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Float geometry

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mail(at)hagenheckel.de
Guest

Posted: Sun Jun 03, 2007 11:46 pm Post subject: Float geometry

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

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peterc(at)pipcom.com
Guest

Posted: Tue Jun 05, 2007 4:10 am Post subject: 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

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peterc(at)pipcom.com
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Posted: Tue Jun 05, 2007 10:04 am Post subject: float geometry

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

   [quote][b]

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Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Tue Jun 05, 2007 10:22 am Post subject: Float geometry

Hagen:



I take it the 4" for the step is also  a minimum to help prevent porpoising on take  off.



Noel



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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

peterc(at)pipcom.com
Guest

Posted: Tue Jun 05, 2007 12:09 pm Post subject: 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

  

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Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Tue Jun 05, 2007 6:05 pm Post subject: Float geometry

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

  

  

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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

peterc(at)pipcom.com
Guest

Posted: Thu Jun 07, 2007 8:08 am Post subject: Float geometry

There is more material now on this subject. I'd  appreciate any feedback/criticsm.

 Peter

 http://www.pipcom.com/~cowcam/floatgeo.htm

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Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Thu Jun 07, 2007 5:43 pm Post subject: Float geometry

Nice lay out Peter.  I  never considered the height of the plane above the float to influence the  position of the CG of the plane on the floats but you are right it  does.   

  

 Keep it  coming!

  

  

Noel

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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

peterc(at)pipcom.com
Guest

Posted: Thu Jun 07, 2007 7:35 pm Post subject: Float geometry

Thanks Noel.

 Peter

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