The A2A Simulations Community

Having flown the Tomahawk for more than 90 hours, I can notice a loss of power due to the worn engine.

Here are some screens showing the difference between a new engine and the used one.

On a ground run with 26" MP the old engine produces less around 2050 rpm


same conditions with the new engine show 2200 rpm


It needs around 30" MP for the old engine to reach 2200 rpm


The new engine produces 2400 rpm with 30" MP


Now the maintenance hangar in comparison




I always tried to avoid high engine temperatures and kept to the operations manual. If someone is interested, I could post the maintenance history starting from the 35th hour.

What's your experience with worn airframe and engines?

Happy landings
Jens

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"Give me a ping, Vasili. One ping only, please."

I don't think the loss of power here is due to the cylinders. It could be due to a combination of a lot of items, that may be very close to being reported as wear. Let me do some experiments and get back to you on what may be causing the loss of power. Scott.

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A2A Simulations Inc.

No criticism from my side. I like the way it's implemented and simulated. Especially having clogged filters which leads to rough engine running and sputters. Great sound while backfiring and so on.

I only wanted to hear, what others expierienced with worn engines.
The cylinders are still good, so I think, it's the overall wear.
Do you need my .dat-File to analyse things?

What about tbo of the Allison engine? When does it need a complete overhaul?

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"Give me a ping, Vasili. One ping only, please."

Me too!!

The Allison..generally you should overhaul it once actual bits of metal start to stream out of the exhaust stacks...other than that it is one of the toughest, most resiliant engines ever built! The RAAF guys flew home with little to no oil on many documented occassions !

I think what Scott is saying is that she shouldn't wear down quite as fast as 90hours if you look after her.

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...Some say he never blinks, and that he roams around the woods at night foraging for Merlin parts...

I really look after her. So cylinders are still good which you can see in compression test. I only had to replace filters, radiator, brakes and so on. But this is normal I think.
So maybe there is something inside, what the maintenance hangar can't show... *play X-Files theme*

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"Give me a ping, Vasili. One ping only, please."

Sounds like there may be. I'm sure Scott will hunt it down if it is there.

There are many factors though with high performance engines and sometimes they actually like a bit of "tough love".

Darryl

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...Some say he never blinks, and that he roams around the woods at night foraging for Merlin parts...

We did a little housekeeping for Core Accu-Sim v.1.3, which is coming with the Mustang. Your cylinders are not the cause of any power loss. Even very worn cylinders will still make excellent power at higher rpm. Wait for the next update, as we've tuned things a bit too.

Scott.

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A2A Simulations Inc.

Thanks a lot. Yesterday I had some difficulties to takeoff from a short runway with full fuel load and droptank.

Were you able to build this core update in a way, that engine and airframe hours for Spit and P-40 will not be deleted? I was a little upset with core v1.2 losing my Spitfire hours

Jens

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"Give me a ping, Vasili. One ping only, please."

could the power loss be coming from the generator? If the generator is warn and the rotor is hard to turn it could be putting excess loads on the engine.

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It's more likely coming from a worn crank, filters, magnetos, etc. We did re-tune these for the Core v.1.3 so they will show yellow a little earlier.

Scott.

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A2A Simulations Inc.

Hi.

My wish again:

Is it possible so save wear and condition for each paint of one aircraft type independently?

While i am on my online world tour with one and the same P40B with presently 115 hours total on engine and airframe, it is unpossible for me to fly another P40 B making aerobatics or short trips without affecting my world tour- P40B.

Could that be implemented into an core update?

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FSX SP2 DX9.Addons:FSG2010,REX OD, AS2012, PMDG, DA Do27, Dodosim, A2A accusim all, Katana4X,Coolsky DC9 Classic, Swiss Pro,ORBX all, Fly Tampa, DRZEWIECKI DESIGN, FS Dreamteam, FranceVFR Haute Normandie 3D...

You only have to save the .dat-file stored in your users directory.

C:\Users\USERNAME\Documents\A2A\FSX\P40

P40BAVGLog.dat
P40BLog.dat
P40CLog.dat
TomahawkIIBLog.dat

Make a backup copy after each flight for your desired aircraft paint. Restore the file before starting a new flight everytime you want to use a different aircraft paint.

Now I reached more than 100h

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"Give me a ping, Vasili. One ping only, please."

Hi Jens,

thanks for solution.

I know that, but i want to sit in and fly and not think about to manage files the correct way. This is not a fine solution for me.
I would be interested in an automatic solution, that is why i am asking.

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FSX SP2 DX9.Addons:FSG2010,REX OD, AS2012, PMDG, DA Do27, Dodosim, A2A accusim all, Katana4X,Coolsky DC9 Classic, Swiss Pro,ORBX all, Fly Tampa, DRZEWIECKI DESIGN, FS Dreamteam, FranceVFR Haute Normandie 3D...

I have to say your cylinder compressions are eerily uniform. I know when I reached the 80ish our mark while all green they were all over, some high some low. And thats from mostly x-country flying.

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Heck by the time I hit about 20 hours I have some dead cylinders usually. I thought it was normal, but guess I am the bad pilot among us. I try my darndest to baby the thing too. Ah well.

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S Jordan
Milviz Staff Member
AM; United States Navy
FSX Hours: 2000 and counting