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Old Aug 29, 2011, 12:01 PM
Xtreme Power Systems
Lake Havasu, AZ
Joined Jun 2005
15,755 Posts
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Skymaster 2M ViperJet

We have been working with Kenny McSpadden and Acme Jets over the last year to perfect the latest version of our fan system. Our new system is capable of sustained 20,000 watts even with high g-force loads. The main shaft now starts out as a 30mm diameter solid billet piece of tempered steel. That is turned down to 8mm, except for the very end which is turned down to 26mm x 6mm wide (an end plate), which is then drilled with counter sinks The shaft is pressed into the end bell and then 4 screws are used to secure the end plate directly to the end bell. This prevents the ability of the bell to wobble at all. There is also now a molded strain relief for the wires. We still are using 3 huge high quality Japanese bearings. The end result is a very reliable system that is able to take the place of mid-range (120N/130N) turbines. Our next focus is on a larger fan system (175mm) to power models in the 50 pound range with 160N size turbine performance.

Kenny flew his ViperJet at the Big Jolt this past weekend. He recorded a fast pass of 195.6MPH. This is a 33 pound 2 meter Skymaster ViperJet. It is normally turbine powered, and no attempt was made to save weight anywhere. This is just a direct conversion from a turbine aircraft to an electric aircraft.

John Reid at Model Airplane News was nice enough to donate the use of his high definition video camera and got some great on-board footage of Kenny flying around. That can be found here:

http://www.modelairplanenews.com/blo...ideo-coverage/

Here is a Youtube video as well.

video-2011-08-27-12-24-11.mp4 (1 min 9 sec)


As we find more videos that pop up, I will link to them in this thread.

Thanks to Kenny for being such a good sport, and helping us test our fan system!

UPDATE! Our production motors arrived today! The strain relief is rubber now instead of hard plastic (making it easier on wires), there are isolator barriers to prevent wiring chaffing during winding (no nicks can occur by accident now which happens sometimes with machine winding), the billet shaft cap is machined nicely with black screws, the collar retainer is used instead of a C-clip, making the shaft a full 8mm diameter. Other small changes were made for alignment in our hubs.
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Last edited by JimDrew; Aug 29, 2011 at 06:10 PM.
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Old Aug 29, 2011, 12:20 PM
EDF Jet Jam May 2014
Robert Belluomini's Avatar
United States, KY, Crestview Hills
Joined Dec 2000
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Can't wait to see it at E-Jets.
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Old Aug 29, 2011, 12:26 PM
Xtreme Power Systems
Lake Havasu, AZ
Joined Jun 2005
15,755 Posts
We won't be attending E-Jets. We will be attending Best In The West October 1st.
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Old Aug 29, 2011, 12:27 PM
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United States, CA, San Diego
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Originally Posted by JimDrew View Post
The main shaft now starts out as a 30mm diameter solid billet piece of tempered steel. [/url]
I think you need to go take a look at the descriptive words you are using above. The term "billet" and "tempered" don't belong in the same sentence. Billet steel is the raw unprocessed material that has no temper and must go though further processing. The temper or heat treating is usually the final part of the process after machining of the final part.


Steve Neu
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Old Aug 29, 2011, 12:30 PM
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That was fast and very impressive for such a large plane.
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Old Aug 29, 2011, 12:46 PM
Xtreme Power Systems
Lake Havasu, AZ
Joined Jun 2005
15,755 Posts
Steve, since when can you not machine a piece that is already pre-tempered? I was told that the tempering was done prior to machining to prevent a change in the material size that occurs during the tempering process. Perhaps you can check with our factory and let me know if the tempering is really done after the fact. If so, I will correct the statement above.
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Old Aug 29, 2011, 02:58 PM
Xtreme Power Systems
Lake Havasu, AZ
Joined Jun 2005
15,755 Posts
New controllers

Here is a real 30S production controller. Good for over 25Kw.
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Old Aug 29, 2011, 03:05 PM
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Tamjets's Avatar
San Jose, CA
Joined Jun 2006
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You been holding back from Jim...
I'll smoke you if give me one of those in my hand.
I'm mean smoke you in the speed run...not the other smoke.
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Old Aug 29, 2011, 03:08 PM
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San Diego
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One of my favorite jets to watch this weekend, Ken flew that jet like its meant to flown!!
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Old Aug 29, 2011, 03:14 PM
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United States, CA, San Diego
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Quote:
Originally Posted by JimDrew View Post
Steve, since when can you not machine a piece that is already pre-tempered? I was told that the tempering was done prior to machining to prevent a change in the material size that occurs during the tempering process. Perhaps you can check with our factory and let me know if the tempering is really done after the fact. If so, I will correct the statement above.

Truly hard steel is not nice to machine--it is usually ground to size.
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Old Aug 29, 2011, 03:15 PM
310mph Kolibri T25 Swist
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Sverige, Kronobergs Lšn, Ljungby
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Originally Posted by sneu View Post
I think you need to go take a look at the descriptive words you are using above. The term "billet" and "tempered" don't belong in the same sentence. Billet steel is the raw unprocessed material that has no temper and must go though further processing. The temper or heat treating is usually the final part of the process after machining of the final part.

Steve Neu
You need too look over your own designing skills before nagging on others :-/ you costed me alot of money already.
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Old Aug 29, 2011, 03:44 PM
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San Diego
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Originally Posted by JimDrew View Post
Here is a real 30S production controller. Good for over 25Kw.
Any chance of getting any data logging on it in the future?
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Old Aug 29, 2011, 03:49 PM
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Originally Posted by bri6672 View Post
Any chance of getting any data logging on it in the future?
it won't be necessary because it is proven to work at it's highest load.

NS.
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Old Aug 29, 2011, 03:54 PM
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Originally Posted by neversommer View Post
it won't be necessary because it is proven to work at it's highest load.

NS.
Looking for ESC temps, Battery Ripple, watts, RPM's, voltage readings etc. similar to what the Caslte setup does. Thats good data to have for fine tuning a setup...
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Old Aug 29, 2011, 03:58 PM
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Originally Posted by bri6672 View Post
Looking for ESC temps, Battery Ripple, watts, RPM's, voltage readings etc. similar to what the Caslte setup does. Thats good data to have for fine tuning a setup...
And you seriously expect this to happen with this ESC, bri?

You are right about to what you say..but I am not sure as this will happen with this ESC.

It looks like a modern chocolate bar.

NS.
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