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Model Forum / Radio Controlled / Air Models / September 2006



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Landing Gear Size Question

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Harry Sanchez - 21 Nov 2005 00:36 GMT
Good Evening.  I am starting to build a kit plane I purchased recently.  
It is a high-wing sport model, which includes wire wheel struts for the
main landing gear.  This type of landing gear has been wobbly on some of
my earlier planes, resulting in poor ground handling.  I am considering
using instead a plate type landing gear.  I have heard that the width
between the wheels of a landing gear should be about 25 percent of the
wingspan, to prevent the plane from tipping over.  Since the wingspan is
68 inches, this means I would have to have 17 inches between the
wheels.  Two questions:
    1.  Is the 25 percent rule correct?
    2.  Does anyone manufacture a landing gear with 17 inches between
wheels?
Any advice would be appreciated.

Very respectfully,
Harry Sanchez
hsanchez@jetlink.net
Robert  Scott - 21 Nov 2005 01:12 GMT
> Good Evening.  I am starting to build a kit plane I purchased recently.
> It is a high-wing sport model, which includes wire wheel struts for the
[quoted text clipped - 8 lines]
>     2.  Does anyone manufacture a landing gear with 17 inches between
> wheels?

Harry,

I just checked the gear measurements on three of my high-wing models.  One
is a tricycle gear model with an 80 1/2" wing span (non-scale).  The wheels
are 14 1/2" apart, center-to-center.  Another is a 72" span tail-dragger
(J-3 Cub).  The wheels are 12" apart.  The last is also a 72" span
tail-dragger (DHC-2 Beaver).  The wheels are 14" apart.  The first two are
ARFs and the third is built from a kit according to the plans.  All exhibit
normal ground handling and all have wheel seperations less than the 25% rule
you mention.

Good flying,
desmobob
asm_ - 19 Sep 2006 06:04 GMT
I know this a old thread, but I have found Magister from Multiplex seem
to follow the 25% rule and I have not been able to tip the plane withou
cross wind.  65" wing span and 17" wheel base.  

Does any one know where I can find after market landing gear that ha
17" wheel base and 3.5" to 4" in height?  The piano landing gear o
magister works fine, but I am a bit tire of them bending out of shap
after a "not so perfect landing"...

~as

--
asm
PCPhill - 19 Sep 2006 13:08 GMT
I've been flying my Magister for about 18 months and love it.  It's heavier
than your average trainer type plane, but very tough, and the extra weight
makes it easier to land without floating down the whole runway.  I'll
frequently use my whole pack just shooting touch and go's.

But as for your question.  You'll probably have to bend them yourself if you
want wire gear to fit.  If you want to install a hardwood block and mount CF
gear,  you should find something to work here:
http://www.graphtechrc.com/Secure/mall/maingear.asp

One thing to remeber though, it's better to bend and straighten the gear on
a bad landing than damage or rip out the mounting block.  A little give is a
good thing....

PCPhill

> I know this a old thread, but I have found Magister from Multiplex seems
> to follow the 25% rule and I have not been able to tip the plane without
[quoted text clipped - 6 lines]
>
> ~asm
 
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