2000 rpm, 25" MP, 155 MPH 7.5 GPH, Anything wrong with this picture?

[Shadrach]

I'm sorry but these two statements seem really ignorant to me. I don't have GAMI injectors on my IO360-A3B6 engine and I get a better gami spread on lean tests than what the GAMI injectors are advertised to provide. They promise to get it below 0.5. Mine is 0.0, or 0.1 at most.

Now as for the first comment, that seems really out of place on our machines. I will grant that is what my instructor taught me for a run-down 152 with no equipment, however, our planes are far beyond just guess work. Leaving the mixture full rich (someone correct me if I'm wrong) effectively puts you at about 250-350ROP. Not only are you wasting a ton of gas for absolutely no good reason, it's also putting a lot of carbon into the engine AND reducing your effective power. Even near sea level at 75% power or below (and not even going LOP) my mixture knob comes back a good ways.

This generic approach leads you to neglect case by case information. For example, 100ROP is not necessarily a good place to be. Under certain conditions your CHTs may exceed 400F at 100ROP which isn't great.

I think we should seek to greater educated ourselves, learn to understand our engines and airplanes, use all available information, and put this to use rather than to rely on generic rules of thumb that are supposed to keep any beginner or dummy out of trouble. Just my four half pennies.

FWIW...My engine is 225-250 ROP on the richest cylinder at WOT max RPM. The rest will peak within ~15-20df of that one's peak.

[BigTex]

I'm still learning the best way to operate my 64 C. Reading all the posts on this subject line seems a diverse number of opinions. What I do is climb WOT full rich unless very hot day at 120MPH for around 800 to 900fpm leaning slowly as I climb. At cruise and all cleaned up I run WOT adjust mix for what seems smoothest running and rpm around 2500 gives me my best IAS with MP between 21" to 24" depending on DA. For me the hardest thing is I only have the standard gauges and I doubt they are very accurate but I keep my temps in the green and as far below what the gauge shows to be 400cht as possible. So far it seems good but there is not much you can do with crappy gauges I sure do like all the comments on the subject makes me want to learn as much as I can.

Banal, the first thing I did when I purchased my plane was to have a JPI 700 installed. I personally feel that it's the single most important in my plane. I would not walk but run to have an engine monitor installed. They are not that expensive so there's very little excuses out there for not having one. You only have four cylinders so you need to make sure they all keep running.

[EDNR-Cruiser]

That is weird...ringing for three days...We have the same engine. The noise levels in my cockpit are not over 90dba without headsets. Not as loud as a lawn mower...Shouldn't have ears ringing for that length of time...really at all. HHHHmmmmmm, curious.

 

Well, that may depend how good your hearing still is... - I cannot fly without protection like ear plugs or headphones in any aircraft without my ears ringing for some time but I also wear ear plugs on my motorbikes, in concerts and so on and the doctors are always surprised that someone at my age is still hearing better than most 18 year olds these days....

[bonal]

Actually I have been looking into different monitor systems including JPI and when it goes in for annual in a couple of months I intend to install one. Lake Aero does my annuals and they allow owner assist so it will be a good time to do the installation with there help. Should help to keep costs down.

BONAL

[phecksel]

A Mooney is a rather quiet aircraft, not really any louder than a 172 from listening to them come and go so much all day.  Here's another thing, altitude is a very effective noise suppressant as well. Instead of climbing at 2500 RPM, climb 200-300 FPM faster at rated power and you will be higher over the neighbors when you pass over.

Problem is, at 2700 RPM, prop tips create a LOT of noise.  My house is between two airports and don't see much airport traffic, and it's usually at a decent altitude before crossing over head.  There is a HUGE difference between a plane that has pulled back the RPM's slightly than one that hasn't.

[jetdriven]

And all of those were Mooney airplanes, or airplanes with 74" diameter props?   Please clarify...

[garytex]

Scott I'm down to the last little bit of my hearing (80-100,000 lifetime rounds thru various firearms) and I think that that is maybe why my ears are so sensitive and maybe I have a particularly loud airplane. It's loud in cruise, louder than any other airplane I've flown in except the 450 hp Stearman, and really loud at take off. The stinker is loud.

[jetdriven]

I will say its the loudest airplane I have ever flown as far as cockpit noise, but the noise signature of one passing overhead is no more than a 172, and certainly less than a Bonanza and a huge amount less than a twin piston.

[scottfromiowa]

O.K. I have completed a lot of noise monitoring (in Mfg environments), but I have never actually measured climb or cruise decibel level in my Mooney...But I have taken off my headset and my estimation was <90dba. I put a sound meter on my i-phone. I will check it out. I used it in my new company car as I was curious if at 1/2 volume on my stereo if dba was 85. 85 is 8-hour limit by OSHA guidelines. If at 85, but below 90dba you need to test employees and provide ear protection. Mandatory if 90 or over for an 8-hour day. You can be in environments above 90 without hearing protection, but there is a chart on "how long at how loud". I to have had ringing ears after concerts before I got older and wiser and wear plugs. With windows down in my car the wind noise was over 90dba...A good excuse to run the AC in the summer (talking highway speed). A good rule of thumb is that if you can hold a conversation with your co-pilot in normal conversation voice without a headset (and you can hear them) you are <85dba. That said I ALWAYS fly with my Bose...usually jamming to tunes

[scottfromiowa]

Just searched online and an FAA document for noise in certified airplanes had the M20F listed. 84(and some change) dba...Under OSHA 8-hour action level. You can fly sans headset for 8-hours and not have adverse hearing loss. Definitely should not have ringing ears following flight. We are not talking gunshots, jet engine or chainsaws in a Mooney cockpit...or my son playing his Fender Strat...

[garytex]

My planes louder than your plane.

It's a loud son of a bitch.

I flew it for a while with passive David Clark's that I have had for 30 years,and worn in multiple airplanes with never ever ringing ears. My ears, which ring a little bit all the time, would ring like mad and even chirp a little bit after a flight with the David Clark passives. I installed the Headsets Inc. ANR ear cup set in the David Clark's they worked really well. Then found some use Zulus which are more comfy. But when the battery goes dead on either, they have very little passive dampening, and you're hosed.

But now I'm not. I go to 2000 RPM Lena peak maybe 23-24 inches manifold pressure and cruise along with a little bit more vibration but very quietly. Then it's easier on the dogs ears.

[jetdriven]

I think those noise levels are flyover numbers at some specified altitude. I do concur that the cockpit in a Mooney is really loud, but the sound emitted from flying over is rather low.

 

Looks like the Cessna 172 is 74 dBa and the Mooney M20J is the same 74 dBa.

[scottfromiowa]

My planes louder than your plane.

It's a loud son of a bitch.

I flew it for a while with passive David Clark's that I have had for 30 years,and worn in multiple airplanes with never ever ringing ears. My ears, which ring a little bit all the time, would ring like mad and even chirp a little bit after a flight with the David Clark passives. I installed the Headsets Inc. ANR ear cup set in the David Clark's they worked really well. Then found some use Zulus which are more comfy. But when the battery goes dead on either, they have very little passive dampening, and you're hosed.

But now I'm not. I go to 2000 RPM Lena peak maybe 23-24 inches manifold pressure and cruise along with a little bit more vibration but very quietly. Then it's easier on the dogs ears.

Why? Why is "your" plane so loud?(In comparison to mine/others?) Prop, insulation, glass, engine harmonics...I don't know. I do know shooting a firearm sans ear protection and lifelong extended exposure to high noise levels will result in insidious hearing loss and tenitis. Sorry, it sounds like you are one of the many that are in that category. Protect what you have got.

[kmyfm20s]

My planes louder than your plane.

It's a loud son of a bitch.

I flew it for a while with passive David Clark's that I have had for 30 years,and worn in multiple airplanes with never ever ringing ears. My ears, which ring a little bit all the time, would ring like mad and even chirp a little bit after a flight with the David Clark passives. I installed the Headsets Inc. ANR ear cup set in the David Clark's they worked really well. Then found some use Zulus which are more comfy. But when the battery goes dead on either, they have very little passive dampening, and you're hosed.

But now I'm not. I go to 2000 RPM Lena peak maybe 23-24 inches manifold pressure and cruise along with a little bit more vibration but very quietly. Then it's easier on the dogs ears.

You can put in ear plugs under your headset and turn up the headset volume for a quieter ride and still hear the radios just fine.

[garytex]

Kmyfm20j:

I shoot with both muffs and plugs, never thought of doing that in the plane, good Idea.  I think I'll start carrying plugs for those times when the batteries all run out in the ANRs.

[aviatoreb]

Kmyfm20j:

I shoot with both muffs and plugs, never thought of doing that in the plane, good Idea.  I think I'll start carrying plugs for those times when the batteries all run out in the ANRs.

 

Why not carry batteries for those times the batteries run out?

[carusoam]

Statistically thinking...

That's pretty funny Erik.

I was waiting for Gary to serve up a drawing of a guy with a belt and suspenders...

Best regards,

-a-

[Hank]

Why not carry batteries for those times the batteries run out?

 

Just one more thing to love about my Halo's, besides the fit, comfort, sound quality and I can wear any hat . . . No worry about batteries! 

[aviatoreb]

Just one more thing to love about my Halo's, besides the fit, comfort, sound quality and I can wear any hat . . . No worry about batteries! 

 

I fell out of love with my halo.   Over time I just came to the point that I prefer my Bose X.  Hard to say why.

 

Although in the winter - sticking coooooold hard 0F airplugs in your ears.

 

I carry a 20-pack of double-a's.  For my several aa eating devices.  Its no big deal.

[Ned Gravel]

I fell out of love with my halo.   Over time I just came to the point that I prefer my Bose X.  Hard to say why.

 

Although in the winter - sticking coooooold hard 0F airplugs in your ears.

 

I carry a 20-pack of double-a's.  For my several aa eating devices.  Its no big deal.

 

Erik:

 

I feel your pain.  I just never leave my Halo's in the aircraft.  They travel in my Brightline along with the other bits an pieces that are carried to and from the Mooney steed before and after flight.