Hot Props

Crocodiles and Propellers - Not Much Difference


Sometimes we need to be reminded just how dangerous a propeller can be. 

The first video below shows a fellow pulling a propeller through to check for nicks when the engine started and nearly took off an appendage. He said he could feel the prop brush his arm. Yikes!

In many instances, the ignition might have been left "hot" or a magneto didn't ground properly. Either one could result in the combustion of unburned fuel in a cylinder when a propeller is moved by hand.

This is why we should always treat the propeller as if touching it might cause the engine to start. In the first instance below, this was a three bladed prop on a Piper 6XT which positions your appendage close to the leading edge of a suddenly moving propeller.

The video below is from Flight Safety Australia. Please visit their site for a more complete description of the event.

 

Is Handpropping for You?

 Yes, people still handprop airplanes. It is, however, risky business. In spite of the risks, I believe you should be taught the basics of handpropping. Why? I know from experience that one day you might find yourself in a situation where you’ll be tempted to try this on your own. Doing so without prior training is not very wise. Besides, even if you elect not to handprop your airplane, basic instruction in the correct techniques will enhance your respect for the propeller. 

Find a qualified instructor who’s experienced in handpropping airplanes (he shouldn’t look like the guy in the cartoon picture above). Have that person show you the correct procedures, which include how to grip the propeller, the stance for best leverage and maximum safety, body movement and communication with the person inside the cockpit. 

Perhaps the most important rule for handpropping is to have a competent pilot, who’s familiar with the airplane, at the controls. Why? Once that engine starts, an airplane can move on its own and do a lot of damage. You don’t want this to happen to you. There are several recorded cases of airplanes taking off without a pilot on board after being incorrectly handpropped (try explaining that to the owner of the flight school).  The video below is an old FAA film showing what happens when an airplane isn't secured before handpropping. The fellow that did the handpropping left his non-pilot girlfriend in the airplane as he handpropped the machine. The engine started and..well...you'll see what happened.

 

By Rod Machado | | CFI Resource Center, Learning to Fly | 2 comments
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Comments

  • Brian Richmond - January 28, 2016

    I recently read a piece you did for the AOPA magazine. I’d love for you to see this but who knows. I’m currently 15 and I live in Texas. I started my flight training in December of 2015. The only reason I did so was because the games I was exposed to didn’t feel real. I wanted to be able to do what I wanted. Being a pilot was always something I’ve wanted to do and now I’m learning to fly a Cessna 172. The article really struck me here, quote “We no longer allow young folks to do as many physically interactive and competitive things…” and now that I think about it there is only one other kid my age going through lessons at the same airport. Everyone there is much older and there is no young pilots. I went to school one day and it was career day I was in 10th grade and still am, but there was a pilot. We had many career people in that hallway to inform us of all of the careers but everyone was at the software engineer or the video game design and testing table. I was the only one to go up to that pilot and ask him questions that wern’t required. He said I was the most interested person so far but that didn’t set me off until I read your article. No one in my school wants to be a pilot that I know of. None of my family members or anyone else that I know is even thinking of being in the pilot’s seat. I just wanted you to know your article gave me alot of hope for my future.

  • Rob Mixon - January 07, 2016

    Rod,
    In the 1950’s there were two, not one but two, J 3 Cubs in Long Island New York that actually took flight without pilots until they ran out of gas and crashed! Very important to always tie the tail when hand starting a plane. And as the old rule goes always have a certified pilot inside of the airplane….

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