Crosswind landing and propwash tests

[TUCKIE_JG52]

Well, here goes my first tests in CoD while trying to land under strong crosswind.

http://www.youtube.com/watch?v=xuMDBf6DUwE

I've placed an IA to wee what he does, in several tests he landa for the runway that has less crosswind component. Smart guy, uses correctly the crabbing technique, better than me, but his decrabs are tending to crash land the plane since de does not correct the last moment sink.

Landing after him, but with the runway that had more crosswind, I cheched some things:

-Anemometer had an instrument error (not bug, I think that's a real measurement error, caused by some lateral coomponent in advance), The fact is that a stall speed of an E-3 is about 125km/h... and IAS indication was 95 km/h only!

-Decrabbing a 109 under these conditions is extremely difficult, I understand IA's difficulties

-Once stopped on the ground, I was satisfied to chech that, as a good taildragger, the plane tends to face the wind.

-Maybe 30 m/s is a crosswind outside plane specifications, but it is almost impossible to taxi to a desired parking.

-Same for the fact that braks are inefective, and plane goes backwards when faced to wind.

-In the last ground test, wind acts as it should do the propwash, but (and I don't recorded this, soory got no diskspace left), if you stop the engine, the controls are still effective just by the action of the wind, son there's no propwash modelled!


-In general, that was a very challenging test, try it!


PS: Sorry, posted this in the general forum, It should be in FM Sub-Forum, reposted there, this post can be deleted.

[scorpac]

how to make a mission with wind?

[TUCKIE_JG52]

Originally Posted by scorpac

how to make a mission with wind?

Full mission builder, and then select conditions, its' the first menu that appears on the video. I'll tell you the excat name, but I have it in spanish...

Good testing Tuckie.

[Jarsalla]

hehee 30 m/s is 108 km/h or 67 mph. That wind speed is almost enough to be a level 1 hurricane !

[JG52Krupi]

Very nice, thanks for the test.

[=XIII=SAS]

Originally Posted by Jarsalla

hehee 30 m/s is 108 km/h or 67 mph. That wind speed is almost enough to be a level 1 hurricane !

+1 here.

Now, I have to say this having been a flight instructor in Canada. Most europeans won't use the slide technique (wing low) for landing as for north American, it's the first one that's being thaugt. In fact, the slide was apparently removed from the PP training syllabus in France. The low airspeed indicated is normal only as you flare. That is, the crab approach should not cause any different speed indication since the plane has nothing to do with it's trajectory over ground. When you flare and de-crab, you go sideways from what the air around the plane travels, exposing the pitot tube to an angle thus creating the difference in airspeed. That's just another (there are many more) reason why we have two pitot tubes in airliners nowadays.

That decrease in IAS also tells you that the downwind wing is also partly "shadowed" or airflow-obscured by the fuselage. That momentarily affect the aerodynamic wingload and most likely loose so lift. That why, without passengers, you can start decrabbing earlier and set your attitude 1/4 mile before touchdown if you want.

Now, with your 108 km/h wind setting, I would not even think of going up for a spin, let alone trying a wing low landing!!! I'm sure they were all inside, sipping tea with scones and crumpets...

Cheers.

[droz]

yeah...i hate to say it, bu your wind speed is WAY too high. lol. That's like flying in a tropical storm. You need to lower it to like 5m/s