Density Altitude

[Hank]

15 minutes ago, RobertGary1 said:

I agree with that. I've never felt that simulation technique was very helpful. Felt it was more how a flatlander thought it would be.

-Robert

He wasn't a real flatlander. He was DPE in CRW and Commander of WV Air National Guard. Not flat, but not as high as W. CO.

[Ibra]

32 minutes ago, midlifeflyer said:

It's only a partial simulation. It doesn't simulate the loss of lift and prop efficiency. But it's better than nothing

I would have suggested to bring it to 23 on MP, 24 on prop and 2/3 of flap plus some soft muddy 6inch grass for a more realistic experience, if you can get away with that you have the right technique but cleaning the inner doors is a nightmare...

Edited May 18, 2021 by Ibra

[Skates97]

In searching online for an Excel version of the KOCH chart I came across this website. You can put the information in or just put in the Airport Identifier. I don't know how it works on an iPhone but on an Android you can go to it in Chrome and pin it to one of your home screens.

https://www.takeofflanding.com/

Example of what you see on the website:

 

[dogbocks]

15 hours ago, carusoam said:

db,

There are a few discussions around here for FF and the IO550...

Mostly stemming from the 310hp version...  where 27.2gph (?) isn’t quite enough to comfortably cool the CHTs...

The Missile with 300hp has the same challenge....

Expect the O<3s may benefit from additional FF...

The maintenance books probably give a range... to select from...   

Often, the middle of the range gets targeted...

You may want to specifically choose the max limit of the documented range...

PP thoughts only not a mechanic...

Best regards,

-a-

Ah good tip, I think you might be on to something. 

I was there when we calibrated the FF. I don't remember the numbers but I remember it being right in the middle of the allowable range. My A&P and I figured that was where we should leave it and we did, but I think you are right, to keep things a bit cooler on T/O it would be better have the fuel flow on the higher end of the allowable range. I will have to try that. 

[EricJ]

43 minutes ago, Skates97 said:

In searching online for an Excel version of the KOCH chart I came across this website. You can put the information in or just put in the Airport Identifier. I don't know how it works on an iPhone but on an Android you can go to it in Chrome and pin it to one of your home screens.

https://www.takeofflanding.com/

Example of what you see on the website:

 

That's pretty cool!   Thanks for posting.

 

[Niko182]

16 hours ago, dogbocks said:

Yep still 280 but with the 3 blade top prop already. planning on 310 at some point, just need to dig around in the couch cushions for 7 AMU

 

FF- of the top of my head 23-something. It has was checked/calibrated last summer when trying to track down a hot CHT issue, so it is spot on according to the spec.

 

Departing Mammoth, Truckee and Bridgeport (3800 foot runway at 6.5k feet) on hot days always get off the ground with lots of runway left, and *could* climb at 1000fpm, I would just melt the engine so I have to keep it to 400ish fpm at least until in cooler air. Not sure if that is a limitation for other Mooneys M20R or otherwise. Would be interesting to know. 

Gee bees baffles makes a world of a difference. 23gph seems to be a factor in your issue aswell. A good representation for the big bore TCM's seems to be about 9 to 9.5% of the HP should be your fuel flow. 280 equats to about 25 to 26gph. 310hp equats to about 28 to 29gph.

 

As far as High density airports in the ovation at least, the ovation has a pretty low gross weight for its power compared to other aircraft similar to its catagory. I think that allows it to do pretty well up high without a turbo.

[Hank]

3 hours ago, Ibra said:

I would have suggested to bring it to 23 on MP, 24 on prop and 2/3 of flap plus some soft muddy 6inch grass for a more realistic experience, if you can get away with that you have the right technique but cleaning the inner doors is a nightmare...

Been there, done that, no thanks again! Took full power at 40' msl to taxi after landing. Before takeoff, I walked the field and plotted my run to hit only the shallowest water. Left a few days later, solo, no bags and half fuel--rather long takeoff run. Wife met me with luggage a 45-minute drive away with several thousand feet of concrete and a fancy ramp and FBO.

[midlifeflyer]

23 hours ago, Hank said:

He wasn't a real flatlander. He was DPE in CRW and Commander of WV Air National Guard. Not flat, but not as high as W. CO.

The simulation is not "bad" but the instructor should be discussing its limitations with the trainee.

[bradp]

Cue Harry

 

 

[carusoam]

FAA... 1966... in living color... 

Showing how DA is equally forgotten back then as it is today.....

Interesting PS message...

Best regards,

-a-