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Engine basics => Engine set up tips => Topic started by: Kelly Wilson on August 11, 2008, 11:48:49 AM
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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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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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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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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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I use one for RC and it compares very favorably to the Saito 56. Actually it leaks less oil.......