HELP ME GEORGE ! ! ! ! ! ! !

HELP ME GEORGE ! ! ! ! ! ! !

<HTML>Hey george can you tell me why my airplane only gets 500 FPM @ 80kts
with only me in it. It's a 1965 C-172F. I only weigh 215lbs
should I be concerned about this.
I had a compression check done and 

8/20/01        8/6/01           3/1/01         
#1--68        #1--60             #1--64
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My engine has 1300 SMOH
2770--TT
Do you think my engine is just tired? I'm I being paranoid ?
I just don't feel that It's climbing they way it should.
And yes my prop is a standard prop (McCauley 1C172/EM)
PROP MODEL EM 7603
HUB SER.# E 11104
And also do you think the flucuations in the cylinder compression is normal
HELP ME GEORGE!!!!!!!!</HTML>

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Re: HELP ME GEORGE ! ! ! ! ! ! !

<HTML>Hi, Vaughn!  Don't panic yet.  First, your prop is probably not a 7603, but a 7653 which is a standard prop for the O-300-C or D powered 172.  The compressions in your engine not only look normal, they actually look very good.  (In the old days mechanics thought compressions in the 60's were a bad sign, but this has proven false.  Compressions as low as 45 still produce rated horsepower and are allowed provided the loss is only past the piston rings and not any valve.)  It's far more likely that the density altitude is the cause of your VSI reading.  What was temperature and pressure altitude at the time you made the observation?  Get out the old Owner's Manual and the E6-B computer and figure out what the rate of climb should have been at that density altitude.  If it still reads incorrectly (like more than 20% off standard performance as depicted in the owner's manual or Approved Flight Manual), then you should look at calibration of your V.S.I. and your airspeed indicators, and the rigging of your aircraft for drag inducing conditions.</HTML>

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Re: HELP ME GEORGE ! ! ! ! ! ! !

<HTML>P.S. - And by the way, what is the recommend Vy for your aircraft?  Are you sure it's 80 kts.?  My book shows it to be 80 M.P.H. which is more like 70 kts.</HTML>

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Re: HELP ME GEORGE ! ! ! ! ! ! !

<HTML>500 fpm climb on an average temperature day in your 172 is pretty good. That 145 hp 0-300D is working pretty hard. I had a 1966 172g for about 12 years, and a 3-500 fpm climb seemed about normal. I changed all of that by getting a 182. It sounds like your airplane is just fine. The 7653 prop does not promote a fast climb rate either.
Glenn</HTML>

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Re: HELP ME GEORGE ! ! ! ! ! ! !

<HTML>I agree with you Glenn, but the book does state that the ROC, standard day, gross wt should be 645 fpm, so with only one person aboard, 500 does seem just a bit low. (I have to admit, it's almost within the 20% I mentioned previously, though.)</HTML>

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Re: HELP ME GEORGE ! ! ! ! ! ! !

<HTML>You're right George (as usual) but he did not give you enough information.  645 fpm may be expected on a standard day but what were his conditions?  I would be almost certainly hotter than standard....I would be very happy with 500 fpm on a normal summer day here (DA 5500, w/temp of 97F.)  I do not think he has a problem.</HTML>

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Re: HELP ME GEORGE ! ! ! ! ! ! !

<HTML>Ok guys!

George you are right about the conditons but I live in OHIO and it wasn't that hot.
I can't remember what the temp was that day,and the density altitude sure wasn't a problem.I guest what I'm trying to say is that I've owned this plane for 2 years now, and I always felt like it just did'nt climb like the other older planes with the same engine I flew sometime ago.I just need to know that my plane is safe.
I've had everything checked that I think would affect this.Can you give me any additional insight on  this matter. I'm going to fly it this weekend to do some comercial maunuvers.I'll take note of the temp & density alt.
Sorry it took so long to get back to you .</HTML>

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Re: HELP ME GEORGE ! ! ! ! ! ! !

<HTML>All other things considered, I'd check the plugs too.</HTML>

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