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Old Aug 14, 2010, 06:52 PM
Wonderfully Wicked
The Don's Avatar
Willoughby, Ohio
Joined Jan 2002
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I got 114 on the first pass and 120 on the second. Nice!!!

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Old Aug 14, 2010, 06:54 PM
Team 3DHS
wamsy55's Avatar
Nashville , Tennessee
Joined Jan 2009
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Wahooo ! Thats a lot faster than I expected ....
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Old Aug 14, 2010, 07:22 PM
DELTAS RULE
corsair nut's Avatar
tehachapi, CA
Joined Jan 2006
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thanks don. pack was probably cold on first pass not bad for 750W. i think my dads F-20 was faster today with the gear doors on, but hes got 3200 packs, and i think hes making closer to 900W. did ya happen to get a rpm off that don?
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Old Aug 14, 2010, 07:27 PM
Wonderfully Wicked
The Don's Avatar
Willoughby, Ohio
Joined Jan 2002
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Hold on I will go back and get your RPM. Give me a few minutes. 4 blade rotor correct?

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Old Aug 14, 2010, 07:33 PM
Wonderfully Wicked
The Don's Avatar
Willoughby, Ohio
Joined Jan 2002
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I get 44,700 rpm

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Old Aug 14, 2010, 07:43 PM
DELTAS RULE
corsair nut's Avatar
tehachapi, CA
Joined Jan 2006
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hmm. what rpm does the BI turn the full HET fan at? if i remember corectly, the arc motor turn the HET at 48-49K. only 4K less for 1/2 watts
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Old Aug 14, 2010, 10:56 PM
Wonderfully Wicked
The Don's Avatar
Willoughby, Ohio
Joined Jan 2002
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This is what I tested in the 6904 fan.

4S3000 20C lipo: 41,500 rpm, 810 watts, 58.18 amps, 13.92 volts
4S4700 25C lipo: 44,000 rpm, 950 watts, 63.88 amps, 14.87 volts
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Old Aug 17, 2010, 04:54 PM
Yup, gravity is still working!
Flying Frank's Avatar
Dark side of the moon
Joined Oct 2004
844 Posts
Hi Don,
This was the maiden flight so not sure I got an adequate pass for doppler analysis. If not let me know and I'll try and get better video........this is all I have at the moment. The pass is around 1:53.

Hope you had a good vacation.
Frank


L-39 new power system.wmv (4 min 3 sec)
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Old Aug 18, 2010, 10:20 PM
Wonderfully Wicked
The Don's Avatar
Willoughby, Ohio
Joined Jan 2002
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Sorry I could not doppler it because the throttle was chopped to soon during the pass
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Old Aug 19, 2010, 12:25 AM
DELTAS RULE
corsair nut's Avatar
tehachapi, CA
Joined Jan 2006
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interesting. so in a 65mm shroud, on a 2350 4s, im getting the same rpm as the full 70mm, but at a loss of thrust im sure. im only at 750W and about 52A or so. thanks for posting those numbers! BTW, do you have the rpm numbers for the 2w 20 in the het fan? i know at some point you compared them..???




Quote:
Originally Posted by The Don View Post
This is what I tested in the 6904 fan.

4S3000 20C lipo: 41,500 rpm, 810 watts, 58.18 amps, 13.92 volts
4S4700 25C lipo: 44,000 rpm, 950 watts, 63.88 amps, 14.87 volts
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Old Aug 24, 2010, 12:24 PM
Yup, gravity is still working!
Flying Frank's Avatar
Dark side of the moon
Joined Oct 2004
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Quote:
Originally Posted by The Don View Post
Sorry I could not doppler it because the throttle was chopped to soon during the pass
Don,
Thanks for trying. Will try and get better footage, preferably without any panning.
Frank
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Old Aug 24, 2010, 04:28 PM
Wonderfully Wicked
The Don's Avatar
Willoughby, Ohio
Joined Jan 2002
13,152 Posts
Hand held video camera panning makes essentially no difference so do not worry about that.
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Old Sep 05, 2010, 07:31 PM
BVM Viper Fever
pdawg's Avatar
United States, OH, Dayton
Joined Apr 2004
5,532 Posts
Hey Don,

Would you mind trying to doppler the pass at 1:05? The temp was 70. Thank you so much!!!
Tim's super fast Electrifly Rifle (2 min 23 sec)
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Old Sep 05, 2010, 09:05 PM
Wonderfully Wicked
The Don's Avatar
Willoughby, Ohio
Joined Jan 2002
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I got 136.

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Last edited by The Don; Sep 05, 2010 at 09:14 PM.
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Old Sep 12, 2010, 07:39 PM
BVM Viper Fever
pdawg's Avatar
United States, OH, Dayton
Joined Apr 2004
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Don,
Thank you again!
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