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Old 04-07-2021, 07:53 PM
gcrane01 gcrane01 is offline
Join Date: Mar 2010
Location: Northern CA
Posts: 13
Default No flaps

Rv8 A. Flaps work on the ground whether on battery or alternator power. In the air they wonít move. Checked for obstruction behind seat and all. Nothing obvious. Any ideas?
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Old 04-07-2021, 08:02 PM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,943

Are you using a Flap Positioning System - the one with the notched rod that trips micro switches?

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Old 04-07-2021, 08:32 PM
scrollF4's Avatar
scrollF4 scrollF4 is offline
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Join Date: Jan 2010
Location: Flower Mound, TX
Posts: 1,567
Default And/Or....

...are you using Vertical Power Pro VPX and an EFIS (like SkyView)? VPX can be programmed to limit/inhibit flap actuation based on pilot-set airspeeds. The airspeed may be set too low.

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52F NW Regional/Aero Valley Airport, Roanoke TX (home of DR's Van Cave)
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Old 04-08-2021, 01:44 AM
mike newall's Avatar
mike newall mike newall is offline
Join Date: Jan 2005
Location: Yorkshire, England
Posts: 2,140

Probably the old grease contamination. Strip the motor/gearbox and check for grease from the gearbox getting into the motor.
"I add a little excitement, a little spice to your lives, and all you do is complain!" - Q

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Old 04-08-2021, 08:52 AM
gcrane01 gcrane01 is offline
Join Date: Mar 2010
Location: Northern CA
Posts: 13

No flap positioning system or anything fancy. This RV was finished in 2004 before all the fancy stuff came out. This is a pure hit the switch, look out the window and check the position of the flaps.

I'm going to try to put resistance on the flaps while I hit the switch. Electrically nothing changes when I'm airborne
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Old 04-09-2021, 09:01 AM
FinnFlyer FinnFlyer is offline
Join Date: Aug 2018
Location: Bell, FL
Posts: 495
Default Don't fly

There is a service bulletin about safety-wiring the flap motor output shaft (screw).

Make sure it hasn't worked itself all the way out of the rod end.

(Sorry if I'm wording this wrongly.)

N214FL RV-4 Mazda 13B Renesis First flight 20 Feb 2021
N46AZ RV3-B Mazda 13B EFI -- Bought -- Flying
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Old 04-10-2021, 05:30 PM
gcrane01 gcrane01 is offline
Join Date: Mar 2010
Location: Northern CA
Posts: 13

Thanks. Iíll check that out.
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