RCU Forums - Landing with the wind

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RE: Landing with the wind

Quote:

ORIGINAL: Minnreefer

A side issue but I found it interesting, I am sure that I don't have it completely correct, but close. In the end of WW2 when B29's were flying to Japan, they were having all kinds of problems at high altitudes, apparently they did not fully understand the jet stream and how much it effected their ground speed, the plane indictated that they were flying 200 some knots but the bombadier was only indictating slow ground speed, it messed everything up.

Not surprising as they didn't have the meteorology and satellite data we have these days. And the Japanese weren't helping much by providing data either.:D

RE: Landing with the wind

Quote:

ORIGINAL: r2champion

Yes I realize my mistake. Sometimes it is easier to just know something rather than trying to explain it! ;) Thanks

Sometimes the more you try to explain something, the more confusing it gets. To me the hypothetical hovering examples make it easier to grasp what's actually happening.

And of course I NEVER make mistakes. ;)

bob

RE: Landing with the wind

Quote:

ORIGINAL: Minnreefer

A side issue but I found it interesting, I am sure that I don't have it completly correct, but close. In the end of WW2 when B29's were flying to Japan, they were having all kinds of problems at high altitudes, apperantly they did not fully understand the jet stream and how much it effected their ground speed, the plane indictated that they were flying 200 some knots but the bombadier was only indictating slow ground speed, it messed everything up.

I wonder how many planes were lost until they figured out what the jetstream actually was.

Bob

RE: Landing with the wind

Quote:

ORIGINAL: flyX

no..that's what I'm trying to say..ground speed dosn't have anything to do with lift.

the only time the ground effects the model is how hard you'll smack it into the ground :D

First correct things you've said, with the provision that your ground speed while on the takeoff roll gets your airspeed to the point you can fly.

Quote:

thinking if it fly pass you going with the wind at @20 mile when you model stall speed is 18 mph, when
the wind is blowning at 5mph.

If I understand the fractured grammar, your plane is going three mph slower than the stall speed, so it will be on its way down (with the wind=downwind, 20mph is ground speed, since it passes you downwind at 20 in a 5mph tailwind, = 15mph, which is 3mph slower than stall)

Quote:

I'm telling you this...becuase I've done it on dead sticks :)
going with the wind. I've watch my model drop out of the sky at 4-5' .

As the plane drops in the stall, it is picking up speed from the gravitational constant, so at worst it is probably moving at its stall speed instead of below it, but it is still descending. If you don't pull up, you crash. If you do pull up (or pull back on the elevator)with enough altitude remaining, the nose will rise, changing the angle of attack, which modifies your stall speed, the plane flares, so it is flying again until the airspeed from the dive bleeds off. Hopefully you're on the ground by then.

Not trying to make a deal of your writing, but it's difficult to understand you without correct punctuation and tense.

Basics are, your plane muct be travelling across the ground at a speed GREATER than the speed of the wind + the stall speed of the plane if it is travelling DOWNWIND.

To respond to Mitchell on the B-29's, it became a real problem flying east to west (towards Japan) in the Jet Stream because it effectively reduced the aircraft's range flying into a headwind that strong. More than a few ran out of fuel before making it back to base after the mission.