American Airlines Virtual

That is snow in ATL. Actually, the sim is depicting it as snow, but it was frozen rain in reality. We got over an inch of the stuff overnight. It's nice and crusty outside now... good day for some more flying.

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The icing effects on this J41 are pretty darn snazzy...

and progressive too. Eventually the windshield gets completely covered, and the wipers are totally useless for it unless the window heating is on. In the first external shot you can see the icing effects that Wayne had posted earlier from the GFI. The ice builds up on the windshield, leading edges, nose and prop hub. Pretty cool!

I did fly a couple of patterns in the stuff and had no problems getting up to about 240 kts. I didn't experiment to see what would happen if I "forgot" to turn on the anti-ice.

Norberto Rivera wrote:I did fly a couple of patterns in the stuff and had no problems getting up to about 240 kts. I didn't experiment to see what would happen if I "forgot" to turn on the anti-ice.

As Harold found out during our GFI if you leave the prop anti-icing on your speed will be limited to about 190knt. IAS.

Theodore Martin wrote:

Norberto Rivera wrote:I did fly a couple of patterns in the stuff and had no problems getting up to about 240 kts. I didn't experiment to see what would happen if I "forgot" to turn on the anti-ice.

As Harold found out during our GFI if you leave the prop anti-icing on your speed will be limited to about 190knt. IAS.

Why is that???

Norberto Rivera wrote:

Theodore Martin wrote:

Norberto Rivera wrote:I did fly a couple of patterns in the stuff and had no problems getting up to about 240 kts. I didn't experiment to see what would happen if I "forgot" to turn on the anti-ice.

As Harold found out during our GFI if you leave the prop anti-icing on your speed will be limited to about 190knt. IAS.

Why is that???

Don't know why. Even on my freeware JS41 which only has one deice switch instead of individual controls, when I enable deice I can hear a noticable change in the engine sound. Seems to drop RPM but I didn't verify it via the gauges at the time.

Did a little reading in one of my books today about this. I'm not entirely sure this is the right answer as to why this happens, but it makes sense to me. The J-41 has pneumatic de-icing boots. These boots are operated by an engine-driven air pump that inflates the boots. The added load of operating the air pumps lowers the output of the engines to the props and you should see it as decreased RPM's and proportionately, airspeed. Any RW pilots out there that care to chime in we'd be more than happy to learn a bit more about this.

Norberto Rivera wrote:Did a little reading in one of my books today about this. I'm not entirely sure this is the right answer as to why this happens, but it makes sense to me. The J-41 has pneumatic de-icing boots. These boots are operated by an engine-driven air pump that inflates the boots. The added load of operating the air pumps lowers the output of the engines to the props and you should see it as decreased RPM's and proportionately, airspeed. Any RW pilots out there that care to chime in we'd be more than happy to learn a bit more about this.

That's as good an explanation as any....makes sense to me that you are applying additional loading on the engines (similar to turning on the air conditioner in a car).

Bert, I always told people you were good for something . Thanks for the info.

Theodore Martin wrote:

Norberto Rivera wrote:Did a little reading in one of my books today about this. I'm not entirely sure this is the right answer as to why this happens, but it makes sense to me. The J-41 has pneumatic de-icing boots. These boots are operated by an engine-driven air pump that inflates the boots. The added load of operating the air pumps lowers the output of the engines to the props and you should see it as decreased RPM's and proportionately, airspeed. Any RW pilots out there that care to chime in we'd be more than happy to learn a bit more about this.

That's as good an explanation as any....makes sense to me that you are applying additional loading on the engines (similar to turning on the air conditioner in a car).

Bert, I always told people you were good for something . Thanks for the info.

I would be careful giving Bert positive feedback as mentioned above. It tends to go straight to the head.