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01-05-2007, 01:58 PM
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Join Date: Oct 2005
Location: OWASSO,OK
Posts: 192
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FLAP CIRCUIT BREAKER
What size circuit breaker do I need for -8 flap motor?
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Jim Gallaway VAF#782 2013 PAID 2014 paid
Gundys airport
Owasso,Ok
RV8A N184JG FLYING SOLD
RV7 N1717G FLYING sold
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01-05-2007, 02:49 PM
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Join Date: May 2005
Location: Canby, Oregon
Posts: 1,786
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I used 5A
fuse for my RV9A. I think that the moters are the same.
Kent
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Kent Byerley
RV9A N94KJ - IO320, CS, tipup
AFS 3500, TT AP, FLYING....
Canby, Or
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01-05-2007, 02:58 PM
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Join Date: Jan 2005
Location: Atlanta, GA
Posts: 2,295
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Lots of folks have had the 5A breakers pop on them in flight and have replaced them with 7A breakers.
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"What kind of man would live where there is no daring? I don't believe in taking foolish chances but nothing can be accomplished without taking any chance at all." - Charles A. Lindbergh
Jamie | RV-7A First Flight: 7/27/2007 (Sold)
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01-05-2007, 05:08 PM
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Moderator/Tech Counselor
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Join Date: Jan 2005
Location: East Troy, WI
Posts: 1,983
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I have a 5 amp in mine. OK for 3 years. I don't have anything else hung on to it like indicators.
Roberta
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Roberta Hegy
Built/Flew an RV-7A
Air Troy Estates, East Troy, WI
Ford Expedition and TRICE "Q"
Built Glen L "ZIP" Classic Outboard Runabout and Super Spartan Hydroplane
Glen L Torpedo
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01-05-2007, 05:26 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,027
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Quote:
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Originally Posted by Jamie
Lots of folks have had the 5A breakers pop on them in flight and have replaced them with 7A breakers.
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How many is lots?
A few years ago I measured the current draw of the flap motor just as it was being stalled and if I remember correctly it was about 3.5 amps (This was the old style motor but I believe the new shold be about the same).
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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01-05-2007, 05:33 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
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Originally Posted by N184JG
What size circuit breaker do I need for -8 flap motor?
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You probably know this but I'll mention it any way.
Use a pullable type breaker for the flap motor. Just in case you get a runaway, you will be able to turn it off. Probably not before it runs the flaps all the way down but at least you won't have to worry about smoking your motor.
Just my $.02
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Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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01-05-2007, 07:55 PM
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Join Date: Jan 2005
Posts: 4,283
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It depends
AMPS vary under load and just sitting on ramp. If you like lowering flaps full at 100 mph than you will pull more juice. (I suggest slowing down before going full flaps.) 5 to 7 amps sounds right. I measure the same, about 3-3.5 amps under no load.
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George
Raleigh, NC Area
RV-4, RV-7, ATP, CFII, MEI, 737/757/767
2020 Dues Paid 
Last edited by gmcjetpilot : 01-05-2007 at 07:57 PM.
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01-05-2007, 09:27 PM
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Join Date: Aug 2005
Location: AZ
Posts: 43
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CB Sizing
Just a reminder. Circuit Breaker sizes should not be sized for the current draw of the device on the end of the line, but rather to protect the WIRES. Size the wires for the device...
John
#40208 Wings
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