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| Over Square Power Settings http://t18.net/thorpforum/viewtopic.php?f=8&t=6616 |
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| Author: | Jim Mantyla [ Mon May 09, 2011 7:04 pm ] |
| Post subject: | Over Square Power Settings |
Guys, I was out for my second Thorp flight since last fall. I played around with power settings and found that by cruising at 2200 rpm and 24" , I got 160 mph where as last fall at 2350 squared got me 155 mph at best. This is with a 160 hp IO-320 and C/S prop. Looks like there is something to the over squared setting that are being suggested. I will have to play around a bit to see if there is a definite sweet spot that I can percieve. Oh, yes it was good to see that I still remembered how, and was able to use the plane again after a 6 month period of not flying. Jim Mantyla |
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| Author: | jfkenton [ Mon Jun 27, 2011 9:04 pm ] |
| Post subject: | Over Square Power Settings |
I believe that the "squared" concept is from the days when we worried about overboosting an engine. Most of my flying was with round engines and it was standard to carry a higher manifold pressure number than RPM number-- unless you were using a power setting that was above cruise power. |
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| Author: | admin [ Tue Jun 28, 2011 7:53 am ] |
| Post subject: | Over Square Power Settings |
As a past USMC C-117 (Super DC-3) pilot, we always had a higher MAP than RPM and were restricted from less MAP than RPM because it caused under boosting and piston slap. GK N444DD *** admin posted for Graham Kerr *** |
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