HYBRID MultiRotor - Experimental
EXPERIMENTAL HYBRID MULTI-ROTOR
Experimental Quad, to test the concept of having major part of the lift, being provided by a different setup than the standard lift cum control motors of a multi-rotor .
We know that
1.Larger props are generally more efficient in generating lift
2.Currently, IC engines setups have better endurance than pure electric setups
The experiment was to test such a setup where the major proportion of the lift is provided by efficient large diameter, low rpm props.
In the initial setup, this lift generation would be driven by low consumption, low KV electric setup.. . In the next stage, the lift generating setup electric setup would be replaced with IC engine setup, for substantial increase in in range/duration and lifting capacity
Concentric contra-rotating props would have been ideal.. however, in the absence of a ready concentric contra-rotating gearbox, the option was to have two contra-rotating props suitability placed in a symmetrical manner.
The motor setup was
4 X 2212 1400kv motors with 7X4 prop.. these would be control motors
2 X D750 750kv motors driving 12x3.8 prop.. the lift motors
The 4 smaller motors were connected to a Flight Controller (FC in this case was a Naza Mlite) in the standard manner. The Rx outputs used were ch 1 to 6
The 2 lift motors were on Rx output ch 7 and 8.
Different setups were tried in Airframe, and lift motor control. The lift motor control setups were tried.. (having a OpenTX TX allowed to have the custom mixes)
1. ch 7 & 8 output was mapped straight to ch 4 ..i.e throttle without any changes
2. ch 7 & 8 output was mapped to the input from a pot in the Tx
3. ch 7 & 8 output was a mix (50/50) of ch 4 (throttle) and the pot mentioned in point 2
Airftame setup -A
All the airframe setups and lift motor setups were flown. Tests flights were done without getting into a exhaustive control of variables
Flying characteristics wise the best setup was Airframe setup B, C and A in that order.. B also had a good flight time.
A flight video of 1st setup
https://www.youtube.com/watch?v=5MBM_oSyyBQ&feature=youtu.be
Experimental Quad, to test the concept of having major part of the lift, being provided by a different setup than the standard lift cum control motors of a multi-rotor .
We know that
1.Larger props are generally more efficient in generating lift
2.Currently, IC engines setups have better endurance than pure electric setups
The experiment was to test such a setup where the major proportion of the lift is provided by efficient large diameter, low rpm props.
In the initial setup, this lift generation would be driven by low consumption, low KV electric setup.. . In the next stage, the lift generating setup electric setup would be replaced with IC engine setup, for substantial increase in in range/duration and lifting capacity
Concentric contra-rotating props would have been ideal.. however, in the absence of a ready concentric contra-rotating gearbox, the option was to have two contra-rotating props suitability placed in a symmetrical manner.
The motor setup was
4 X 2212 1400kv motors with 7X4 prop.. these would be control motors
2 X D750 750kv motors driving 12x3.8 prop.. the lift motors
The 4 smaller motors were connected to a Flight Controller (FC in this case was a Naza Mlite) in the standard manner. The Rx outputs used were ch 1 to 6
The 2 lift motors were on Rx output ch 7 and 8.
Different setups were tried in Airframe, and lift motor control. The lift motor control setups were tried.. (having a OpenTX TX allowed to have the custom mixes)
1. ch 7 & 8 output was mapped straight to ch 4 ..i.e throttle without any changes
2. ch 7 & 8 output was mapped to the input from a pot in the Tx
3. ch 7 & 8 output was a mix (50/50) of ch 4 (throttle) and the pot mentioned in point 2
Airftame setup -A
Airframe setup - B
Airframe setup -C
All the airframe setups and lift motor setups were flown. Tests flights were done without getting into a exhaustive control of variables
Flying characteristics wise the best setup was Airframe setup B, C and A in that order.. B also had a good flight time.
A flight video of 1st setup
https://www.youtube.com/watch?v=5MBM_oSyyBQ&feature=youtu.be
Flight video of 2nd setup
https://www.youtube.com/watch?v=j-HG5DfFrlU
Flight video of 3rd setup
https://www.youtube.com/watch?v=wFADahUsHmQ&feature=youtu.be
Flight video of 3rd setup
https://www.youtube.com/watch?v=wFADahUsHmQ&feature=youtu.be
Sir, This blog post has "original" content, in that you've carried out an indigenous experiment with beta testing etc. Such content is rare on the internet.There'll be many takes for it on the net. I recommend tabulating your data alongside, and publishing it. Great going. Please keep at it. Don't give up.
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