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Author Topic: 2 STROKE TO 4 STROKE CONVERSION  (Read 651 times)

Offline Kelly Wilson

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2 STROKE TO 4 STROKE CONVERSION
« on: August 11, 2008, 11:48:49 AM »
Whats a good rule of thumb for conversion on various kits/planes to 4 stroke engines?  Should it be by wing area ?? plane weight ?? percentage of 2 stroke displacement??  Most of the R/C kits have a recommendation, but I haven't seen anything on control line kits.

Kelly
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Offline Bob Reeves

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Re: 2 STROKE TO 4 STROKE CONVERSION
« Reply #1 on: August 11, 2008, 02:26:32 PM »
Most of us have found direct displacement substutes work well.. In some cases we have actually gone to a smaller 4 stroke, for example a Saito 56 will fly anything designed for a ST 60 and some, including me will say the Saito would be a better choice.
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Offline RandySmith

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Re: 2 STROKE TO 4 STROKE CONVERSION
« Reply #2 on: August 11, 2008, 04:36:19 PM »
Quote from: KELLY WILSON on August 11, 2008, 11:48:49 AM
Whats a good rule of thumb for conversion on various kits/planes to 4 stroke engines?  Should it be by wing area ?? plane weight ?? percentage of 2 stroke displacement??  Most of the R/C kits have a recommendation, but I haven't seen anything on control line kits.

Kelly


HI Kelly

There is not any real rule of thumb that works "across the board", you  would be best taking it on a case by case basis, and it will depend on what CL aircrafts you are asking about, stunt planes ,carrier, scale, sport, etc  . The engines could be ran very differently in these
Are you asking about strictly Stunt aircraft?

Randy
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Offline Kelly Wilson

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Re: 2 STROKE TO 4 STROKE CONVERSION
« Reply #3 on: August 11, 2008, 05:54:37 PM »
Hey Randy,
Basically stunt and sport. I already had a pretty good feel for it, I just wanted to get some other opinions. What Bob says makes good sense too. As a general rule the 4 stroke is going to pull a larger prop at a little less rpm although  some what steadier rpm.

I would appreciate hearing any one else's opinion and thoughts on the subject too. I just picked up a deal on one of the new OS 56a 4 strokes. Anyone had any experience with one of those?

Kelly
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Offline Scott Hartford

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Re: 2 STROKE TO 4 STROKE CONVERSION
« Reply #4 on: August 12, 2008, 04:32:39 PM »
I use one for RC and it compares very favorably to the Saito 56. Actually it leaks less oil.......
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