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44 votes
Accepted

Starting on the left magneto only - why?

The reasons seems to be that only the left magneto is equipped with an impulse coupling which delays and intensifies the spark during engine starting: Many opposed reciprocating engines are equipped ...
Bianfable's user avatar
  • 56k
34 votes

Can I sell a 1975 Piper Cherokee Archer II with no Logs?

It's definitely worth getting the records figured out, it will make a huge difference to the price and bring many more buyers. Fortunately all is not lost. Maintenance organizations keep records of ...
GdD's user avatar
  • 54k
29 votes

How does the fuel pump work in a PA-28 and when should I use it?

The PA-28 Family of aircraft have two fuel pumps, an engine driven mechanical pump that is always pumping (so long as the crank shaft is spinning) and is considered the "main pump". The ...
Dave's user avatar
  • 101k
19 votes

Starting on the left magneto only - why?

Magnetos perform badly at low speed, and their timing will be too advanced during start, making the spark too early. Usually the left magneto has an impulse coupler, which is a coil spring driven cam, ...
GdD's user avatar
  • 54k
19 votes
Accepted

Why would a plane fly in circles?

The likely explanation is that the pilot was just making room for another aircraft. If a plane stops in the air, it stalls and falls, so planes can't (shouldn't in normal operation at least) stop in ...
Azendale's user avatar
  • 1,313
15 votes
Accepted

Unclear about how you can have high RPM but no power

The PA-28 Archer uses a fixed pitch propeller. Typically an aircraft with such a propeller, they are not fitted with a manifold pressure gauge as a means for gauging power output. Power output on a ...
Romeo_4808N's user avatar
14 votes
Accepted

Is it normal practice to use 25 degrees of flaps when taking off at max weight in a PA-28-181?

The PA-28-181 POH I have read says to set first stage of flap (10 degrees) for a normal takeoff, and 2 stages (25 degrees) for a short or soft field takeoff. I've flown PA-28s quite a bit and I've ...
GdD's user avatar
  • 54k
13 votes

Why does the PA28 only have one door?

Having one door is just a design preference which makes the aircraft simpler, and lighter to build. There are many other light aircraft with only one door. Besides Piper, most Mooney, Beechcraft, ...
Mike Sowsun's user avatar
  • 37.8k
12 votes
Accepted

What do a "sheared pump drive" and a "possible sticky vacuum regulator" mean?

There is a small vacuum pump attached to the engine by a small rotating shaft which generates vacuum whenever the engine is running. That vacuum is used to spin up the gyro instruments in the plane. ...
niels nielsen's user avatar
11 votes
Accepted

Is it safe to fly if the flaps won't retract on ground?

The main thing to be concerned with, is that the spring tension is important for keeping the bicycle chain segment secure on the eccentric sprocket (item 17 below) that drives the torque tube. If ...
John K's user avatar
  • 132k
10 votes

Why does the Piper Cherokee (PA-28-140) engine have such low horsepower despite the very large displacement?

One reason is not so much can you build a reciprocating engine with higher horsepower or better efficiency, but can it do so with a very high reliability for extended periods. Most automobile engines ...
Romeo_4808N's user avatar
10 votes
Accepted

Where can I find (or how can I calculate) the glide ratio for a PA-28-181?

If you were to take off from an airport at 2,000' ASL on a standard day, and climb to 7,280' ASL you would be exactly 5,280' above the ground which means exactly 1 statute mile above the ground. If ...
Mike Sowsun's user avatar
  • 37.8k
10 votes

Nose gear weights

In a tricycle gear aircraft, the nosewheel supports little of the weight. The center of gravity of the aircraft is only slightly in front of the main gear, and so the nose gear only has to hold the ...
Chris's user avatar
  • 15.9k
9 votes

Unclear about how you can have high RPM but no power

From a physics standpoint, power is defined to be (force x velocity); in rotary shaft work terms this is (torque x RPM). This means that a device that produces 100 ft-lbs of torque at zero RPM (shaft-...
niels nielsen's user avatar
8 votes
Accepted

What are the "Start & Acc" and "Pitch stab" circuit breakers for on the Piper Dakota?

It is for (two) accessories and the starter, they are on the same 15A circuit breaker. The page you want to look at in the POH is Section 7.17 (this is figure 7-11): I know the image isn't all that ...
Ron Beyer's user avatar
  • 36.2k
8 votes
Accepted

Does weight affect the fuel burn calculations in a light GA airplane?

The engine doesn't care how heavy the airplane is (or how well it is flying), but you might. As long as you are cruising around at a particular altitude and power setting, then the engine is going to ...
BowlOfRed's user avatar
  • 5,621
7 votes

Why does the Piper Cherokee (PA-28-140) engine have such low horsepower despite the very large displacement?

A modern aircraft propeller must be designed so that the tip speed is less than supersonic so as to avoid issues with noise and performance. Most small plane propellers are about 6 feet in diameter ...
Tom's user avatar
  • 71
7 votes

Where is the fuel vent on a Piper Archer TX?

There are four main tank vents on all PA28 (Cherokee/Warrior/Archer/Dakota/Arrow) aircraft, two in each tank. The most visible vent is under the wing at the outboard aft side of the fuel tank (near ...
voretaq7's user avatar
  • 68.4k
7 votes

Is it normal practice to use 25 degrees of flaps when taking off at max weight in a PA-28-181?

I should preface this answer with 2 prudent points My first flight of a PA-28 (Im unsure the exact model) was a week ago. I have roughly 250 hrs on Cessna 150/152/172 The answer to all of these ...
Jamiec's user avatar
  • 33.4k
7 votes
Accepted

What are the equations to compute takeoff and landing distance?

I did this, using Fortran 90 for the math and Tcl/Tk for the plotting. There is no single equation; instead there are several cycles of calculation nested inside each other like a Russian matryoshka. ...
Peter Kämpf's user avatar
7 votes

Why would a plane fly in circles?

IFR holding patterns, whether waiting for a runway or waiting for other traffic to clear when en route, tend to be ovals, although they can be distorted by wind. The standard holding pattern is ...
Deepstop's user avatar
  • 171
6 votes

Where is the pitot static drain located on a Piper PA-28?

This presentation gives a nice overview of various systems on the Piper Cherokee series. The buttons you describe are shown here: (slide 9) The full pitot-static tube including the drain is shown ...
Bianfable's user avatar
  • 56k
6 votes

If alternator fails and I'm running on battery power, what equipment can I turn off to conserve power?

I experienced this once in a night IFR training flight in VMC. The aircraft was a Cessna 172RG Cutlass. I was on an ILS when I noticed the low voltage light on. I decided to wait until missed approach ...
Fred Larson's user avatar
  • 2,468
6 votes

Can I sell a 1975 Piper Cherokee Archer II with no Logs?

Logs aren't required to sell it. Just put out an ad saying what you know about it. The sale price will be significantly less, but besides finding the logs there's nothing you can do about that. ...
Chris's user avatar
  • 15.9k
5 votes

Will I have to do a checkout ride at a rental place if I'm already familiar with the aircraft type?

Generally they will make you do a checkout with their own instructor, at least this is the situation I have always encountered when renting from various places. Generally speaking, when you go to a ...
Dave's user avatar
  • 101k
5 votes

Is it normal practice to use 25 degrees of flaps when taking off at max weight in a PA-28-181?

I'd like to add to Jamiec's excellent answer. The attached POH shows that the take-off distance with 25 degrees at maximum gross weight is a few hundred feet less than 0 degrees of flaps. While the ...
Devil07's user avatar
  • 8,574
5 votes

How much force can the landing gear of a Piper Arrow withstand?

The Arrow is certificated under 14 CFR 23, and the landing gear loading limits are specified in the ground loads and landing gear sections. I don't know much about this subject and the regulations are ...
Pondlife's user avatar
  • 71.8k
5 votes

Does the Piper PA-28 Cherokee have a limitation on its maximum lifetime flight hours?

Short answer, not in the United States; as long as the airframe is regularly maintained and passes its mechanical inspections, it can continue to fly. Some reasons this is so (when it might not be ...
KeithS's user avatar
  • 22.9k

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