...hinging a rudder and on first glance it looks like there are problems. BUT I say that the hinge needs to be embedded into the rudder such that the hinge point is in line with the red cross and then 'slots' cut in the LE of the rudder to rotate around the hinge. My mate (yes Dave you!) says that's not right?

Embarrass me or agree with me!!

Agree, the center of the hinge point should be aligned with the center of the axis of pivot. Thats how I do all my hinges. If not, which you could do, your shrouds will rub on the control surface. But thats just my opinion, I could be wrong.

I agree with You.
semper fi
joe

Mark 10 points.
Dave 0 points.

J

It's simple Mark.

Measure the width of the leading edge, at the point where a hinge is located, divide that measurement by 2. this number will be the depth of the hinge on the pin. Then Depending on how much throw you want, you more than likely will have to carve out a slot for the hinge. The trick is not removing too much so they look good.

The picture shown is the wrong way to do it.

Billy

Thanks guys!

I knew it but some people just won't be told eh Dave!! I await your post mate

How much money did you win?

Billy,

Where is that wrong in the pic? If the hinge is 'in' the rudder then there has to be a 'slot' in the LE of the rudder otherwise the hinge cannot bend??!?!

Cheers,
Mark

Since your rudder leading edge is curved (convex) I assume the fin where it attaches is curved in (concave). If so, both you and ianober are correct. If, on the other hand your fin trailing edge is flat, then you would not need to embed the hinge point.

Craig

That would not work for a flat trailing edge with gap shrouds though Craig. You still need the pivot point of the hinge pin to be embedded in the rudder to avoid contact with the gap shrouds.

Guys,

The fin..........

Thats the same style trailing edge I have on my 18 and 15 and I sunk the hinges into the rudder. Worked out good.

I believe he meant w/ the hinge axis at the LE of the rudder (like it shows in the pic) w/o it "sunk" into the rudder....


But i agree with what everyone else has said

Sorry Mark, I thought the pic showed the final glued in pin. I didn't see your red marks showing the part that would be slotted. My BAD!!

If it had "gap shrouds" it would not be "flat". I was referring back to the days when we either sanded a horizontal "V" shape or rounded the leading edges of our control surfaces and hinged them to flat trailing edges (fin, wing, whatever). No shrouds, no cavities no embedding hinges.

In this case, I think we're saying the same thing though because in essence, gap shrouds would make it a concave cavity.

In any event, looking at the picture of his fin he will definately need to embed his hinges (as you said in the very first reply).

Gotcha Craig, I'm pickin up what your throwing down.