Skylane Cruising Speeds

Skylane Cruising Speeds

I have a contract on a 1966 182 with fresh annual, good compression (300SMOH), 0 time prop.  I am surprised to find that I am only cruising at 135mph at 2500.  Haven't had her to altitude yet, but the current owner says not to expect much more.  I seen several specs putting it at 140KPH true.  Any thoughts on why so slow?

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Re: Skylane Cruising Speeds

I have a 66 172 and I cruise at about 118 mph at 2500'. My poh says i should cruise at 120knts. I think that cessna was a little over optimistic on their cruise speends. I look forward to hearing some explantions for this.

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Re: Skylane Cruising Speeds

The typical Skylane should cruise at 5500' - 7500' at 140-144 kts, burning approx 13 gph, using 24" and 2400 rpm.  I used to cruise it at 23"/2300 rpm and it trued 135 -140 kts depending upon weight and density altitude.

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Re: Skylane Cruising Speeds

George,

I read with great interest your 2001 forum discussion comparing the Bonanza to the 182.  In fact doing so increased my concerns about this aircraft.  I'm having a second survey done on the aircraft to address this very concern.  Any thoughts on what could be the reason or what to look for.  I'm sold on the 182 but need to cruise closer to POH specs.  Thanks for your feedback.
Jeff

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Re: Skylane Cruising Speeds

Jeff,
You mentioned going "135 MPH at 2500 but not at altitude yet".  I assume the 2500 is RPM, not altitude, correct?  If so, what MP were you running with 2500 RPM?  Could the Tach be off?  Could the MP gauge be off?  Could BOTH be off and combined are giving you low cruise speeds?  Have you tried it at 7500' just to see what it does?  Just a thought or 2.
Bob

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Re: Skylane Cruising Speeds

My 1972 Skylane will consistently cruise at 150 mph.  Depending on the winds, a bit more or sometimes less.

Are you talking ground speed on a GPS or the indicated on the gage?

I fly in the Rocky Mts. usually around 10,000 ft @ 2300 RPM just backed off of full throttle (just enough to detect a decline in MP).  That seems to even out the EGT's a bit, otherwise they are pretty scattered.

The best speed I have caught so far was 223 mph on a return trip from Farmington, NM.  Probably somewhere in the neighborhood of a 75 mph tail wind!

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Re: Skylane Cruising Speeds

<HTML>In a 182J, I usually get between 135 and 145 mph at 23/23 - low altitude</HTML>

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Re: Skylane Cruising Speeds

Thanks for all the feed back.  I did my test flight at 2500 feet, at 2500 rpm and 23 MP.  Indicated airspeed was 135 mph (120 kph).  True was not observed, but the owner indicated cruise speed of 135mph at altitude.  I didn't clarify True/Indicated but assumed True since the aircraft is equipped with GPS.  It was a hot/wet day, so I suspect I can look for 130kph at 7500'which is not what I had hoped, but acceptable.

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Re: Skylane Cruising Speeds

Try 2500 rpm and 25" MP, or 2300 & 23".  Might improve it some.  When you say 120 kph, is that kilometers per hour?  Sure hope not wink .  If its knots, then calling it "kph" is kinda redundant, like saying "nautical miles per hour per hour".  Course, I guess redundancy is a good thing when you're flying!  smile

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Re: Skylane Cruising Speeds

Touche' on the KPH.  I'll give a try.

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Re: Skylane Cruising Speeds

Jeff,
     That little bezel around your airspeed indicator will give you your "TRUE" airspeed.  I don't think your GPS is going to have that info...it's pretty good at giving you your ground speed.
My speeds are pretty much inline with what George gave above.
('68 skylane)

Michael

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Re: Skylane Cruising Speeds

A stock airspeed indicator is not capable of giving true airspeed.  It only gives the indicated airspeed relative to what it senses from the air entering the pitot tube.  It dosen't have the smarts to correct that reading for winds etc.  You will have to rely on a gps or some other method or instrument to give you ground speeds.
Depending on the year, the indicator may read in mph, knots or both.  More than likely the bezel that Michael is referring to is the mph conversion of knots.

I was just looking at the screen saver of my skylane panel on my computer.  At that point in time, my airspeed indicator was on `108 knots, 125 mph on the outer scale, and my gps was showing 153 mph (ground speed) on the yoke.  I was set up at 8,500 ft straight and level, about 2350 RPM, and just under 20 " MP (full throttle- cracked back).

After reading my first paragraph, I sound pretty matter of fact.  There is alot about airplanes and instrumentation that I don't know, so sorry in advance if I missed something.

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Re: Skylane Cruising Speeds

If I get ground speeds of 153MPH netted for head/tailwinds, I'll be happy with the performance.  Thanks Ted.

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Re: Skylane Cruising Speeds

Jeff,

You said that during your flight test at 2500 feet, at 2500 rpm and 23 MP. Indicated airspeed was 135 mph (120 kph). True was not observed, but the owner indicated cruise speed of 135mph at altitude. As you remember you need to calculate true airspeed.

My 172 cruise indicated airspeed is typically about 104 mph to 120 mph (in the summer), but when I calculate true or use the true airspeed indicator on the bezel around my airspeed indicator it typically is about 128 mph.  I fly at 75% cruise.  If it is called a bezel, it is an adjustible plastic ring that you set altitude (suppose to be pressure altitude) and temperature.  Then it is graduated to indicate true airspeed which you should be using for your flight test.  The indicated airspeed is not useful for these comparisons.

Some GPS's have a built in EB6 computer and will calculate true airspeed for you, or pull out that old rusting sliderule type flight and wind computer and calculate it.

2 cents

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Re: Skylane Cruising Speeds

Use your E6-B to figure TAS, if you do not have an airspeed indicator which has the adjustment.

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Re: Skylane Cruising Speeds

Bezel?  maybe not...I've only heard the thing referred to by that word.
It's the plastic ring around the airspeed indicator.  It has speed calibrations that match up with the calibrations on the airspeed indicator.  You then rotate the "thingy" so it indicates the altitude your're at.  The number on the "thingy", at which your airspeed needle is pointing to, is your "True" airspeed.
My 150 and 182 both have them.  I'm pretty sure these were both Cessna factory airspeed indicators...maybe not...

Michael

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Re: Skylane Cruising Speeds

If you are evaluating aircraft performance, GPS determined ground speed is irrelevant, and indicated airspeed is only a starting point.  Most Skylanes will cruise 7500' - 8500' at around 136 knots TAS.  The lower you go, the slower TAS due to drag.  As stated earlier, compute your true airspeed based on altitude, indicated airspeed, and temperature.  If you are just trying to get the highest ground speed, wait for a really strong front and go with it!

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