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Saturday 7/7/18

2018-07-07, 21:07 by Gary M Jones

I was at the field today between 14:00 & 15:00 all on my own , good flying too. There is a dead sheep along the fence line towards the gate from the pits, I saw the farmer so reported this to her. I hope no one had plans for a BBQ Smile .

Farmer …

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Post by Stubbsy on 2011-08-24, 16:49

Okay, heres the thing, basically I have now burnt out two motors in the last week - I think having too high a kv motor trying to swing too big a prop.
Are there any golden rules on prop/motor sizes, and which suits which size?
another quick question, apart from one spins inside and one spins outside, is there any major differences between inrunners and outrunners?
Cheers all
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Post by Tim on 2011-08-24, 16:58

Golden rule is buy and use a wattmeter Cool
The motor specs will usually give a guideline on prop size, but the most important thing is to not exceed the motor's maximum current (A), and the wattmeter will monitor this for you on the ground testing.

Most outrunners ( but not all ) will be lowish Kv and better suited to props, big and smallish, and most in-runners are higher Kv and better at spinning small props and edf. Generally speaking, outrunners have more torque than in-runners, and they are cheaper Laughing

PS remember that upping the cell count and therefore the voltage will increase the current considerably if you keep the same prop.

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Post by Guest on 2011-08-24, 17:02

Tim will be along soon and if you havn't got a Wattmeter like THIS he will slap your wrist and make you sit in the naughty corner Embarassed
"cross posting"


Last edited by Allan Warner on 2011-08-24, 17:04; edited 1 time in total (Reason for editing : cross posting)

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Post by Guest on 2011-08-24, 17:06

Tim! What no slapped wrist or sitting in the naughty corner - you going soft in your old age?

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Post by Andy Sayle on 2011-08-24, 17:22

You don't absolutely have to have a watt-o-meter, although they are quite useful when it comes to tuning a power setup.

You can go on what people recommend, tried and tested if you like Smile

Andy

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Post by Stubbsy on 2011-08-24, 17:42

Right chaps, will get myself a watt meter then - thanks for that!

Tim wrote:
PS remember that upping the cell count and therefore the voltage will increase the current considerably if you keep the same prop.
This explains the motor burn out yesterday! changed the jumper settings on the esc and swapped the lipo pack from from 2s to 3s but didnt reduce the prop size! Motor prop combinations C014
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Post by Tim on 2011-08-24, 18:33

LOL - pity you didnt ask the question BEFORE doing that Ben LOL

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Post by Stubbsy on 2011-08-25, 10:23

Story of my life - always too bloody late!

Watt meter, new engines and range of different size props winging their way to me as we speak!
Cheers for the help!
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Post by Andy Sayle on 2011-08-25, 10:39

Engines? You fitting an IC to it?

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Post by Tim on 2011-08-25, 10:42

Motor Mr Stubbs,,,,Motor. Very Happy

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Post by Stubbsy on 2011-08-25, 20:49

Okay okay - Motors I meant! Rolling Eyes
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