Miron Bogacki
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Bigger propellers on octocopter at the same size of frame

Started this discussion. Last reply by Miron Bogacki Sep 27. 15 Replies

Hi I have quite big octocopter with flat frame cinenestar type with 16" propellers and t-motor u7 420kv motors. It has 120 cm frame size. I would like to change the propellers in it to 18" to have…Continue

 

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Miron Bogacki replied to Miron Bogacki's discussion Bigger propellers on octocopter at the same size of frame
" When I will have same free time I will do the test ..."
Sep 27
Luc Maximilien replied to Miron Bogacki's discussion Bigger propellers on octocopter at the same size of frame
"Tested 7 years ago at the beginning of multirotor adventure, as I wrote : The overlapping will cause no problems but I doubt it will increase efficiency ."
Sep 26
Subatomic replied to Miron Bogacki's discussion Bigger propellers on octocopter at the same size of frame
"There was a research paper floating around on the net that showed with a ~10% overlap, there was a ~5% increase in efficiency. Don't hold me to those numbers. It was something like that. Unfortunately I don't have the link anymore."
Sep 26
Subatomic replied to Miron Bogacki's discussion Bigger propellers on octocopter at the same size of frame
"Why not do some testing with the original prop in the original configuration versus the "up/down" configuration, everything else being the same? Not only will you have your answer, but come back here and let us know what the results were.…"
Sep 26
Luc Maximilien replied to Miron Bogacki's discussion Bigger propellers on octocopter at the same size of frame
"Guess that 4 pair of good 18" propellers as T-motor are not cheap. Good Luck for your project !"
Sep 25
Miron Bogacki replied to Miron Bogacki's discussion Bigger propellers on octocopter at the same size of frame
"Yes but that's bigger weight and much bigger price for batteries I think ??? Are they better than tattu ? Do you have any link ? Can I have 12000 or 15000 batt in the same weight as tattu lipo ?"
Sep 25
Luc Maximilien replied to Miron Bogacki's discussion Bigger propellers on octocopter at the same size of frame
"In that case I suggest to switch to a different type of batteries , Sony Lion high C discharge , so you can go up to 20 minutes. "
Sep 25
Miron Bogacki replied to Miron Bogacki's discussion Bigger propellers on octocopter at the same size of frame
"hover is 70-80A"
Sep 25
Miron Bogacki replied to Miron Bogacki's discussion Bigger propellers on octocopter at the same size of frame
"yes"
Sep 25
Luc Maximilien replied to Miron Bogacki's discussion Bigger propellers on octocopter at the same size of frame
"I have done some maths , not with E-calc,  you should hover at 91,6A with a 6S setup . Are you using standard 20-30C Lipo batteries  with 3000 g of weight ?"
Sep 23
Miron Bogacki replied to Miron Bogacki's discussion Bigger propellers on octocopter at the same size of frame
"Octocopter weights about 13kg with camera and gimbal and batteries (2x10 000). It fly around 13 minutes."
Sep 23
Luc Maximilien replied to Miron Bogacki's discussion Bigger propellers on octocopter at the same size of frame
"The overlapping will cause no problems but I doubt it will increase efficiency . You can change by software the motor direction if you have black MK Esc or last version MK Esc,  if you have the red MK Esc it is not possible and you have to…"
Sep 23
Miron Bogacki replied to Miron Bogacki's discussion Bigger propellers on octocopter at the same size of frame
"Thanks for answers. I did calculation in ecalc.ch and checked the documentation of the motors so I know that on such configuration on flat octo if I will change propellers from 16: to 18" I will get extra 1 minute of flight time. My problem are…"
Sep 23
Luc Maximilien replied to Miron Bogacki's discussion Bigger propellers on octocopter at the same size of frame
"Going from  16" to 18"  depends also if you are actually with 4S or 6S batteries . Finally you will get a 10% more thrust if T-Motor chart correspond to reality but the propeller weights more so it will less than 10% and has more…"
Sep 23
Greg Fletcher replied to Miron Bogacki's discussion Bigger propellers on octocopter at the same size of frame
"You shouldn't need any kind of mixer as long as the Mikrokopter FC can be configured for an octocopter. As long as the motors spin the right direction relative to the frame, what difference would it make if the motors where pointing up or down…"
Sep 22
Miron Bogacki posted a discussion

Bigger propellers on octocopter at the same size of frame

Hi I have quite big octocopter with flat frame cinenestar type with 16" propellers and t-motor u7 420kv motors. It has 120 cm frame size. I would like to change the propellers in it to 18" to have longer flight time. I can use longer booms but the copter will be too big for my car so I am wondering about using the same booms but 4 motors up and 4 motors down like in the picture in attachment. Is that setting is as efficient like flat octo or I will lost same flight time like on coax setup ??…See More
Sep 22

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About Me:
Photographer and archaeologist from University of Warsaw. Personal page:
http://fotostacja.pl
Please tell us a bit about your UAV interest
building multirotors and using them for photography and photogrammetry
Hometown:
Warsaw

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