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1. 04:22 PM - fin (Chenoweth)
2. 07:01 PM - Re: fin (Harold Kovac)
Message 1
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Let me start with the questions first and then the story.
The question: Is the rear spar of the fin straight enough when a
straight edge laid along the hinge brackets is aft of the center one by
about 1/32 inch?
How about if it's out of line by more than 5/64 but less than 3/32?
These are apparently my two choices.
The story:
If I mount the fin per the drawing, front spar ahead of hold-down
bracket and fin pushed forward so that the hold-down bracket just
contacts the flanges on the fin's bottom ribs, the rear fin spar is
firmly against the 712 bulkhead but the out of true is the over 5/64
amount I mentioned above. Which, by the way, is the amount it turned
out to be out of true when I built it. At that point the rudder seemed
to work ok with it.
If, however, I mount the fin with the forward spar behind the hold-down
bracket and with the bracket just touching the flange of the fin's
bottom rib, the rear fin spar does not seat against the 712 - it's about
1/32 aft of it at its top. But I get the less than 1/32 out-of-true
measurement in the hinge line. Based on the way I'm making the up
elevator stop having the rear fin spar not contact the 712 is not a
problem because I can position the stop slightly aft to make good
contact with the spar and still have it function properly with the
elevator horns.
Any answers/comments you'd care to make would be very much appreciated.
Bill
RV9
Albion, Maine
Message 2
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Hi Bill,
I checked mine with a drilled acorn/cap nut, string thru the drilled
hole with a weight.
Mine came out with about a 1/64th" off center error.....seems easier
than a straight edge & worked with flaps too.
Harold, RV9A Fuselage wiring
----- Original Message -----
From: Chenoweth
To: rv9-list@matronics.com
Sent: Sunday, April 29, 2007 7:21 PM
Subject: RV9-List: fin
Let me start with the questions first and then the story.
The question: Is the rear spar of the fin straight enough when a
straight edge laid along the hinge brackets is aft of the center one by
about 1/32 inch?
How about if it's out of line by more than 5/64 but less than 3/32?
These are apparently my two choices.
The story:
If I mount the fin per the drawing, front spar ahead of hold-down
bracket and fin pushed forward so that the hold-down bracket just
contacts the flanges on the fin's bottom ribs, the rear fin spar is
firmly against the 712 bulkhead but the out of true is the over 5/64
amount I mentioned above. Which, by the way, is the amount it turned
out to be out of true when I built it. At that point the rudder seemed
to work ok with it.
If, however, I mount the fin with the forward spar behind the
hold-down bracket and with the bracket just touching the flange of the
fin's bottom rib, the rear fin spar does not seat against the 712 - it's
about 1/32 aft of it at its top. But I get the less than 1/32
out-of-true measurement in the hinge line. Based on the way I'm making
the up elevator stop having the rear fin spar not contact the 712 is not
a problem because I can position the stop slightly aft to make good
contact with the spar and still have it function properly with the
elevator horns.
Any answers/comments you'd care to make would be very much
appreciated.
Bill
RV9
Albion, Maine
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