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2 stroke or 4 stroke? - 11/19/2012 4:26 AM   
johndavis


 

Posts: 275
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From: rossville, GA, USA
Status: offline 		was wondering  the positive's and negitives of both.

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RE: 2 stroke or 4 stroke? - 11/19/2012 4:49 AM   
jester_s1


 

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From: Fort Worth, TX, USA
Status: offline 		In a nutshell...

2 stroke positives: More power for engine size and weight, simpler operation, lower price, higher RPM performance for high speed flight
2 stroke negatives: peaky torque curve, less fuel efficient for the horsepower it makes, sounds like a constipated mosquito

4 stroke positives: more torque for turning larger props, accelerates faster and more smoothly, more fuel efficient, sounds more like a real airplane engine
4 stroke negatives: costs more, often heavier for the same amount of power, must be roughly 25% bigger to make the same power, valves have to be adjusted right, tuning requires a little more skill, tops out around 10k rpm so has a much smaller RPM range.

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RE: 2 stroke or 4 stroke? - 11/19/2012 5:35 AM   
Gray Beard


 

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From: Hemderson, NV, USA
Status: offline 		Depends on the brand of the engines too. I don't see a negative with either except price. I just like four strokes better then two strokes, good four strokes. I have found a cheap two stroke I like a lot too.

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RE: 2 stroke or 4 stroke? - 11/19/2012 12:36 PM   
JohnBuckner



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From: Kingman, AZ, USA
Status: online 		Entirely dependant upon the mission of the airplane and I do use and fly a wide variety of just about every power system type that has ever been used, but for basic sport flying I much prefer the "Constipated Mosquitos"

John

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RE: 2 stroke or 4 stroke? - 11/19/2012 1:31 PM   
jetmech05


 

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From: Jacksonville, FL, USA
Status: offline 		I think jester nailed it

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RE: 2 stroke or 4 stroke? - 11/19/2012 1:50 PM   
jester_s1


 

Posts: 3805
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From: Fort Worth, TX, USA
Status: offline 		I agree with you JohnBuckner. The 2 stroke is really the best power system for most planes simply due to its light weight and big RPM range. 4 strokes make sense when you need a lot of torque to spin a big prop (like on 3D aerobats) or want a full scale sound.

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RE: 2 stroke or 4 stroke? - 11/23/2012 2:29 AM   
johndavis


 

Posts: 275
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Joined: 11/1/2009
Last Login: 5/4/2013
From: rossville, GA, USA
Status: offline 		thank you for your great responces.  im going with the 2 stroke . i have experience with the 2 stroke engines    i race rc cars. i have never been around the 4 strokes   i will try one of them later on after i learn how to fly.   im going to build my first airplane for the experence of doing it.  and building your own will teach me how to repair it after i crash it a time or two.   lol

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