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Armed with the equation from John Cooper and again refering to the Continental Operator's Manual I have calculated the following Torques. There are two HP curves in the manual - one is for max throttle and a given RPM, the other is for a C85 prop developing 85 HP at max throttle at 2600 rpm and lower throttle (and hence HP) at the lower RPMs. See the .JPG file for results.
At max throttle the torque curve is flat at about 172 to 174 ft lbs
With C85 prop it climbes steadily from 126 ft lbs at 2200 to 172 ft lbs at 2600 rpm - no flattening at all.
Seems to me the last post was the relevant one - regarding actual dynamic loading of the rotating pieces vs the pressure exerted by the expanding gasses. I also plan to keep my climb prop and reduce throttle in cruise. Actual extra time saved at higher speed is negligible - also extra wind blows my hair
Jack
N3667H 415 C
On 8/4/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----In a message dated 8/4/2006 12:28:59 P.M. Eastern Daylight Time, [EMAIL PROTECTED] writes:My recommendation is to pick the prop that gives the climb performance you need and let the cruise chips fall where they may.I certainly agree with this, hit the whiz wheel once and see the differencebetween 4 knots speed on a stage length of, say, 150 miles. Reallyinterested in speed look at the new VLJ's.John==============================================================================
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--
Jack Hirsch
[EMAIL PROTECTED]
<<attachment: C_85_HP_Torque.JPG>>
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