View attachment 2021Probably the most critical part has been missed here, and that is the weight of the prop. Model stability is linked to the response time of the thrust demand. It has been proved beyond any doubt that the prop.s that give the best lift efficiency do not produce the best stability. Props. such as the high aspect ratio XOAR's produce a lot of noise which means that they are not suited well to static thrust efficiency. Low aspect ratio blades with fine pitch angles perform the best. For the best profile section some startling facts emerged. In a world of insect aerodynamics where reynolds numbers are useless, surface finish also yields some interesting results.
1001copters.com [benchmark] motor and propeller test
- Thread starter 1001 Copters
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1001 Copters
Member
Hi DennyR 
In all my test, I measure the weight of the prop (it's indicated on the upper right corner of the data sheet).
XOAR prop are the lightest props available: even lighter than carbon props (XOAR 13x6.5: 20gr, carbon props 13x6.5 available on Mk.de: 26gr)
Wooden props are very very light, insuring fast response
In all my test, I measure the weight of the prop (it's indicated on the upper right corner of the data sheet).
XOAR prop are the lightest props available: even lighter than carbon props (XOAR 13x6.5: 20gr, carbon props 13x6.5 available on Mk.de: 26gr)
Wooden props are very very light, insuring fast response
Cedric
Really please to see your dedication to this aspect of research. When I have some spare ones available I'll send you a REAL prop. to try. This kind of blade can only be replicated in autoclaved carbon. Wet layup is far too heavy and does not have enough torsional rigidity. 11x4 12-14 grams. What we need to see from you is the response time from one lift value to the next.
Really please to see your dedication to this aspect of research. When I have some spare ones available I'll send you a REAL prop. to try. This kind of blade can only be replicated in autoclaved carbon. Wet layup is far too heavy and does not have enough torsional rigidity. 11x4 12-14 grams. What we need to see from you is the response time from one lift value to the next.
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1001 Copters
Member
Thanks a lot for the proposal DennyR
This kind of prop should be perfect but .. VERY VERY costly no ?
About the response time on couple motor/pop: I'm a specialist in measurments but not in electonics :/ If someone give me something ready to use to measure this response with accuracy I will do it with pleasure
Old man Mike as also requested me to do these measurments but It's out of my competences. (and I really don't have time to learn how to do it actually)
This kind of prop should be perfect but .. VERY VERY costly no ?
About the response time on couple motor/pop: I'm a specialist in measurments but not in electonics :/ If someone give me something ready to use to measure this response with accuracy I will do it with pleasure
Old man Mike as also requested me to do these measurments but It's out of my competences. (and I really don't have time to learn how to do it actually
)1001 Copters
Member
Hi
it's been a very long time but those who follow me on tweeter have seen that I was working on the AVROTO M2814-11S V3 test on the benchmark
The results have been published a few minutes ago on my website
It has been 18 props that have been tested, 4 days of hard work doing nothing else than measuring, analyzing, and preparing the datasheets but it's ok now
My conclusion: the XOAR 14x6 is the best prop in terms of efficiency for this motor. The AVROTO M2814-11S can easily replace an AXI 2814/22 in terms of efficiency, even if it's a bit less performant (very very close).
The vibrations needs to be fully tested on a dedicated bench. As the protocol has been changed between AXI aned AVROTO testing ( 5 second of measurments instead of two) we can't compare the vibrations results.
I hope these informations will e helfull for you
I want to thank Bart and Monto Rc: Bart told monto Rc to contact me for testing the motor and Monto Rc have send me two AVROTO M2814-11S V3 for testing and a bunch of propellers (that appears in this test).
So THANKS YOU BART and THANK YOU MONTO RC
it's been a very long time but those who follow me on tweeter have seen that I was working on the AVROTO M2814-11S V3 test on the benchmark
The results have been published a few minutes ago on my website
It has been 18 props that have been tested, 4 days of hard work doing nothing else than measuring, analyzing, and preparing the datasheets but it's ok now
My conclusion: the XOAR 14x6 is the best prop in terms of efficiency for this motor. The AVROTO M2814-11S can easily replace an AXI 2814/22 in terms of efficiency, even if it's a bit less performant (very very close).
The vibrations needs to be fully tested on a dedicated bench. As the protocol has been changed between AXI aned AVROTO testing ( 5 second of measurments instead of two) we can't compare the vibrations results.
I hope these informations will e helfull for you
I want to thank Bart and Monto Rc: Bart told monto Rc to contact me for testing the motor and Monto Rc have send me two AVROTO M2814-11S V3 for testing and a bunch of propellers (that appears in this test).
So THANKS YOU BART and THANK YOU MONTO RC
1001 Copters
Member
Hi,
I have changed my test protocol: first I was doing steps of 2 seconds from 30 to 250 gaz but now I'm doing 5 seconds steps from 30 to 200. a 5 sec step is VERY stressfull for the motors after 200 gaz. For example we rech more than 20 amps on the avroto at 200 gaz. 5 more steps mean 25 seconds with very high current inside the motor and controler. This can lead to destuction of both. (and as I'm not earning money with these tests, I don't want to waste money to buy another single motor or controler ^^)
I have changed my test protocol: first I was doing steps of 2 seconds from 30 to 250 gaz but now I'm doing 5 seconds steps from 30 to 200. a 5 sec step is VERY stressfull for the motors after 200 gaz. For example we rech more than 20 amps on the avroto at 200 gaz. 5 more steps mean 25 seconds with very high current inside the motor and controler. This can lead to destuction of both. (and as I'm not earning money with these tests, I don't want to waste money to buy another single motor or controler ^^)
1001 Copters
Member
Thanks a lot for the compliment Mr Anaka
I will pass the AVROTO to 5S LiPo now.
next motor wil b AXI 282014 and Mk 3638
Then AHM 36-6
Before buying other motors I have to pass these one on my test bench (and the 160€ of a Plettenberg isn't a piece of cake...)
I will pass the AVROTO to 5S LiPo now.
next motor wil b AXI 282014 and Mk 3638
Then AHM 36-6
Before buying other motors I have to pass these one on my test bench
(and the 160€ of a Plettenberg isn't a piece of cake...)