Incidence meters

[David Harmon]

HAHA

-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of wgalligan
Sent: Wednesday, May 21, 2003 9:50 PM
To: discussion at nsrca.org
Subject: Re: Incidence meters


jezz Matt... the last time I used a transit was 25 yrs ago when I was
pouring foundations for a house.    I'll stand over here with the
transit and then I'll have my wife hold the witching wand(transit rod)
and see which one gets level first.  The airplane or my wife.  With my
luck she probably walk over to me and smack me level to the ground.
heh! heh!
 
WG

-----Original Message-----
From: Rcmaster199 at aol.com <Rcmaster199 at aol.com>
To: discussion at nsrca.org <discussion at nsrca.org>
Date: Wednesday, May 21, 2003 7:15 PM
Subject: Re: Incidence meters


A couple of thoughts on this thread:

First, for a model that has progressed enough to have all the pieces
built-- the easiest way to get the various angles needed is with a
transit. There are alot of benefits, the most important of which is
this: the model doesn't need any fancy surface tables or any lazer beams
to get it level, because it really does not need to be level. All
measurements are made relative to the transit's plane of rotation, so
the model's attitude only needs to be adjusted to be parallel to this
plane. And if you want to be absolutely dead certain that stab and wing
are parallel, well that's straight forward also

Transits can be expensive devices but eBay may have something for cheap.
Learning to use one is not that tough really, and shouldn't pose a
problem for most any pattern flier.

The easiest way I have found to determine the zero thrust line on a
glass fuse, is with sewing thread. The center at the nose is fairly easy
to get exact, so I tie a length of thread from the nose center to the
tail post, at the appropriate height on the post so the fuse sets
properly. Scribe lines are then transcribed to the outside of the fuse.

My penny's worth FWIW

Matt Kebabjian




Subj:Re: Incidence meters 
Date:5/21/2003 5:41:30 PM Eastern Daylight Time
From:ojfrets at earthlink.net
Reply-to:discussion at nsrca.org
To:discussion at nsrca.org
Sent from the Internet 



I guess I'll keep doing the way I always do it. I was looking for an
easier
way to do the incidence. I do a bit scratch building, during the
building
process, lines reference lines are drawn on the wood surfaces. I
generally
level the plane to the work surface using the stab or the reference
markings as a reference point. Then mark a line that is parallel to the
work surface and measure from  that line and/or the work surface.
I use a string and line level for leveling for the setup. Works pretty
well
but is time consuming. Also pretty accurate.
Thanks to all who replied. This list is pretty good!!!!!!!!!!!!!!

Orlando


> [Original Message]
> From: Kenneth Blackwell <kblackw at snowhill.com>
> To: <discussion at nsrca.org>
> Date: 5/21/2003 9:28:41 AM
> Subject: Re: Incidence meters
>
> Paul,
>
> The line that you mentioned is the "zero thrust line" and it is
determined
> by the designer when the airplane is laid out. If you are starting
with a
> kit, the kit manufacturer should provide information that will allow
you
to
> set up the incidences corectly. Sometimes this is accomplished by
specifying
> how to set the fuselage up on a flat surface, by blocking up the tail
a
> specified amount. Then, you can measure up from that flat surface to
the
LE
> and TE....and calculate the incidence angle with trig....etc. etc.
Another
> way that manufacturers specify the incidences is by scribe lines or
mold
> lines on the sides of the fuselage.
>
> In the end, the most accurate way to determine incidences is by
measuring
> LE/TE from a good flat surface....as Jerry Budd has already stated
earlier.
> We need to be able to set incidences to an accuracy of about 0.1 deg
and
> this just isn't possible with any of the devices mentioned...so far.
>
> Cheers,
>
> Ken Blackwell
>
> ----- Original Message -----
> From: "Paul Lawrence" <pwl45 at yahoo.com>
> To: <discussion at nsrca.org>
> Sent: Wednesday, May 21, 2003 7:56 AM
> Subject: Re: Incidence meters
>
>
> > Speaking of incidence, what is the best way to find the thrust line
for
> > measuring the incidence?



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