I think it all depends on your reason for going low. If you need to be able to manuever horizontally in tight places (for example, you've been caught under a lowering overcast and are trying to get to an airport), then your "out" is horizontal turning and you should be flying slow with partial flap to give yourself minimum turning radius if a hill jumps out in front of you.
You can't turn worth a crap. You really can't turn worth a crap low and slow. If you try to turn steep low and slow you better be willing to unload the wings and lose a bunch of altitude. Otherwise you'll be meeting the ground and fast. Chances are if there is low clouds that forced you down you also have crappy visibility. I'm not a fan of sitting around low with crappy visibility in unfamiliar areas. If I ever get into a situation to where it gets really bad I'm either going to land in a field or I'm going to climb into the muck and tell ATC how stupid I am.
cwyckham said:
If you're going low for some other reason and your "out" is to pull up to get overtop of a hedge or something, then you want to have maximum energy. However, you also have to remember that the hedge will jump out much faster if you're moving faster.
Pulling up is about the only out you have. Things happen faster at speed but you are still WAY better off for getting out. I can be at 150 knots in the Diamond and have the engine quit and still EASILY pull and get up high to find a safe place to land. These guys that come in for these low passes with flaps out are going to be in trouble if the engine quits. They'll be too fast to stop and too slow to get out.
cwyckham said:
Cropduster speed is likely more for cost reasons than safety reasons, though having enough energy for a safe pullup is also important.
They are loaded heavy. They need to be able to go UP at the end of the field and not dick around slowly climbing. Airspeed is life. They need options if something goes wrong. Airspeed will give them those options.
cwyckham said:
No disrespect to the many skilled and safe cropdusters out there, but the last place I'd look for low flying safety advice for a low time pilot such as myself would be a crop duster.
If you want to buzz around low they are going to be the ones to listen to. They do it all day long. I'm willing to bet you'd watch most cropdusters and think they were unsafe as hell. But they know their airplanes and they know how to fly. They'll be coming in fast, pulling up hard, doing a wing over to come back for the next pass, going under the power lines, pulling hard.
We may be talking about a different kind of low. I'm talking LOW like 10' AGL. Unless I am landing there is no way I'm going to be low without a ton of energy to go UP.
I have a feeling you are talking about getting forced down to a few hundred feet because of weather. If that's the kind of low you're talking that is not what I'm talking about.
The best flying I ever was taught was low and fast. You learn how to fly much better at a low altitude because you are watching the ground and the horizon. If you look at the instrument panel for too many seconds you're dead. Like they say.. You always need two of the three:
Airspeed, Altitude, and Skill.
If you don't have two of them you are going to be in trouble.
There is no arguing it. If you feel the need to buzz something or do a low pass over something. You cannot have too much airspeed.