Hello from Boston

bagarre · Post by **bagarre** » Thu Aug 18, 2016 3:04 pm

rusbac wrote:Good idea - Added to my list of things to do this weekend. Every time I look under there I learn something new!

Oh, how I know that feeling.

rusbac · Post by **rusbac** » Mon Sep 12, 2016 3:37 pm

As the Mythbusters would say: "Well there's your problem..."
New rheostat on the way.

IMG_20160909_194520482_HDR.jpg

In the mean time, we took a trip down the Hudson River corridor!

NYC night hudson.jpg

Post by **Bruce Fenstermacher** » Mon Sep 12, 2016 4:02 pm

Kind of lucky the rheostat even turned on and off.

Post by **Bruce Fenstermacher** » Mon Sep 12, 2016 4:04 pm

BTW a correct rheostat for this application is not likely to be closed back as that one was. Your burnt up rheostat was probably to small which is why you found it in the condition you did. Your replacement will likely have an open element.

bagarre · Post by **bagarre** » Mon Sep 12, 2016 4:23 pm

How expensive is a new one?
I wonder if you could get that one re-wound.

rusbac · Post by **rusbac** » Mon Sep 12, 2016 4:27 pm

It had no markings on it so I don't know the specs, but it does look almost identical to this one:
http://cessna170.org/forums/viewtopic.php?f=24&t=5399

rusbac · Post by **rusbac** » Mon Sep 12, 2016 4:39 pm

After we opened it and poked it, the insides sort of just crumbed to dust. A new one was only $35. I went with a 25W, 100 Ohm, open backed version that was recommended elsewhere on the forum. We'll see how that goes

bagarre wrote:How expensive is a new one?
I wonder if you could get that one re-wound.

Post by **Bruce Fenstermacher** » Mon Sep 12, 2016 4:48 pm

This is what they look like:

Ohmite rheostat.jpg

But looks are not important. What is important is that the rheostat is sized correctly for the load in the circuit it is installed in. The number of and type of bulbs in the circuit determine the load. This is why you don't want to change bulbs, add or subtract bulbs willy nilly to this circuit.

n3833v · Post by **n3833v** » Mon Sep 12, 2016 4:51 pm

That trip down the Hudson looks great and you could see where Sully put the plane.

Ryan Smith · Post by **Ryan Smith** » Mon Sep 12, 2016 6:53 pm

rusbac wrote:After we opened it and poked it, the insides sort of just crumbed to dust. A new one was only $35. I went with a 25W, 100 Ohm, open backed version that was recommended elsewhere on the forum. We'll see how that goes

bagarre wrote:How expensive is a new one?
I wonder if you could get that one re-wound.

Doubtful it will work well, Christine. I got one with those specs at first and it only acted as a switch, sort of.

I ended up getting this one from Aircraft Spruce.

http://m.aircraftspruce.com/catalog/elp ... eostat.php

I'm pretty sure it's the 0-15ohm version. I can check later today.

The International Cessna^® 170 Association

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