IAR-80 Engine Question

[TRRA15]

I notice that when throttling back to idle for approach/flare/landing, that the engine RPMs are still high enough to generate unwanted thrust, thus greatly extending the landing roll-out. In fact I've had to shut the engine down to avoid going off the end of the runway and colliding with things.

 

I am presently not using complex engine management, and in other aircraft this is not an issue. On this particular A/C is CEM a must so that I need to directly manipulate propeller pitch?

 

Thanks.

[LukeFF]

Yes, propeller pitch is 100% manual. 

[Jaegermeister]

6 hours ago, TRRA15 said:

I notice that when throttling back to idle for approach/flare/landing, that the engine RPMs are still high enough to generate unwanted thrust, thus greatly extending the landing roll-out. In fact I've had to shut the engine down to avoid going off the end of the runway and colliding with things.

 

I am presently not using complex engine management, and in other aircraft this is not an issue. On this particular A/C is CEM a must so that I need to directly manipulate propeller pitch?

 

Thanks.

 

Keep the tail down and use the skid as a brake

[AEthelraedUnraed]

13 hours ago, LukeFF said:

Yes, propeller pitch is 100% manual. 

Actually, it isn't He's referring to the "Engine auto control" setting, which if checked controls the prop pitch for you (i.e. a difficulty setting rather than an aircraft property).

 

15 hours ago, TRRA15 said:

I notice that when throttling back to idle for approach/flare/landing, that the engine RPMs are still high enough to generate unwanted thrust, thus greatly extending the landing roll-out. In fact I've had to shut the engine down to avoid going off the end of the runway and colliding with things.

 

I am presently not using complex engine management, and in other aircraft this is not an issue. On this particular A/C is CEM a must so that I need to directly manipulate propeller pitch?

 

Thanks.

I don't think propeller pitch is the issue. Generally speaking, you should keep propeller pitch low (i.e. RPM high) on approach, so that if necessary, you can quickly apply power for a go-around. Besides, in low-power settings such as used on landing, a low propeller pitch (=high RPM) actually helps to slow down, since a high pitch reduces the propeller drag (very similar to feathering). I did a quick test with the IAR, flying on autolevel at 300kph, setting power to idle and measuring the time it takes to slow down to 200kph. With my propeller at 12:00 (i.e. low pitch = high RPM), it took 28 seconds. With my propeller at 8:30 (high pitch, low RPM), it took a whopping 38 seconds. So if you want to slow down quickly, your propeller should be at low pitch/high RPM.

 

I also did a test with the "Engine auto control" setting on, and the game correctly sets your prop pitch to low when landing. So your propeller should be configured for the shortest roll-out possible.

 

I lastly did a quick test (manual engine mode) comparing the landing distances of the IAR-80 and Yak-9; they were very similar. I also didn't notice any great differences with the "Engine auto control" landing just before.

 

All of the above leads me to believe that there's something else going wrong with your landing. One thing I can think off are the brakes; the IAR uses Soviet/British style brakes on the control column, rather than German/USA style foot brakes. These have different key assignments, so if your keys are configured for German/American aircraft, they might not work.

[TRRA15]

Thank you for your input(s). I hadn't mentioned it in my original post, but my braking action works well. I'll do a more thorough runway approach circuit to get my speed and altitude lower in a more slow and gradual manner with this aircraft, which I generally do anyway, but this aircraft does seen to have taken the number one position from the Fw-190 in the "retains energy well only when you're trying to land" category. 😀

[-TBC-AeroAce]

3 hours ago, TRRA15 said:

 the Fw-190 in the "retains energy well only when you're trying to land" category. 😀

 

I think it is your landing technique because for me, the 190s are a planes that bleed airspeed when landing, so much so you can kill yourself by taking too much power off and not having enough time for it to speed up again.

 

I would guess that you are too high and or fast or your approaches.