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March 7th, 2007, 23:06
| #1 |
| Junior Member  Join Date: Feb 2007 Location: Boston
Posts: 103
|  Partial panel with a dry compass? Anyone here have experience doing compass turns with a dry compass? I was teaching my instrument student compass turns the other day and it was my first time using a dry compass for partial panel. The darn thing was so unpredictable. Sometimes on a turn to 360 we would have had to lead the turn by 30 degrees to get it right and other times 70 degrees is what would have worked. Do you guys know any tricks for dry compasses? |
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March 7th, 2007, 23:27
| #2 |
| Old Skool  Join Date: Nov 2000 Location: Spokane, WA
Posts: 6,514
| Re: Partial panel with a dry compass? What's a dry compass? Are you talking vertical card compass? In any case, I don't see where compass turns are required anymore. Timed turns using the compass make a lot more sense and that's all I ever taught.
__________________ Click here to see how I became a UPS pilot http://www.jetcareers.com/content/view/65/132/ |
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March 7th, 2007, 23:31
| #3 | |
| Old Skool  Join Date: Oct 2005 Location: ROC
Posts: 2,208
| Re: Partial panel with a dry compass? Quote:
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March 8th, 2007, 00:14
| #4 |
| Old Skool  Join Date: Mar 2004 Location: Ft. Lauderdale
Posts: 2,090
 | Re: Partial panel with a dry compass? Im so glad you brought this up...we all know about the 0, 10, 20, 30 degree trick for doing htem....so i teach this guy in his 182 and i felt like an idiot cuz the numbers didnt work...what we were able to do was do it enough times to get the right numbers (mostly)...so north and the 30 degree marks are a 20 degree error, while the 60 is like 10 degrees, and E/W still being zero (south, same deal). I do agree though that sometimes the numbers just dont work...5 degrees error is ok, but sometimes it was like 10 or so... So a question on a question....Can you not do compass turns with a vertical card?
__________________ Don't call her a babe, ok? She is a Chechnyan prostitute, and you will address her as such! -ATHF |
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March 8th, 2007, 15:19
| #5 |
| Junior Member  Join Date: Jul 2006 Location: Boulder, Colorado
Posts: 271
| Re: Partial panel with a dry compass? I always just take the number of degrees I want to turn and divide by 3 for time. (30 degree turn 10 seconds at standard rate). Unaccelerated flight how did I do? Make another correction if I have to -Jason |
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March 8th, 2007, 19:45
| #6 | |
| Senior Member  Join Date: Aug 2005 Location: WA
Posts: 556
| Re: Partial panel with a dry compass? Quote:
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March 9th, 2007, 11:15
| #7 |
| Old Skool Join Date: Mar 2004 Location: Ft. Lauderdale
Posts: 2,090
| Re: Partial panel with a dry compass? We're talking about compass turns people...not timed.
__________________ Don't call her a babe, ok? She is a Chechnyan prostitute, and you will address her as such! -ATHF |
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March 11th, 2007, 11:37
| #9 |
| Old Skool Join Date: Mar 2004 Location: Ft. Lauderdale
Posts: 2,090
| Re: Partial panel with a dry compass? So no one has an answer?
__________________ Don't call her a babe, ok? She is a Chechnyan prostitute, and you will address her as such! -ATHF |
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March 11th, 2007, 18:03
| #10 | |
| Old Skool  Join Date: Oct 2005 Location: KBOS
Posts: 2,732
  | Re: Partial panel with a dry compass? The whole point of a vertical card compass is to not have the lead/lag erros of a wet compass. The problem is vertical compasses, compii, whatever...are very prone to damage. So much that if you install one with a Magnetic screwdriver the thing is screwed. If you lay a flashlight or a headset next to it...screwed. Errors as much as 40 degrees. An A&P and I did alot of work with this because when I was a senior instructor at our flight school our piper arrow had a vertical card compass and an examiner failed a student for incorrect compass turns. Student/instructor blamed the airplane, which in turn the school blamed the owner and the owner blamed the mechanic. Turns out if you disassemble the compass the magnet is held in the gimble with a small pin that can easily get dislodged with another magnet being close. To prove it to a examiner we installed a brand new vertical card took it to the compass rose and did a swing test. Then placed a headset next to the compass for 5 mins and did the swing test again. Some headings it was correct and some had errors as much as 30 to 40 degrees.
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March 14th, 2007, 23:40
| #11 |
| Junior Member Join Date: Feb 2007 Location: Boston
Posts: 103
| Re: Partial panel with a dry compass? Great reply Mike! Thanks much! |
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