> Re: Pietenpol-List: Re: High density altitude
Posted: Wed Nov 22, 2006 12:16 pm
Original Posted By: "walt evans"
Guys,The Koch chart gives a pretty good idea of how performance is affected at higher altitude airports. A quick look at the chart show anaircraft that climbs at 500 fpm from a 50 degree sea level airport willclimb at about 200 fpm from a 50 degree 6000' airport. (At 100 degreesit will drop to around 100 fpm.)Tom Bernie> Rick, Dad's corvair was putting out somewhere in the 90-100hp range> with a marvel scebler ma3spa carb and no blower fan. We are located> at about 1000msl in central Ohio and even on a hot day (90 +) with> full fuel and me (180lbs, empty wt 732lbs with batt and starter), I> can get an initial climb of 600 -700ft/min. That would put the gross> wt at about....990lbs. On a 90 deg day during the test phase I> climbed to 8000msl and had no problems and was still getting 200> ft/min est. as alt increased. It may have got better if we had a> mixture control but that is too high out here in Ohio for practical> flights,I was up there just to see if It would do it, and to cool off.> Besides airliners coming in to Port Columbus Airport (20 miles south)> get a little to big in the windscreen for my taste. I would guess> with a single person and 10 gal of "go juice" It will climb like a> heavy 150. The other good thing is at 50-55mph your not covering as> much ground as you would in a 150 climbing at 75-80mph, so that runway> is still below you for just a little longer if you need it.> My 2 cents worth,> Shad> > Clif Dawson wrote:> Subject: Re: Pietenpol-List: Re: High density altitude> airport> > > My airport is at 6840, over 10,000 density altitude on> a hot day. Am going with a Corvair (100 HP), will let> you know if it's enough. I have flown 150s (also 100> HP and 1000lbs empty weight) many times with a> passenger from similiar altitude airports and did ok> so it should be enough. > > Rick> > > > ________________________________________________________________________________Date: Wed, 22 Nov 2006 13:48:10 -0500
Guys,The Koch chart gives a pretty good idea of how performance is affected at higher altitude airports. A quick look at the chart show anaircraft that climbs at 500 fpm from a 50 degree sea level airport willclimb at about 200 fpm from a 50 degree 6000' airport. (At 100 degreesit will drop to around 100 fpm.)Tom Bernie> Rick, Dad's corvair was putting out somewhere in the 90-100hp range> with a marvel scebler ma3spa carb and no blower fan. We are located> at about 1000msl in central Ohio and even on a hot day (90 +) with> full fuel and me (180lbs, empty wt 732lbs with batt and starter), I> can get an initial climb of 600 -700ft/min. That would put the gross> wt at about....990lbs. On a 90 deg day during the test phase I> climbed to 8000msl and had no problems and was still getting 200> ft/min est. as alt increased. It may have got better if we had a> mixture control but that is too high out here in Ohio for practical> flights,I was up there just to see if It would do it, and to cool off.> Besides airliners coming in to Port Columbus Airport (20 miles south)> get a little to big in the windscreen for my taste. I would guess> with a single person and 10 gal of "go juice" It will climb like a> heavy 150. The other good thing is at 50-55mph your not covering as> much ground as you would in a 150 climbing at 75-80mph, so that runway> is still below you for just a little longer if you need it.> My 2 cents worth,> Shad> > Clif Dawson wrote:> Subject: Re: Pietenpol-List: Re: High density altitude> airport> > > My airport is at 6840, over 10,000 density altitude on> a hot day. Am going with a Corvair (100 HP), will let> you know if it's enough. I have flown 150s (also 100> HP and 1000lbs empty weight) many times with a> passenger from similiar altitude airports and did ok> so it should be enough. > > Rick> > > > ________________________________________________________________________________Date: Wed, 22 Nov 2006 13:48:10 -0500