linear actuator for flaps

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jeffreyhowell
Posts: 11
Joined: Mon Aug 15, 2016 2:56 pm

linear actuator for flaps

Postby jeffreyhowell » Tue Aug 16, 2016 8:38 pm

Does anybody know the model number and the specification for the linear actuator used on the flaps? I am removing the flex disks out of the system and I am replacing them with universal joints. I need to calculate max force in single shear (as if one flap was jammed) with load path through one flap only. I ultimately want to stall the motor and not break any parts in the event of a jam... Thanx for the input...Jeff

jeffreyhowell
Posts: 11
Joined: Mon Aug 15, 2016 2:56 pm

Re: linear actuator for flaps

Postby jeffreyhowell » Wed Aug 31, 2016 4:35 pm

After more research and talking to Darrell the actuator used is a linak us inc product with 750n of force. This equates to 169lbs of force. I believe that if you take the force of the actuator and times it by the arm (in this case 4" from center or flap torque tube) you will get the torque. I came up with 676 in/lbs of torque for the flap torque tube at the actuators max force. If you divide this by 2 (both flaps) you will get the max torque of each of the two tubes.

LarryK
Posts: 19
Joined: Wed Dec 31, 2014 11:09 pm

Re: linear actuator for flaps

Postby LarryK » Fri Dec 30, 2016 8:39 pm

Does that equate to a useable part number? :D how many amps are you anticipating?

jchisolm
Posts: 24
Joined: Tue Jun 17, 2014 9:56 pm

Re: linear actuator for flaps

Postby jchisolm » Wed Jan 04, 2017 3:04 pm

Probably the LA-14. This is listed at 750N
http://www.linak-us.com/products/linear ... oduct=LA14
Joe Chisolm
Express CT builder
Marble Falls, Texas

jeffreyhowell
Posts: 11
Joined: Mon Aug 15, 2016 2:56 pm

Re: linear actuator for flaps

Postby jeffreyhowell » Tue Jan 10, 2017 2:42 pm

Thanx That helps a bunch!!!

jchisolm
Posts: 24
Joined: Tue Jun 17, 2014 9:56 pm

Re: linear actuator for flaps

Postby jchisolm » Wed Jan 11, 2017 1:48 pm

Couple of other things I found
A servo video. Kind of interesting

https://www.youtube.com/watch?v=L5tx64G1ilQ

Mostly robotics but a good selection of linear actuators and servos

https://www.servocity.com
Joe Chisolm
Express CT builder
Marble Falls, Texas

jchisolm
Posts: 24
Joined: Tue Jun 17, 2014 9:56 pm

Re: linear actuator for flaps

Postby jchisolm » Tue Feb 14, 2017 12:58 pm

Would someone please share how fast your flaps deploy and retract. I'm looking at some of the speeds on these actuators. The spec sheets for the LA14 at 12V, fast pitch, 700N force will move about 15mm per second. 4 inches would be 101.6mm so lets just call it 100. 100/15 is 6.7 seconds. Is this anywhere close to actual flap travel time?

The reason I'm asking is I'm looking at different alternatives to the LA14 and I'm trying to compare volt/amp/speed curves.

Thanks
Joe Chisolm
Express CT builder
Marble Falls, Texas

kevin
Site Admin
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Location: KCRG
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Re: linear actuator for flaps

Postby kevin » Tue Mar 21, 2017 6:05 pm

About 6-7 seconds full flap travel would be close- too fast and it could lead to control issues.
My linear actuator is 1/2" per second with around 4" total travel.

kevin
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Location: KCRG
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Re: linear actuator for flaps

Postby kevin » Tue Mar 21, 2017 6:12 pm

http://www.ebay.com/itm/Derock-Heavy-Du ... SwUKxYhtx-

will work just fin. Builtin limit switches, works with a normal DPDT switch.

n49ex
Posts: 7
Joined: Tue Mar 14, 2017 2:49 pm

Re: linear actuator for flaps

Postby n49ex » Wed Mar 22, 2017 7:15 pm

Here's my flap system, mechanical, electrical, etc. Mine is in the center - the space it takes is no big deal, and a lot easier to get to than in the wing.

http://www.a-and-t-labs.com/n49ex/Flap_system.ppt

The SKF actuator is not available anymore, but they have similar ones. I chose this one because it is industrial grade, about 250 pounds, very light. The pictures show the position sensor mechanism as well.

Reinhard Metz


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