Landing speeds

[mocaman]

Hey guys, I was wondering if you have lets say a 20 knot headwind on landing and its a little bumpy...how much should you add to your final approach speed? Lets use a piper warrior in this case (65 on final). Thanks!

 

[banned username 2]

In the Falcon 900EX we add 1/2 the steady state wind plus all of the gust factor for a maximum addition of 20 KIAS to Vref

Example... if winds are 15 gusting 25 we add 17 knots (1/2 of 15 plus all of the 10 knot gust factor (i.e. 15 gusting 25 = 10 kt gust factor))

Hope this helps...

 

[bobbysamd]

Headwind component

I've heard two rules: (1) add half the gust factor, if any, or (2) add all of the gust factor. I believe that (1) is the FAA's recommendation. In your case, you might fly final at 80 kts max and with two notches of flaps max. I would not do a full-flapper. The headwind will compensate for any additional landing distance and after-landing roll.

Try looking it up in the Performance section of your POH.

Hope that helps.

 

[Northern Lights]

Also, remember that if you come in a little fast with a headwind, your ground speed will still be slower than if you had no wind, so as Bobby said it will be easy to slow down.

If you cross the threshold fast, though watch out in the flare. You will probably want to flatten out the flare a bit so as not to balloon.

 

[jetdriven]

in Kansas if you add the whole gust factor to make Vref then it would be above the VLE of most complex airplanes!

 

[tarp]

First off, if it's a laminar flow wing(i.e., models are -141, -161 and -181), the magic normal speed is 67 and the short field speed is 64. Your number 65 is good for Hershey bar wings or as a good "middlin" speed.

The dash-one's laminar flow wing is a real floater if you get too much speed, soooo......you really want to be as close to the speeds above as you can when the wheels touch the tarmac.

For a straight ahead steady headwind, correct zero - nothing. Like the one poster said, enjoy the slower "ground" speed and slow down the rate of flair.

You said "bumpy" but didn't qualify that as "gusty". If there are gusts, add 1/2 the gust factor not to exceed 10 knots or 75 knots total. The only thing you are guarding against is that the gust will desert you while on short final. For the cherokee series the same could be said for direct x-winds, add one-half the x-wind not to exceed 10 knots (kind of impossible given a 17 knot max x-wind). You "carry" the extra speed in a crosswind to make up for the slip you are going to have to employ to make a good landing.

With the "bumpy" and your 65 knots, there's a good chance that your stall warning horn will go off - the "horn" is set in a position that will sound when the wing gets close to 55 knots and the actual stall with full flaps will occur around 49 knots (without ground effect) and 45 kts (with ground effect). The horn sounds far in excess of the actual stall and I find myself warning many a passenger that this horn will go off if its bumpy.

At greater than 75 knots, you basically are throwing the flight manual away. The ground effect with that laminar flow wing will cause you to float a landing into the next county.

Many, many hours in the Cherokee series.