Tachometer

[alexcolka]

Hello,

This little plane is amazing! I love the texturing, great handling. I noticed that when I apply full power for takeoff the tachometer shows that the RPM easily exceeds the red line by far. Is this normal for this plane?

Thanks,

Alex

[P-38]

This is normal for the real aircraft, or at least the 152 I fly.

[Frankenscence]

Can you run the engine at the max RPM, or do you need to keep it below the red-line?

[boleyd]

The climb rate at 3000rpm along with the 120knot speed seem quite high. Should the tach/engine really go this high?

[Airbus]

I checked the RPM gauges in X-Plane and the values are correct. The prop is fixed as you fly faster the airflow will increase the speed of the prop and engine. No you don't want to run the engine at max rpm for extended periods of time. Many aircraft engine manufactures have a maximum rpm time limit.

[woweezowee]

hm, I have to pull back the throttle nearly 50% in order not to "hit the red mark", wich will give me also a reasonable cruise speed in the 152. It is good to know if that's right or not. At least it feels exaggerated, but maybe I'm spoiled because I also own J. Chandlers 150, where the effect is not that heavy.

[woweezowee]

I trust P-38 and Airbus, but of course BrettS. has an opinion, too. FYI: http://forums.x-plane.org/index.php?showtopic=46803&pid=518461&st=0&#entry518461

[Airbus]

I sorted the problem out.  Its much better now!

[woweezowee]

Great news! Even more looking forward to the update (hint: I have some spare time at the weekend and I want to fly around Mount Etna in the C152)

[Airbus]

;D Sweet its been a few years since I've been up in a real 152. I'm eager to hear what you think! Have fun!

[woweezowee]

nope I am gonna fly your (updated?) C152 around there . And maybe, if I go to holiday there, a real plane (but as a passenger)

[boleyd]

Just to be sure - I just tried the plane again and left the throttle at max. It climbed at 1100ft per minute at a speed of 80 knots for several minutes. Tach reads 2700 and the digital data output (on screen) agrees. I was mis-reading the tach numbers before. However, the powerful engine giving the climb rate above does seem odd. I think I saw where you said that you found something. Awaiting that fix. Thanks

[P-38]

Double post, sorry.

[P-38]

Just to be sure - I just tried the plane again and left the throttle at max. It climbed at 1100ft per minute at a speed of 80 knots for several minutes. Tach reads 2700 and the digital data output (on screen) agrees. I was mis-reading the tach numbers before. However, the powerful engine giving the climb rate above does seem odd. I think I saw where you said that you found something. Awaiting that fix. Thanks

In a climb it is strange to get anything over redline, but I try to climb out as close to 67 knots as I can get in the 152. If you are flying straight and level you should be able to exceed redline up to about 2800rpm. I don't know about a dive, I have never gone into one with a high power setting. As for a climb rate of 1100ft a minute, this sounds about right, in a full power climb with low weight you can get around 1200ft to 1500ft a minute. Now if you are heavy it is normally around 500ft to 900ft a minute at lower altitudes.

[boleyd]

Uploaded with ImageShack.us

Loaded with 350lbs of human cargo. Weather clear and calm. Set RPM as shown on the panel gauge at 2200rpm.

Note the read out at top left for RPM??