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Old Feb 18, 2004, 10:56 AM
sal
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NSP (Vermont)
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New! MicRotex motors are here!

Got in three motors as samples to bring to WRAM Show!

I have some of the specs so here they are:
MicroTex 20/5/16
Efficiency max 79%
6A with max at 8amp
Rm .284
weight: 24 gms
Prop size 7 x 3.8-8 x 4

with 8 x 4 prop 280 gms thrust @7.8 A
with 7 x 3.8 prop 232 gms thrust @ 5.3 amps
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Old Feb 18, 2004, 11:04 AM
sal
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NSP (Vermont)
Joined Aug 2000
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MicRotex 20/5/18
Efficienct 79%
Max amps 6 with peak at 8
Rm .314 ohms
weight 24 gms
prop 8 x 4, 9 x5

With 2-li_poly cells
with 7 x 3.8 prop
325gms thrust @5.1 amps
with 8 x 4 prop
370 gms thrust @7.6 amps
with 9 x 5 prop 300 gms thrust @ 8.8 amps
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Last edited by sal; Feb 18, 2004 at 11:11 AM.
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Old Feb 18, 2004, 11:09 AM
sal
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NSP (Vermont)
Joined Aug 2000
2,695 Posts
MicRotex 20/5/14
24 gms
efficiency 79%
max amps 6 with peak at 8
Rm .192 ohms

2 cell-Li-poly
with 7 x 3.8 prop 232 gms thrust @ 5.3 amps
with 8 x 4 prop 280 gms thrust @7.8 amps

If anybody is able to convert these figures to Kv, Io and Rm (we know that one already)

I will give them a free MicRotex motor. This is the first person with complete and ACCURATE info. on all 3 motors.

In the meantime. If you want to see one come to our booth at the WRAM show this weekend.
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Old Feb 18, 2004, 11:43 AM
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ronrandle's Avatar
Huntersville, NC
Joined Jul 2002
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Sal those figures look very promising, I wish I could convert 'em as I would pop one of those on a plane in a heartbeat.

I'm having a hard time distinguishing between the 15 and the 14 as the specs look identical.

But what blows me away is the 18 with over 13 ounces of thrust on 2 cells with a 9x5 prop and 7.6 amps. That is incredible.

If I make up a few figures and they look good can I at least get a discount?? :-)

Ron
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Last edited by ronrandle; Feb 18, 2004 at 11:47 AM.
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Old Feb 18, 2004, 12:43 PM
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Olathe, KS
Joined Aug 2003
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sal what type of props...GWS, APC,...??? Also what 2 cell lipo...etec, kokam, tp...mah?
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Last edited by DrkSdeOTM; Feb 18, 2004 at 12:55 PM.
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Old Feb 18, 2004, 01:04 PM
DNA
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NE Ohio
Joined Jun 2001
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Don't know where Sal is getting his numbers, but they're not the same as what is listed on the Rotex web site. The site also lists the type of props that were used in the tests.

http://www.modelweb.cz/freeair/motory.htm
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Old Feb 18, 2004, 02:01 PM
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Laurel, Maryland USA
Joined Aug 2000
4,291 Posts
Sal: Why not just put 2 pieces of tape on the bell and use an RPM meter to find the Kv (divide the RPM by the voltage at the ESC), then measure the amperage with a wattmeter or Sears clamp meter on for the Io. That'd be super simple and take less than 5 min.

-Jim
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Old Feb 18, 2004, 02:18 PM
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USA, TX, Corpus Christi
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Prices please

How much for the 20/5/18? Nothing on your website yet, so when can we order?
jpflyer
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Old Feb 18, 2004, 03:33 PM
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Chattanooga, Tennessee, United States
Joined May 2003
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Hi Sal, I just sent you an e-mail in the hope of being one of the first in line for a 20/5/18. [Ordered February 2]

I am puzzled by the posted data for the 20/5/18 - how is it that a 9x5 at 8.8A is producing LESS thrust (only 300g) than an 8x4 at 7.6A (370g)? I assume, just from the 8x4 and 9x5, that those are GWS HD props?

Cheers, Phil
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Old Feb 18, 2004, 03:46 PM
DNA
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It says that they're $80 on NSP's web site.
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Old Feb 18, 2004, 05:17 PM
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Victoria, BC, Canada
Joined Apr 2001
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Those are numbers for the 20/8 series not the 20/5. So which one do you have?
And some the props are HD and others are SPC SF so they might not be comparable.

Rick.
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Last edited by rpage53; Feb 18, 2004 at 05:19 PM.
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Old Feb 18, 2004, 07:06 PM
DNA
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NE Ohio
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Nope, they're not the numbers for the 20/8/18.

Sal shows for the 20/5/18
With 2-li_poly cells
with 9 x 5 prop 300 gms thrust @ 8.8 amps
-----------------------------------------------------------------
Web site shows ----
For the 20/5/18
With 2 li poly cells
with 9 x 5 prop 250 gms thrust @ 6.0 amps

With 3 li poly cells
with 8 x 4.3 prop 350 gms thrust @ 7.7 amps
-----------------------------------------------------------------
For the 20/8/18
With 2 li poly cells
with 9 x 5 prop 220 gms thrust @ 4.12 amps

With 3 li poly cells
with 9 x 5 prop 310 gms thrust @ 5.6 amps
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Old Feb 19, 2004, 01:22 AM
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Helena, MT
Joined Feb 2003
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Sal - can you explain what the 20/5/15 is - that is the one that you have for sale on your website????

Are they / were they ever in stock? If not- when do you expect to have them - and which model specifically will be in stock soonest - and which model will be shipped to those that ordered the 20/5/15?

It seems that it would have been more honest to call that a pre-order rather than imply that they are a stocked item.

Please clear this up for us.
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Old Feb 19, 2004, 01:23 AM
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Also - can you please post the dimentions of the motor mounting shaft?
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Old Feb 19, 2004, 01:42 AM
Boffin
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Victoria, BC, Canada
Joined Apr 2001
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I just knew that the 20/8 was 79% efficient and the 20/5 was 75%. I guess Sal's motors are different then.

So Sal, we need rpm to be able to calculate MotoCalc parameters. Unless we guess about the rpm required to produce the thrust.
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