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Old Feb 14, 2012, 06:21 PM
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Efficiency test : hexTronik DT700 and 24 propellers - GWS 9x5x3 added

24 propellers: 10 APC, 2 EPP, 5 GemFan, 2 Graupner, 4 GWS and one HobbyKing.

Fixed parameters:
Motor: hexTronik DT700 11.1V, max 13A.
Batteries: Turnigy nano-tech 3S 4000mAh 35-70C, fully charged before each test
ESC: Hobbywing Pentium 30A - Timing mode: Middle
Turnigy Servo Tester and GWS Servo Tester MT-1
Junsi PowerLog 6S Wattmeter - LogView software - Soehnle scales
These measuring devices are not lab grade but are suitable for a comparison.

Tests have been made in two steps:
1 - Half throttle, most significant, usually used for hover
2 - WOT, maximum thrust and current
The Turnigy Servo Tester used has a fixed center position giving a 1.486ms pulse.
Max pulse is 1.976ms.

Graupner props were not as efficient as expected with this motor.
They have been tested twice to confirm.

Here is what I've got:



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Last edited by Mortimer; Feb 22, 2012 at 05:55 PM.
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Old Feb 14, 2012, 06:26 PM
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24 propellers:

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Old Feb 14, 2012, 07:47 PM
LoS sUAS AP/V is not a crime.
W,,,,,,,,,,,,,,,,,,,,'s Avatar
Grass Valley, CA
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Great job! Thank you for the useful information.
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Old Feb 15, 2012, 02:08 AM
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very good. Thank you. If you have a chance, can you try out Xoar wooden props too? they make 10x5 CW and CCW .
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Old Feb 15, 2012, 03:26 AM
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Do all the props tested come in CW and CCW to suit multi-copters?
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Old Feb 15, 2012, 05:01 AM
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Last edited by EndOfDays; Feb 15, 2012 at 10:08 AM. Reason: gone away, keeping the world perfect.
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Old Feb 15, 2012, 06:22 AM
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very interesting stuff and thank you mr M with those numbers i think i could plan a build rom a whole new angle now TY
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Old Feb 15, 2012, 08:02 AM
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Thank you Mortimer.Very good job.
may i ask two questions?

1-what about dt700 motors vibration?
2-what about differences with dt750?did you use any dt750?
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Old Feb 15, 2012, 09:28 AM
LoS sUAS AP/V is not a crime.
W,,,,,,,,,,,,,,,,,,,,'s Avatar
Grass Valley, CA
Joined Feb 2008
378 Posts
Knowing what RPM the said prop hits it’s thrust ‘sweet spot’ would be useful but to call Mortimer’s work ‘nut sure if this result is useable’ and ‘nice and interesting to do, but does not help’ is uncalled for.
He spent a lot of time getting these numbers for us, use them or go away.
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Old Feb 15, 2012, 09:38 AM
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Quote:
Originally Posted by Wayne Young View Post
Great job! Thank you for the useful information.
nothing is usefull. this stats does not make ANY sence in the real life flying.
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Old Feb 15, 2012, 09:57 AM
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Also GemFan has 12x4.5 version.
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Old Feb 15, 2012, 10:24 AM
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Quote:
Originally Posted by man1024 View Post
nothing is usefull. this stats does not make ANY sence in the real life flying.
well if a stupid person were to pick ANY of the above props then look at the thrust numbers and times them by four then build a quad to that weight wouldnt they then hover at center stick? while drawing 4x times the amp draw numbers? meaning they would know which lipo to pick to deliver needed amp draw while staying under a certain weight?

or

times listed thrust by 4 build quad lighter than number you get and know you have built something that DEFINATLY has enough thrust to fly?

looks pretty usefull to me
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Old Feb 15, 2012, 10:47 AM
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Great, very useful info

thanks for the efforts
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Old Feb 15, 2012, 10:50 AM
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Quote:
Originally Posted by n3m1s1s View Post
well if a stupid person were to pick ANY of the above props then look at the thrust numbers and times them by four then build a quad to that weight wouldnt they then hover at center stick? while drawing 4x times the amp draw numbers? meaning they would know which lipo to pick to deliver needed amp draw while staying under a certain weight?

or

times listed thrust by 4 build quad lighter than number you get and know you have built something that DEFINATLY has enough thrust to fly?

looks pretty usefull to me

Forgive me but I thought to FLY the weight should not exceed half of the thrust, i.e. 4 x 1000g (max thrust) = 4kg so craft should not be heavier than 2kg ALL UP WEIGHT inc battery, camera etc
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Old Feb 15, 2012, 11:20 AM
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Quote:
Originally Posted by TeeJayBee View Post
Forgive me but I thought to FLY the weight should not exceed half of the thrust, i.e. 4 x 1000g (max thrust) = 4kg so craft should not be heavier than 2kg ALL UP WEIGHT inc battery, camera etc
which is why the data is so good Mortimer did the 1st set of thrust numbers at 50% throttle the other set of numbers are at full throttle

so if you read his post then read my last reply using the 1st set of thrust numbers your good to go
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