The Murphy Builders Site

Hi Don,
I've also heard them called seafins.
Al
----- Original Message -----
From: "Don Boardman" <dboardm3@twcny.rr.com>
To: <murphy-rebel@dcsol.com>
Sent: Monday, January 12, 2004 8:12 PM
Subject: Moose Finlett Design

Hi Bruce & All,

Finletts, I like that name. Is that what they are really called?

As Al mentions, reports I have heard indicate the Moose on floats
experiences significant adverse yaw.

Randy and I will be installing the ventral fin supplied by Keith at

Montana

Floats. We will also be installing "finletts". From the pictures I have

seen

of Beavers the fins seem to start at or slightly forward of the

horizontal's

leading edge. On the Moose the front edge of the fin starts back from the
leading edge because of the location of the available slot between the
horizontal and the elevator.

Randy and I have pondered a finletts design that would start some distance
in front of the horizontal's leading edge and continue back as per the
present design. Our goal is to maximize the vertical area and therefore
hopefully the stabilizing effect that the Moose seems to favor.

Comments Welcome.

Regards,
Don Boardman
& Partner, Randy Bowers
Super Moose #130 M-14PF 400HP, MT-prop/beta, Aerocet 3500 amphibs, Rome,

NY
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Hi Bruce & All,

Finletts, I like that name. Is that what they are really called?

As Al mentions, reports I have heard indicate the Moose on floats
experiences significant adverse yaw.

Randy and I will be installing the ventral fin supplied by Keith at Montana
Floats. We will also be installing "finletts". From the pictures I have seen
of Beavers the fins seem to start at or slightly forward of the horizontal's
leading edge. On the Moose the front edge of the fin starts back from the
leading edge because of the location of the available slot between the
horizontal and the elevator.

Randy and I have pondered a finletts design that would start some distance
in front of the horizontal's leading edge and continue back as per the
present design. Our goal is to maximize the vertical area and therefore
hopefully the stabilizing effect that the Moose seems to favor.

Comments Welcome.

Regards,
Don Boardman
& Partner, Randy Bowers
Super Moose #130 M-14PF 400HP, MT-prop/beta, Aerocet 3500 amphibs, Rome, NY








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The forward wrap around of the leading edge for the finlet is what I have
had envisioned, before MAM even put a set onto theirs, similar to what you
might find on a Pilatus (like the ones in Air America movie).

The problem with trying to install these is that once in place you would be
unable to get the elevator back off for removal of the stab etc. They will
have to be made in two pieces per side to allow installation/removal around
the extended leading edge of the stab. Where as the MAM style if you get the
nut plates in the right place can be removed and slid out of postion to
permit removal of the stab (it won't go back through that rectangle under
the fin with the finlets on!!).

Cheers,
Wayne

----- Original Message -----
From: "Don Boardman" <dboardm3@twcny.rr.com>
To: <murphy-rebel@dcsol.com>
Sent: Monday, January 12, 2004 11:12 PM
Subject: Moose Finlett Design

Hi Bruce & All,

Finletts, I like that name. Is that what they are really called?

As Al mentions, reports I have heard indicate the Moose on floats
experiences significant adverse yaw.

Randy and I will be installing the ventral fin supplied by Keith at

Montana

Floats. We will also be installing "finletts". From the pictures I have

seen

of Beavers the fins seem to start at or slightly forward of the

horizontal's

leading edge. On the Moose the front edge of the fin starts back from the
leading edge because of the location of the available slot between the
horizontal and the elevator.

Randy and I have pondered a finletts design that would start some distance
in front of the horizontal's leading edge and continue back as per the
present design. Our goal is to maximize the vertical area and therefore
hopefully the stabilizing effect that the Moose seems to favor.

Comments Welcome.

Regards,
Don Boardman
& Partner, Randy Bowers
Super Moose #130 M-14PF 400HP, MT-prop/beta, Aerocet 3500 amphibs, Rome,

NY
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