Kev Bamber Posted October 23, 2011 Share Posted October 23, 2011 I have a Zenoah G230PU petrol engine in a Flair Fokker Dr1. The G230PU is one of the earlier magneto ignition 23cc Zenoahs. Starts, runs and throttles well, but pulls less RPM than I expected. On a 20x6 Menz prop I see approx 5400rpm - definately overpopped! So fitted smaller recommended 18x6 prop and see around 6800rpm on a static test. Would this be reasonable or a little low for this type of engine? Kev Quote Link to comment Share on other sites More sharing options...
Alan Cantwell Posted October 23, 2011 Share Posted October 23, 2011 same engine i had in mine, and it was superb, but for the life of me, i cannot remember what size prop it had, but i would look at about 17x6, try the 18 first, LOVED mine, and want another Quote Link to comment Share on other sites More sharing options...
Lee Smalley Posted October 23, 2011 Share Posted October 23, 2011 6 to 7 K is fine for a petrol engine, not sure why your so obsessed with RPM its in a fokker DR1 is it not ??? why would you be bothered about every RPM? i would just fit a prop that look most scale, and as long as the engine runs well on it and flies the model, who cares ?? Quote Link to comment Share on other sites More sharing options...
Kev Bamber Posted October 23, 2011 Author Share Posted October 23, 2011 Not Obsessed, just asking cos this my first petrol. Quote Link to comment Share on other sites More sharing options...
Lee Smalley Posted October 23, 2011 Share Posted October 23, 2011 ahh, no manual or anything?? ok well stick to the 18x8 or 6 6-7 k is fine for a petrol have a dig around on internet ZG23 is a popular engine, there will be loads of info out there Quote Link to comment Share on other sites More sharing options...
Alan Cantwell Posted October 24, 2011 Share Posted October 24, 2011 prop i had on mine was a Menz 17x8,(found the broken one last night) it was fine on this prop, but i would be tempted to try a Menz 18x6, loved the DR1, but it was was a devil to keep on an even keel, last time out, i just started to relax at the end of the landing run, and over it went, displacing the crank, and breaking a new prop, sold it on as a display model after that, but looking for another, it was so much fun, Edited By Alan 4 on 24/10/2011 18:16:12 Quote Link to comment Share on other sites More sharing options...
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