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Old Jul 21, 2010, 02:30 PM
Xtreme Power Systems
Lake Havasu, AZ
Joined Jun 2005
15,938 Posts
New Product
New Dynamax Xtreme Fan System

Due to the problems we have had in the past getting the large motor from Little Screamers, we had no choice but to pursue other motor manufacturers.

We are replacing the current "Dynamax Xtreme" fan system with a newer, lighter weight version. This version is designed to handle 5000 watts continuously and 6000 watts burst. However, the reality is that this motor is very efficient and typically operates on 12 cells at under 100 amps, making the wattage in the low 4000 watt range.

The motor is integrated into the center hub. It is an outside-in design, meaning that it is an outrunner motor that is placed inside of a housing. There is a a special cooling fan inside that pushes air through the motor. Note: the screws shown in the photos are not the correct type, production units will have proper counter-sunk screws.

This new fan system uses an unheard of six bearing support system! There are two bearings on the rear, two bearings on the front, and two more bearings on the 7/8" long output shaft for the 11 bladed rotor.

We ran the fan continuously for more than 5 hours in the 115 degree F Arizona desert heat! The maximum temperature at the core was 230 degrees F, with the bearing temperatures about 160 degrees F. This is extremely cool compared to other outrunner setups being used in Dynamax fans!

Here are the numbers:

Motor type - outrunner with 8 poles, 12 stators
Motor Kv - 642
Total weight - 2 lbs, 4oz (should drop by several ounces with new rotor hub)
Cells - 8 to 12
Controller - 110A or more recommended


12 cells (XPS Platinum 45C)
--------------------------
Peak amperage - 96A
Stabilized amperage* - 90A
Peak RPMs - 27,110
Stabilized RPMs - 25,960


10 cells (XPS Platinum 45C)
--------------------------
Peak amperage - 84A
Stabilized amperage* - 75A
Peak RPMs - 24,731
Stabilized RPMs - 23,127


* After 1 minute of running

NOTE: Thrust is now equal to (and sometimes better) than the Little Screamer motor we have used in the past!


Retail price will be $439, availability approximately 30 days.
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Last edited by JimDrew; Aug 17, 2010 at 09:34 PM. Reason: Updated specs!
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Old Jul 21, 2010, 04:19 PM
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bri6672's Avatar
San Diego
Joined Jul 2009
2,288 Posts
AWESOME! I am on the list!!!! As soon as orders are ready let me know and I will get you guys paid, I am lovign this!!! So when you say low 4000's on 12s are we talking 4100 or what? And do you have any thrust #s yet on 12s?
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Old Jul 21, 2010, 04:32 PM
Build'em and Crash'em
Ken Lapointe's Avatar
Narragansett, RI
Joined Oct 2000
3,267 Posts
Jim, motor looks great. It would really help if the 12C and 10C numbers you list had the voltages for the amps, even if it was just the "stablized" voltage.

A picture without the shroud would be great too.
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Old Jul 21, 2010, 05:08 PM
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Joined Jul 2005
77 Posts
I have the Falcon waiting and the credit card warmed up.........EJets is calling
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Old Jul 21, 2010, 05:17 PM
Xtreme Power Systems
Lake Havasu, AZ
Joined Jun 2005
15,938 Posts
Voltage and amps depends on your cells, with the XPS Platinum packs we typically see 3.6v per cell under full load. That means 12 x 3.6 = 43.2v x 104A = 4492.8 watts peak. That tapers off and stabilizes to about 4000 watts.

Thrust is just a few ounces less than our our original setup with the Little Screamers motor. The weight savings of 1lb, 3oz. over the other setup more than makes up for that.
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Old Jul 21, 2010, 05:53 PM
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Chris Nicastro's Avatar
Post Falls, ID United States
Joined Feb 2004
4,378 Posts
Hi Jim,

I invite you to post data on this thread for a spreadsheet project I'm working on for everyones benefit. I sent your office an email earlier today but I just saw this thread.

http://www.rcgroups.com/forums/showthread.php?t=1278689

Great looking fan, now what do I use it in? Decisions-decisions...

Chris
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Old Jul 21, 2010, 06:18 PM
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bri6672's Avatar
San Diego
Joined Jul 2009
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So Jim, is it safe to say right at 15lbs of thrust (based on the same environment the big screamer was tested in)?
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Old Jul 21, 2010, 06:21 PM
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United States, CA, Mission Viejo
Joined Jan 2005
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The larger motor (20Kw version) will be available around the time e-Jets begins

Can you provide a little more input on this monster you mention?
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Old Jul 21, 2010, 07:05 PM
EDF all the way!
bruff's Avatar
Gilbert, Az
Joined Jun 1999
8,041 Posts
Jim,
Would this work in my PST Panther? I'm using the XPS Extreme fan on 12S in it now. I could save 2+ lbs. using this instead. The jet weighs in at 23 lbs now. Would drop down to 21lbs with new system.
Bob
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Old Jul 21, 2010, 07:06 PM
Watt me worry?
Madmax1965's Avatar
Florida
Joined Mar 2006
4,145 Posts
Sort of like my Hacker Turbo except you are using the fan center hub for the case..........good idea on using the hub. Is the motor a Hacker?.
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Old Jul 21, 2010, 08:16 PM
Xtreme Power Systems
Lake Havasu, AZ
Joined Jun 2005
15,938 Posts
Quote:
Originally Posted by bri6672 View Post
So Jim, is it safe to say right at 15lbs of thrust (based on the same environment the big screamer was tested in)?
It's actually closer to 16 pounds of thrust with the original motor as well as this motor.
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Old Jul 21, 2010, 08:17 PM
Xtreme Power Systems
Lake Havasu, AZ
Joined Jun 2005
15,938 Posts
Quote:
Originally Posted by Air Head View Post
Can you provide a little more input on this monster you mention?
Not yet. We have 10 more samples coming and we want to verify that they all perform the same before releasing pictures and specifications.
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Old Jul 21, 2010, 08:18 PM
Xtreme Power Systems
Lake Havasu, AZ
Joined Jun 2005
15,938 Posts
Quote:
Originally Posted by bruff View Post
Jim,
Would this work in my PST Panther? I'm using the XPS Extreme fan on 12S in it now. I could save 2+ lbs. using this instead. The jet weighs in at 23 lbs now. Would drop down to 21lbs with new system.
Bob
This would work, Bob. You would save 1lb, 3oz over the fan system you have right now. You could also get rid of the bigger controller and go with a lighter weight HV120 ICE or something like that.
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Old Jul 21, 2010, 08:19 PM
Xtreme Power Systems
Lake Havasu, AZ
Joined Jun 2005
15,938 Posts
Quote:
Originally Posted by Madmax1965 View Post
Sort of like my Hacker Turbo except you are using the fan center hub for the case..........good idea on using the hub. Is the motor a Hacker?.
We are getting the parts from a variety of companies.
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Old Jul 21, 2010, 08:49 PM
EDF all the way!
bruff's Avatar
Gilbert, Az
Joined Jun 1999
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Quote:
Originally Posted by JimDrew View Post
This would work, Bob. You would save 1lb, 3oz over the fan system you have right now. You could also get rid of the bigger controller and go with a lighter weight HV120 ICE or something like that.
Perfect!
Thanks
Bob
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