Urgent ! Incidence Meter Question

[Rcmaster199 at aol.com]

Along Kenny's line of thinking, a height gauge is the device of choice for 
vertical measurements. I have written about that before but it's worth 
repeating. It's a device that has a vertically moving pointer/slider, which moves on a 
graduated rule which is itself mounted on a base. Practically all the 
measurement device manufacturers (micrometers and such, Mitotuyo, Browne and Sharpe, 
etc) make these. Either the digital readout type or mechanical analog type is 
fine, but I prefer the analog type; they are very inexpensive on the order of 
30-50$ or so for the analog. The new Chinese offerings are even less than that. 
Harbor Freight Tools is a good source for the Chinese height gauges

The carbide scribe pointer can be used to good advantage to actually scribe 
markings on the fuse sides. The markings will be as accurate as your surface 
table.

BTW wing accuracy is simple to check with such a device. 

"If you can't measure it, you don't know when you have it made"

Matt K


> Subj:Re: Urgent ! Incidence Meter Question 
> Date:1/25/2004 7:51:08 AM Eastern Standard Time
> From:blackwellk at snowhill.com
> Reply-to:discussion at nsrca.org
> To:discussion at nsrca.org
> Sent from the Internet 
> 

> 
> 
> 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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