Blackie

The short time I've been in the hobby I've often wondered why so many different control horns that are packaged with the servos that you purchase.

Take for instance the HS 645 MG servo. I just recently purchased one of these and have so in the past but this recent one came with extras I had not gotten in the past. It had in the box one large heavy duty round control horn that I often never gave much thought as I've always used the elongated or the half size arms.

The application I am using the 645 for will be on a pull-pull rudder and I'm curious since the circle horn is of the heavy-duty size should I use it on the pull-pull application.

Thanks
Blackie

MinnFlyer

My Feedback: (4)

You sure can, but a two arm will work just as good. Outside of the standard 4 and 6 arm horns, about the only thing I have found useful are the big wheel with no holes. I like them for retract. where you often have no travel adjustment at the Tx. You can drill holes wherever you need them to get the right amount of throw.

Blackie

Thanks Min I believe I'll give it a try.

Cactus.

My Feedback: (1)

i think the large round are good for screwing other things too, winches on boats, but what you can do is set the holes exactly, so you can get the right amount of aileron differential

the other horns are numbered, each arm is at a slightly different angle to the splines, so instead of putting trim in or sub trim, you can simply turn the horn until you find one at exactly 90 degrees to your output. a rarely known fact that one.. personally i think the boxes should have this info on, as well as those damn grommets, I've seen every way of using all the different types and I'm still confused.

Blackie

This is the setup I will be using. I'm thinking this will be ok.

Edit in

After more study I see the change is no different then the bottom discription that Mike gave, just ignore this.

DGrant

My Feedback: (4)

For some reason....I usually end up getting the Dubro Heavy-duty horn sets. I have drawers full of the original factory equipment, but the Dubro sets seem to have an overall easier to use, cleaner appeal to them. After about 10 planes using those...I've acquired a small supply of those..to be used......someday hehe.

BasinBum

My Feedback: (2)

Blackie,
If you look closely at that large round servo arm that came with your 645 you'll see that it is slightly offset. You said you are doing a pull/pull rudder and that may work very well for that application. If your control horns are not pefectly lined up with your hinge line you can balance out the geometry with the offset of the arm. I cut out the outline on the circle with some diagonal cutters and then smoothed it out on a disk grinder for a nice heavy duty arm, it works well.

Blackie

Thanks BB, yes I do see the outline drawn out on the horn, I'll give that a try.

Blackie

pettit

My Feedback: (23)

Those large round servo arms?

Drill out the center to 1/4", flatten one side with a sanding block and use them for wing bolt washers!

Blackie

Wing bolt washer?

Birdman3

Other uses for all those included control horns:

On a piece of fishing line, makes a great cat toy.

With a treble hook, makes a good sunfish lure.

Just the right size for a shim to level your TV or Monitor.

Super glue them to the dash of your car, and people think they are cool controls.

Use them to scratch off lottery tickets.

String them on hemp for kewl jewelry.

They make great Christmas gifts. People just say "Oh, thank you!" 'cause they don't want to say "What the heck is this?"