RPM TEST----- GEORGE

RPM TEST----- GEORGE

<HTML>Hi  George

OK george I took my airplane pointed the plane into the wind the wind was 020@11kts the ambient temp. was 15c standard atmospheric conditions.
The static RPM was only 2120 on a brand new tach that was installed @  my first
anual the new tach only has 25 hr's on it.And it was also calibrated with a digital
mini tach and the readings were within 2to4 RPM.I thought that was pretty good.
Anyway, could my prop be out of tolerance @ the tips .The prop has been inspected @ every anual and found to be in an airworthy condition.Do you think I need a to look into a new prop.I also had the mags timed correctly.Today I took it around the patch  to test the vsi it was 800 to 900 momentarily and settled back down to around 500 fpm I was holding 80 mph on climb out best I could it was alittle turbulent. I noticed as always the tach reads 2300RPM on climb out.
What's your opinion George.


sincerly         Vaughn</HTML>

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Re: RPM TEST----- GEORGE

<HTML>Hi Vaugn,

A bent prop may be one of several reasons you are not achieving static RPM.
A quick and easy check is to grab a push broom, hold it against the nose tire, and slowly rotate the prop in the opposite direction of normal rotation.
See where each end of the prop leaves a mark on the broom handle.  They should be within 1/16" of each other.

On a guess, you have some other condition affecting your engine.  It's been my experience that bent props (usually done by someone pulling hard near the tip) gives a rough engine feel and even a helicopter "thupping" sound.

Hope this helps,
RH</HTML>

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Re: RPM TEST----- GEORGE

<HTML>When I recently had a prop repitched on my 172 - the prop shop recomended that I first have them inspect it and check for the actual pitch - various pitch specifics all along the length of the prop - it was running at - compared to what it was supposed to be. I think the inspection/measurements were between $100 and $200. Maybe it will help. ?

Ken</HTML>

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Re: RPM TEST----- GEORGE

<HTML>If your prop is airworthy and within specs for a std. prop, and if your tachometer is reading accurately, and it it's a std atmospheric day, and if it still doesn't make rated static rpm for that engine and that prop, then the only thing left to look at is engine performance. 
Keep in mind that there are lots of things that affect engine performance before you start ripping cylinders off and overhauling engines.  Is the intake manifold in good shape with no leaks?  Is the exhaust also in good shape with no obstructions?  (Things like a muffler baffle or flame-cone that's become dislodged and blocking the exhaust gases?)  How about the carburetor?  Is it the correct model and mod status for the engine installation? 
Troubleshooting is a step by step process of elimination.  Try to eliminate the less expensive things first.  Get a local mechanic who is reputable to assist you in the process.  Good luck.</HTML>

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