Thrust balancing will be harder now that they are now out to the side
They are balanced just as it happens with drones.
If you have one motor fails then how does the system balance that
The system identifies it and shuts off the twin on the other side, but you still have a decent power to land. If two on the same side fails at the same time (Very unlikely), the system shuts off the other two. In that case, it’s like having a typical single-engine paramotor.
Great design and concept. I’d love to see this fly. I have to agree with e-pusher thrust balancing will be more difficult as it’s further out from centreline. If you have thrust directly in centreline this is most stable. But I’m sure it’s not that big a deal. Only one way to find out right!
Curious why you chose to go with lipo instead of 18650 cells battery pack?
Thanks for the compliment!
thrust balancing will be more difficult as it’s further out from centreline:
The OpenPPG design is not centered as well, although the distance from one rotor to the other is not as far as my design. How do you guys handle the thrust balance?
“But I’m sure it’s not that big a deal. Only one way to find out right!”: You’re right, the process of developing a project is to build one, test it, corrections, test it, corrections… until you get it right (or give up if proves not worth it). I’m not trying to build something entirely new, far from it. I’m willing to try if the concept would, in fact, offer a nicer, practical and safer experience than what we have available today.
Curious why you chose to go with lipo instead of 18650 cells battery pack?
At the moment, I thought it would be easier to buy a specific LIPO battery (not really sure which one yet) for the testing phase and go from there. I have no doubt that some new generation of batteries is going to be available soon that will boost e-PPG a lot. They’re going to be lighter, safer, have more density, etc.
Exciting times are coming for e-PPG.
On a quad copter - done with gryos on the horizontal plane - cant do that here as this is not done up and down - I dont think gyros work left to right.
Gyro wont know if your turning or not – I think you will end having to correct steer like you would if your not putting out the same thrust - if your rpms are all matched than it should be fairly balanced with only minor correction needed.
Like you say the Oppg is not centered but not as pronounced, thus less effect if all thrust are not equal.
Cheers
I’m going that route as well. Getting 160kv motors for higher voltage. 14s. Probably 55ah pack.
You should consider going with lower kv motors and higher voltage, which will have less amp draw and less heat in pack. Most packaged ready to fly electric paramotors seem to be 16v or higher. But not easy to do with lipo’s seems like 6s is best bang for buck.
Our ESC’s are capable of monitoring RPM. That’s all you would need to detect a motor going out on one side.
Love the drawings and willingness to experiment! Welcome to the community 
Do you have a drawing of the unit connected to a wing? I’m curious how you would route the riser lines and how they would come up as you take off.
Thanks!
This is only true for the ESC’s, motors, and wires. The only thing that can reduce heat in the battery pack (of a given chemistry) is the capacity. With a given number of cells, If you arrange cells in a pack to have higher volts by having more in series and less in parallel each cell will still be producing the same amps to achieve the same total watts. Each cell has the same voltage as well.
I wish what you said was true because if it was I would make a really small high volt pack that would last only 5 minutes just to get to the mountain and soar without the weight.
Maybe these motors can be designed to unfold when you press the throttle and then snap in place. This could help to set up the wing first…just some wild thought… Also I like to see an attachment system for unpowered paragliding harness for those who fly primarily unpowered.
Cheers,
Marc
Hello Zach! Thank you for the reply.
The drawing I have at the moment is this one. While I was designing it, one of my main concerns was the riser lines. Take a look at the drawing and you can imagine how they are going to come up.
As soon as I have more details, I’ll post them.
Assembly.pdf (136.0 KB)
Interesting idea, perhaps I could implement that in the 0.2 version. 
It’s awesome if people come up with new ideas.
but in my humble opinion the existing paramotor designs are already working very well.
The main design flaw is that you can’t forward launch anymore.
I hate forward launch, but just yesterday I was trying three times to pull up my wing in reverse (facing the glider). It just did not work, wind was too slow.
I then turned around and did a successful forward launch (did I say I hate forward launches?)
But the main concern is that this is not about design, it’s about calculations. you may have way too much thrust with your setup. and too much thrust is a waste of energy (and weight).
did you calculate the thrust or airflow ? (not that I could do it…)
Yep, kinda of agree, but without exploration of the new ideas we dont know what could be better. Maybe OpenPPG has hit on the “overall” best design/layout. Some minor improvements to be made yes, like bats , but overall might stay the same. But how do we know until 20 or 100 people try to better it but are not successful. Maybe it will take the 1000th try by someone to come up with the next best design - pls keep trying is my vote and thank you!
With out effort, a path can not change.
Cheers
With the motor I almost always launch in totally dead wind. I finally mastered using the thrust to pop the wing up. I start with my lines slack, then I run until the lines are tight and the wing starts to come up, then I give it full throttle to pop the wing up. Note: the thrust doesn’t push me forward because it hits the wing so the wing practically comes up with very little forward motion. Just make sure your wing is part way up when you hit the throttle so the thrust doesn’t push you onto your face. You can feel the wing holding you from running… that’s when you know you can give it full throttle.
Yes - - I noticed this technique among the seasoned pilots.
This is a really interesting concept. Advantages over the current design are:
Less noise? Props are bigger and outside the wake of the body, so cleaner air? But the 2nd blade is in dirty air?
The housings might act as duct and improve efficiency due to loss of vorticies?
Drawbacks:
The wing comes up straight every time with this technique too. Without this teqnique I found myself aborting several times because I couldn’t run fast enough (with the added weight and without a hill) and the wing would fall over to one side or the other after running quite the distance just to get it all the way up above my head. It was quite frustrating!