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  #11  
Old 02-11-2016, 10:16 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,820
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Tim,

I'm a CFI. When I look for a DPE to work with I pass on ones that give check rides that don't reflect the PTS elements. There are some that seem overly impressed with themselves, and there are some that genuinely want to be sure the pilot they license is competent to deal with expected situations. You might want to shop around for another DPE.

Rich
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  #12  
Old 02-12-2016, 06:00 AM
sblack sblack is offline
 
Join Date: Dec 2009
Location: Montreal
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Quote:
Originally Posted by TLYNCH View Post
Good question Rich. Reason is I was warned that one of the examiners up here gives an oral for the practical test 5 hrs. long. At my age, 70.... I can't afford to fail....

I've wondered as you suggest about using anything but IAS ....especially since CAS & IAS are identical per the POH for the RV12.

Maybe the only real concern would be TAS adjusted for varying altitude/temp ?

I've wondered about other calculations like isogonic lines with similar interest....what difference do isogonics make anyway? ...we live in Wisconsin, a virtual AGONIC location. Plus 1 or 2 around here means lpassing an airport on the left vs. right side of the plane!

Sure hope I pass this exam. Any suggestions welcome.

Tim
It's probably good to have an idea of the difference between ias and cas for your airplane and tas is useful for dead reckoning for those that don't have a gps..is there anyone without a gps?? Eas is used for engineering calculations and has no practical purpose for a pilot that I can see.

For isogonics, you can't assume that you will always fly only in wisconsin!
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Old school simple VFR RV 4, O-320, wood prop, MGL iEfis Lite
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  #13  
Old 02-13-2016, 10:41 AM
RFSchaller RFSchaller is offline
 
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A good thumb rule for quick calculation of TAS is to add 2% of IAS for each 1000 feet above MSL. Seems to work pretty well at the altitudes the 12 flies at.

If you fly roughly the same altitude and power settings you can usually come up with an average cruise speed that will consistently put you within 5 or 6 minutes block to block on a two hour flight. For example a 300 NM flight in my Cherokee will consistently take 3 hours so I use 100 KTS GS for flight planning. Unless the wind is doing something really radical it works. Maybe not as accurate as getting out the E6B, but as they say: close enough for govrnment work.

Obviously you would want a more detailed calc if you know the wind is howling or, you're going IMC or your fuel state may be close to minimum at your destination. But for $100 hamburger trip on a CAVU day this approximation is completely adequate.
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  #14  
Old 02-13-2016, 10:51 AM
sblack sblack is offline
 
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Location: Montreal
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don't the 12s all have glass?
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Old school simple VFR RV 4, O-320, wood prop, MGL iEfis Lite
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  #15  
Old 02-13-2016, 07:28 PM
RFSchaller RFSchaller is offline
 
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If they are ELSA or SLSA they are glass. I think the discussion was mainly oriented toward preflight planning. Once in the air HAL will tell yo the right answer!.
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  #16  
Old 02-15-2016, 08:05 AM
esco esco is offline
 
Join Date: Jan 2011
Location: SoCal
Posts: 391
Default "Shop, Shop Around"

1. Rich (and the Miracles) offer good advice when it comes to a DPE:
My mama told me
you better shop around


2. A reasonable person won't expect you to know all the answers; rather, you should know where to find (some of) the answers.
(See Doug Reeves' gouge on prepping for his instrument exam:
http://www.vansairforce.net/articles..._checkride.htm

3. I passed the private written; you can too!
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RV10 sold (miss that one too!)
RV-14A build underway
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  #17  
Old 02-15-2016, 08:29 PM
TLYNCH TLYNCH is offline
 
Join Date: Apr 2013
Location: Mequon, WI
Posts: 114
Default TAS EAS IAS GS

Thank you Rich, Scott.
All good advice....appreciate the 2% calculation.

Btw.....what's the miracles?
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RV-12. SLSA

Paid $50 for this year. Priceless !
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  #18  
Old 02-15-2016, 10:42 PM
paul330 paul330 is offline
 
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Location: Mpumalanga, South Africa
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When I was in the RAF, we were told that Instrument Rating Examiners and Testers (IRET) were picked (PICD):-

IAS - Pressure Error, Instrument Error - RAS - Compressibility - EAS - Density Error - TAS

See! I still remember after all these years.
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Mercy Air, White River FAWV
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  #19  
Old 02-16-2016, 06:29 AM
esco esco is offline
 
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Location: SoCal
Posts: 391
Default the Miracles

original artists to record "Shop Around" with Smokey Robinson lead vocals.

And now back to the original topic...
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RV-14A build underway
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  #20  
Old 02-16-2016, 09:21 PM
RFSchaller RFSchaller is offline
 
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Paul,

I'll always remember ICET (ice tea) somewhere in my past a CFI beat that into my hard head!

Rich
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