### Flying over sea with H2 hybrid powered drone

H2 Hybrid powered multirotor drone flying over sea from Penglai to Chang island in Shandong province, China.

H2 Hybrid powersystem introduction:

core weight:4kg;

output power:1.8kw/continuous,2kw/peak;

• @frederic reblewski

It is true that our current hybrid system is about 2kw, we chooose this power from practical consideration based current multirotor application. We also can provide bigger one if required. The mechanial design doesn't need many changes.

what you saw about the generator coil integration with engine is one of features of  H2 hybrid system,  and also remote start function with this only motor  is included.

H2 hybrid system includes a low capacity backup batteries for engine start and emergency landing.

The power density is about two times(including engine,motor,battery,fuel and all other components ) to current battery, and the practical application expense is much lower than battery.

thanks again.

• @zhanggi

with a small piece of paper, high school math and physics and a pocket calculator you can compute approximates for a lot of physical data!

my comment on flexibility was that your current system is about 2KW so, on one end, if the need is, say, 3kw there is no way to use the same system, you would have at least to change the engine hence some mechanical redesign, whereas with a battery system you can draw more the current or increase the voltage easily.

on the other end if the need is, say, 1KW the base mass of your system requires a longer flight to do better than a battery system.

I saw that the coil for the generator is integrated to the engine in what looks like a nice setup.

I saw also that your system is directly connected to the ESC, so no battery buffer or capacitor? that is interesting...

I assume that you can generate a range of voltages/currents through the coil design or some gears on the engine out axis or both...

2 hours flies use about 3Kg of gas, so the multi-copter is 3Kg lighter at the end than at the beginning. do you see a significant difference in the power needed?

• @frederic reblewski

very good, you estimation on fuel consumption is ver precise.

but your thought about the hybrid system is different from us, our system has great flexibility,  it is our most creatvie idea.

our H2 system can be used in broad power scope without any redesign and adaption, also this sytem is started and generator integrated, and withou any ac-dc,dc-dc power converter.

we will have a 20% power increase in next tech upgrade.

• @Huges

we use the tradional two stroke engine/battery hybrid power system, and Fuel cell we tested before showed low power density and high price, so we discarded it.

Our aim is to provide proper performance  price ratio hybrid power system.

we have taken great efforts on two stroke and wankel engine, but wankel engine is too expensive to be used, so we insist on two stroke gasoline engine.

• @Olivier

thanks, The flight controller is our own.

Vibration is just ok throuth our efforts.

• with a back of the envelope calculation, it should use around 2 liters of gas per hour, which means that durations above 15' benefit from that approach for that configuration. the main drawback is that there is little flexibility in the power that can be used. while you can add batteries to adapt to an increase of your motor power requirement, here you have to design a new hybrid system, and if you need less power, you need to consider longer flight to benefit from the system. but for the right system it is definitely the way to go for very long flights

• MR60

Nice. What fuel cell model/brand did you use ?

• What about using wankel motors instead of otto ones? Vibration levels would seriuosly decrease. Here are some samples in this size: http://www.barnardmicrosystems.com/UAV/engines/wankel.html
Wankel engine
• Very impressive specs, great work! Flight controller/stack?

You do seem to have serious vibration though, that's got to be one difficult to deal with problem with hybrid.