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travis(at)tnkolbaircraft.
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 Posted: Mon Mar 24, 2008 10:21 am Post subject: MKIII X |
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Mike W:
I am a Kolb man. No experience in any other ULs and very little in a 152, just enough to get a private ticket after I retired from the Army.
Unlike the Kolb, the MX engine is mounted inverted beneath the wing. The thrust line is below the wing, not well above the wing like our Kolbs. I am sure there is a big difference in handling and flight characteristics, opposite thrust lines.
Every Kolb I have flown has had to be tuned up and tweaked to get it to fly like the builder/flyer wants it to. I don't know of anyone with the capability of most of us, working in basements, garages, and living rooms, could build something as sophisticated at an airplane and get it to fly 100% right out of the box.
If you can iron out all the bugs before the first flight, you are a better man than me. 
Most Kolbs hit an invisible wall, after which no amount of power is going to make enough difference to make them into a Glasair. I have accepted my mkIII is an 85 mph airplane. Have been able to cover great distances with it and still get back home. If I had been flying all those hours and miles with a 300 mph airplane, there are times I would have been bored in it the same as I get, at times, in my mkIII flying over long, boring, uncomfortable wind condition places. However, when the terrain and the flying get exciting again, I rarely thing of how fast I am flying across the ground.
Take care,
john h
mkIII
Labhart Field, KY
[quote] I am aware of the nose down tendency of the raised rear engine mount. Although my experience with
this tendency is very faded. It has been a few years since I was training to fly a Quicksilver MXII, w/582.
Something still seems to be a little off regarding Mike B's plane. 85 mph top speed, with the 912S, strikes me
he has something out of whack. Wing settings, prop pitch, something.
These are all the bugs I want ironed out of my plane prior to the first flight!!! I assume nothing!!
Mike Welch
[b]
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Possums
Joined: 03 Nov 2007
Posts: 247
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| Posted: Mon Mar 24, 2008 10:49 am Post subject: MKIII X |
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At 12:55 PM 3/24/2008, you wrote:
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Possum,
Are you going to mention what aircraft those tips are on ; )
Fly Safe,
Wade
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They're on mine - not to mention some others around the farm.
You didn't want me to mention that did you?
Now what is all this talk about "Seafoam" and how does
that stuff work??
Do not archive
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_________________
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beauford173(at)verizon.ne
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| Posted: Mon Mar 24, 2008 11:50 am Post subject: MKIII X |
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---
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airspeedx3(at)yahoo.com
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| Posted: Mon Mar 24, 2008 11:53 am Post subject: MKIII X |
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John H.
A minor point of clarification....the MXII I was training in was a top mount 582. You are correct, in that most Quicks were inverted, but I wasn't clear to mention I meant a "top mounted" version. (see photo) And my experience level is was/still is beginner to novice. I think I had about 12-15 hours, total, prior to deciding to get my regular private pilot license.
I know the top mounted style aircraft exerts a downward push on the nose, I just don't recall how much. (I flew the Quicks as a trainee back in 1993-1994, and never soloed)
I doubt very seriously if I get my MkIII correct, right out of the box(es). I most certainly want to al least get it close. I made a terrible assumption, once before, about flying ultralights. Very bad results. I'd like to think I no longer assume anything. Verification and assurance of facts, IMO, is a good route.
My flying experience is also quite limited. Trained in a C-150, got about 15 hours of
misc. training in the MXII's, bought my first C-172, sold it to build this MkIII, bought my present C-172, and it's for sale (Trade a Plane). Maybe a total of about 600 hours. I have enough experience to know I need to be instucted in a Kolb prior to flying one!!
The reason for the sale of my Cessna is that I believe my finished MkIII will be all the airplane I will need. My intention isn't to really make it "scream along", just fly within it's
expected, and properly tuned parameters.
BFN, Mike W
"Travis Brown (Kolb Aircraft)" <travis(at)tnkolbaircraft.com> wrote:
[quote] .hmmessage P { PADDING-RIGHT: 0px; PADDING-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-TOP: 0px } BODY.hmmessage { FONT-SIZE: 10pt; FONT-FAMILY: Tahoma } Mike W:
I am a Kolb man. No experience in any other ULs and very little in a 152, just enough to get a private ticket after I retired from the Army.
Unlike the Kolb, the MX engine is mounted inverted beneath the wing. The thrust line is below the wing, not well above the wing like our Kolbs. I am sure there is a big difference in handling and flight characteristics, opposite thrust lines.
Every Kolb I have flown has had to be tuned up and tweaked to get it to fly like the builder/flyer wants it to. I don't know of anyone with the capability of most of us, working in basements, garages, and living rooms, could build something as sophisticated at an airplane and get it to fly 100% right out of the box.
If you can iron out all the bugs before the first flight, you are a better man than me.
Most Kolbs hit an invisible wall, after which no amount of power is going to make enough difference to make them into a Glasair. I have accepted my mkIII is an 85 mph airplane. Have been able to cover great distances with it and still get back home. If I had been flying all those hours and miles with a 300 mph airplane, there are times I would have been bored in it the same as I get, at times, in my mkIII flying over long, boring, uncomfortable wind condition places. However, when the terrain and the flying get exciting again, I rarely thing of how fast I am flying across the ground.
Take care,
john h
mkIII
Labhart Field, KY
[quote] I am aware of the nose down tendency of the raised rear engine mount. Although my experience with
this tendency is very faded. It has been a few years since I was training to fly a Quicksilver MXII,
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Dana
Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA
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| Posted: Mon Mar 24, 2008 1:56 pm Post subject: MKIII X |
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At 02:33 PM 3/24/2008, John Hauck wrote:
| Quote: | | Unlike the Kolb, the MX engine is mounted inverted beneath the wing. The thrust line is below the wing, not well above the wing like our Kolbs. I am sure there is a big difference in handling and flight characteristics, opposite thrust lines. |
Every Quicksilver I've flown had the engine above the wing. Some have had a bottom mounted engine, but in either case, the thrust line is very close to the wing. Not as high as a Kolb (except, of course, an Ultrastar), but a Quick is also kinda strung out vertically, so there's a lot of drag down low. There is significant pitch trim change with power.
-Dana
--
Work is underway on drafting a new constitution for Iraq. Why don't we send them ours? It worked for 200 years, and we don't use it any more. [quote][b]
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JetPilot
Joined: 10 Jan 2006
Posts: 1246
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| Posted: Tue Mar 25, 2008 6:30 am Post subject: Re: MKIII X |
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My MK III Xtra has the new Steel gear, and the center wing bolts are drilled through the top of the wing center section tabs just as they should be to minimize the angle that the large wedge of the fuselage hits the airstream. I notice the pitch changes with power, but its easy to deal with, pitch control in my MK III is light and effective.
The downward trim is not due to the engine mounting and high thrust, because it was trimmed to far down even at idle power, moving the horizontal stab and trim tabs are what it took to fix it. At first I just used trim tabs to correct the nose down tendency, but when I looked back, I could see that all the load was on the elevator and almost none on the Horizontal stab by the way the fabric was being pushed down. See the attached picture, this is my tail with only trim tabs, but the stab in stock position, two people, near max gross weight.
The Xtra did great at 90 MPH, I did not even realize it was going fast until I looked at the airspeed indicator. I have never seen any indication of the front window being pushed in, not even at 90 MPH.
Mike
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| Look at Fabric, all the load is being place on the elevator. |
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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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