The reason for grn spoilers instead of dumping flaps is the speed of retraction of the flaps. They are slow as not to dump too much lift on a go-around or just normal clean-up. The GRN spoilers are instanious. The game is weight on the wheels.
On my PA22/20 control is the deal, weight on the wheels on the ground. Yes a pacer will lift a wing in a strong cross wind ! Wow exciting!

Rob wrote: A source more widely accepted by back country type (F.E. Potts) says this:

Ch19, Pg 138, Pp " Use of flaps - high wind conditions "
....Then coming over the threshold with full flaps, he reaches down and releases the flap lever so that flaps go to 0*. This is done just at flare, and when the timing is right the airplane drops on to the ground nicely in the three point attitude, then if the strip is smooth, hard, and long enough, the pilot brings his airplane up to the three point position and applies his brakes.

later in the same chapter, under the paragraph "tricycle gear (c206)"

So, I finally got out today and had a chance to try this out. Worked like a charm. A great little trick to have in your bag for when the situation requires its use.

I went out to practice shortfield spot landings and had a blast. Unfortunately my aviation buzz was dulled when the fuel guy came over and told me that fuel was now at $5.23 for us local guys. Less than a week ago it was $4.93.

On this whole flap dumping thing. I've always used it both ways, in both a Super Cub and in my Maule I have always "lifted" off by adding flaps during the takeoff run and "dumped" flaps on touchdown. By using this technique both ways you develop a good feel for it and I use it always. The "need" for using this technique may not be often, but by doing it always I feel more comfortable when I do need it. If all your operations include using this or any other technique it becomes natural and happens smoothly without additional distraction. In my opinion my brakes are hands down more effective without flaps.

Just my thoughts....

Jr.CubBuilder wrote:

Grassstrippilot wrote:Unfortunately my aviation buzz was dulled when the fuel guy came over and told me that fuel was now at $5.23 for us local guys. Less than a week ago it was $4.93.

I'll trade ya, it was $5.66 here and I haven't checked for a while so it's probably more like $6

Yeah, I know there are worse prices out there. I'm heading up to JC next week to play for a few days and I'm not looking forward to having to choose between expensive and more expensive when I have to sneak out for a fuel stop. Good thing I'm sharing the cost with a friend.

www.airnav.com and www.100ll.com are your best defense.

Yeah, been surfing both. What I find makes me ill. Even the trusty standby out of the way cheaper places are as much as my home field now.

Might not make a difference for next week anyway. Stanley has rain and snow in the forecast. I'm afraid we are going to get skunked. Might have to reschedule or head south.

Student Pilot wrote:

a64pilot wrote:Why do the big airliners have spoilers that deploy on touchdown?

Why don't big Airliners pull their flaps up after touching down?

Because they have spoilers to spoil lift (and add drag) and at the speeds that they land, the flaps add quite a bit of drag. Also, the flaps retract so slowly, there isn't a "lift dump" effect you might have in a spam can. They also have anti-skid.

I fly in the mountains quite a bit, landing on a strip with a gradient. As a result, I make tailwind landings with some gusts. Being able to quickly retract the flaps with the J-bar at touchdown with a gusty, decreasing tailwind is a big benefit (expecially with an added margin of speed for gusts). It keeps you on the ground and loads the tires for better braking effect.

Like someone said, "keep your eyes on the road when you do this".

next time your in town ask Geroge about dumping flaps going into Dog Fish Bay. If your up I'll see you next week.