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budyerly(at)msn.com
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 Posted: Mon Jan 06, 2014 8:23 am Post subject: One wing Low |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> [img]cid:031401cef5fe$673751a0$604079AF(at)goldfishbk2xxe[/img][img]cid:031501cef5fe$673751a0$604079AF(at)goldfishbk2xxe[/img] Photo E-mail View slideshow | Download images About easy trims.
If it can go wrong, it will, and the more complex and wonderful, the more chance for extensive troubleshooting problems.
I prefer a built in aileron tab into the aileron with the servo attached and aileron balanced. Looks and operates well. a 10x1.5 inch tab will trim off any load and only deflect a very small amount keeping drag to a minimum. However in an aircraft with completed and painted surfaces I have used a spring system.
I usually try to find easy ways to make dumb simple, bullet proof control systems that can't be goofed up.
Here is an item I designed, built and installed on a customers aircraft. It uses a simple spring set on either side of the stick with a mac servo to pull left and right on one side and the other side has a simple bolt up system. The servo can be replaced by a screw or lever system with a locking ratcheted lever. The bracket on the stick is .060 minimum 6061 T 6 bent on the grain. I normally install autopilots in our aircraft and the roll servo goes under the seat or in the tunnel and attaches to the bracket also. The trick is getting the spring and servo arm both attached. Break out the OR spacers on hand and nuts, bolts, washers and patience.
The spring rate is the tough part. Don't get it too tight or it stiffens the stick too much. At the base of the stick cradle, you only need about 1 pound per inch max to trim a well rigged aircraft. I prefer springs that are 3 inches long. Use any length you want but make sure the extensions and hardware combination you use to attach to the servo or lever cannot bind. Without a trim servo motor or autopilot servo it is very simple to do. Autopilot servos have no trouble with the system.
The next item that this requires is a simple fiberglass box cover so you can't step on it... 3 layers of bid with a Reduxed angle on the floor and seat front keeps the cover set in place, but I glass or bolt in the attachment brackets to assure that if stepped on it doesn't move. Obviously the cover has to have a U in the center to clear the stick.
I don't have photo's as they are the property of my customers, but it is pretty simple. I prefer not to have an autopilot so that simplifies the trim. Works too.
Regards,
Bud Yerly
[img]cid:031601cef5fe$673751a0$604079AF(at)goldfishbk2xxe[/img] [img]cid:031701cef5fe$673c0c90$604079AF(at)goldfishbk2xxe[/img]
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| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Europa-List |
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peterz(at)zutrasoft.com
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| Posted: Mon Jan 06, 2014 8:59 am Post subject: One wing Low |
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I elected to go with a homemade single composite horseshoe spring on the end of a mac servo (jack-screw model) - very easy to adjust the spring rate to one's liking..... just add/remove plies accordingly, and less chance of breakage fowling the controls imho  ..... & nope not on my Europa 
[img]cid:7D2F80FF-A84F-4189-AAA0-8BA1832E08B4[/img]
On Tue, Dec 10, 2013 at 6:20 PM, Bud Yerly <budyerly(at)msn.com (budyerly(at)msn.com)> wrote:
[quote] [img]cid:031401cef5fe$673751a0$604079AF(at)goldfishbk2xxe[/img][img]cid:031501cef5fe$673751a0$604079AF(at)goldfishbk2xxe[/img] Photo E-mail View slideshow | Download images About easy trims.
If it can go wrong, it will, and the more complex and wonderful, the more chance for extensive troubleshooting problems.
I prefer a built in aileron tab into the aileron with the servo attached and aileron balanced. Looks and operates well. a 10x1.5 inch tab will trim off any load and only deflect a very small amount keeping drag to a minimum. However in an aircraft with completed and painted surfaces I have used a spring system.
I usually try to find easy ways to make dumb simple, bullet proof control systems that can't be goofed up.
Here is an item I designed, built and installed on a customers aircraft. It uses a simple spring set on either side of the stick with a mac servo to pull left and right on one side and the other side has a simple bolt up system. The servo can be replaced by a screw or lever system with a locking ratcheted lever. The bracket on the stick is .060 minimum 6061 T 6 bent on the grain. I normally install autopilots in our aircraft and the roll servo goes under the seat or in the tunnel and attaches to the bracket also. The trick is getting the spring and servo arm both attached. Break out the OR spacers on hand and nuts, bolts, washers and patience.
The spring rate is the tough part. Don't get it too tight or it stiffens the stick too much. At the base of the stick cradle, you only need about 1 pound per inch max to trim a well rigged aircraft. I prefer springs that are 3 inches long. Use any length you want but make sure the extensions and hardware combination you use to attach to the servo or lever cannot bind. Without a trim servo motor or autopilot servo it is very simple to do. Autopilot servos have no trouble with the system.
The next item that this requires is a simple fiberglass box cover so you can't step on it... 3 layers of bid with a Reduxed angle on the floor and seat front keeps the cover set in place, but I glass or bolt in the attachment brackets to assure that if stepped on it doesn't move. Obviously the cover has to have a U in the center to clear the stick.
I don't have photo's as they are the property of my customers, but it is pretty simple. I prefer not to have an autopilot so that simplifies the trim. Works too.
Regards,
Bud Yerly
[img]cid:031601cef5fe$673751a0$604079AF(at)goldfishbk2xxe[/img] [img]cid:031701cef5fe$673c0c90$604079AF(at)goldfishbk2xxe[/img]
[quote] ---
| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Europa-List |
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