Backcountry Pilot • Newbie Backcountry - Bouncing on rough ground

Newbie Backcountry - Bouncing on rough ground

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Re: Newbie Backcountry - Bouncing on rough ground

Mike B,

What you are describing is what the Army calls, "The apparent brisk walk rate of closure approach." While used to teach the normal helicopter approach, it works with airplanes too. Many pilots use it but don't call it apparent rate. Have you noticed that once off the airspeed indicator and looking at the landing zone, you appear to be approaching it at what looks like a brisk walk? You are actually slowing from short final to touchdown on the numbers, but it appears to be the same brisk walk all the way down. You are right that we use stick position and pressure, relative wind noise, decreasing buoyancy, etc. to feel it down. We need you guys that use this slow approach to explain it for us. I have been unable to convince these guys that I am not senile.

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Re: Newbie Backcountry - Bouncing on rough ground

Yeah, that stick at the rear stop thing.....if it isn't there every time something's wrong! Slower, slower, slower, at the stop now.... and TOUCHDOWN! Crap, I haven't flown for over 2 weeks, getting air horny.
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Re: Newbie Backcountry - Bouncing on rough ground

Alright definitely great advice and because of it I think I found the winner. Went out, did a little practice and then hit some of my off airport spots. I definitely was bouncing so much before because I was just going fast, wasn't necessarily flying but bouncing off the terrain a lot and eating up ground. There was a little flying still left in the plane too because of my wheel landing idea.

Here's what I tried that worked out fairly consistently. Come in about 40-100 ft up after I've found my spot, get down to 45 kt (12 above my bottom end), keep a little power but use the decent as the primary source of energy. Full out flare into a 3 point landing (minimal power) and as soon as the mains touch (or I have enough energy from the decent), pull the power and immediately dump all the flaps while in the 3 point. Just after I dump the flaps, hit the brakes and lift the tail a little for visibility if I have the distance. I also found that without power I can't really scrap the tail first, due to my 26's, which I think is good news.

I also lowered the tires down to 4 psi, which seems to grab a lot more at touchdown than 6 going into sand, but I was rolling through some 8" deep holes and I couldn't even tell.

This style was quite consistent today and allowed me to land shorter than i could depart. That's definitely a winner for me, thanks for the advice!
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Re: Newbie Backcountry - Bouncing on rough ground

Be sure that you get power and pitch managed. Power and full flaps or slip maintains glide angle and vertical speed of descent. Pitch controls speed. You do best when you get rid of all altitude and all excess speed before touchdown on the desired spot. The shallowest angle possible gives you ground effect soonest, but you need to see the spot over any obstructions unless you can rudder turn around them in low ground effect. On steep approaches ground effect will not have much time to arrest the descent without considerable power at the bottom. The less you use power/pitch to control angle and speed, the less control you have. Power off, using gravity thrust, will make you go long and fast unless you have spoilers or roundout and flair and hold off long before the spot.

As others have said, using the airspeed indicator is a great situational awareness limitation on short final. There is just too much you need to see outside, hear relative wind, feel relative buoyancy that may or may not agree with trend instruments.
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Re: Newbie Backcountry - Bouncing on rough ground

Image

As aktahoe puts it, if it looks rough it is. Not sure if these guys were planning to land or not, they reported smelling gas and doing a precautionary landing but they were only 10 minutes or so from an airport. Looks like they saved the tailwheel though.
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Re: Newbie Backcountry - Bouncing on rough ground

Karmutzen wrote:Image

As aktahoe puts it, if it looks rough it is. Not sure if these guys were planning to land or not, they reported smelling gas and doing a precautionary landing but they were only 10 minutes or so from an airport. Looks like they saved the tailwheel though.



aktahoe stole that saying from someone else, but it sure doesn't make it any less true!

They must have had some other problem, that doesn't look that bad, for those tires, unless they were some other hazards out of the picture frame. That gear looks like an upward/high descent rate/bounce failure, not ripped backwards like when running into too large a rock. Guess how I know? The picture is not real definitive of unseen hazards in other words, looks like some other issue helped things along.
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