Servo position? (Full Version)

All Forums >> [RC Airplanes] >> Giant Scale Aircraft - 3D & Aerobatic >> Carden Aircraft



Message

80stars -> Servo position? (2/6/2008 11:50:39 PM)

OK boys,

Where do I place my aileron and elevator servos with reference to the hinge line? I would believe the closer to the hinge line ie: shortest linkage length, would be ideal, but isn't their a "standard" linkage length that you are working for? I can cut foam anywhere, so I might as well try and do somthing different and get it right the first time [8D].

Hardware is a personal preference, give me your "this works best" method please. For what it is worth, my decisions are for a 30% 300 that I will be adding the TOC mods to (increased elevator, rudder and ailerons). Planning on a standard 1 in arm length and 3D throws.

Doug

I am trying to shed my 1.20 thinking, please be patient.



zzw26n -> RE: Servo position? (2/7/2008 2:39:55 AM)

Doug,

Could you get 3" Hangar 9 titanium pushrods, 4-40 ball links, and Nelson control horns? Put those pieces together on a Servo and measure it. The control horns will be over your hinge line and the total set up will show you were to place the servo. It's one way.



Neilbo4 -> RE: Servo position? (2/7/2008 3:14:13 AM)

On the plans you should be able to measure how far from the hinge line the servo box is which will then determine the length of the linkage you will need. I know on my 35% Dalton 260 the servos are like 3/4 inch. away from the hinge line. Don't quote me on that but I am pretty sure it is close to that. But as I said the plans should tell you how far, at least my Dalton plans did....

Neil



RBACONS -> RE: Servo position? (2/7/2008 4:33:16 PM)

And of course, for the stabs, you also need to ensure that the servo placement will not interfere with the anti-rotation pins or stab tube socket and perhaps most importantly that the airfoil at the selected location is deep enough to allow the servo to be fully seated.



80stars -> RE: Servo position? (2/7/2008 8:53:24 PM)

Thanks guys,

All good advice. My plans do not give the detail on servo placement (left up to the builder) and as for the stabs, the design calls for a non-removable surface so tube and pins won't be an issue. Ward, you read my mind, I stopped by the local shop today and picked up some 3" hangar 9 titanium rods, 4-40 links and hangar 9 8/32" control horns. I figure I will start there, and now knowing I can get the rods in 1/2" links from 2-5" I should be able to figure this out pretty fast.

Thank you all,

Doug



BBW Walt -> RE: Servo position? (2/9/2008 12:33:03 AM)

I place the center of the servo opening 3-3/4 inches from the hinge line. Walt



zzw26n -> RE: Servo position? (2/9/2008 12:35:36 AM)


quote:

ORIGINAL: BBW Walt

I place the center of the servo opening 3-3/4 inches from the hinge line. Walt



Walt,

What size push rod do you end up with usually with the 3-3/4 off-set?

Ward



80stars -> RE: Servo position? (2/9/2008 5:05:34 AM)


quote:

ORIGINAL: BBW Walt

I place the center of the servo opening 3-3/4 inches from the hinge line. Walt

Thanks Walt,

I ended up at 4" to the output shaft from the hinge line, which by my figures = linkages plus a 2.5 rod.

Doug



Page: [1]

Valid CSS!




SITE MAP!   : :   FORUM RULES

© 2001 - 2007 24-7 RC, LLC, all rights reserved.
0.15625