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Old Nov 13, 2011, 02:45 PM
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United States, IN, Greenwood
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HK TekSumo Configuration Suggestions

I'm purchasing an HK TekSumo as my first kit build, and I'm looking for configuration suggestions. I've read that the stock build is rather underpowered.

As my first kit build, I'm still a bit foggy on how motor sizes and prop combinations work. How can I tell which motors will fit the TekSumo mount? The stock build suggest a 1350kv motor, and when I look at the selection of those types of motors at hobbyking it's massive, with all kinds of sizes.

HK TekSumo: Stock build suggestion:
Quote:
15A~20A ESC
2208 1370kv or HK2818 1350kv Brushless Outrunner Motor
7x5 or 6x5 prop
800mAh~1000mAh 3s Lipoly Battery
Thanks for the help.
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Old Nov 13, 2011, 03:10 PM
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you will want one that weighs around 2oz or somewhere between 50-70g i would guess
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Old Nov 13, 2011, 03:12 PM
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here is the one they suggest http://www.hobbyking.com/hobbyking/s...dProduct=17588
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Old Nov 13, 2011, 05:00 PM
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Thanks Brosius, your weight suggestion sounds good for the stock battery suggestion.

I'm really looking for suggestions for a configuration with a bit more power. I understand there's a balancing act to do between the motor weight and the battery weight.

For example, in the FliteTest review, they had it paired with a Tower Pro 2409-12 1600kv, 30A Plush, 8x6 prop, and a 2200mah 3s lipo. However they also said it was pulling too much at 33A.

Also, I'm still curious as to how one determines which other motors will fit the TekSumo's mount. Is there a standard there?
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Old Nov 13, 2011, 10:22 PM
Crashomatic
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its plywood so it doesnt matter too much. in general you drill holes if they dont match.
you can get about anything in the 1000-2000kv+ range thats around 50-80gr as brosius pointed out
for each motor you have a different rating, depending on the prop.

bigger prop gives more thrust and draw more amps
smaller prop gives more speed and draws less amps

you basically want to balance it out. this will help you: http://flbeagle.rchomepage.com/softw.../webocalc.html (and this too http://fwcg.3dzone.dk/)

note that the 40gr one they recommend seems a tad slow. best would be to find someone whos happy with a slightly faster one.
whats tricky is to tell which motor+battery will get the CG just rite
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Last edited by CrashMeUp; Nov 13, 2011 at 10:31 PM.
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Old Nov 13, 2011, 10:31 PM
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Thanks for the simple explanation, I'll play around with that calculator and see what I find.
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Old Nov 14, 2011, 07:23 AM
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Quote:
Originally Posted by yarg View Post
Thanks Brosius, your weight suggestion sounds good for the stock battery suggestion.

I'm really looking for suggestions for a configuration with a bit more power. I understand there's a balancing act to do between the motor weight and the battery weight.

For example, in the FliteTest review, they had it paired with a Tower Pro 2409-12 1600kv, 30A Plush, 8x6 prop, and a 2200mah 3s lipo. However they also said it was pulling too much at 33A.

Also, I'm still curious as to how one determines which other motors will fit the TekSumo's mount. Is there a standard there?
only run a 7x6 or 8x4 prop on the tower pro 2409-12
Quote:
Originally Posted by CrashMeUp View Post
its plywood so it doesnt matter too much. in general you drill holes if they dont match.
you can get about anything in the 1000-2000kv+ range thats around 50-80gr as brosius pointed out
for each motor you have a different rating, depending on the prop.

bigger prop gives more thrust and draw more amps
smaller prop gives more speed and draws less amps

you basically want to balance it out. this will help you: http://flbeagle.rchomepage.com/softw.../webocalc.html (and this too http://fwcg.3dzone.dk/)

note that the 40gr one they recommend seems a tad slow. best would be to find someone whos happy with a slightly faster one.
whats tricky is to tell which motor+battery will get the CG just rite
bigger prop = lower Kv motor less amps more thrust
smaller prop = higher Kv motor more amps less thrust more pitch speed
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Old Nov 14, 2011, 07:46 AM
Crashomatic
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United States, CA, SF
Joined May 2010
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"for the same motor" that may indeed not be very clear
higher kv motors use smaller props and lower bigger props indeed. thats because higher kv = faster prop speed (pitch speed) (and thus higher plane speed too)

just trying to make it in a way that is understandable when you've never heard of this stuff.
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Old Nov 18, 2011, 02:03 PM
The art of airbrush
Österreich
Joined Jul 2010
83 Posts
After building and flying a TekSume today I can give you all a proven working setup:

1450kv Motor
8x6 APC Propeller
HK SS 25-30a ESC
9g digital servo
2200mAh 3s Lipo
To get a perfect COG you have to widen the precut battery slot a little bit to the size of the 2200mAh Lipo. That's all. The glued strap on plywood fits also.
The APC Propeller is used with the motor included collet style propeller adapter - you have to widen the hole a little bit with a reamer.
I use the FlySky 3 Ch Receiver for this wing with my Turnigy 9x.
1/2 throttle with this setup is more than enough for normal flight so you have enough reserve for speed flying.
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Old Nov 18, 2011, 05:27 PM
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Thanks for the suggestion!
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Old Nov 22, 2011, 04:13 AM
The art of airbrush
Österreich
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And this is the test pilot for our configuration after a successful flight - see his smile!!
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Old Nov 23, 2011, 06:39 AM
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hey nice radio tray
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Old Nov 23, 2011, 01:49 PM
The art of airbrush
Österreich
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Quote:
Originally Posted by brosius85 View Post
hey nice radio tray
It's homemade from plywood,foam,paint and some hardware. Errorwolfi (the guy on the picture) did the work. We have also a pdf plan if you like.....
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Old Dec 03, 2011, 04:35 PM
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What did you go with in the end Yarg?

I'm waiting to take delivery of my Teksumo, I've gone with two setups, as the motor I want is coming from the US, I've sourced the same power set as the Flite Test guys locally to tide me over.

1: Cobra C-2217/12, 30a ESC, 7x5 prop, 2200mah

2: Tower Pro 2208/12, 30a ESC, 8x6 prop, 2200mah

Should be nice a punchy

J.
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Old Dec 04, 2011, 05:54 PM
beemerdon
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USA, NC, Charlotte
Joined Nov 2009
803 Posts
I set up my new Tek Sumo today with the 2208/12 1800kv motor.The motor only weighs 41 grams with the mount so I'm gonna try to balance it with a 1300 3 cell. I tried the 1300 and it's not quite enough and the 2200 is a little bit too much. Also, I pushed the motor mount forward about an eighth of an inch as I was expecting this to be sort of tail heavy.

I'd like to have tried the 2409 motor but I broke the only one I had and they don't make it any more; great little motor!

I have a 7x6 prop on there but with the 1800kv motor I may try to find a 7x5 or even 4.

I am using Corona digital metal gear servos, my biggest splurge, as a guy told me cheap servos didn't do well on wings.

Don
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