Retract servos
05-19-2008, 09:10 PM
#2
RE: Retract servos
You need to use a retract servo similar to this: [link]http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXPB42&P=ML[/link]
Retracts are different from normal servos in that they only have two positions. Normal servos are fully proportional meaning that they can move to any point within their travel range. Retract servos are designed to move from one position and turn 180° to the other position. While normal servos can do this, they will absolutely drain your battery. Retract servos move to a position and then draw no more current while they rest in that position. A normal servo will move to that position and then have to draw power to remain there. It's entirely possible that you can drain a flight pack in just one flight by using normal servo for a retract servo.
Hope this helps
Ken
Retracts are different from normal servos in that they only have two positions. Normal servos are fully proportional meaning that they can move to any point within their travel range. Retract servos are designed to move from one position and turn 180° to the other position. While normal servos can do this, they will absolutely drain your battery. Retract servos move to a position and then draw no more current while they rest in that position. A normal servo will move to that position and then have to draw power to remain there. It's entirely possible that you can drain a flight pack in just one flight by using normal servo for a retract servo.
Hope this helps
Ken
05-19-2008, 11:25 PM
#3
Senior Member
RE: Retract servos
What he said...
Also, retract servos are usually low profile (thinner). This allows them to fit better in the wing and allows space for the linkage.
Also, retract servos are usually low profile (thinner). This allows them to fit better in the wing and allows space for the linkage.
05-20-2008, 07:03 AM
#4
Senior Member
RE: Retract servos
If you happen to be assembling one of the H9 warbirds that have rotating gear (P40, F4U, or F6F), you might look at these.
No screwing around with a servo linkage or building in all the stuff that air retracts require. Put 'em in where the mechanicals go, plug 'em into the RX, and fly.
https://smartweb.ipower.com/lado/pro...0&productID=19
No screwing around with a servo linkage or building in all the stuff that air retracts require. Put 'em in where the mechanicals go, plug 'em into the RX, and fly.
https://smartweb.ipower.com/lado/pro...0&productID=19
05-21-2008, 07:23 PM
#6
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RE: Retract servos
Well, the servo is hooked up to the gear through some sort of linkage I assume. The servo is not directly hooked up to the gear.
Same thing with all your control surfaces. Your servo may be maxed out at 180*, but your control surfaces may have only moved a fraction of that. Your servos are not directly hooked up to your control surfaces similar to how it is not directly hooked up to the retract gear.
Same thing with all your control surfaces. Your servo may be maxed out at 180*, but your control surfaces may have only moved a fraction of that. Your servos are not directly hooked up to your control surfaces similar to how it is not directly hooked up to the retract gear.
05-22-2008, 07:32 AM
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RE: Retract servos
90 degrees from center each direction equals 180 degrees of travel. 90 degrees extend and 90 degrees retract equals 180 degrees. Trust us, you need 180 degrees. And, if you don't hook the linkage up just right, you'll have too much or not enough travel, and there is no electronic end point adjustment on these. So you might need some help if this is your first time to set up mechanical retracts.
