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Chris In Marshfield
Joined: 26 May 2006
Posts: 87
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 Posted: Fri Aug 18, 2006 5:51 am Post subject: Vertical stab variations |
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Good morning all,
Looking through a number of photos of completed Meese, I noticed a pretty significant difference in almost all of the vertical stabs, or at least the fairings leading up to them. Some were really quite tall, while others not. Why the variation? What benefits are realized by a larger surface area here?
I'm reading the current price list and in the available options I see a dorsal fin kit (which I presume is the fairing ahead of the vertical stab), a seafin kit (which I presume are the little wings I see on some horizontal stabs near the elevator hinges), and a ventral fin kit (which I presume goes beneath the vertical stab on the underside of the tail).
So, who among you are using a custom setup, and who has the one Murphy offers? Do I need to plan for some additional work here, or are all the parts there? I see that Scott did something custom here.
Are these parts replaceable/removable as the role of the aircraft changes (floats vs. wheels)?
Best regards,
Chris
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Chris Owens
Waunakee, WI |
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ScottA
Joined: 05 Jan 2006
Posts: 100
Location: Park City, UT
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| Posted: Fri Aug 18, 2006 7:29 am Post subject: Re: Vertical stab variations |
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If going not going on floats the standard fin fairing is fine, nothing else needed. It is the smallest one you see out there.
As you may already know on floats you need more vertical area to offset the yawing moments that can be produced by the floats sticking out in front of the CG. Without increased vertical stab area if you get a little yaw going the floats tend to increase the yaw and it feels bad.
Not sure what "dorsal" fin kit MAM is selling now but my guess it is the larger fiberglass one that you see on Mowat's Moose. (Email Nancy in shipping and see if she can send a picture?) A few of us (see Steve's and Ron's on my completion page) didn't like the look of that one (thought it didn't "flow" into the fin very well) so we copied the C-185 - and made it out of aluminum. The bottom ventral fin and stab sea fins are all just ways to increase the vertical area. Those are all removable, but generally the top fin fairing is not. Originally Montana Float came up with those on their installation.
Don't mean to try and be the shell answer man but stuck at the in-laws with bad wx and an internet connection...
Plus not much activity on this site, hopefully more Moose guys will find it and start using it.
Scott
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ScottA
Joined: 05 Jan 2006
Posts: 100
Location: Park City, UT
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| Posted: Fri Aug 18, 2006 7:35 am Post subject: Re: Vertical stab variations |
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The problem with using the forum to post - no auto spell and grammer checker.
Of course that first sentence was "If not going on floats.."
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Chris In Marshfield
Joined: 26 May 2006
Posts: 87
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| Posted: Fri Aug 18, 2006 10:13 am Post subject: Re: Vertical stab variations |
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Hehe... spell checker... good one 
I certainly appreciate your time, Mr. Answer Man. The more info out there, the better. I, too, am glad my in-laws have an Internet conneciton, for the very same reasons. I figure if I've got these seemingly odd questions, someone else has probably thought about them, too. Hopefully, we can build up a reasonable knowledge base here. I've already learned a lot
I don't know a thing about seaplanes (other than I think I need one!), so I'm happy for any info I get. Especially since nobody seems to be using the seaplane forums. I never thought about the floats being ahead of the CG, but it makes sense. The vertical stab area makes perfect sense now.
Appreciate the insight.
Best regards,
Chris
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Chris Owens
Waunakee, WI |
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Chris In Marshfield
Joined: 26 May 2006
Posts: 87
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| Posted: Fri Aug 18, 2006 10:17 am Post subject: Re: Vertical stab variations |
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Does the larger vertical stab area negatively affect aircraft performance when on wheels? Seems like more sail area if landing in a crosswind. I've never flown in a tailwheel aircraft, and I've got kind of a fear of the dreaded ground loop I keep hearing about. I was out on Controller.com last night looking at C-175s and C-185s and many of them had damage history from ground loops, although they claim to have been repaired.
Best regards,
Chris
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Chris Owens
Waunakee, WI |
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