Shortest Flights Ever!! โ๏ธ Freewing Gripen ...BIG FAIL!! ๐ฑ ๐
29These flights happened a long time ago, back when I had just upgraded my EDF system to an 8S jetfan setup (find details below). This combo is extremely power hungry and most lipos I had just couldn't cope with it, so I had a few nasty surprises. In this video you can see two consecutive fails where the jet had plenty of power to take-off then the batteries died (voltage sagged massively due to the extreme amp draw) and I was left basically powerleft with a brick of a plane in very bad conditions to land again. The first time I managed to come around and land the jet intact (although I almost hit a flagpole from the racer drones' circuit) but on the second I just didn't have enough energy or residual thrust and had to ditch the plane in the adjacent field. Not great, but the damage was really minor stuff. I fixed it, bought new batteries and kept flying ;)
Please, check my JAS-39 Gripen 'air to air' video!
https://www.youtube.com/watch?v=VIWycdTHZN8
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These were flights 78th and 79th on 'Jana'.
Pilot: RC4ever
DJI FPV pilot: Tuckie
Ground video: Luis Ibรกรฑez
Airfield: Club Els Cards
Music: YouTube Audio Library
SPECS (Reflecting my setup):
Model Scale: 1/9th
Wingspan: 882mm
Length: 1613mm
Weight: 2350g (w/o batteries)
TOW: 3400g
*CG: 40mm aft of factory recommended position (molded into the wings)
*Current CG is temporarily more nose heavy.
Material: EPO
Motor: HET-1865kv inrunner motor (added as a mod)
EDF: 9-blade 80mm Jetfan (added as a mod)
ESC: Freewing/Hobbywing Flyfun 150A 8S (added as a mod)
Servos: Stock servos on the canards, ALZRC DS452MG on TV yaw, JX servos on elevons, rudders and TV pitch. (added as a mod)
Landing Gear: Electronic retractable w/ aluminum trailing link struts
Receiver: FrSky X8R (user choice)
Gyro: Hobby Eagle A3S3 (added as a mod)
Canards gyro: GWS PG-03 (added as a mod)
Separate UBEC: Freewing 8A (added as a mod)
Receiver battery: Rhino 2S 610mAh (added as a mod)
Main battery pack:
- HRB 2x 4S 4200mAh 50C
- Turnigy Nanotech 2x 4S 3300mAh 70C
The jet is powered with an upgraded 8S 80mm Jetfan EDF with a 1865kv HET motor. I had to cover the cheater hole with a mosquito net to protect my expensive investment from an otherwise inevitable FOD considering the conditions of my gravel-dirt runway so the jet isn't even displaying it's full thrust potential. This obviously has an effect on performance and current draw. Sadly this setup is too amp hungry and can only get two and a half to three minute flights with throttle management and 3Ah packs. The batteries also struggle to deliver the amps, despite being Panther packs that are pretty heavy/capable. Overall the Jetfan is indeed an improvement in performance over stock setup, but the short resulting flight time kinda defeats the purpose, need to go to higher capacity batteries, and using lower-C packs to keep the weight in check.
More setup details:
https://www.rcgroups.com/forums/showpost.php?p=46318505&postcount=2099
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