Incidence Meter
11-11-2006 | 05:39 PM
#1
Thread Starter
My Feedback: (3)
Incidence Meter
I posted this on a different thread and got a couple of e-mails that I should post it here.
Years ago I needed a second incidence meter and couldn't get to a hobby shop so I whipped this one up out of 1/4" balsa. The left vertical is a snug fit on the horizontal and the notches were cut after assembly and after marking with a square. Put a small bubble level on top (I use a line level) and you've got a no cost incidence meter.
It measures dead on with my Robart meter. It won't tell you degrees but for 0-0 measurements it's great.
Dave
Years ago I needed a second incidence meter and couldn't get to a hobby shop so I whipped this one up out of 1/4" balsa. The left vertical is a snug fit on the horizontal and the notches were cut after assembly and after marking with a square. Put a small bubble level on top (I use a line level) and you've got a no cost incidence meter.
It measures dead on with my Robart meter. It won't tell you degrees but for 0-0 measurements it's great.
Dave
11-14-2006 | 04:28 PM
#7
Senior Member
Joined: Jul 2006
Posts: 723
Likes: 0
Received 0 Likes
on
0 Posts
From: Charlottesville,
VA
RE: Incidence Meter
ORIGINAL: low@slow
I agree, A flat table, a ruler and a calculator is all you need.
I agree, A flat table, a ruler and a calculator is all you need.
And some trig knowledge.
It's been a while for me. Would you mind sharing the necessary formulas?
11-17-2006 | 05:51 PM
#8
RE: Incidence Meter
As you may remember that sin over cos is tan and therefore it is the equiv of oppisite leg which would be your difference in height between leading and trailing edges measured off your table top over the adjacent leg which is chord of your wing. Plug this number into your calculator and it shoud give the degrees of incidence.
11-17-2006 | 06:55 PM
#9
Senior Member
RE: Incidence Meter
Actually you don't need to know any math at all.
Transfer your measurements to a piece of paper and measure the angles. Use a protractor. You can buy them for under $1 some places.
You can also simply attach the protractor to the neat frameworks shown in the pictures above. Attach a plumb bob (can make that for under $.05) and you've got as accurate an incidence meter as one you'd pay lots more than a dollar for and it cost you almost nothing.
You know, there is almost always more than one right way to do a job.
Transfer your measurements to a piece of paper and measure the angles. Use a protractor. You can buy them for under $1 some places.
You can also simply attach the protractor to the neat frameworks shown in the pictures above. Attach a plumb bob (can make that for under $.05) and you've got as accurate an incidence meter as one you'd pay lots more than a dollar for and it cost you almost nothing.
You know, there is almost always more than one right way to do a job.
