Today's Message Index:
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1. 05:38 AM - Kevin's post (Douwe Blumberg)
2. 06:38 PM - Re: 100 Report NX899KP (Dan Yocum)
3. 07:57 PM - Re: 100 Report NX899KP (kevinpurtee)
Message 1
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Kevin,
Thanks for taking the time to post your results, and especially for being
such a great ambassador with the young eagles. They are the future of grass
roots flying.
Douwe
Message 2
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| Subject: | Re: 100 Report NX899KP |
Kevin,
I think you've shocked everyone into silence! Luckily, I'm rarely at a
loss for words... often to my detriment, of course. ;-)
100 hours in 8mo is amazing! I could only dream of having that much
time to fly. Granted, we get snow, and I don't have skis, yet.
I have some questions:
100' to get the tail up - do you have gap seals on the elevator?
I don't have the FBL Fact File handy and I'm too lazy to look for it -
what size/pitch prop did you finally end up on? I'm bit surprised that
wide open, you can only hit 85mph. N8031 with a 74/42 cruises at a
respectable 88-90mph, though the climb rate isn't anything to write home
about - yours is much, much better.
Look forward to see you at Brodhead this summer!
Cheers,
Dan
On 05/16/2010 08:41 PM, Rick Holland wrote:
> Sounds good Kevin, bet the Young Eagles kids love getting a ride in an
> open cockpit, much more exciting than riding in a 140 or 172. What size
> prop are you using? Have you thought of trying a lower pitch prop to get
> a little higher rpm?
>
> rick
>
> On Sun, May 16, 2010 at 12:34 PM, kevinpurtee <kevin.purtee@us.army.mil
> <mailto:kevin.purtee@us.army.mil>> wrote:
>
> <kevin.purtee@us.army.mil <mailto:kevin.purtee@us.army.mil>>
>
> Its taken 8 months to get here. Had hoped to get 200 hours in the
> 1st year but life keeps getting in the way.
>
> Mechanically, most the bugs have been worked out.
>
> Im a little surprised at how quickly its gotten nicked, scratched
> and worn by routine use, mostly as a result of bugs, vibration and
> Young Eagles.
>
> Realistic performance numbers with the Corvair:
> Static RPM: 2650 (this was with the original pitch. I changed it &
> then went back to it.)
> 2500 RPM = 72 mph
> 2600 RPM = 77 mph
> Level flight, WOT gives 2750 RPM and 85 mph
> Rate of climb with just me: vigorous (~700 fpm on a cool day at sea
> level.)
> Rate of climb with a full grown passenger: dignified (havent measured.)
> Fuel burn: 5 gph
> Stock fuel tank makes for short legs and lots of fuel stops,
> especially with headwinds.
>
> Flight numbers:
> Take off: pretty quick tail up in ~100 feet, off the ground in ~250
> Stall: really slow
> Final: ~60 mph
> Landing: pretty slow
> Roll out: pretty short
>
> Cross countries:
> 2 day trips at 400 miles all day affairs
> Several 200 mile trips
>
> Number of landings: ~350 (several with the motor stopped,
> intentionally, for practice in carefully controlled situations.
> Behaves the same as with the engine at idle.)
> Number of attempted ground loops: several
> Number of successful ground loops: 0
> It likes to be wheel-landed.
>
> Number of passengers: 13 different people (8 Young Eagles)
>
> Kevin Purtee
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=297907#297907
>
>
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>
> --
> Rick Holland
> Castle Rock, Colorado
>
> "Logic is a wreath of pretty flowers, that smell bad"
>
> *
>
>
> *
--
Dan Yocum
Fermilab 630.840.6509
yocum@fnal.gov, http://fermigrid.fnal.gov
"I fly because it releases my mind from the tyranny of petty things."
Message 3
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| Subject: | Re: 100 Report NX899KP |
The prop is a 68" warp drive. I tried decreasing the pitch. The static went up
~150 rpm. Gave me a slightly improved climb, slower top speed and more fuel
burn (all to be expected). I put it back the way it was. I could probably try
to increase the pitch and improve that top speed but it flies so darn good
now I'm reluctant to change it. Given my short legs it doesn't matter too much
anyway. (You know, if I hadn't verified that my airspeed indicator reads 10%
high,I could lie about the top speed in good conscious...)
I don't have gap seals on the elevators. The tail comes up really quick just the
way it is.
Kevin
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=298028#298028
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