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grantr
Joined: 12 Sep 2007
Posts: 217
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grantr
Joined: 12 Sep 2007
Posts: 217
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JetPilot
Joined: 10 Jan 2006
Posts: 1246
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 Posted: Sat Nov 01, 2008 9:52 am Post subject: Re: More Flying pictures |
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Hi GrantR,
Great pictures, I looked at the ones on Photobucket also ! What kind of performance do you get with 2 people on board ? I also notice your large trim tab on one aileron, are you aware that there is a way to adjust the incidence of the wings so that the trim tab will not be needed ? Given the angle of that trim tab, you might get a nicer flying airplane and a little better performance out of your kolb by fine tuning the incidence of the wings rather than trimming the ailerons that much. Kolb sells adjustable U joints for the rear attachment of the wings in which you can adjust the incidence with washers. I did this with my Kolb and it worked very well.
On the EGT's, 1200 is right on the upper edge, much higher and you will start seizing things in the engine  . You are correct to suspect the accuracy of the temperature readings, sometimes they can be way off. The big question is though, which was correct, the 900 or the 1200 degree readings ? Reading the plugs will help you diagnose this. I would suggest you call Lockwood aviation technical support, Kerry knows these engines very well and could give you some very good advice, and its a free call  One thing I found, pitching the prop a bit more so that you run a couple hundred less RPM's will result in a large reduction of EGT's.
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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grantr
Joined: 12 Sep 2007
Posts: 217
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| Posted: Sat Nov 01, 2008 6:42 pm Post subject: Re: More Flying pictures |
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Mike,
I don't know what the numbers are on the climb with 2 people on board. When i was taking lessons in my plane My instructor and I weighed in at about 325# together and the plane performed fine. We had a 3600 foot runway and we would be about 350 feet by the end of it. Takeoff roll was about 600 feet on asphalt. We also used the grass from time to time that was 2500 feet long and it was enough to clear 40 foot trees by a good margin. It climbs much better than a C 150.
Flying solo here at my home base I am using the grass along the runway and it is 950 feet long. The plane is up in about 400 feet on the rough grass. Landing is about the same with no brakes.
I use the whole runway and its a 6000 foot runway. I am at right around 950 when I pass the end of the runway. This is starting my climb shallow 65 IAS until about 100 agl and climbing 55 to 60 the rest of the time.
I wish I could find a cheap VSI just to see what the climb rate is.
My plane weights about 450# empty. Cruise rpm with 2 was 6K now solo its 53 to 5500 rpm.
I weigh 155# and I have 20# ballast flying solo.
The 503 on the MKIII seems to be a good match.
Thanks Mike No I didn't know about the adjustable U joints. I will look into that.
I think I have the egt issue resolved. I should have checked the jets 1st. the needle and the idler jet were the right size however The carbs had #145 main jets when it should have had #158s. I didn't have any jets on had so I drilled those out with a 1/16 drill bit and now egts are around 1100o. The engine is running just as good with the change. Spark plugs were not very brown from the last flight before the change. They were more of an off white color.
I personally like my 2 stokes to run on the slight rich side.
I put up some pictures of the egt reading from today on photobucket
http://s340.photobucket.com/albums/o353/grant31781/Engine/
I am going to try those vgs that you have and see how that changes things on my plane. She handles great now but if I can get it better why not try it!
Grant
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JetPilot
Joined: 10 Jan 2006
Posts: 1246
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| Posted: Wed Nov 05, 2008 7:35 pm Post subject: Re: More Flying pictures |
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Hi Grant,
Thats great news on your 503, your performance numbers are impressive for a MK III with that engine, being light makes a much bigger difference in Kolbs than I would have ever thought. I am surprised to see that you are flying with 20 pounds of ballast when alone, I weigh the same as you do and have never used ballast, but my empty weight is about 650 pounds empty, the 912-S is heavy and changes the way weight and balance works out quite a bit... I adjusted my elevator trim with fixed aerodynamic tabs so that my Kolb flys straight and level with me alone using no spring trim. I add spring trim in depending on the weight of the passenger, I have carried a 220 pound passenger and still have some trim range to spare.
One other thing that surprised me about the Kolb was how much flap rigging can affect roll trim, use great care to get each flap at exactly at the same angle to keep them from inducing a roll. In the end, I used a digital level to rig the flaps perfectly level with each other and used Kolbs adjustable Rear attachment brackets to adjust each wing at exactly same angle in relation to the fuselage. This resulted in a my airplane flying level with no trim tabs needed on the ailerons, I have trim tabs on my ailerons but they are neutral... My Kolb flys straight hands off and stays level in a stall. I am not home now, but I will post some pictures I took of the adjustable brackets from Kolb when I get back. I also have some cool videos I will edit and post as soon as I am get to my computer.
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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N111KX (Kip)
Joined: 27 Jan 2006
Posts: 96
Location: Atlanta, GA
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| Posted: Thu Nov 06, 2008 5:05 am Post subject: Re: More Flying pictures |
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Nice pics! It's interesting to note that this is the field where Charles Lindbergh soloed.... 
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Kip
Firestar II, N111KX
Waiex, N111YX
Quickie 1, N111QX
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