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grantr
Joined: 12 Sep 2007
Posts: 217
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 Posted: Mon Nov 03, 2008 7:49 am Post subject: MK III Climb performance with Rotax 503 update 11-10-08 |
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I found out my gps keeps a lot of information that can be downloaded to my computer. I can overlay my flight track on google earth and print out an excel spreadsheet with speed, altitude, and heading.
Anyway I just calculated the numbers and my average full power climb rate according to the gps during takeoff was 658 feet per minute at an average ground speed of 43.5 miles per hour.
Gross weight full fuel on takeoff 735 pounds
Temperature was about 69 degrees( weather channel says 73o during 3 pm however my house outside thermometer had a overall high of 69.8 for the day.) and the field elevation is around 460 MSL
My average speed on my trip during cruise was 54 mph.
Grant
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Last edited by grantr on Mon Nov 10, 2008 5:27 pm; edited 1 time in total |
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grantr
Joined: 12 Sep 2007
Posts: 217
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| Posted: Sun Nov 09, 2008 5:56 pm Post subject: Re: MK III Climb performance with Rotax 503 |
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Here are some more numbers from my gps today 11/9/2008.
My average full power climb rate according to the gps during takeoff was from 560 to 578 feet per minute at an average ground speed of 41.7 miles per hour. Indicated climb out of 60mph. The plane stalls at 41 indicated.
Gross weight full fuel on takeoff 735 pounds
Temperature was 64 degrees during 4 pm with 9 mph winds gusting to 15 at 280o.
I was using runway 23 so it was a good crosswind.
field elevation around 460msl
I reset my gps to make more measurements. During climb out it took 57 measurements in 5250 feet.
Not sure why I am 100 fpm short. I think I might have used 55mph indicated in the smoother air from last time on climb out.
Grant
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grantr
Joined: 12 Sep 2007
Posts: 217
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| Posted: Mon Nov 10, 2008 7:38 am Post subject: Re: MK III Climb performance with Rotax 503 |
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I did a more detailed analysis of my climb rate and the new average is 617 feet per minute out of 56 rate calculations :
750.00
720.00
750.00 50 agl 519 msl
720.00
740.00
745.71
742.50
733.33
744.00
763.64
750.00
715.71
701.25
673.33 202 agl 671 msl
651.00
651.43
636.52
619.20
620.00
622.76
624.00
611.25
600.00
591.43 345 agl 814 msl
590.27
592.31
588.00
583.90
581.43
583.26
577.33
577.83
575.74
573.06
563.53
560.77
563.77
569.45
572.14
567.93
568.00
564.19
563.44
565.85
568.66
566.09
559.44
555.62
554.59
554.21
553.08
547.50
544.39
539.29
533.72
530.34 at 769 agl 1238 msl
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JetPilot
Joined: 10 Jan 2006
Posts: 1246
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| Posted: Tue Nov 11, 2008 6:38 pm Post subject: Re: MK III Climb performance with Rotax 503 update 11-10-08 |
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I think those rates are great for a 503 on a MK III, it is more than I would have expected. Rough air can hurt climb rates, I would take the readings in perfectly smooth air. Also wind gradients can affect climb rate, If you run into more head wind you can have spikes...
I think you might do a little better at 55 mph, I keep mine at 60 just for safety.. I have simulated engine failures at 60 MPH in my kolb, the climb is so steep that it takes darn near a 0 G pushover to keep from stalling, and that is when I am expecting it ! I think a surprise failure at anything less than 60 MPH in climb would be extremely difficult.
Mike
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_________________
"NO FEAR" - If you have no fear you did not go as fast as you could have !!!
Kolb MK-III Xtra, 912-S |
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slyck(at)frontiernet.net
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| Posted: Tue Nov 11, 2008 7:03 pm Post subject: MK III Climb performance with Rotax 503 update 11-10-08 |
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There's the key. Can't stall at zero G. I don't care what your
attitude is.
Sure would help though to have enough wind passing the controls to do
something helpful.
I have climbed out with secure authority at 45 mph( ASI accuracy
questionable) in my clip wing MkIII
with one notch flaps. Sure amazes me. I would expect a mush sooner
but the ASI kept creeping up
so why argue?
If I were younger and had more horsepower I would go out and test the
extremes of vertical reverse
and unusual attitudes. But I'm not. So far the Kolb has been a
solid and reliable ride through several
questionable situations.
BB
On 11, Nov 2008, at 9:38 PM, JetPilot wrote:
| Quote: |
I think those rates are great for a 503 on a MK III, it is more
than I would have expected. Rough air can hurt climb rates, I
would take the readings in perfectly smooth air. Also wind
gradients can affect climb rate, If you run into more head wind you
can have spikes...
I think you might do a little better at 55 mph, I keep mine at 60
just for safety.. I have simulated engine failures at 60 MPH in
my kolb, the climb is so steep that it takes darn near a 0 G
pushover to keep from stalling, and that is when I am expecting
it ! I think a surprise failure at anything less than 60 MPH in
climb would be extremely difficult.
Mike
--------
"NO FEAR" - If you have no fear you did not go as fast
as you could have !!!
Kolb MK-III Xtra, 912-S
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 13610#213610
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aoldman(at)xtra.co.nz
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| Posted: Wed Nov 12, 2008 3:59 am Post subject: MK III Climb performance with Rotax 503 update 11-10-08 |
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I climb at 55mph, 1 up and 60 two up with a MK111 503. simulated engine outs
would indicate these speeds to be OK.
That is flying off a field at 80ft msl. Not in a Kolb but I lost a gear box
drive with a Truster powered by a 503 at 350 ft at about 55 mph and the
recovery and landing were all sort of uneventfull { just a high heart
rate }The truster was a very high drag aircraft. Engine out landings were
almost a auto rotate decent and if you added some side slip you could almost
come straight down.
Regards
Tony
Down under
MK111 c 503
---
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David Lucas
Joined: 10 Jan 2006
Posts: 79
Location: Europe. based Amsterdam NL
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| Posted: Wed Nov 12, 2008 5:40 am Post subject: Re: MK III Climb performance with Rotax 503 update 11-10-08 |
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| Quote: | There's the key. Can't stall at zero G. I don't care what your
attitude is.
Sure would help though to have enough wind passing the controls to do
something helpful. |
Can remember watching a video of unusual attitude recovery training and using the DC-10 recovering from a very high nose attitude / low airspeed upset scenario as an example, they had sufficient roll, pitch and yaw authority to recover to straight and level flight starting at 80 Kts ! Yes 80 Kts . . . and that was because despite the high nose attitude, with less than 1 G pitch loading, they were NOT stalled and therefore had aerodynamic control available.
They lowered the nose with rudder input, not elevator, keeping at or about zero G pitch loading. That produced about a 75 degrees left wing low roll attitude, like a wing over maneuver, then as the nose fell below the horizon started rolling it level with aileron to a nose low, wings level attitude, then as it started to accelerate gradually introduced elevator pressure to recover to straight and level.
So the DC-10 was under full, if somewhat sluggish, aerodynamic control starting at 80 Kts. Very impressive !
David.
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