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Ramp geometry - Landing gear design

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BenoitLescot

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Joined
Jan 13, 2010
Messages
80
Location
Provence, France
Hi there,

Am working on the landing gear for my project, I was having a thought about the ramp geometry, basically I want my gear to be as low as possible for obvious weight reasons, but one specific about flying-boats is when pulling up the ramp, a picture better than 1000 words so here is what I'm worried about :


Is that likely to be a problem or are the ramps out there offer very smooth transitions ? what is the typical ramp angle ?

thanks all !
 

BenoitLescot

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Joined
Jan 13, 2010
Messages
80
Location
Provence, France
Good, at the moment, I can accomodate 25° which has to be more than enough.. can't imagine going up a 25° ramp anyway, which is also above the 15° tipback angle.. interesting, then I suppose flying-boats must have a few extra tipback angle degrees (i.e. wheels further aft) to be able to climb up the ramp without going on the tail..

thanks autoreply !
 
Last edited:

Kristoffon

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Joined
Sep 4, 2009
Messages
348
Location
Brazil
Pretty much every boat ramp I've seen has a rounded top, negating your concern.

It would pay off for you to survey a few ramps you might want to climb and measure both their inclination and roundedness.
 

BenoitLescot

Well-Known Member
Joined
Jan 13, 2010
Messages
80
Location
Provence, France
Thanks, maybe in my next life I'll have some spare time for that ;) I'll keep a note though

Seriously, wouldn't that be part of the VFR aerodrome charts ?
 

Dan Thomas

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Joined
Sep 17, 2008
Messages
5,409
Are you going to have an airplane that sits so low that it can't effectively rotate for liftoff or flare for landing?

Dan
 

BenoitLescot

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Joined
Jan 13, 2010
Messages
80
Location
Provence, France
why would I do that ? I was just trying to shed some light on a gray part of my knowledge of seaplanes operations, now come to think of it, floats, as in floats mounted on a seaplane not flying-boat, most definitely have a keel way lower than the keel of a flying-boat, so keel height between the wheels shouldn't be a problem for my current design
 
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