Servo horn length F5B wings - Page 2

Troy · Nov 04, 2009, 04:42 PM

Quote:

Originally Posted by Darron

Joe,
When I used the outer hole on a D60 - I found I had a floating neutral. Both ailerons. It was a problem with the servo which always would overshoot and stop, in the overshot position. Using the inner hole would make this problem less obvious. Used that servo type many times and that was the first time I saw that problem, was also the first time I used the outer hole too. Swapped for the Hyperion servos.
D

My Hyperion DS09's have a weird double center like this too. It almost feels like the gears are lashed too tight and it can't mechanically return to center. No buzzing or weird binding noises.

Joe, what are you using on the control surface horn to keep your "L" bend from slipping off? No Z-bend there...

jjmouris · Nov 04, 2009, 05:39 PM

A bit of shrink tube with CA and also the linkage cover on the ailerons. The flaps can't come out anyway due to the narrow slot.

Joe

Troy · Nov 04, 2009, 07:16 PM

I figured as much but didn't see your covers.

George Shering · Nov 04, 2009, 07:22 PM

1.2mm and it is stiff enough.
I work hard on the hinge line. Use a triangular file on the top surface and gentle scraping on the bottom to get the aileron going up enough.
I think the idea of the cover is to have it just cover the horn, doesn't matter if it is same height at servo? Rudi just leaves it naked normally but I did see somewhere that he was using fairings (covers).

jjmouris · Nov 05, 2009, 05:03 AM

George, i don't know what is enough spoilers up at present. So going to try it and if needed i can work on the hinge. Don't see the point of doing anything on the bottom of the hinge in this case. It is clear the top skin is getting in the way.

Will use the covers this time on the ailerons. Will need to get rid of the last little bit of drag if i am to stand a chance beating the Germans.

George Shering · Nov 05, 2009, 12:36 PM

There is no such thing as "enough" up. I put them on a two position switch, first is maybe "enough" and the second is all I can get, commensurate with 100% servo travel. If you are going to beat the Germans then you cannot afford to overshoot the landing circle!

jjmouris · Nov 05, 2009, 05:15 PM

Ha but George, those 30 points landing bonus are only 3 more legs.

jjmouris · Nov 11, 2009, 04:47 AM

Here is the semi end result.

davidleitch · Nov 11, 2009, 05:50 AM

Hey Joe

That's a great job on the flap linkage. Did you reverse the servo horn? That is have it pointing down?

Personally I still believe it could be done with RDS, but not by me.

jjmouris · Nov 11, 2009, 07:04 AM

David, correct.

I removed the flap servo horn then put it back on 180 degrees out.

To not have the horn poke through the top surface of the wing it has to be made pritty damn short. So short that even when i drilled the new hole right next to the servo output shaft, it still made a bulge in the top wing skin and subsequent not happy servo friction. So i removed a little bit of the top skin and put a small sticker over it. Now everything runs clear, smooth and slop free. Nothing poking out above the skin.

In order to then get enough movement of the flap the flap horn has to be pritty small also. I am now at 125% travel both ways on the servo to get full brakes down and some up aileron function. You can see how big the horn is, it's pritty tiny.

Hense it's no surprise the Germans have made the whole thing internal in their own home built planes. Not to mention the reduction in drag.

I am pritty happy with the end result. Only time will tell if it survives day to day opperation.

Joe

Nov 11, 2009, 04:47 AM	#23
jjmouris High Performance Join Date: Aug 2008 Location: Southampton, UK Posts: 2,522	Here is the semi end result. Attached Thumbnails 73.8 KB · Views: 26 37.4 KB · Views: 46 Last edited by jjmouris; Nov 11, 2009 at 04:59 AM.

Nov 11, 2009, 07:04 AM	#25
jjmouris High Performance Join Date: Aug 2008 Location: Southampton, UK Posts: 2,522	David, correct. I removed the flap servo horn then put it back on 180 degrees out. To not have the horn poke through the top surface of the wing it has to be made pritty damn short. So short that even when i drilled the new hole right next to the servo output shaft, it still made a bulge in the top wing skin and subsequent not happy servo friction. So i removed a little bit of the top skin and put a small sticker over it. Now everything runs clear, smooth and slop free. Nothing poking out above the skin. In order to then get enough movement of the flap the flap horn has to be pritty small also. I am now at 125% travel both ways on the servo to get full brakes down and some up aileron function. You can see how big the horn is, it's pritty tiny. Hense it's no surprise the Germans have made the whole thing internal in their own home built planes. Not to mention the reduction in drag. I am pritty happy with the end result. Only time will tell if it survives day to day opperation. Joe Last edited by jjmouris; Nov 11, 2009 at 07:09 AM.

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Nov 04, 2009, 05:39 PM	#17
jjmouris High Performance Join Date: Aug 2008 Location: Southampton, UK Posts: 2,522	A bit of shrink tube with CA and also the linkage cover on the ailerons. The flaps can't come out anyway due to the narrow slot. Joe

Nov 04, 2009, 07:16 PM	#18
Troy My other car flies, no really. Join Date: Feb 1999 Location: Oceanslide, CA Posts: 4,510	I figured as much but didn't see your covers.

Nov 04, 2009, 07:22 PM	#19
George Shering Registered User Join Date: May 2005 Location: Scotland Posts: 833	1.2mm and it is stiff enough. I work hard on the hinge line. Use a triangular file on the top surface and gentle scraping on the bottom to get the aileron going up enough. I think the idea of the cover is to have it just cover the horn, doesn't matter if it is same height at servo? Rudi just leaves it naked normally but I did see somewhere that he was using fairings (covers).

Nov 05, 2009, 05:03 AM	#20
jjmouris High Performance Join Date: Aug 2008 Location: Southampton, UK Posts: 2,522	George, i don't know what is enough spoilers up at present. So going to try it and if needed i can work on the hinge. Don't see the point of doing anything on the bottom of the hinge in this case. It is clear the top skin is getting in the way. Will use the covers this time on the ailerons. Will need to get rid of the last little bit of drag if i am to stand a chance beating the Germans.

Nov 05, 2009, 12:36 PM	#21
George Shering Registered User Join Date: May 2005 Location: Scotland Posts: 833	There is no such thing as "enough" up. I put them on a two position switch, first is maybe "enough" and the second is all I can get, commensurate with 100% servo travel. If you are going to beat the Germans then you cannot afford to overshoot the landing circle!

Nov 05, 2009, 05:15 PM	#22
jjmouris High Performance Join Date: Aug 2008 Location: Southampton, UK Posts: 2,522	Ha but George, those 30 points landing bonus are only 3 more legs.

Nov 11, 2009, 05:50 AM	#24
davidleitch Tragic case Join Date: Feb 2002 Location: Sydney Australia Posts: 5,194	Hey Joe That's a great job on the flap linkage. Did you reverse the servo horn? That is have it pointing down? Personally I still believe it could be done with RDS, but not by me.