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Old Aug 12, 2011, 05:46 AM
Team30 Micro EDF
NitroCharged's Avatar
Adelaide, Australia
Joined Apr 2004
11,199 Posts
Battery Eliminator Circuit - BEC ... means you don't need a separate battery to power your receiver with 5V.
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Old Aug 12, 2011, 06:04 AM
Life begins at transition
Australia, VIC, Sale
Joined May 2007
3,593 Posts
NC - what speed are you expecting?
If it's 100ish, that'll give my F16 a run for it's money - crazy!!
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Old Aug 12, 2011, 06:14 AM
ancora imparo
jj604's Avatar
Melbourne, Australia
Joined Jul 2005
6,405 Posts
Yeh, and if I remember correctly you got slammed on the forums by some expert that proved theoretically that wouldn't work under any circumstances.

There's no sadder sight than to see a beautiful theory ravished by a gang of marauding facts...
Quote:
Originally Posted by NitroCharged View Post
John, I also stack the regulator if I use more servo's so it doesn't fry. I simply solder another on top of the first to share the load.
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Old Aug 12, 2011, 02:47 PM
Avionics tech
52Sabre's Avatar
United States, MI, Grand Rapids
Joined Jun 2011
2,293 Posts
Thank you!

Thanks for all the info and great advice you folks have provided me these past few weeks. You've got me back in the air (after 19 year absence) and have educated me about this new fangled world of electric R/C flight! 20 years ago the Goldberg Electra was about it with a heavy 2x6" brick of nicads. Wow! Times sure have changed. I look forward now (with confidence) to many enjoyable hours with the hobby. thank you again
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Old Aug 12, 2011, 03:57 PM
Richard Cox
Thousand Oaks, CA
Joined Dec 2003
650 Posts
BEC is an acronym for Battery Eliminator Circuit. It is nothing more than a regulator in the ESC that supplies usually 5 volts for the receiver and servos. They usually only supply enough power for 2-3 servos, except in larger ESCs. Many times an external BEC is used to power the receiver and servos, since they can supply more current when needed.
A switching BEC, which most are, are much more efficient at converting the battery voltage to 5 volts without producing a lot of heat.
A BEC in an ESC will overheat and shut down if the power exceeds it's capability. When that happens, your receiver also loses power and bad things happen.
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Old Aug 12, 2011, 10:10 PM
Team30 Micro EDF
NitroCharged's Avatar
Adelaide, Australia
Joined Apr 2004
11,199 Posts
Unofficial speed result for Mig 15 = 82.7mph!!!

Quote:
Originally Posted by Odysis View Post
NC - what speed are you expecting?
If it's 100ish, that'll give my F16 a run for it's money - crazy!!
Odysis Dopplered me this morning at 82.7mph using the iphone rcspeedo app.

It took quite a few runs to get it as the fan is pretty quiet.

I'll do another run tomorrow morning on video for POF and Official Doppler readings.
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Old Aug 12, 2011, 10:16 PM
I don't want to land yet!
Joined Jan 2010
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Yup, she is very quick and quiet for such a small jet
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Old Aug 13, 2011, 08:25 AM
Registered User
Joined Jun 2011
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Hi guys!

Where can i get a new impeller? I found one at sydneyrcjets, but $7 + $35 for shipping is totally insane when the whole plane costs 50 bucks.
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Old Aug 13, 2011, 02:27 PM
Avionics tech
52Sabre's Avatar
United States, MI, Grand Rapids
Joined Jun 2011
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Zebb - same deal here. Hoping if we talk nicely to our Oz friends they'll slip a couple in an envelope. letter postage?
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Old Aug 13, 2011, 02:45 PM
CV-15 VB-16
giuseppi's Avatar
USA, TX, Friendswood
Joined Jul 2007
1,372 Posts
I don't know of anyone more knowledgeable than Nitrocharged about small EDFs and he suggested a cut down GWS 40mm rotor as a replacement in this earlier post to chads:

http://www.rcgroups.com/forums/showp...&postcount=486
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Old Aug 13, 2011, 06:07 PM
oTc
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removed..
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Last edited by oTc; Aug 13, 2011 at 06:32 PM. Reason: ...
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Old Aug 13, 2011, 06:59 PM
It's a spiderweb of knit lines
Souderton Pa. USA
Joined Mar 2002
2,639 Posts
Quote:
Originally Posted by NitroCharged View Post
Odysis Dopplered me this morning at 82.7mph using the iphone rcspeedo app.

It took quite a few runs to get it as the fan is pretty quiet.

I'll do another run tomorrow morning on video for POF and Official Doppler readings.
Very impressive, Dave!
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Old Aug 13, 2011, 10:05 PM
Team30 Micro EDF
NitroCharged's Avatar
Adelaide, Australia
Joined Apr 2004
11,199 Posts
Quote:
Originally Posted by 52Sabre View Post
Zebb - same deal here. Hoping if we talk nicely to our Oz friends they'll slip a couple in an envelope. letter postage?
Just waiting on a few other things to come into stock on the site before ordering up.


Thanks Mike.
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Old Aug 14, 2011, 06:27 AM
Check your six
martys's Avatar
New Jersey
Joined Sep 2002
1,240 Posts
Mig 15

Just got one for my Birthday! Can't wait to fly her. Marty
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Old Aug 14, 2011, 03:08 PM
Registered User
Joined Jun 2011
4 Posts
I will try to modify a GWS 40mm. I should be able to just machine it a little with a lathe at work.

How do i attach it to the motor? I cant see any threads on the impeller. Do i have to mill a hexagonal shape in the impeller and install a nut, or is there any other way to do it?
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