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Old Jul 12, 2005, 04:38 PM
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United States, NY, Hamburg
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New Project: 24" snappy on 3 cells with a razor m*killer!!

i put a razor 400 on my first snappy and now i'm smitten with it. so ofcourse i had to make a faster one. i'm planning on using another 24" snappy wing heavily reinforced with carbon. power will come from a TP prolite 2000mah 3 cell pack, a pheonix 25 controller and one of razors new m*killer 1/18 scale truck motors. kv for this little bugger is 6800 rpm. at three cells that's 85,680 rpm unloaded!!! thinking of using a gws 4x2.5 prop if it'll hold together. think it will or is 3 cells a bit much? now that i think about it, razor stators are only rated to 50,000 rpm huh? oh well, we'll test it's durability. tell me what you guys think.
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Old Jul 12, 2005, 06:28 PM
Striving to Rip the Bring
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What i think is that you are almost definitely going to fry that little motor.

--Alex
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Old Jul 12, 2005, 06:36 PM
"I passed on the kool-aid"
Waco, TX
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That sounds like a recipe for disaster....An expensive one at that. That motor is probably too hot for two cells.
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Old Jul 12, 2005, 08:12 PM
I just can't wait !
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I am using that motor on my custom 28 inch R/Cworks wing, I call it the howler monkey :-)


with a poly quest 1500 2s 20c pack 4x2 apc Castle 25 it pulls around 19 amps static full.

I can't tell you exactly how fast it is but it is crazy.
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Old Jul 12, 2005, 08:16 PM
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The quote from mfg's website is nice:
"RZ-MK (M* killer for cars) and HOT aircraft applications"
http://www.razormotors.com/htm/catalog/motors.htm
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Old Jul 12, 2005, 08:18 PM
I just can't wait !
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Quote:
Originally Posted by skylinux
remove

RZ-MK
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Old Jul 12, 2005, 08:47 PM
"I passed on the kool-aid"
Waco, TX
Joined Jan 2004
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I think when they said "HOT aircraft applications" they meant using it geared or on 2 lipo cells or less. If you give it a try you might want to get some eye protections because I do not think that GWS prop will last long not to mention that it will probably flatten out some as the rpm's get really high.
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Old Jul 12, 2005, 08:54 PM
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Haralson County GA. USA
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Quote:
Originally Posted by zmonte
I am using that motor on my custom 28 inch R/Cworks wing, I call it the howler monkey :-)


with a poly quest 1500 2s 20c pack 4x2 apc Castle 25 it pulls around 19 amps static full.

I can't tell you exactly how fast it is but it is crazy.
I sure it make a racket but dought if it is really all that fast. It is perhaps turning 35,000 which would be a prop pitch speed of 66.5 MPH. A decent CDR single on 3cells with a 4X4 can turm 26,000 for a prop pitch speed of 98.8.MPH.


Charles
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Old Jul 12, 2005, 11:11 PM
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If you are SURE you need to try this, at least go with a 3 inch or smaller prop.
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Old Jul 12, 2005, 11:42 PM
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United States, NY, Hamburg
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to be honest, if it blows up i'm really only out the motor, and they're on sale right now for like 75 bucks if i remember correctly. it'll be a BLAST i'm sure when i try it. one question i have is where can i get props smaller than 3" from?
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Old Jul 13, 2005, 12:03 AM
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Elk Grove, CA
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The 'go fast' motor for the 24" EPP delta Concrusher is a Himax 2025-5400 with a GWS 3 x 3 drilled out and CA'd to the shaft, and 3S1P TP-2100/s. There are several people who claim radar measured speeds in excess of 100 mph with this set up. See http://www.rcgroups.com/forums/showp...&postcount=433

MotoGuess says +50K RPM....maybe and maybe not, but is sure sounds fast. Mine goes fast enough with a Razor 300... maybe 75-80 mph which is still very fast for that small a plane. Woooosh and it is too small to see

Your limiting factor may not be over reving the motor, it may be trying to keep the prop on the shaft.
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Old Jul 13, 2005, 04:17 AM
I just can't wait !
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Quote:
Originally Posted by everydayflyer
I sure it make a racket but dought if it is really all that fast. It is perhaps turning 35,000 which would be a prop pitch speed of 66.5 MPH. A decent CDR single on 3cells with a 4X4 can turm 26,000 for a prop pitch speed of 98.8.MPH.


Charles
actually it's a 4.2 x 2 APC at 45,880 rpm with a total fly weight of 9.5 ounces ,and yes it is very fast would you like to run it :-) the GWS props hold up for the lesser razor motors that I run on mine other wings but start to collapse at these higher RPMs.
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Old Jul 13, 2005, 05:29 AM
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Haralson County GA. USA
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Quote:
Originally Posted by zmonte
actually it's a 4.2 x 2 APC at 45,880 rpm with a total fly weight of 9.5 ounces ,and yes it is very fast would you like to run it :-) the GWS props hold up for the lesser razor motors that I run on mine other wings but start to collapse at these higher RPMs.


Round RPMs to 46K , 46*2*.95=87.4 MPH prop pitch speed so still looks slower that a decent single CDR. My MiniSpeed Wing 250 is 10.3 AUW with CDR,3S TP ProlItes 1320 and tachs 26K with a 4X4 after a five minute flight with battery resting voltage at 11.3. There are a bunch of over 100 MPH small wings around these days.

Mini Speed Wing 250.

Being smaller the 250 seems almost as fast as this SpeedWing 400.


Charles
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Old Jul 13, 2005, 05:44 AM
I just can't wait !
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Quote:
Originally Posted by everydayflyer
Round RPMs to 46K , 46*2*.95=87.4 MPH prop pitch speed so still looks slower that a decent single CDR. My MiniSpeed Wing 250 is 10.3 AUW with CDR,3S TP ProlItes 1320 and tacks 26K with a 4X4 after a five minute flight with battery resting voltage at 11.3. There are a bunch of over 100 MPH small wings around these days.


Charles
Using a speed calculation chart for GWS props can be very deceiving, when I have tried the thin GWS props on this motor speed was greatly reduced, I would like to try a bit more pitch but I haven't found a fiber prop with a say 3 pitch the next step I found is a 4 pitch might be a bit too much. I don't know what the wattage and amp Max is for this motor.
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Last edited by zmonte; Jul 13, 2005 at 06:01 AM.
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Old Jul 13, 2005, 12:01 PM
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Cape Town, South Africa
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i saw a graupner cam 4x3 at my lhs
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