.indiegogo.com/projects/shine-a-wind-turbine-that...
Using the existing principles of tensegrity applied to self-supporting tents, this could have enough surface area to run the generator at maximum in a gentle breeze, with some possibility of trimming in actual wind.
It would be a completely different product but it's not an implausible one.
Edit: I'm thinking vertically mounted with three 'jib' sails which are constrained on (let's say) the clockwise side, these would take turns catching the wind, then relax into the leeward and snap over onto the bar when returning to windward.
The other thing is it doesn't say how noisy it is - bet you it's pretty annoying if it is making 40W, probably even at 15-20W.
It's heavy for most recreational activities, but it might be great for expeditions. If it could be made very durable, it could be beneficial for superdeep cave exploration. In such environments there is no light, but often there is rushing wind and water. There is also a critical need for power to keep lights running. While charged batteries can also be brought in from the surface, they have a limited lifespan in the cave, and an expedition therefore needs a continuous supply of fresh batteries to continue.
Neat idea but unless you are within 3 miles of the coast you're unlikely to see wind speeds above 6mph in your area for any sustained period of time.