Shaking under continuous power

[Stevecat]

Take a look at the attached vid.  successful carrier launch.  Max RPM, gear up then flaps up.  Cowl flaps back down to minimum.  Reset trims to neutral.  I had inner cooler and oil coolers set to near closed. Then when I bring the RPM's back to about 2550 (manifold at 44) - continuous power - the plane really starts to shake.  Noticed this after the last update.  The shake only goes away if I take the RPM way down under 2000 or way up to like 5200.  What am I doing wrong?

Oh PS I thought all you "engine stopped" people were nuts, but I just had my first one.  Right on take off, temps fine, gas full.

I keep coming back to this thing, even though I know it's wack,  I just luv it so much, LOL

Edited 7 hours ago by Stevecat

[-Rudel-]

Stop going to 5200-RPM.  2700 should be Max.  Yes it's a bug as I've already told you in another thread.

The engine took damage from that and most likely caused the engine driven fuel pump to fail.

You're auxiliary fuel pump is off.  With a damaged pump, you had no fuel going to the engine which would have caused it too stop.

 

As for the shaking, it's most likely the cause of going to 5200-RPM and drastically dropping the engine speed to 2550.

[GTFreeFlyer]

46 minutes ago, Stevecat said:

Take a look at the attached vid.  successful carrier launch.  Max RPM, gear up then flaps up.  Cowl flaps back down to minimum.  Reset trims to neutral.  I had inner cooler and oil coolers set to near closed. Then when I bring the RPM's back to about 2550 (manifold at 44) - continuous power - the plane really starts to shake.  Noticed this after the last update.  The shake only goes away if I take the RPM way down under 2000 or way up to like 5200.  What am I doing wrong?

Oh PS I thought all you "engine stopped" people were nuts, but I just had my first one.  Right on take off, temps fine, gas full.

I keep coming back to this thing, even though I know it's wack,  I just luv it so much, LOL

 

Couple things here:  First, you are exploiting a bug that let's you go above 2700 RPM, which will be fixed soon.  Don't go past 2700.  Stick within the engine limits.  You'll find these on placards in the virtual cockpit, as well as in the manual and actual POH.  This bird requires you know the operating limits, so learn them and drill them into your head.

As for everything else, it just seems that maybe you're still learning about warbirds and engine management, which is great!  We've all been there and you've chosen the correct path   I'll give you my observations to help out:

After takeoff, set cowl, oil, and intercooler flaps as desired.  You don't have to close them just because you think you need to.  It all depends what is happening with your temperatures.  I didn't see your engine cut in this video, but I'm willing to bet it is because you closed your oil flaps, then oil temps went into red line and you cooked the engine.  Also, you don't need to do anything with the intercooler flaps unless your blower is on, which it's not for takoeff (I hope!).  Leave those closed so you don't have more drag than needed.

There's nothing in the checklist about setting your trims to neutral after takeoff.  Leave them alone, and slowly trim as needed for hands off flight at your desired flight condition.  I noticed as soon as you took out the right rudder trim, your slip indicator was showing you needed more right rudder, so you would have been better off leaving the rudder trim in, and slowly taking it out only as needed depending on what the ball was showing.

As for the shaking, you may have broken something in the engine.  You were at high manifold pressure and pulled your RPM back VERY quickly.  This would have overstressed the engine big time.  Manifold needs to be pulled back before pulling the RPM back.  Very quick movements with RPM and throttle put additional stresses on the engine due to high accelerations and decelerations.  Treat it gently, and she'll treat you nicely as well.  Whenever you move from one setting to another, give it a full 3 second count from one endpoint to the next.  

This bird takes some studying, and learning the basic principles.  All of the above can be found in the POH.  Read the actual POH linked below, and it all applies to the DCS module as well.  I've read thru this thing almost 5-6 times now.   It's invaluable.  Also read thru the manual included with the module, just so you know some additional DCS-specific things.

https://www.vmfa251.org/pdffiles/Corsair Manual.pdf

 

Just keep at it.  You're doing great

[Stevecat]

I appreciate the replies.  So instead of take off with the RPM lever set in the MAX position....just take off with the RPM no higher than 2700?  As for the fuel pump switch I thought after engine start up we shut it off (?)  and the pump is only for a cold start.

I'm probably breaking the sh*t out of the engine.  I will try these tips.  Thanks again!

 

[Scotch75]

After take-off, once you have cleaned up and the engine is performing, you can bring the mixture back to auto-lean, fuel selector to main (from reserve), fuel boost pump off. The fuel boost pump is used as a bit of insurance in demanding phases of flight, i.e., take-offs and landing (and yes, for start-up).
Cheers!


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[GTFreeFlyer]

51 minutes ago, Stevecat said:

I appreciate the replies.  So instead of take off with the RPM lever set in the MAX position....just take off with the RPM no higher than 2700?  As for the fuel pump switch I thought after engine start up we shut it off (?)  and the pump is only for a cold start.

I'm probably breaking the sh*t out of the engine.  I will try these tips.  Thanks again!

 

Again, engine settings for takeoff will be found in the POH.  Check out the link.  Scroll down to the takeoff section if you don't want to read the whole thing.

 

You can also install my kneeboards and follow them while in cockpit.  This will help get you going as well.

https://www.digitalcombatsimulator.com/en/files/3345803/

Edited 5 hours ago by GTFreeFlyer

[Stevecat]

thanks folks.  I think I figured out the problem and it has something to do with the RPM bug.  I think the whole time the "shake" was caused by being severely under powered.  When I put the RPM on the setting shown in the attached (5200 up thru 7000), everything smoothed out.  So I ran if for 45 minutes and am still running it now.  So that can't be Combat or WEP...must be around the mark for Continuous.  @Scotch75 thank you for the clarification on the fuel pump switch!  

It's fun again.

 

OMG Edited to note - I was reading the damn gauge wrong from the get go.  OMG.   Embarrassed!!

Edited 4 hours ago by Stevecat

[Scotch75]

The shaking is probably your engine detonating under high load. If you stick with the recommended settings and be vigilant with your temperature scan and use the respective cooling aids, the engine will purr nicely. I recently successfully passed carrier qualifications in the Corsair School campaign, with 5 take-offs straight into the circuit and 5 traps. The engine was working hard at low level and low airspeed. I was scanning the temps constantly and adjusting as required. The engine never missed a beat.
Cheers!


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