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Old Jul 05, 2002, 06:33 PM
Registered User
Austin, Texas
Joined Jun 2001
908 Posts
The new AC brushless motors on a piccolo or hornet?

Im not very good when it comes to motors but have any of you guys seen the new ad for the AC brushless motors that hobby lobby is selling? They say they are about the same size and weight of a speed 280 but have the power of a 480. Plus they have a cool looking Carbon fiber case (am i stupid or what). Anyways would this be suitable for a Hornet or Piccolo?
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Old Jul 05, 2002, 07:41 PM
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johntbyrne's Avatar
Vicksburg, MS
Joined Jan 2001
867 Posts
Hi Jason,

I believe there was some discussion about this motor some times back. See this link for more info.

http://www.nesail.com/AXI/miniac121520.htm

I don't know anything else about it. It does show 3000 rpm/v so it could work. Seems there was something said such as why get this when you could get a proven hacker for same money or something like that.

John



PS
http://www.nesail.com/AXI/miniac121516.htm
for 16 turn which can go 8 cells and give 3800 rpm/v. I've got to believe this would work.
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Last edited by johntbyrne; Jul 05, 2002 at 07:47 PM.
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Old Jul 05, 2002, 07:49 PM
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Vicksburg, MS
Joined Jan 2001
867 Posts
hmmmm,

Just noticed eff. numbers. I don't use brushless so I'm not an expert but I thought brushless should offer more than 78-79% efficiency. This is what the mini motors are rated. What does a hacker give?

JB
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Old Jul 05, 2002, 09:11 PM
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Maple Valley WA, USA
Joined Jun 2002
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A Hacker gives about 79-80% eff.
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Old Jul 05, 2002, 09:25 PM
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San Jose, CA
Joined Mar 2000
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The 16 will work on the Hornet will a 14 tooth pinion for CP, 12 for FP. Jim tested this setup. I'm just waiting from the manufacturer to release the heli version of the esc.
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Old Jul 06, 2002, 09:33 PM
ElektroRC.com - MSH,LAHeli,YGE
Pewaukee, WI, USA
Joined Mar 2002
4,608 Posts
When is the heli version being released? Looks like a good price for those controllers.

Anything else should do, like the Phoenix-10, etc... I may have to try one. The speed 300 in my Hornet finally died last week...
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Old Jul 08, 2002, 03:53 AM
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Belgium
Joined Sep 1999
143 Posts
I am using the 16 motor (kv 3800) in a CP Piccolo, and am very pleased indeed. On Seven nimh I am getting very good flight time, and more power than I need. I have finally got a cp piccolo that flies like it shou, the stock motors (295 & 310)were just too wimpy.

Rod

Piccolo CP conversion
Standard CP blades
Model Motors MINI AC1215/16
STandard plastic 9 tooth main pinion
Piccoboard with fifth channel (soldered direct to board)
Model Motors 8 amp brushless controller 08eľ3ph
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Old Jul 08, 2002, 09:10 AM
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wow, u got a motorwith 3,800 kv to work in your CP piccolo? are you using the 110 spur grear?

does that AC motor u are using create the need to modify the main chassis in anyway for it to fit on the piccolo?
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Last edited by petn7; Jul 08, 2002 at 09:50 AM.
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Old Jul 09, 2002, 08:58 AM
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Belgium
Joined Sep 1999
143 Posts
I am using the standard main gear and a nine tooth pinion, 110 teeth on the main might be better, but this flies fine, I calculate;

Piccolo gear ratios
Main gear teeth 100
Pinion teeth 9
reduction 11.11111111
Kv Motor 3800
Volts under discharge est. 7
No load motor speed 26600
Head speed at this 2394
required head speed 1700
% of KV at required head speed 71.01%
motor rpm at this speed 18888.88889

Looking at the specs for the motor on www.modelmotors.cz it looks like highest efficiency for the motor on seven cells is around 21.000-23.000 rpm, but the loss going down to 18-19.000 is relatively small 2 or 3%.

The main bonus for me is just to have ample power available, I am never using full throttle and hover at around 60%, at this level it is probably very close to optimum efficiency.

Rod
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