Get a compass that mounts on the glare shield...bigrenna wrote: And as far as where to hang the compass goes... thats what double stick tape is for.
Dumb Question- Windscreen
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- cessna170bdriver
- Posts: 4066
- Joined: Mon Apr 22, 2002 5:13 pm
Re: Dumb Question- Windscreen
Miles
“I envy no man that knows more than myself, but pity them that know less.”
— Thomas Browne
“I envy no man that knows more than myself, but pity them that know less.”
— Thomas Browne
Re: Dumb Question- Windscreen
Needing the hole in my panel presently occupied by the compass, I recently bought a new compass, to be mounted at the top of the windshield ... way, way up where it won't obstruct my view out the windshield.
Re: Dumb Question- Windscreen
Well I'm somewhat shocked because and I really hate to break this to you guys but none of us are making sense to those not owning a plane.BR Wrote "You guys make absolutely no sense to me...
Fortunately there's strength in numbers, enough of us spending money on our planes and spending additional cash to make them into what we individually want. If only one person was doing it...wham, off to a locked white room with a view.
Last edited by c170b53 on Sat Dec 06, 2014 4:36 pm, edited 1 time in total.
Jim McIntosh..
1953 C170B S/N 25656
02 K1200RS
1953 C170B S/N 25656
02 K1200RS
- daedaluscan
- Posts: 497
- Joined: Fri Apr 20, 2012 7:03 pm
Re: Dumb Question- Windscreen
At the risk of thread drift, which compass would anyone recommend to mount on a strapless windscreen. Mine is in the panel and is unreliable, maybe the iphone near it or something else but I just dont trust it.
Charlie
1956 170B C-GDRG #27019
1956 170B C-GDRG #27019
Re: Dumb Question- Windscreen
Vibration alone will many times impart magnetism to iron/steel objects. (Take a long I-beam or piece of steel and align it N/S and hit it on the end with a hammer a couple dozen times and it will take on the properties of a large compass. Reverse it and hit it an equal number of times and it will neutralize again..and so forth and so on... Electro-Weld on it and watch what happens. (wonder why acetylene welding is so popular on steel-tube airframes.....??? Nonetheless.... steel tube airframes will take on a magnetic flux all their own after a while and need to be degaussed or have the compass swing redone regularly. )
I seem to remember our airplanes vibrate. Anyway... your flight controls, such as the steel-tube "T" and the chains, and yoke-shafts etc etc are ferrous and will influence a compass. (If you sit still and move your flight controls fully as in a pre-flight check, you might see your compass movement.) The trick is to realize your flight controls, while in-flight, rest largely in the neutal postion and you should swing your compass accordingly.
The alternative is to relocate your compass.... and/or.... de-magnetize your control system. (This subject as to removing/demagnetizing, i.e., "degaussing" entire aircraft and/or subsystems has been discussed in these forums previously.)
Ideally, your compass should be swung in-flight...and in a retractible gear airplane with the gear UP...but unfortunately that is impractical. The next-best method is to use an airport compass-rose with your airplane engine running, your usual lights ON (remember, land/taxi lights are only intermittent...don't swing a compass with them "on") and with your tail UP as in level-flight ,also with your flight controls in a neutral position. This can be a tedious process and most folks are satisfied to do this with the tailwheel on the ground.
You can get reasonably close by flying in the mid-west along property lines which align with cardinal directions. (You will need lots of time and have a safety pilot keep an eye out for green planes so you don't run up their tails.)
My own '53 model has it's compass located in it's original position in the panel. I can cause the compass to swing on the ground slightly with control movement, but in the neutral position I was actually able to remove virtually all the meaningful errors from my compass using the compass rose at the local airport and confirming it in-flight with the GPS flying triangular courses.
Hope this line of thought is useful.
I seem to remember our airplanes vibrate. Anyway... your flight controls, such as the steel-tube "T" and the chains, and yoke-shafts etc etc are ferrous and will influence a compass. (If you sit still and move your flight controls fully as in a pre-flight check, you might see your compass movement.) The trick is to realize your flight controls, while in-flight, rest largely in the neutal postion and you should swing your compass accordingly.
The alternative is to relocate your compass.... and/or.... de-magnetize your control system. (This subject as to removing/demagnetizing, i.e., "degaussing" entire aircraft and/or subsystems has been discussed in these forums previously.)
Ideally, your compass should be swung in-flight...and in a retractible gear airplane with the gear UP...but unfortunately that is impractical. The next-best method is to use an airport compass-rose with your airplane engine running, your usual lights ON (remember, land/taxi lights are only intermittent...don't swing a compass with them "on") and with your tail UP as in level-flight ,also with your flight controls in a neutral position. This can be a tedious process and most folks are satisfied to do this with the tailwheel on the ground.
You can get reasonably close by flying in the mid-west along property lines which align with cardinal directions. (You will need lots of time and have a safety pilot keep an eye out for green planes so you don't run up their tails.)
My own '53 model has it's compass located in it's original position in the panel. I can cause the compass to swing on the ground slightly with control movement, but in the neutral position I was actually able to remove virtually all the meaningful errors from my compass using the compass rose at the local airport and confirming it in-flight with the GPS flying triangular courses.
Hope this line of thought is useful.
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
Re: Dumb Question- Windscreen
That Green airplane you refer to George is the one that just passed you
OLE POKEY
170C
Director:
2012-2018
170C
Director:
2012-2018
Re: Dumb Question- Windscreen
I just bought a SIRS compass with the long arm. It was cheaper than an Airpath, and as much as I hated spending even a penny on a whiskey compass, I just didn't want to mess with a used one. The compass comes with a sticky pad for mounting, but I don't know if that's a legal way to mount it. If not I'll make a mount that uses the windshield screws at top center.daedaluscan wrote:At the risk of thread drift, which compass would anyone recommend to mount on a strapless windscreen. Mine is in the panel and is unreliable, maybe the iphone near it or something else but I just dont trust it.
Re: Dumb Question- Windscreen
I'm holding my breath until the FAA removes the magnetic compass from the minimum equipment list.
It has to be the most useless instrument in the panel.
It has to be the most useless instrument in the panel.
- sfarringer
- Posts: 309
- Joined: Wed Jan 12, 2005 10:49 pm
Re: Dumb Question- Windscreen
So, what do you set your directional gyro to?bagarre wrote:I'm holding my breath until the FAA removes the magnetic compass from the minimum equipment list.
It has to be the most useless instrument in the panel.
I find the magnetic compass to be a pretty useful instrument.
I use my GPS, but I don't totally rely on it.
Ragwing S/N 18073
Re: Dumb Question- Windscreen
I don't. I set my destination in of of 5 GPS devices and follow the magenta brick road.sfarringer wrote:So, what do you set your directional gyro to?bagarre wrote:I'm holding my breath until the FAA removes the magnetic compass from the minimum equipment list.
It has to be the most useless instrument in the panel.
I find the magnetic compass to be a pretty useful instrument.
I use my GPS, but I don't totally rely on it.
-
- Posts: 3481
- Joined: Sat May 06, 2006 6:05 pm
Re: Dumb Question- Windscreen
The whole GPS constellation can be turned off with the flip of a switch. I witnessed it back in about 1999 when they did a test. One second it's there, the next its gone. Kinda unnerving. I, like most others rely heavily on GPS. I don't use charts on a regular basis but when I go somewhere unfamiliar, I always have chart backup, even if they never get used.
Using the compass? I can't remember the last time, but when the EMP strikes, it will be there when I need it.
Using the compass? I can't remember the last time, but when the EMP strikes, it will be there when I need it.
Richard Pulley
2014-2016 TIC170A Past President
1951 170A, N1715D, s/n 20158, O-300D
Owned from 1973 to 1984.
Bought again in 2006 after 22 years.
It's not for sale!
2014-2016 TIC170A Past President
1951 170A, N1715D, s/n 20158, O-300D
Owned from 1973 to 1984.
Bought again in 2006 after 22 years.
It's not for sale!
Re: Dumb Question- Windscreen
By that same reasoning, the Navy should still have sextants on board with people that know how to use them.hilltop170 wrote:The whole GPS constellation can be turned off with the flip of a switch. I witnessed it back in about 1999 when they did a test. One second it's there, the next its gone. Kinda unnerving. I, like most others rely heavily on GPS. I don't use charts on a regular basis but when I go somewhere unfamiliar, I always have chart backup, even if they never get used.
Using the compass? I can't remember the last time, but when the EMP strikes, it will be there when I need it.
Re: Dumb Question- Windscreen
They don'tbagarre wrote:By that same reasoning, the Navy should still have sextants on board with people that know how to use them.hilltop170 wrote:The whole GPS constellation can be turned off with the flip of a switch. I witnessed it back in about 1999 when they did a test. One second it's there, the next its gone. Kinda unnerving. I, like most others rely heavily on GPS. I don't use charts on a regular basis but when I go somewhere unfamiliar, I always have chart backup, even if they never get used.
Using the compass? I can't remember the last time, but when the EMP strikes, it will be there when I need it.
John E. Barrett
aka. Johneb
Sent from my "Cray Super Computer"
aka. Johneb
Sent from my "Cray Super Computer"
- daedaluscan
- Posts: 497
- Joined: Fri Apr 20, 2012 7:03 pm
Re: Dumb Question- Windscreen
Guess I am a dinosaur, I recently sailed across the Pacific and took a sextant and tables with me. Never used it except for fun, but personally I think crossing an ocean without one is foolhardy. I would be absolutely amazed if every Navy ship was not equipped and practiced.
Charlie
1956 170B C-GDRG #27019
1956 170B C-GDRG #27019