High altitude props

[KillerSpud]

Has anyone tried drive more aggressive props for flying in high altitude locations? I live where it is at least 4500 feet asl, and can easily get up over 9000 if I take a drive up in the mountains. I’ve had significant gains when changing the props on my planes and I wonder if I could see similar benefits on my tri.

[Rustypaint]

The one thing I found is that the gemfan 6045 ABS will fail on 4s and snap off at the hub. My last crash was due to this so I’m sticking with the HQs.

[mjpilot]

Hi Killer spud. I recently went to the mountains and went for a hike with my mini tricopter. I flew from the top of the montain (10,000 feet) and wow it flew terribly. It needed about 20% more throttle and the tale wagged like crazy. According to ecalc, 7*4.5 hq props will give almost the exact same performance at 10,000 ft as a 6*4.5 prop at 500 ft. Hopefully the next time i go the the mountains i can test out the 7 inch props and report back.
link to 7in HQ props.
http://www.readytoflyquads.com/hq-prop-7×45-fiberglass-black-composite-prop
The video taken from the trip.
https://www.youtube.com/watch?v=Ks_K8fjZCwI

[KillerSpud]

Hmm, based on that I might try a set of 7×3 props. I just want to make sure none of my wires get in the way…

I looked at ecalc and can’t make heads or tails of it, so I’ll take your word on it.

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