Hi Bruce, Nice Video. We are just going into winter in New Zealand so not much flying at the moment. Re low RPM Are all compressions ok. Check tappets I set to 6thou inlet and 8 exhaust What do the spark plugs look like. The centre anode should be a slightly darkish brown and all plugs should look the same Check out the condition of the carb rubber diaphragms there may be a split one. Easily done by taking the top off the carb. Be careful putting it back together the diaphragm has a little key protrusion on it. Replacement “kits” for those carbs are still available I have had a magneto failure... caused by a failed condenser .. had a 20 year life of no action then broke down after around 120hrs. But that was a dramatic power loss. Presumably the mag has had its 2 year bench check and the timing was set up correctly Also presumably the prop has had its 7 year maintenance “relife”. If so maybe the pitch angle is too coarse. Just a few ideas. I would be interested in what u find
We get around 2950 static 3200 at 55kts climb in fine pitch Cruise at 2800 to 2900. Coarse pitch and cruise speed around 90 to 95 kts Our Dimona is a early one with the original aileron push rod configuration so we do get some aileron upward deflection at cruise. Not a bad thing tho ... both ailerons deflect upwards around 15 to 20mm giving some reflex. Best regards Ian Williams ZK-GCB New Zealand Sent from my iPhone > On 2/06/2020, at 1:23 AM, pattoninfl.aol.com via dog > <[email protected]> wrote: > > Hello All, > > We now have our Dimona flying again after her 12 year hiatus. Check out the > video: > > https://youtu.be/kKg5CO4YZlw > > I was able to fly her but we are still getting limited RPMs. On ground I was > barely getting the required 2700 RPMs. In flight the most I could get was > 3000 RPMs. Due to this she had a much slow climb than experienced when I > flew her 12 years ago. When I tried to fly her yesterday, which was a much > hotter day, I could only get 2500 RPMs during preflight checklist so I didn't > fly. > > Can you give me any suggestions that might be causing the loss of RPMs? > > Thanks, > Bruce Patton > N22TC
