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Old Feb 27, 2012, 05:02 PM
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Dr Kiwi's Avatar
Chattanooga, Tennessee, United States
Joined May 2003
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Keda TR2830/14 ~1630kv

9x5 GWS HD: 7.3v, 16.40A, 120W, 8460rpm, 40.1mph, 710g, 25.00oz, 5.92g/W, RPM as % of Kv x V = 71% (acceptable)

10x6 GWS HD: 7.2v, 20.40A, 145W, 7560rpm, 43.0mph, 802g, 28.24oz, 5.53g/W, RPM as % of Kv x V = 64% (over-loaded)
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Old Feb 27, 2012, 05:24 PM
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Deutschland, NDS, Oldenburg (Oldenburg)
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i always had good results with the apc e props. they give a good balance between amp draw and performance. and they have a good value for money...
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Old Feb 28, 2012, 07:24 AM
Specialist in Crashing
UK, Loughborough
Joined Jan 2004
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Thanks, I will probably buy a few props in that size area and see how they run.
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Old Feb 28, 2012, 10:30 AM
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Bristol UK
Joined Aug 2010
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2826/ 14

I've been running the 2830/ 06 (2250kv) on an out rigger air boat and got some pretty good runs with APC 6 x 5.5 untill sea water got the better of it.
I repaced it with the 2834/ 05 (2650 kv) hoping to get some better speed on a 5.25 x 6.25 or possibly bigger but was disapointed with the results.

I'm now thinking going back to the 2830/ 06 but have just been reading the results from the 2628/ 14.

I'm thinking that I should get better results with this on a 6x5.5 or even 6.5 x 6.5.

i know this is really pushing the motor but it is being used in a stupid 'who can go the fastest' comp so only needs to last a few runs with only 2 seconds or less full throttle per run.

Can anyone see a reason to go back to the 2830/ 06 rather than try the 2826/ 14. Peak Eff shows a slight performance increase in running the 2826/ 14, but i'm worried it'll loose too much power through heat or not have the tourque to turn the bigger pitched props?

The deign of the boat limits the prop size to 6.5 diameter max, the esc is limited to 30amp (40amp burst) and 3cells. Self imposed rules

Heres the boat running on the 2830/ 06 (APC 6 x 5.5)
Airboat for under £60 test runs (0 min 16 sec)


cheers
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Last edited by tim.fuggdesign; Feb 28, 2012 at 10:45 AM.
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Old Feb 28, 2012, 12:34 PM
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Manchester, UK
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Quote:
Originally Posted by saitrix View Post
Are the APC E series props the one to go for?
As you're in the UK; I prefer these, when they've got them:

http://www.giantcod.co.uk/sport-prop...ducts_name+ASC

They need balancing but so did every APC prop I ever bought. TGS usually means EMP - they weren't allowed to sell them by that name. At times it's been a clone of EMP but those seemed okay too.
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Old Feb 28, 2012, 12:49 PM
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i was never too happy with the emp/tgs props, have used several of them. when comparing tgs 5x5 to apc 5x5 i have a lot less amp draw with the apc but the tgs generates more thrust. for speed applications i prefer the apc. for sport flying the tgs should be allright.

you can get the tgs props very cheap over at hobbyking... for the smaller size props you pay less than 1 $ per prop...
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Old Feb 28, 2012, 12:49 PM
Specialist in Crashing
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Ahh I was wondering what props they were, thanks for the link and info!
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Old Feb 28, 2012, 01:03 PM
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I've only tried then from 8" to 10" so far. I haven't tried the little ones. I bought APC 4.1"x4.1" and 4.5"x4.5" (I think) for a friend, when I was ordering some stuff from www.micronradiocontrol.co.uk. Those looked good. I prefer EMP/TGS for the size I use though, and they're a lot cheaper.
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Old Feb 28, 2012, 01:17 PM
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Here is my contribution to the 5x5 EMP v. 5x5 APC E argument/relative merits.

The EMP draws a bit more, spins at the same rpm (thus same pitch speed if pitch as written on the blades are correct)... but generates a lot more thrust and more efficiently (g/W)
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Old Feb 29, 2012, 05:36 PM
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Deutschland, NDS, Oldenburg (Oldenburg)
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on my test system the difference between the 5x5 apc and 5x5 emp/tgs was a lot higher.

difference in amp draw was about 15%. i had no means to check the rpm back then, but maybe i will set up a new test bench next week after i finally finished my master thesis for university and then i will do a lot more tests with the new equipment.
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Old Mar 01, 2012, 09:33 PM
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United States, AZ
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Quote:
Originally Posted by eckace1 View Post
People buy cheap motors then rewind why? buy A good motor in the first place so you don't have to rip the guts out of it. Time is money in my book. Robert
Because they can....
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Old Mar 02, 2012, 03:35 AM
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Deutschland, NDS, Oldenburg (Oldenburg)
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Quote:
Originally Posted by eckace1 View Post
People buy cheap motors then rewind why? buy A good motor in the first place so you don't have to rip the guts out of it. Time is money in my book. Robert
also some people like to do some handicraft once in a while. and its such a rewarding feeling if something you made yourself works out the way it should, you can't buy that feeling with money... but with time and effort you can!
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