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d-m-hague(at)comcast.net
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 Posted: Wed Sep 19, 2007 3:57 am Post subject: Ultrastar questions |
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Three questions for the Ultrastar gurus as I get closer to getting my plane ready:
In level flight, I assume the boom tube (unlike the low boom Kolbs) is approximately horizontal? I ask this because I'm going to redo the pitot tube from the original owner's hokey arrangement, and I want to get it angled right, and also get the compass (I know an US doesn't really need one but I have an extra laying around) level.
The hole for the lower clevis pin that operates the elevators (goes through both elevator horns with the actuator arm in the middle) seems to be too low, so that it hits the tube that runs underneath, preventing the elevators from going all the way down. Somebody drilled a new hole about 1" farther up, and that's where the bolt (which they used instead of the original clevis pin) went through. It works that way, but I'm concerned that there is a little loss of precision, and more importantly, strength... though I doubt the loads are all that high). Thoughts?
I replaced the lower tail wires as they were kinked (uppers were OK). Everything is in good alignment, but I'm unclear how tight they should be. On my T-Craft, the book said to strum them and get a "low bass tone"... what about the US?
-Dana
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I started out with nothing. I still have most of it left. [quote][b]
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bill.rayfield(at)optilogi
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| Posted: Wed Sep 19, 2007 9:19 am Post subject: Ultrastar questions |
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I'm not guru by any means!
But, I do remember in the weight and balance section of the US manual, it says to set the tail up so the boom tube is angled down approximately 10 degrees - this is the flight attitude.
I remember because we screwed up twice by making it perfectly level and it just won't work out that way....
Hope this helps
Billyray in GA
From: owner-kolb-list-server(at)matronics.com [mailto:owner-kolb-list-server(at)matronics.com] On Behalf Of Dana Hague
Sent: Wednesday, September 19, 2007 7:56 AM
To: kolb-list(at)matronics.com; KolbUltrastar(at)yahoogroups.com
Subject: Ultrastar questions
Three questions for the Ultrastar gurus as I get closer to getting my plane ready:
In level flight, I assume the boom tube (unlike the low boom Kolbs) is approximately horizontal? I ask this because I'm going to redo the pitot tube from the original owner's hokey arrangement, and I want to get it angled right, and also get the compass (I know an US doesn't really need one but I have an extra laying around) level.
The hole for the lower clevis pin that operates the elevators (goes through both elevator horns with the actuator arm in the middle) seems to be too low, so that it hits the tube that runs underneath, preventing the elevators from going all the way down. Somebody drilled a new hole about 1" farther up, and that's where the bolt (which they used instead of the original clevis pin) went through. It works that way, but I'm concerned that there is a little loss of precision, and more importantly, strength... though I doubt the loads are all that high). Thoughts?
I replaced the lower tail wires as they were kinked (uppers were OK). Everything is in good alignment, but I'm unclear how tight they should be. On my T-Craft, the book said to strum them and get a "low bass tone"... what about the US?
-Dana
--
--
I started out with nothing. I still have most of it left. [quote]
href="http://www.matronics.com/Navigator?Kolb-List">http://www.matronics.com/Navigator?Kolb-List
href="http://forums.matronics.com">http://forums.matronics.com
[b]
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d-m-hague(at)comcast.net
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| Posted: Wed Sep 19, 2007 5:38 pm Post subject: Ultrastar questions |
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At 01:20 PM 9/19/2007, Bill Rayfield wrote:
| Quote: | I'm not guru by any means!
But, I do remember in the weight and balance section of the US manual, it says to set the tail up so the boom tube is angled down approximately 10 degrees - this is the flight attitude.
I remember because we screwed up twice by making it perfectly level and it just won't work out that way.... |
Hmm, that doesn't seem right. I know the manual says to balance it that way, but it doesn't say it's the flight attitude. It may just be that a properly balanced plane hangs that way when you hang it from a rope as they suggest.
The wing is at 3° angle of incidence relative to the boom tube. If the boom tube was at 10° in level flight that'd be a 13° AOA, perilously close to stall. I figure I'll set the pitot parallel to the boom tube for the first flight and see how it goes.
Still on track for this weekend... got the tail rigged, new primary hardware, and new fuel system components. Had a bit of a scare when the wing universal fittings (which I inspected REAL closely since I once set the wingtips on the ground without disconnecting the rear connection first before I knew better) appeared cracked, but it turned out to be just the paint... the guy who recovered it left them on when he painted it, and I guess poly-spray and poly-tone isn't a great finish for metal. After scraping it down to the primer they looked fine. All that's left now is the pitot and bleeding the brakes.
-Dana
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Friends help you move. *Real* friends help you move bodies. [quote][b]
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