New Dynamax Xtreme Fan System - Page 4 - RC Groups
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Jul 26, 2010, 10:36 PM
Originally Posted by Air Head
Sorry Jim but I still cant find anything close to 20KW.

I think id be happy with 10, and the 14 cell 200 amp controller should do that, but its only a little past 10KW.

If your making a 20KW motor what do you plan to use to spin it ?

200 amps needs 100 volts to get the 20KW
There will be controllers!
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Jul 26, 2010, 10:36 PM
Originally Posted by Arngeir Blakseth
Another solution for high power would be to make the motor with a higher Kv accepting a higher amp draw and use a 14S 300A controller, that would be good for 15-16kW. There are a couple of those controllers available on the market now (Schultze and Jeti) so no need to wait for vaporware controllers to run the fan unit. Large 2P or 3P batteries needs to be used (10000-15000mAh), but that's just what the large 3D/acrobatic plane guys are doing and have been doing for some years. If it works for them it should do so in a EDF as well.
In the real world, it doesn't work that way! You must use the Kv that matches the load at the peak effiiency.
Jul 26, 2010, 11:19 PM
Senior Member
Arngeir Blakseth's Avatar
Don't tell me that a Kv of 650 is the only one that a motor can have to spin the Dynamax at max efficiency. I'm sure you could design a motor with a Kv of 750 to do the job just as good if that was one of the basic design parameters for the motor. It may end up with a different length or diameter but what would be the problem in doing this?
Jul 26, 2010, 11:27 PM
Renegade Fun Forever!!
rvincent's Avatar
Oh but that's not so AB. Every fan has a peak efficiency and runs best at a given rpm. Now consider esc's and batteries. I think as battery technology gets better we may find that 680 might be a peak kv for the dynamax and still be a usable fan for the average guy. Now if you are buildind a dedicated racer (like I am), then a higher kv is not only desirable but a must. But this is a plane that will fly for 3 minutes tops. Not what most are in the market for.
Jul 27, 2010, 01:22 AM
Peak efficiency for the Dynamax and a 63mm motor is actually about 645kv. Our new big motor is 676Kv. It is slightly larger than the original 63mm motor so it can handle more load with the same power. Really do have to tune the motor for the load.
Jul 27, 2010, 07:54 PM
Living the dream
flyarmy58's Avatar
Im just ready for the small motor setup,haha Mike
Aug 03, 2010, 02:03 AM
Registered User
bri6672's Avatar
Hey Jim any updates on the Dynamax Xtreme?
Aug 03, 2010, 02:53 AM
They are in production. We will have units available before the end of the month.
Aug 03, 2010, 04:16 AM
Registered User
Got my name on the list yesterday Is there anyone else in the UK using an XPS Dynamax or am I gonna be the first?
Aug 03, 2010, 02:48 PM
We have sold 1/2 of our fan systems to Europe/UK, so there are definitely people using them there!
Aug 03, 2010, 02:52 PM
Registered User
bri6672's Avatar
Im starting to make some progress on my Yellow F-18 I cant wait for this fan!!!!!!!!!!!!!!!! SOOOOOOOO Excited
Aug 03, 2010, 11:58 PM
Lookout For The!Radio Silence.
wingspan100's Avatar
I see progress and a better future!
Aug 17, 2010, 05:25 PM
Registered User
bri6672's Avatar
Any updates yet?
Aug 17, 2010, 09:19 PM
Parts are on there way to us for building the smaller (6Kw) setup. We will have production of the new larger (20kw) starting on October 1st.
Aug 19, 2010, 04:16 PM
Living the dream
flyarmy58's Avatar
Just so I know, the smaller (6Kw) would fit my Byron F-16, correct? Thanks, Mike

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