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ACRO E-mail Archive Thread: [Acro] Flying/Landing Wire Tension Matching

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ACRO E-mail Archive Thread: [Acro] Flying/Landing Wire Tension Matching



                


Thread: [Acro] Flying/Landing Wire Tension Matching

Message: [Acro] Flying/Landing Wire Tension Matching

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From: Neal Frangesh <LGAENG at compuserve.com>

Date: Tue, 26 Mar 2002 16:03:10 UTC


Message:

  
I have used the fish scale method to adjust the wires on an S-2A and an
S-1T.  It works quite well on the flying wires and the landing wires.  It
doesn't work very well on the tail brace wires.  

You can check how closely you have matched the tension in any pair of wires
(e.g., both flying wires on right side) by listening to the tone they make
when "plucked".    Wires in tension have several modes of vibration (please
don't ask, its been along time...).  Make sure you pluck the wire close to
the center so you get the wire vibrating in its simplest mode at its
fundamental frequency.  If both wires make the same tone when plucked, both
wires have the same tension.

If both wires have exactly the same tension, the second wire (the one not
plucked) will visably vibrate in sympathy with the one you plucked.  If
both wires have approximately the same tension, the second wire (the one
not plucked) will still vibrate in sympathy with the one you plucked but
the effect will be much less pronounced and you may have to look very
closely at the wire not plucked to detect that it is vibrating.  Since you
have to adjust the tension in increments of 1/2 turn, not all pairs of
wires can be adjusted to exactly the same tension.

You can also use this method to check for equal tension on both sides of
the aircraft.  If the wires on both sides of the aircraft have exactly (or
very close to) the same tension, the wires on the other side of the
aircraft (the side not plucked) will vibrate in sympathy with wire you
plucked.   You may have to look very closely at the wires on the side not
plucked to detect this.

Best regards,

Neal Frangesh
IAC 4431


                


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