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craigb(at)onthenet.com.au
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 Posted: Sat Dec 29, 2007 2:22 am Post subject: Trim System for Ailerons, Comments please |
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This is a knock off of the COZY canard trim, modified to suit. It attaches to the push rod arm on the existing bolts
so no mods or extra hardware are needed, other than the hole for the bell crank bolt in the seat back and the four holes
to mount the servo. Complete assembly weighs in at 330grams.
Horse shoe spring is 6 layers of 27000 psi UNI kevlar. 5 inches in diameter (a CD is a good template)
with a 30mm tail to allow for mounting
Arm mounting bracket is 3mm x 20mm alloy angle, with another 3mm x 40mm plate alloy 100mm long with a 20 degree bend towards
the floor of the aircraft. six rivets and 420 hold the two together. the other end of the spring is also 3mm x 20mm angle.
Spring is clamped in at both ends and 420'ed in place.
Bell crank is supported by 3 bearings, and has 3 positions for spring mount point to allow for 1:1, 1.5:1 and 2:1 gearing
of the servo. Alloy for bell crank is 11mm cold rolled solid billet, which was milled to size, (hand cutting was just tooo hard)
angle of crank is 25 degrees, but i think about 20 would be better. Mount hole is 45mm above the small step under the seat for
the rudder cables
servo is ray allen with 1 inch travel.
attachment from spring to crank is 3/16 rod with nylock nuts. servo to crank is with the supplied threaded rod and ends
Spring can support weight of controls with cockpit module on its side. If control weight is "dropped" onto spring at neutral
position controls rebound to "center" position.
The spring and crank can be inserted through the port side spar hole. Servo and crank adjustment can be done through fuel tank
access ports.
Any comments, thoughts, other issues I am not aware of.
regards
craig
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paul.the.aviator(at)gmail
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| Posted: Sat Dec 29, 2007 8:05 am Post subject: Trim System for Ailerons, Comments please |
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Hi Craig,
The only thing that occurs to me is that sometimes after a few years
the tank bulges and you have to move the aileron push rod to the other
side of the crank so the push rods will clear the bulging tank.
If you ever have to do this then I suspect that will interfere with
where you have mounted your trim servo.... perhaps not, and if you
tank never bulges then it won't be an issue.
Cheers, Paul (The misplaced Aussie)
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aireupora(at)sbcglobal.ne
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| Posted: Sat Dec 29, 2007 8:53 am Post subject: Trim System for Ailerons, Comments please |
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[quote]
Nice job Craig. It to cold here in California to do any lay-ups so I am building
POPS' KNOCKDOWN FUSELAGE CRADLE http://members.bellatlantic.net/~cpops/cradle.htm
The only problem is he didn't publish any measurements other than the lenght of the 2x4's. I built it yesterday, but it was not right. So last night I took a piece of paper and figured out the measurements. I figured out that the base needs to be 18 inches and that the side 2x4 needs to be at 18 inches also. That will give me the right angle. So I can move the canoe to any position I need during the build. Flat, 45 degrees or 90 degrees.
I'll look into doing the fuel tank spacer today or tomorrow. Then the servo. I need to figure out where I put it. I took it out of the aileron and put it back it it's box, but where I put the box is the question.
I like your arrangement, but I still think that attaching it to the push-pull rod might work. I'll try it and see. I'll use regular UNI and do a ten ply layup. I'll us a four inch circle. I foud on ole Planters can that I'll tape up with duck tape and wax it then do the layup on it. I'll cut a hole in a board so the can is flat. I'll let you know my outcome. where is OZ are you? About ten years ago I picked up a tuna boat north of Auckland. I had fifteen days there. I traveled all over the north island. I had a great time. I joined the flying club and flew from the ninety mile beach to the south shore. I tried to fly over the channel but the government would not allow me to go because of the single engine and WX. When I win the Lotto I'll come back.
[b]
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craigb(at)onthenet.com.au
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| Posted: Sat Dec 29, 2007 12:06 pm Post subject: Trim System for Ailerons, Comments please |
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Paul, I take it you are looking at the mount point for the spring, and not the servo, when you mention moving the push rods to the other side
of the arm. I don't think this will be a problem, as the stiff nuts are acting
as spacers now, to move the whole mount forward 5mm or so. So if the rods are switched to the other side then they would become the spacers
i guess, so not much would change.
Someone asked off topic, what about the push rod for the flaps. I take it
this is on the older mono's without the electric flap drive. Given its only
the threaded rod that crosses the tunnel, if the flap rods movement
is largely linear, then i am sure one of you smart guys with the monos could work out the servo reposition.
Visit - www.EuropaOwners.org
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