linear actuator for flaps

[jeffreyhowell]

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]

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]

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

[jchisolm]

Probably the LA-14. This is listed at 750N
http://www.linak-us.com/products/linear ... oduct=LA14

[jeffreyhowell]

Thanx That helps a bunch!!!

[jchisolm]

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

[jchisolm]

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

[kevin]

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]

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

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

[n49ex]

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