SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Reply
Thread Tools
Old Jun 28, 2007, 02:01 AM
Suspended Account
Bilbobaker's Avatar
United States, UT, Salina
Joined Apr 2003
3,117 Posts
Question
Any testing been done on the BP A2204-19

Anyone have any info on this little motor from BP hobbies?
Looks cute.
Bilbobaker is offline Find More Posts by Bilbobaker
Reply With Quote
Sign up now
to remove ads between posts
Old Jul 02, 2007, 01:57 AM
Suspended Account
Bilbobaker's Avatar
United States, UT, Salina
Joined Apr 2003
3,117 Posts
I found some pretty good stuff about it here.
http://www.rcgroups.com/forums/showt...ght=A2204%2F19
Bilbobaker is offline Find More Posts by Bilbobaker
Reply With Quote
Old Jul 02, 2007, 02:09 AM
Suspended Account
Bilbobaker's Avatar
United States, UT, Salina
Joined Apr 2003
3,117 Posts
Bummer now there out of stock.
Bilbobaker is offline Find More Posts by Bilbobaker
Reply With Quote
Old Jul 22, 2007, 03:26 PM
Registered User
Joined Feb 2005
43 Posts
Bp A2204-19

Bill,

After some initial problems with the motor finally got a little test data.

The only Prop I had that was close to the BP suggested one is the APC 7040SF

@

7.4 volts, 3.8 Amps, 6870 RPM, 169.6 Grams thrust

@

10.2 volts, 5.28 Amps, 8160 RPM, 242.8 Grams thrust.

The prop saver screws are "kitty whapus" and interfere with the bell and prevent installing the rubber. The shoulder for the prop mount is 0.45 and doesn't fit any of the APC shaft adapters I have. You can make the 0.375 adapter fit if you install it backwards in the Prop. both motors I have are the same.

I overcame the screw interference by placing longer screws (see Pic's)
Both of the original screws interfere so mounting the rubber by removing one screw is not an option.

I plan on replacing the original screws with set screws and putting in a new shaft that is long enough to use a shaft mounted propsaver or adapter.

The extended shaft idea did not work out. The motor bearings are to close to together, separated by ~ 1/8 inch. This spacing will not allow stable rotation at high RPM with an extended shaft and prop adapter. Both of my motors would break into oscillation and loose thrust on 3S near full throttle.

Overall nice motor, hope BP gets things fixed.
al_wa is offline Find More Posts by al_wa
Last edited by al_wa; Aug 07, 2007 at 12:50 PM. Reason: Added finding of instability with extended shaft, (italic)
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Idea Any "must" modifications to be done on the Cub? pitch black GWS (Grand Wing Servo) 3 Dec 06, 2004 12:05 AM
post any pics here of what has been done with a cnc foam cutter sylair Foamies (Kits) 0 Jun 23, 2003 07:25 PM
Has there been any testing done on GWS versus APC slowfly props kitbasher Parkflyers 0 Dec 09, 2002 02:39 PM
Testing AMP draw on motor?? try2fly Power Systems 6 Feb 26, 2002 06:15 PM
Brushless on a Zagi. Has it been done? Mikael Pedersen Foamies (Kits) 7 Oct 06, 2001 09:44 AM