Archive for May, 2010

ETOP – Electronc Tethered Observation Platform

Israel Aerospace Industries has announced new Quadrocopter. They call it ETOP (Electric Thetered Observation Platform). It is a pure electric powered, Tethered airborne platform for observation and other applications. The ETOP uses cable from the ground to feed a HAV.

The ETOP can be deployed form a static or moving ground vehicle/station. The platform is generated by electric powered propellers which can hover at a predetermined altitude above ground for long periods depending on the ground platform energy storage capability. The ETOP can carry a payload of up to 20Kg to a maximum altitude of 100m. As long ground station station has power, the quadrocopter can hover. It should be mass produced in 2013. Supposed to be used by military units in urban areas.

http://www.iai.co.il/35510-41041-EN/default.aspx

Amazing quadrocopters


Quadrocopters do amazing things: turning upside down in the air, flying through window vertically and perching.

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EasyStar with 4S1P


3S1P configuration was slightly underpowered so, I’ve added one more LiFePO4 cell to the setup. It still doesn’t have 90 deg. climb, but it’s pretty fast now. I think propeller 5.5×5x5 should be increased up to 6×4. Anyway 50% WOT time it get’s about 9 runtime. It’s really not much, but with 4C allowed charging current, battery will be charged in 15 minutes, and that’s not so bad.

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Towards digital FPV

On RCGroups member announced, that he tested new digital video link, designed for FPV. “Rotoconcept Robotics” from Canada, has developed bidirectional 2.4 GHz link, which enables RC control and digital video transmission simultaneously. The details are unknown, but they are probably using OFDM modulation. Encoder and transmitter is about 12×13x4 cm. Right now it’s too heavey for models like EasyStar, but it was successfully used on quadrocopter. Right now company tries to make this device smaller. They promise not only digital video transmission, but also OSD and GPS functionality. Integrated computer gives a chance to use this system for FPV purposes. Despite that digtal video transmission get much criticism in the FPV arena, everybody agrees that in 5 years, this technology will be dominant due it’s high performance in quality and range. In this clip, you can see difference between 1W 2.4 GHz analog video transmitter (first part) and 50 mW digital video transmitter. The test was performed in 180 meters, non line of sight conditions. Analog video was constantly interfered, while digital link was consistent during all range.

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http://www.rcgroups.com/forums/showthread.php?t=1247779

Big wing EasyStar thermaled up to 2.3 km

This video was taken by Jumpjed101. Big wing EasyStar was sucked by thermal up to 2.3 km height and lost control. Once the pilot regained control, he tried to dive towards ground where he could get good reception. But such diving increases plane’s air speed and causes vibrations on the wings, which could break them. So plane had to be leveled back to decrease the speed, and the thermal lifted it once again. Thermals usually are not bigger than 300 m in diameter, so you can easily fly out of it. But this one was bigger and EZ couldn’t find it’s edge. Experienced pilot advise to turn the plane to your landing zone direction and roll the plane upside down. Wing’s lifting force will pull towards the ground and hopefully will overcome thermal lifting power.

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Great videos from Austria

Taken by Trappy

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Flight over iBėnai