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08-20-2016, 01:54 PM
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Join Date: May 2014
Location: KBVY Massachusetts
Posts: 1,092
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What is the definition of "color mark" for airspeed indicator
Hi all,
I'm looking at the Van's UMA airspeed indicators - 2-1/4" in knots. What is the column "color marks" and how is it read? I'm assuming it has something to do with the white, yellow green red lines but I don't know what "3/4/6" or "7/8" or "9" means. Can someone please translate?
Also there's one advertised by Van's with model number: UMA-16-211-201
But I can't find that on the UMA catalog to determine the speed range (I would prefer 40 to 240). Should be simpler to figure out what is being sold.
thanks
__________________
Flying RV-8 N880BC
2019 Dues - happily paid.
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08-20-2016, 02:01 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,027
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It means that particular instrument has color markings at the airspeed values appropriate for the RV model(s) listed.
I.E., red line speed, top and bottom of green arc, etc.
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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08-20-2016, 02:08 PM
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Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,428
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That particular 2 1/4" AIS is marked for the RV-3, RV-4 or RV-6 and scaled for knots.
The flap speed is 87 kts and the redline is 183 kts.
Since the ASI goes to 210 kts, that's a little over 240 mph. If you wanted mph, that's the IF UMA-16-210-241 airspeed indicator.
Dave
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08-20-2016, 02:21 PM
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Join Date: May 2014
Location: KBVY Massachusetts
Posts: 1,092
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Quote:
Originally Posted by rvbuilder2002
It means that particular instrument has color markings at the airspeed values appropriate for the RV model(s) listed.
I.E., red line speed, top and bottom of green arc, etc.
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Oh yes of course. Thanks!
__________________
Flying RV-8 N880BC
2019 Dues - happily paid.
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08-20-2016, 02:21 PM
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Join Date: May 2014
Location: KBVY Massachusetts
Posts: 1,092
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Quote:
Originally Posted by David Paule
That particular 2 1/4" AIS is marked for the RV-3, RV-4 or RV-6 and scaled for knots.
The flap speed is 87 kts and the redline is 183 kts.
Since the ASI goes to 210 kts, that's a little over 240 mph. If you wanted mph, that's the IF UMA-16-210-241 airspeed indicator.
Dave
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Hi Dave,
I'm looking to replace my MPH AI with knots.
__________________
Flying RV-8 N880BC
2019 Dues - happily paid.
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08-20-2016, 07:26 PM
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Join Date: Mar 2014
Location: Laguna Hills, CA
Posts: 1,805
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It's super-handy that Van's offers the pre-marked gauges. I like the conventional ASI to back up the EFIS.
__________________
Doug
RV-9A "slider"
Flew to Osh in 2017, 2018 & 2019! 
Tail number N427DK
Donation made for 2020
You haven't seen a tree until you've seen its shadow from the sky -- Amelia Earhart
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08-21-2016, 05:05 AM
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Join Date: May 2014
Location: KBVY Massachusetts
Posts: 1,092
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Quote:
Originally Posted by rightrudder
It's super-handy that Van's offers the pre-marked gauges. I like the conventional ASI to back up the EFIS.
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Yes very handy. I, too, like to have steam gauge backups for things. Especially Airspeed. I'd like the EFIS, GPS and steam to all be in knots.
__________________
Flying RV-8 N880BC
2019 Dues - happily paid.
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08-21-2016, 05:17 PM
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Join Date: Mar 2014
Location: Laguna Hills, CA
Posts: 1,805
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Quote:
Originally Posted by Saville
Yes very handy. I, too, like to have steam gauge backups for things. Especially Airspeed. I'd like the EFIS, GPS and steam to all be in knots.
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Yeah, I'm a knots guy too. The only thing I like to see in mph is ground speed.
__________________
Doug
RV-9A "slider"
Flew to Osh in 2017, 2018 & 2019!
Tail number N427DK
Donation made for 2020
You haven't seen a tree until you've seen its shadow from the sky -- Amelia Earhart
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