Today's Message Index:
----------------------
1. 05:10 AM - Re: Float geometry (Peter C)
2. 11:04 AM - float geometry (Peter C)
3. 11:12 AM - Re: float rigging (Noel Loveys)
4. 11:22 AM - Re: Float geometry (Noel Loveys)
5. 01:09 PM - Re: Float geometry (Peter C)
6. 07:05 PM - Re: Float geometry (Noel Loveys)
Message 1
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| Subject: | Re: Float geometry |
Hagen, that is a very interesting requirement about the distance of the
step behind the cg. Haven't heard it before.
A fellow in Australia sent me an interesting article by Frey who was at
Edo years ago. It brought out some concepts about step position. Will
get this stuff together soon.
Peter
Message 2
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Hagen, any chance you could get some background on the reasons for that
step position. It is a little different from other rules I've heard.
Peter
Message 3
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The nice thing about having the fuselage sitting pretty high above the
float
is the ability to use longer props without having to worry too much
about
water abrasion. As with everything else there is a limit of diminishing
returns.
Noel
-----Original Message-----
From: owner-seaplane-list-server@matronics.com
[mailto:owner-seaplane-list-server@matronics.com] On Behalf Of Peter C
Sent: Sunday, June 03, 2007 4:20 PM
Subject: Seaplane-List: float rigging
Joel I haven't finished the geometry write up but will soon.
The main numbers that seem to work are fuselage datum or centerline
inclined
aout 3 degrees to float and step at or a little aft of the most rearward
cg.
There is a wide range of float stances and height above the float. If
you
already have the spreader bars then you will probably go with that. The
Murphy rebel sits 31.5 above the float; one guy dropped that to 29; mine
are
at 24; many other Rans at 20 and the first one I had on Full Lotus was
maybe16 or 18 (too squat looking. The dual water rudders on these
Murphys
are the best, shortest diameter turning I've ever had and so I would try
to
go with two rudders.
Want some of my parts or strut material?
Peter
Message 4
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Hagen:
I take it the 4" for the step is also a minimum to help prevent porpoising
on take off.
Noel
> -----Original Message-----
> From: owner-seaplane-list-server@matronics.com
> [mailto:owner-seaplane-list-server@matronics.com] On Behalf
> Of Hagen Heckel
> Sent: Monday, June 04, 2007 5:15 AM
> To: seaplane-list@matronics.com
> Subject: Seaplane-List: Float geometry
>
>
> <mail@hagenheckel.de>
>
> Hi Joel,
>
> in addition to Peter's infos:
>
> Our regulations for UL's here in Germany (sould be similar
> with the FAA)
> require the step to be 100 mm (4 inch) aft of the most aft
> C.G. and the prop
> tip min. 300 mm (12 inch) above the water surface on MTOW.
>
> Regards
> Hagen
>
>
>
Message 5
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| Subject: | Re: Float geometry |
MessageNoel, where have you been hiding? Haven't heard from you in a
long time.
I've started to post some of my float geometry stuff. can link to it
from:
http://www.pipcom.com/~cowcam/floatrig.htm
More to come. You may be upset because I'm not going to deal with your C
of B calc method.
Peter
----- Original Message -----
From: Noel Loveys
To: seaplane-list@matronics.com
Sent: Tuesday, June 05, 2007 2:21 PM
Subject: RE: Seaplane-List: Float geometry
Hagen:
I take it the 4" for the step is also a minimum to help prevent
porpoising on take off.
Noel
> -----Original Message-----
> From: owner-seaplane-list-server@matronics.com
> [mailto:owner-seaplane-list-server@matronics.com] On Behalf
> Of Hagen Heckel
> Sent: Monday, June 04, 2007 5:15 AM
> To: seaplane-list@matronics.com
> Subject: Seaplane-List: Float geometry
>
>
> <mail@hagenheckel.de>
>
> Hi Joel,
>
> in addition to Peter's infos:
>
> Our regulations for UL's here in Germany (sould be similar
> with the FAA)
> require the step to be 100 mm (4 inch) aft of the most aft
> C.G. and the prop
> tip min. 300 mm (12 inch) above the water surface on MTOW.
>
> Regards
> Hagen
>
> ==========
> Seaplane-List http://www.matronics.com/Navigator?Seaplane-List
> ==========
> bsp; available
href="http://forums.matronics.com">http://forums.matronics.com
> ==========
>
>
>
>
Message 6
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The CG method is just one method... nothing to get upset over. I was
quite
impressed with your practical approach on your web site. I'm interested
in
seeing your geometry calculations.
The CG 4" in front of the step is an interesting piece of legislation
but I
can see if it is a minimum how it would help keep a plane on step from
rocking too much.
Property taxes then Insurance..... rain tomorrow... maybe I'll get it
all
straightened out then.
Noel
-----Original Message-----
From: owner-seaplane-list-server@matronics.com
[mailto:owner-seaplane-list-server@matronics.com] On Behalf Of Peter C
Sent: Tuesday, June 05, 2007 5:38 PM
Subject: Re: Seaplane-List: Float geometry
Noel, where have you been hiding? Haven't heard from you in a long time.
I've started to post some of my float geometry stuff. can link to it
from:
http://www.pipcom.com/~cowcam/floatrig.htm
More to come. You may be upset because I'm not going to deal with your C
of
B calc method.
Peter
----- Original Message -----
From: Noel <mailto:noelloveys@yahoo.ca> Loveys
Sent: Tuesday, June 05, 2007 2:21 PM
Subject: RE: Seaplane-List: Float geometry
Hagen:
I take it the 4" for the step is also a minimum to help prevent
porpoising
on take off.
Noel
> -----Original Message-----
> From: owner-seaplane-list-server@matronics.com
> [mailto:owner-seaplane-list-server@matronics.com] On Behalf
> Of Hagen Heckel
> Sent: Monday, June 04, 2007 5:15 AM
> To: seaplane-list@matronics.com
> Subject: Seaplane-List: Float geometry
>
>
> <mail@hagenheckel.de>
>
> Hi Joel,
>
> in addition to Peter's infos:
>
> Our regulations for UL's here in Germany (sould be similar
> with the FAA)
> require the step to be 100 mm (4 inch) aft of the most aft
> C.G. and the prop
> tip min. 300 mm (12 inch) above the water surface on MTOW.
>
> Regards
> Hagen
>
> ==========
> Seaplane-List http://www.matronics.com/Navigator?Seaplane-List
> ==========
> bsp; available
href="http://forums.matronics.com">http://forums.matronics.com
> ==========
>
>
>
href="http://www.matronics.com/Navigator?Seaplane-List">http://www.matr
onics
.com/Navigator?Seaplane-List
href="http://forums.matronics.com">http://forums.matronics.com
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