Yellow Arc RPM

[Shadrach]

201er,

I think you're reffering to a mapa eval of the 201. I do not know how well the Ram-Air works WRT the 201 induction system, I can tell you that in my F, it is good for 1.25-.25inches on the MP guage depending on temp/altitude.  Also, it certainly affects EGT. Next time you're in cruise, open it up and note the MP jump from open to close and let us know.

[flyboy0681]

what's the objective?"(reduced temps?, more speed?, greater range?, maximum efficiency? etc)

The one that's important to me is getting the engine to TBO without major repairs due to improper handling.

[Shadrach]

Fortunately for you and the rest of us, the angle (and parallel) valve 4 cylinder Lycomings are extremely reliable engines and going to TBO is highly likely in a well maintained engine. There certed TBO is at max power... Many people talk about the cam issues in these engines, but I think that is a lack of use/improper idle speed issue. The less known "Achilles heal" of this engine IMHO, is the crankcase. I had no idea now many of them had cracked until mine did (last year) @830SMOH and I started asking around. Of course there were other mx issues that led up to my crankcase issue which facilitated my decision to R&R the engine myself, but that's another thread... The good news was that after splitting the case, everything was in such good shape that we just IRAN'd with an OH'd case.

Note: Generator engines are more prone to cracks than Alternator engines...

[Shadrach]

"There = they're"...lack of editing is annoying...

[DaV8or]

"The only procedures that I follow the book on is setting mixture to rich during my GUMP check and pushing the blue knob forward. But then again, that's more of a habit ingrained in me by instructors over the past 30 years."

And it's a good habit. One less thing to think about or forget during a go around. The tiny amount of fuel wasted and lead fouling you get in the pattern is worth the margin of safety. You really don't want to do a full power climb with the mixture leaned way back. Seriously, not everything taught in the PPL course is BS.

[flyboy0681]

I think you are going to get some arguments here Dave.

[201er]

Let's see... even if you do a go around by the books (having done GUMPs beforehand), you'll still have to add full throttle, pitch forward, retrach gear, open cowl flaps, retrim, and take flaps up, while calling on the radio. At least you'll have full power the moment you put in full throttle. Two more knobs to push in is pretty substantial in an unexpected go around (say deer just ran out on the runway and you could just clear them by going around).

While we're on the subject, do you guys turn the boost pump on preemptively? I've been turning it on right after putting the gear down. By tieing the motion together with fear it helps me not forget.

[DaV8or]

For me, turning on the boost pump is part of the G in GUMPS. Yeah, I turn it on when entering the pattern and doing the GUMPS.

[fantom]

"Perhaps the word "consensus" was a bit harsh. Would "basic" standard procedure have sufficed?"

Define "basic" ;-)

Actually I think you'll find more "consensus" on what NOT to do.

Sorry we'll miss you Saturday morning. Enjoy HHI.

[Shadrach]

I'm not saying anyones SOP is BS... I do what I do based on my analysis of what's best. I enrichen in decent for a target EGT on the lean side, if I pull the throttle, I enrichen as needed to keep the ignited combustion event out of exhaust (which is seen as high EGTs at low power settings.

If I need to go around, I am in a situation where full power or close to it is available even if I don't push in the knob in rt away.  Full rich is roughly 250ROP at sea level. Anything from 15LOP to 300ROP will give you ~100%+ at sea level on a standard day and there will be plenty of time to adjust mixture if it turns out to be an abusive setting.  More importantly though, is that it puts me right on the money for max available power at high DA airports if I need to go around.

For those of you that go full rich in the pattern, what do you do if your landing at an airport with a 6000ft DA? How do you know where you are power wise? Do you think Full rich is an optimum setting for go around at an airport with  the following conditions:

6348ft Field elevation

29.85 altimmeter 

80df

dew point  27df

Note - This is Sante Fe this morning...DA is 9234ft Good luck figuring out how to get max power in a quickly decided go around.

So what's your SOP here?  Is it different then what you do at a 800 ft field???  My procedure is the same at all elevations, I'm familiar with it, it's second nature... and it sets me up for max power...

 

I leave my boost pump off... for both take off and landing, as I have a somewhat fragile dukes unit and would rather conserve it's life span for engine priming. I think that the risk of "catostrophic" mechanical fuel pump failure is minimal, the failure mode typically starts slowly and shows up as decreasing pressure/flow.

As for cowl flaps, they typically get opened when the gear comes down...for no reason other than it's a good reminder...

I am willing to change my SOP if you can articulate to me why a different way is better. 

Not so convincing comment would be"

"because my instructor told me to"

"because my Eisenhower....Reagan era POH tells me to"

"because my Mechanic says so"

etc.etc..etc...

 

 

[fantom]

Well stated, Ross!

[201er]

Good points about high altitude airports. I don't think I've landed any place above 2,000' yet but I'll definitely keep that in mind when I finally fly out west some time.

Oh and I made a stupid typo before "By tieing the motion together with fear it helps me not forget" was mean to say "with gear." Is there really no way to edit? I get a lot of error messages all over this site.

[flyboy0681]

I'll remember these instructions the next timeI break free of Florida's lowlands.

 

 

[Shadrach]

201er, I'm sure you've landed at greater than 2000ft DA.  I'm based at a lowly 702ft here in MD...current DA... 2784ft and it's only 84df... well over 3K is common this time of year...

[201er]

I should have clarified that I meant MSL. So yeah, DA may have been 3,000 tops. Still not high enough for full mixture to be much of a problem. The airport I'm based at is about 23' MSL, can't get much lower than that! Ha