Urgent ! Incidence Meter Question

[Thomas C. Weedon]

I use an old surface gage with a dial indicator to check the leading and
trailing edges on my planes. I doubt that my bench, a large, thick, wood
covered steel door is that accurate. So everything is just a compromise at
best.

Tom W.
  -----Original Message-----
  From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On
Behalf Of Kenneth Blackwell
  Sent: Sunday, January 25, 2004 6:16 AM
  To: discussion at nsrca.org
  Subject: Re: Urgent ! Incidence Meter Question


  Scott,

  Incidence meters of all types are generally not accurate enough for
pattern use. You need an accuracy of  0.1 deg. I have an electronic digital
level that will read to 0.1 deg and I only use it for cross checks. Although
the readout is good to 0.1 deg, the overall accuracy isn't that good. If you
have a good flat table...the very best way is to set the fuse on the table
and measure up to the centers of wing/stab LE/TE then with trig calculate
the incidence angle. To do this you need an accurate vertical
measurementwith an accuracy of 1/64" or better. On the Focus I and II the
bottom of the fuselage is zero incidence. Both wing and stab should be set
to specifications provided by Piedmont from this reference.

  Cheers,

  Ken Blackwell
  Precision Model Design
  blackwellk at snowhill.com
    ----- Original Message -----
    From: Scott Pavlock
    To: NSRCA Discussion Page
    Sent: Saturday, January 24, 2004 7:20 PM
    Subject: Urgent ! Incidence Meter Question


      I am currently installing my wing adusters on my Focus 2 and I am
trying to calibrate my Great Planes Incidence Meter. I placed the meter on a
perfectly level table and set it for Zero Degrees. I decided to rotate the
device 180 to see if it would still be level (the laser was roughly facing
north and now is facing south). The degrees changed positive 1/2 degree. I
thought I might have moved the placement of the laser so I secured
everything possible with tape and rotated it again. Same thing. Does anyone
know what might be the problem???

      Thanks in advance!
      _______________________________________________________________
      Scott Pavlock

      photos.yahoo.com/f3aflyer7
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