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Member postings for Oldbaldfella

Here is a list of all the postings Oldbaldfella has made in our forums. Click on a thread name to jump to the thread.

Thread: First time electric gone wrong!
25/07/2013 07:59:02

Once again, many thanks all!!!

The 1050kv is now installed and successfully maidened yesterday.

There have been some staggering amounts of thermal lift down here recently which hopefully will continue.

23/07/2013 20:47:09

Thanks for all that.

I have just installed a 1050kv and a mate at the club has a watt meter which we can try so........

I have to say, the lower kv motor seems to be pulling much stronger. Weird! wink 2

Much obliged.

22/07/2013 13:37:23
Posted by Allan Bennett on 22/07/2013 08:44:11:
Posted by Oldbaldfella on 21/07/2013 10:10:29:

... I bought the Phoenix 2000 electric glider airframe from HK, a 1450kv brushless outrunner to power it, a 25-30a esc and a 1500mah 11.1v lipo. On the end of it is a 10" folding prop as supplied. ...

Thanks Allan.

Can I go back to ic, please?

You've got good advice so far, but you also need to be aware of the volt and amp rating of your motor. There's quite a few 1450kv motors around, and there may be some that can handle your 10" (10" by what?) prop on 3S supply. though lower kv would be better, as has been mentioned.

For any given motor, battery voltage and prop size (diameter and pitch) are the factors which determine how many amps the motor will draw. Usually you can get a good idea of the right prop either from the motor manufacturer's page (if they quote a range of sizes, and a range of volts, the largest prop will correspond to the lowest voltage), from calculators, or from other users. But you should always check your actual setup with a wattmeter, for manufacturing tolerances in motors and props can make a difference.

22/07/2013 07:50:39
thumbs upPosted by Frank Skilbeck on 21/07/2013 23:57:35:

I've also posted this link before, it's a free (yes free) motor/prop/battery calculator, if it doesn't have you exact motor in the database then just pick one with the same Kv you can then get an idea of the motor rpm and amps it will draw. I have found the results to be pretty close to actual readings on my combos.

But a 1450kv motor on a 3s lipo will be trying to turn prop at over 14,000 rpm, would be like having a pylon racing 40 in the nose of you electric glider.

21/07/2013 14:19:08

Many thanks

21/07/2013 10:59:01

Thanks Phil.

If I remember right, smaller kv for a bigger prop? What kv would you recommend for that size prop?

Cheers.

21/07/2013 10:10:29

Hi,

recently took the plunge with my first effort at putting my first electric powertrain together. Unfortunately all I ended up with was a smoking engine!

I bought the Phoenix 2000 electric glider airframe from HK, a 1450kv brushless outrunner to power it, a 25-30a esc and a 1500mah 11.1v lipo. On the end of it is a 10" folding prop as supplied.

Giving it a trial blast in the garden, not many seconds of full power resulted in a smoking engine. I do not believe they are meant to do that!

Where did I go wrong, please?

Thread: low and dangerous airshow
11/11/2012 09:20:20
Posted by Garbo on 11/11/2012 08:46:34:

I found it titillating and a little cheeky

thumbs up

Thread: This slope soaring sim is fantastic and free!
18/10/2012 08:05:16

Go for it with the WT! they are (from what I have learned on this forum) almost indestructible!

yes

Thread: Airshow pictures that you're proud of
17/10/2012 20:52:24

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img_1259.jpg

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ggg.jpg

Thread: The 'share your photos' thread (not model flying)
16/10/2012 18:16:28

Sally B at Duxford

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Thread: one for the nitro fans
13/10/2012 17:00:54

I love those x-jet guys thumbs up

Thread: The 'share your photos' thread (not model flying)
12/10/2012 16:00:01

The few week old Canon EOS 600d that took these pics is for sale in the classifieds........thumbs up

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Thread: Setting flap/elevator mix
10/10/2012 08:02:23

Sorry Phil, wasn't paying attention. Thought you had a T6J.

08/10/2012 21:26:33

Phil, I've done this one. If I remember, you have to use the rotary knob to do it.

I had the same problem trying to do it on other switches.

Thread: The 'share your photos' thread (not model flying)
08/10/2012 12:23:04

Many thanks.

08/10/2012 09:27:52

Sorry...off topic...but I have a camera for sale and wondered which section would be best to sell it in.

On topic, there are some very good pics on here!

Thread: NEW Red Dwarf!
04/10/2012 20:31:46

thumbs up

Thread: Hello from West Yorkshire
27/09/2012 15:40:53

Sherburn in Elmet may not be too far away.

Thread: The 'share your photos' thread (not model flying)
27/09/2012 14:49:05

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