Propeller Vert or Hoz.

Those are excellent reasons not to turn the prop forward for safety. If you weigh the risks versus benefits, a mistake in your shutdown procedure can be physically disastrous. With my history of vacuum pump failures, I have gradually adopted this position using a consistent closed throttle/mixture cutoff at shutdown, very careful turning of the prop forward knowing that the prop could become live, and tying down the aircraft prior to prop manipulation. Checking your mags for proper grounding prior to shutdown is a good practice.
 
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And if you ride behind a Rotax, there are excellent reasons to not turn the prop backward - sucking air into the lifters is considered a bad thing by the Austrians.
 
Their are all sorts of vacuum back up and warning light systems for vacuum failure. If you don't trust your vacuum pump in IFR conditions why would you do it. Any small bit of rubber from any of the 50 year old hose behind the instrument panel goes into the pump it's gone. Vacuum pumps are $$$ changing the hoses behind the instrument panel a lot less, how old are your hoses. Also might want to change the vacuum filters pumps work a lot cooler with good filters, a good test hold your palm over one end of the filter hold it up to sunlight look in the other end if it's yellow change it.
 
The observation of the OP may be an illusion since "vertical" is a specific position while horizontal is pretty much everything else. So,

brien23 said:
...why is it almost all the planes on the ramps have props not vertical.
Click to expand...

may be an optical illusion.
 
Can't be cool like MacGyver if you leave your prop in a vertical position.
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