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Flap motor - failure, prevention and request

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vshimsl(at)live.com
Guest

Posted: Wed Oct 14, 2009 2:15 am Post subject: Flap motor - failure, prevention and request

Hello C

  

 Twenty hours on my RV-8 and the flap motor went south. Inspection reveals the wire insulation right where the wires enter the motor housing opened up (both wires) and shorted then broke. I suspect a lot of the intermittent operatio problems posted on the list are due to the wires internally breaking. The cleaning and reinstallation may temporarily cause the wires to reconnect thus masking the real problem.

  

 Prevention recommendation:

 Use some sealant to provide some strain relief where the wires enter the housing. Also loop the wire and attach it to the housing to move the flex point of the wire away from where the wires enter the motor C actually the black plastic brush housing.

  

 The wires themselves do not appear to be teflon. Actually they appear to be quite cheap.

  

 Van's want over $320.00 for this motor. My reaction is "I don't think so...".

  

 If you open up the motor you will see that both wires go into a plastic brush housing. I will attempt to rewire this and report back success or failure. 

  

 Just in case my effort fails C has anybody tried to order just the internal plastic brush housing (with wires) from the motor manufacturer? If so could you share the details? Contacts? Price?

  

  

 Thanks C

 Vince H.

 Idaho C Washington

 RV8 N8432 (20 hours)

  

 		 	   		  Your E-mail and More On-the-Go. Get Winrect/01/' target='_new'>Sign up now.  [quote][b]

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Jesse Laub

Joined: 24 Oct 2008
Posts: 5

Posted: Wed Oct 14, 2009 1:38 pm Post subject: Flap motor - failure, prevention and request

Hey Vince...and others,



I have a Flap Motor for an RV8, never used, was installed, tested and 

removed.  $200 plus shipping and insurance.

Also have a Flap Positioning System and Flap Control Circuit Board (to 

control flaps through stick grip)

You can call 541-563-4475 or e-mail jesse(at)casco.net



Jesse Laub

Parting out RV8A project

Waldport, OR



Vincent Himsl wrote:

 	  Quote: 	
		   Hello,

  

 Twenty hours on my RV-8 and the flap motor went south. Inspection 

 reveals the wire insulation right where the wires enter the motor 

 housing opened up (both wires) and shorted then broke. I suspect a lot 

 of the intermittent operatio problems posted on the list are due to 

 the wires internally breaking. The cleaning and reinstallation may 

 temporarily cause the wires to reconnect thus masking the real problem.

  

 Prevention recommendation:

 Use some sealant to provide some strain relief where the wires enter 

 the housing. Also loop the wire and attach it to the housing to move 

 the flex point of the wire away from where the wires enter the motor, 

 actually the black plastic brush housing.

  

 The wires themselves do not appear to be teflon. Actually they appear 

 to be quite cheap.

  

 Van's want over $320.00 for this motor. My reaction is "I don't think 

 so...".

  

 If you open up the motor you will see that both wires go into a 

 plastic brush housing. I will attempt to rewire this and report back 

 success or failure.

  

 Just in case my effort fails, has anybody tried to order just the 

 internal plastic brush housing (with wires) from the motor 

 manufacturer? If so could you share the details? Contacts? Price?

  

  

 Thanks,

 Vince H.

 Idaho, Washington

 RV8 N8432 (20 hours)

  



 ------------------------------------------------------------------------

 Your E-mail and More On-the-Go. Get Winrect/01/' target='_new'>Sign up 

 now.

 *

 *

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Speedy11(at)aol.com
Guest

Posted: Thu Oct 15, 2009 2:26 pm Post subject: Flap motor - failure, prevention and request

Vince,

 I've heard of a lot of RV-8 flap motor failures, but never has anyone (that  I'm aware of) investigated the reason for them - and certainly none  have discovered the wiring problems you spoke of.

 I am just reaching 20 hours on my RV-8A and I'm going to take your advice  and strengthen the wiring.  I took care to secure the flimsy wires when  building, but I'm going to address the issue again.

 Thanks for reporting your info.

 Stan Sutterfield

  

  	  Quote: 	
		  Twenty    hours on my RV-8 and the flap motor went south. Inspection reveals t

he    wire insulation right where the wires enter the motor housing opened up    

(both wires) and shorted then broke. I suspect a lot of the intermittent    op

eratio problems posted on the list are due to the wires internally    breaking

. The cleaning and reinstallation may temporarily cause the wires    to reconn

ect thus masking the real problem. 	


 

  

  [quote][b]

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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Matt Dralle
Site Admin

Joined: 08 Nov 2005
Posts: 25203
Location: Livermore CA USA

Posted: Thu Oct 15, 2009 2:59 pm Post subject: Flap motor - failure, prevention and request

At 03:15 PM 10/15/2009  Thursday, you wrote:

 	  Quote: 	
		  Vince,

I've heard of a lot of RV-8 flap motor failures, but never has anyone (that I'm aware of) investigated the reason for them - and certainly none have discovered the wiring problems you spoke of.

I am just reaching 20 hours on my RV-8A and I'm going to take your advice and strengthen the wiring.  I took care to secure the flimsy wires when building, but I'm going to address the issue again.

Thanks for reporting your info.

Stan Sutterfield

 

Twenty hours on my RV-8 and the flap motor went south. Inspection reveals t

he wire insulation right where the wires enter the motor housing opened up 

(both wires) and shorted then broke. I suspect a lot of the intermittent op

eratio problems posted on the list are due to the wires internally breaking

. The cleaning and reinstallation may temporarily cause the wires to reconn

ect thus masking the real problem.


	


Here are a couple of pictures of how I wired up my RV-8 flap motor.  Notice how the attached red/black wires are secured to the motor with a couple of wire ties and that there is a generous service loop going into the connector.  With this arrangement, there is never any movement of the wires going to the motor connector when the flap motor is moving.  Seems like it should be pretty long-term durable...



Matt Dralle

RV-8 #82880 N998RV

http://www.mattsrv8.com

Adding Rubber Gaskets To Baffling...

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_________________
Matt Dralle
Matronics Email List Administrator

rv8a2001(at)yahoo.com
Guest

Posted: Thu Oct 15, 2009 6:11 pm Post subject: Flap motor - failure, prevention and request

The usual reason for failures, at least years ago, was grease from the threaded shaft getting into the brushes. This issue is the first I have heard of.

 



Scott

 RV-8a



--- On Thu, 10/15/09, Speedy11(at)aol.com <Speedy11(at)aol.com> wrote:

 	  Quote: 	
		  

From: Speedy11(at)aol.com <Speedy11(at)aol.com>

Subject: Re: Flap motor - failure, prevention and request

To: rv8-list(at)matronics.com

Date: Thursday, October 15, 2009, 3:15 PM



      Vince,

 I've heard of a lot of RV-8 flap motor failures, but never has anyone (that  I'm aware of) investigated the reason for them - and certainly none  have discovered the wiring problems you spoke of.

 I am just reaching 20 hours on my RV-8A and I'm going to take your advice  and strengthen the wiring.  I took care to secure the flimsy wires when  building, but I'm going to address the issue again.

 Thanks for reporting your info.

 Stan Sutterfield

  

  	  Quote: 	
		  Twenty    hours on my RV-8 and the flap motor went south. Inspection reveals t

he    wire insulation right where the wires enter the motor housing opened up    

(both wires) and shorted then broke. I suspect a lot of the intermittent    op

eratio problems posted on the list are due to the wires internally    breaking

. The cleaning and reinstallation may temporarily cause the wires    to reconn

ect thus masking the real problem. 	


 

  

   	  Quote: 	
		  http://www.matronics.com/Ntarget="_blank" href="http://forums.matronics.com">http://forums.matron    - List

gt; 	


	


         [quote][b]

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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chriswelsh(at)sbcglobal.n
Guest

Posted: Fri Oct 16, 2009 12:23 pm Post subject: Flap motor - failure, prevention and request

When I was installing the flap actuator, I could not get the bolts on the nylon bushing tight without the actuator binding.  I ended up reaming the holes in the nylon blocks out to 5/16 and making some bushings.  I also capped the top of the blocks with a piece of .06 aluminum.  This allowed me to torque the bolts properly with no binding of the actuator.  I have no idea if this will help the longevity of the flap motor, but it can't hurt.  The motor was noticeably quieter with no binding as would be expected.  The other thing I did was add two zener diodes back to back at the motor connector hoping to alleviate voltage spikes and arcing of the motor brushes.  Again, no data yet as to whether or not this increases motor longevity but again it can't  hurt.



Chris Welsh



 

From: "Speedy11(at)aol.com" <Speedy11(at)aol.com>

To: rv8-list(at)matronics.com

Sent: Thursday, October 15, 2009 3:15:30 PM

Subject: Re: Flap motor - failure, prevention and request



       Vince,

 I've heard of a lot of RV-8 flap motor failures, but never has anyone (that  I'm aware of) investigated the reason for them - and certainly none  have discovered the wiring problems you spoke of.

 I am just reaching 20 hours on my RV-8A and I'm going to take your advice  and strengthen the wiring.  I took care to secure the flimsy wires when  building, but I'm going to address the issue again.

 Thanks for reporting your info.

 Stan Sutterfield

  

  	  Quote: 	
		  Twenty    hours on my RV-8 and the flap motor went south. Inspection reveals t

he    wire insulation right where the wires enter the motor housing opened up    

(both wires) and shorted then broke. I suspect a lot of the intermittent    op

eratio problems posted on the list are due to the wires internally    breaking

. The cleaning and reinstallation may temporarily cause the wires    to reconn

ect thus masking the real problem. 	


 

  

   	  Quote:

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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Speedy11(at)aol.com
Guest

Posted: Sat Oct 17, 2009 5:21 pm Post subject: Flap motor - failure, prevention and request

Chris,

 Great info.  I did something similar, but not to the extent you  did.  I'll relook those issues.

 Thanks,

 Stan Sutterfield

 Do not archive

  

  	  Quote: 	
		  When I    was installing the flap actuator, I could not get the bolts on the    nylon

bushing tight without the actuator binding.  I ended up reaming    the holes in

the nylon blocks out to 5/16 and making some bushings.  I    also capped the top

of the blocks with a piece of .06 aluminum.  This    allowed me to torque the bolts

properly with no binding of the    actuator.  I have no idea if this will help

the longevity of the flap    motor, but it can't hurt.  The motor was noticeably

quieter with no    binding as would be expected.  The other thing I did was add

two zener    diodes back to back at the motor connector hoping to alleviate    voltage

spikes and arcing of the motor brushes.  Again, no data yet as    to whether or

not this increases motor longevity but again it can't    hurt.



Chris Welsh

	


 

  

  [quote][b]

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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