Goblin

Introduction:

This is a wing I was always excited about. I'm putting on the same power train as the Dolphin, so it'll be great to compare their efficiencies.

Components:

  • Strix Goblin

  • JHEMCU Wing FC v2

  • VGood 60A 6s ESC

  • Sunnysky V3 2216 1400kv

  • Crossfire Nano RX

  • Beitian 220T GPS

  • DJI vista

  • JX PDI-1181MG servo

Conclusion:

975g dry. The initial maiden was on autolaunch which ended up in a crash that crumpled the nose and loosened up the wings. I did a manual launch after that which was successful. On 4s with the 2216 1400kv & 8x6 prop, I was able to get 60kpm on 4amps, 90kph on 8amps, and 100kph on 10amps. Overall, it felt smoother and a bit more stable in the air than the dolphin due to the longer wingspan, but it was definitely not as fast or efficient with the same motor and prop setup which I thought was interesting. Also, the durability is very questionable as I broke the main spar on a subsequent bad launch. I'm going to keep flying it after I order the replacement parts, but I don't think this will end up being a favorite.

Update 5/22/22: After breaking the main spar multiple times, I decided to remove the whole center section and reinforce it with two additional spars. After this, I encountered a crash into concrete that broke pretty much everything on the plane (including the tpu motor mount) except for the wing spars.

I also switched to a 7x6 prop and it seemed to perform more efficiently than the 8x6. On 4s, I was able to get 95kph on 8amps and 110kph on 10amps. With a 6s 21700 molicel, I can speedily cruise about 25km and still come down around 3.6-3.7v per cell. With all the upgrades, I'm starting to like this as much as the dolphin. I like the way it handles with the longer wingspan although I'm not convinced I like it more than the dolphin yet.

Efficiency Logs:

  • 21km (1739mah used) | 6s2p 21700 lion | 82mah/km - 7x6 prop fast cruising

  • 25.3km (1966mah used) | 6s2p 21700 lion | 77.70mah/km - 7x6 prop fast cruising 15.5min total (avg. 60.77mph)

  • 21.2km (1181mah used) | 6s2p 21700 lion | 55.7mah/km - 7x6 prop 14min total (avg. mph 56.4mph)