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lucien
Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM
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 Posted: Tue Apr 01, 2008 1:16 pm Post subject: Re: EAA Sport Pilot article - two-strokes and forced landing |
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[quote="lucien"] | John Hauck wrote: | Subject: Re: EAA Sport Pilot article - Oops, that's John H. quoting someone else, not John himself... sorry
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LS
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gaman(at)att.net
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| Posted: Tue Apr 01, 2008 2:10 pm Post subject: EAA Sport Pilot article - two-strokes and forced landings? |
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Micheal,
Thank you once again for your insight and thoughtful input.What could I have been thinking?
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aoldman(at)xtra.co.nz
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| Posted: Tue Apr 01, 2008 4:25 pm Post subject: EAA Sport Pilot article - two-strokes and forced landings? |
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About 400hrs behind{or infront of } 503s and no forced landings.One instance
when the fiberglass fuel tank delaminated and blocked the fuel line from the
tank but I was able to keep it going by pumping the hand primer bulb as I
was only about 5 miles from the airport and a couple of other times carb
icing got my attention when reducing power to land. The 503 has alwas
retuned me to my take offpoint
Tony
Downunder
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Don G
Joined: 10 Jan 2006
Posts: 156
Location: Central Illinois
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| Posted: Thu Apr 03, 2008 12:43 pm Post subject: Re: EAA Sport Pilot article - two-strokes and forced landing |
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Cristal...posted originally on mar 7 07, It may give you another perspective on this subject.
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Mr. Murphy,
Let me reply to your question with a terribly long but pertinent discourse on the 2 cycle/4 cycle subject.
This question cannot truly be answered because it does not have enough parameters. It is kind of like asking which is better a Ford or Chevy. When a person eliminates brand loyalty and gets down to the details..not enough parameters. For instance..which is better, a Corvette, or a Pinto? And what features weigh the most in your desires? GAs milage?, or life? or maybe 1/4 mile speed...or top speed possibly, or cost.
The issue of reliability needs more details too. like "Reliable for how long?
So which 2 stroke vs which 4 stroke?
And for how long. Detroit deisel makes 2 cycle engines which are reliable for many more hours of service than , say..a Rotax 912 or a Lycoming IO-360
Tecumseh makes a small 2 cycle engine that is very reliable for about 50 hours..then it is wore out and will become unreliable. IT does very well in its intended market.
One can look at the content of Brother Steve B's answer and determine that Steve's priority characteristic is power to weight ratio, and it is very hard to create a 4 cycle engine that can beat a 2 cycle in this arena, so he is right according to his highest priority.
But if longevity of service is a higher priority, then a 4 cycle might be the winning choice, but which particular ones? As the above examples indicate, more specifics are needed.
And of course, how about cost...a factor that certainly might play highly to one list of "preferred characteristics".
When we isolate our choices to engines suitable and commonly used on aircraft, which undoubtedly you are thinking. There still needs to be more parameters for an accurate analysis. Which specific engines and what lifespan is desired or determined "acceptable " in terms of hours of service before the lack of reliablility due to excessive wear is discounted as "expected".
Generally 2 cycles run at a higher rpm so they wear faster..But really fast 4 cycles will wear at near the same rate. Ring/cylinder/skirt wear is a function of piston speed first...other factors second. This generally gives faster engines less service lifespan. It DOES NOT necesssarily make them less reliable.
WIth IC Engines, Like with different designs of aircraft, features of performance are generally all compromises with other features. Fast wings vs low stall wings. High wing loading vs low wing loading..neither is better than the other generally, but there are obvious winners when more parameters are given and priorities arranged by either mission requirements, or other desires deemed most important.
So in a nutshell, the definition of "reliability" needs an expected service life parameter to start an accurate....errr..debate!!!
(Cristal...another possibly better way to ask the question you proposed is, by specifing which 2-stroke engine, vs which 4 stroke engine)....I think..
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