Saville
Well Known Member
Hi all,
I would like to replace my steam gauge Air Speed Indicator (ASI). The one that came with the airplane has the units of MPH and I want to change that to knots.
The present gauge is a 2 1/4" diameter instrument and I want to replace it with a 2.25".
IN the following picture, it's the second gauge from the right in the lower right hand corner of the picture:
First I looked at the Van's web page and I see this:
IF UMA-16-211-242 7/8 KNOTS NONE NO UMA (2.25")
(the NONE and NO means no light and no inner scale).
Ok that looks good.
I look on the UMA page to get it's dimensions and see how it looks and I see this:
16-210-240 40-240 MPH -
Above ranges are available in Knots.
Part number changes to 16-211-XXX
Ok so it looks like I want the 16-211-240 from UMA But Van's calls it a 16-211-242.
1. Why does UMA have different model numbers than Van's? Is it the same device? Why does Van's call it a -242 and UMA calls it a -240?
2. If you look at the present instrument in the panel picture above, it looks like the "flange" is behind the panel. That suggests to me that the flange is threaded. Is that correct? On the UMA there seems to be a substantial flange and it looks as if it goes on the front of the panel.
- there's room for the flange around the instrument on the panel. I can use nuts and bolts, Perhaps the flange is the same on the one I have in the airplane but it's just behind the panel.
- When I do a web search on the 16-211-240 it looks just like the -242 as regards the flange.
I measured the distance between the mounting screws on the airplane and they match the UMA installation picture. for the UMA -240.
I do not know whether to order the Van's -242 or the UMA -240
Any suggestions?
Thanks!
I would like to replace my steam gauge Air Speed Indicator (ASI). The one that came with the airplane has the units of MPH and I want to change that to knots.
The present gauge is a 2 1/4" diameter instrument and I want to replace it with a 2.25".
IN the following picture, it's the second gauge from the right in the lower right hand corner of the picture:
First I looked at the Van's web page and I see this:
IF UMA-16-211-242 7/8 KNOTS NONE NO UMA (2.25")
(the NONE and NO means no light and no inner scale).
Ok that looks good.
I look on the UMA page to get it's dimensions and see how it looks and I see this:
16-210-240 40-240 MPH -
Above ranges are available in Knots.
Part number changes to 16-211-XXX
Ok so it looks like I want the 16-211-240 from UMA But Van's calls it a 16-211-242.
1. Why does UMA have different model numbers than Van's? Is it the same device? Why does Van's call it a -242 and UMA calls it a -240?
2. If you look at the present instrument in the panel picture above, it looks like the "flange" is behind the panel. That suggests to me that the flange is threaded. Is that correct? On the UMA there seems to be a substantial flange and it looks as if it goes on the front of the panel.
- there's room for the flange around the instrument on the panel. I can use nuts and bolts, Perhaps the flange is the same on the one I have in the airplane but it's just behind the panel.
- When I do a web search on the 16-211-240 it looks just like the -242 as regards the flange.
I measured the distance between the mounting screws on the airplane and they match the UMA installation picture. for the UMA -240.
I do not know whether to order the Van's -242 or the UMA -240
Any suggestions?
Thanks!