Cool tachometer ID
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Joined: Oct 2002
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From: The Big, Oregon
Cool tachometer ID
I had this old tachometer given to me this weekend, and would like to find out some info on it. It's made by GE, and I believe came from an aircraft as there are some markings on a sticker that has a pair of wings with 174 in the center and either JAX or OAX under it. That same sticker also says "ready for issue 17 JUN 1947".
It just looks cool-
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It's odd because most aircraft tachs I can find are a single sweep 3500rpm gauge, this is the first I have seen that is a multi-rotation with a smaller dial for the thousands. I was thinking of making a nice brushed aluminum mount for it with maybe some circuitry and a battery to actuate it, with a dial to vary the rpm indicated as a desk toy.
All the searches I have done on the part numbers have come up with weird stuff, no pictures and some references to a Kollsmann indicator but nothing about a GE one.
Does anyone have info on this tach, specifically what sort of plane it would have come from?
It just looks cool-
ID tag:
It's odd because most aircraft tachs I can find are a single sweep 3500rpm gauge, this is the first I have seen that is a multi-rotation with a smaller dial for the thousands. I was thinking of making a nice brushed aluminum mount for it with maybe some circuitry and a battery to actuate it, with a dial to vary the rpm indicated as a desk toy.
All the searches I have done on the part numbers have come up with weird stuff, no pictures and some references to a Kollsmann indicator but nothing about a GE one.
Does anyone have info on this tach, specifically what sort of plane it would have come from?
Cargo Master
Joined: Apr 2003
Posts: 3,476
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From: Frequently frozen MN
Negative results in my brief searches, which were surely less thorough than yours.
But, I wonder if you might try to find some arcraft cockpit pics from that era. I've seen some sites that offer good ones, but I can't recall right now. (Maybe the Wright Patterson AF museum and others like that).
JAX is quite possibly Jacksonville, which has a Navy base if I have my facts straight.
The other thought is that since they've expanded the 100's scale, RPM might be critical. I saw a lot of stuff about motor generators -- sometimes used to generate 50Hz power. It could be that it's from something like that where they need the frequency to be exact.
Good Luck,
hj
But, I wonder if you might try to find some arcraft cockpit pics from that era. I've seen some sites that offer good ones, but I can't recall right now. (Maybe the Wright Patterson AF museum and others like that).
JAX is quite possibly Jacksonville, which has a Navy base if I have my facts straight.
The other thought is that since they've expanded the 100's scale, RPM might be critical. I saw a lot of stuff about motor generators -- sometimes used to generate 50Hz power. It could be that it's from something like that where they need the frequency to be exact.
Good Luck,
hj
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Joined: Dec 2005
Posts: 10,253
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From: Chino Valley, Arizona
the second line is the customer part number (r-88-1-2385-100) the dash 100 is the first model of this tach. so any upgrades would have been -101 or -102
the part number layout seems to come up as lockheed part number sequence. but my internet is slower than dial up right now so I am not having any luck searching right now
the part number layout seems to come up as lockheed part number sequence. but my internet is slower than dial up right now so I am not having any luck searching right now
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Hotshot
Joined: Oct 2002
Posts: 18,488
Likes: 22
From: The Big, Oregon
Negative results in my brief searches, which were surely less thorough than yours.
But, I wonder if you might try to find some arcraft cockpit pics from that era. I've seen some sites that offer good ones, but I can't recall right now. (Maybe the Wright Patterson AF museum and others like that).
JAX is quite possibly Jacksonville, which has a Navy base if I have my facts straight.
The other thought is that since they've expanded the 100's scale, RPM might be critical. I saw a lot of stuff about motor generators -- sometimes used to generate 50Hz power. It could be that it's from something like that where they need the frequency to be exact.
Good Luck,
hj
But, I wonder if you might try to find some arcraft cockpit pics from that era. I've seen some sites that offer good ones, but I can't recall right now. (Maybe the Wright Patterson AF museum and others like that).
JAX is quite possibly Jacksonville, which has a Navy base if I have my facts straight.
The other thought is that since they've expanded the 100's scale, RPM might be critical. I saw a lot of stuff about motor generators -- sometimes used to generate 50Hz power. It could be that it's from something like that where they need the frequency to be exact.
Good Luck,
hj
This may have been from an aircraft that used a variable pitch prop, where rpm needed to be fairly constant and the pitch changed.
It's hard to tell given the interchangeability of Mil-spec stuff. I just thought it'd be cool to have some sort of a backstory to this piece.
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