KR> projector for the Gathering?

[bernard wunder]

Mark wrote:

>>Anybody have access to a projector that can be used to project computer
presentations at the Gathering?  

I have a projector and laptop that I was going to bring - we used it at the
last Gathering.

r/Bernie
Lusby, MD
KR2s Builder

KR> Grove gear

[Bernard Wunder]

On Mon, 3 Jan 2005 22:45:17 -0500
  "Brian Kraut"  wrote:

> Anyone out there that has seen both the Rand and Grove 
>
  I don't know of any other installation
>pictures of the Grove or
> Rand gear anywhere.  Can anyone point me to some more?
> 

Brian,
I have the Grove two-piece gear.  The brackets from Grove 
are around $200, but if you have the newer wing airfoil, 
the standard KR2 brackets won't work.  If you tell them in 
advance they will build the brackets to your specs.  I 
wound up putting on a backing plate.  There are some 
pictures on my web site.  Easy installation ( I did not 
say inexpensive). 
http://mywebpage.netscape.com/n2w6/landinggear.html
r/Bernie
Lexington Park, MD
KR2S Builder

KR> Grove gear

[Bernard Wunder]

On Tue, 4 Jan 2005 21:14:52 +0200
  "Stephen Jacobs"  wrote:

> What is the blue plug that is visible on edge of the 
>landing gear leg?
> 

For $100 extra Grove will drill the brake hydraulic 
line/passageway (gundrill) through the gear legs...makes 
for a neat setup. The blue plug is the to cap off the 
passageway.  My main concern was to not put a bolt thru 
the drilled out passageway.
r/Bernie
Lexington Park, MD
KR2S Builder

KR> spar skins

[Bernard Wunder]

I thought you were an electrical engineer :)


On Thu, 1 Jul 2004 09:21:24 -0400
  "Wood, Sidney M."  wrote:
>No one has mentioned the 5/8" vertical spruce blocks that 
>the plans call for when building KR spars.  The spars are 
>a variant of an I-beam.  The function of the web in any I 
>beam or box beam is to keep the two caps from coming 
>together.  No matter what loading is put on the beam - 
>plus or minus g's, or twisting, and any combination of 
>these forces - the caps will tend to come closer 
>together.  Beam failure will be either crushing the cap 
>that is under compression, breaking of the cap under 
>tension, or crush of the web followed immediately by 
>buckling or crush of the compression cap.  Metal tends to 
>buckle; wood tends to crush.  The theory and practice is 
>to always have the caps either in compression or tension, 
>never in bending.  The lumber is much stronger in tension 
>or compression and poor in bending.  The 3/32 plywood, 
>used for a web, will always be subject to compression and 
>is strongest along the length of the grain (as Don Ried 
>cites).  Plywood has an odd number of plies with outside 
>plies in the same grain orientation.  That is the 
>strongest dimension orientation.  The KR box beam 
>construction is probably way over-built at 21 g failure. 
> So, you could put the plywood on in any random 
>orientation and probably still have a 6-g airplane.  For 
>the exact same weight would you prefer a 21-g wing or 
>something less?  Ken Rand and Stu Robinson got it right.
>Sid Wood, Tri-gear KR-2 N6242
>Mechanicsville, MD USA
>sidney.w...@titan.com
>
>
>And having said that, here's one from Don Reid where he 
>advocates running
>the grain horizontal, rather than vertical.  I'd trust 
>just about anything
>Don says as gospel.
>--
>Date: Jul 20, 1999 8:27 AM
>
>From: Donald Reid 
>
>Subject: Re: Grain direction.who cares it's 
>plywood...my turn at a
>'STUPID' Question
>
>
>Tim wrote:
>
>> Like Aircraft Plywood is either 90 or 45 degrees, I 
>>assume this is how
>> the ply's (3-7) are layered. So grain direction of the 
>>top sheet is of
>> interest, but I wouldn't think the orintation is as 
>>critical in dealing
>> with the Spar web as perhaps Aluminium .
>
>OK, here are some numbers.  Anyone who is interested can 
>make up their
>own mind.  All data are for birch plywood and taken from 
>ANC-18, Design
>of Wooden Aircraft Structures. (The thick pieces are 
>included just to
>show the effect with more plys)
>
>thickness   # plysparallel   perpendicular
>0.125" 3   15.17 5.544
>0.160" 5   21.46 11.47
>0.410" 7   131.1 80.91
>
>All plys are equal thickness.  The numbers are moment for 
>fiber stress
>at the proportional limit in units of inch-pounds per 
>inch of width.
>
>As to why the KR plans specify a vertical orientation, it 
>is because Ken
>Rand and Stu Robinson got it wrong.
>---
>Mark Langford, Huntsville, AL
>N56ML at hiwaay.net
>see KR2S project N56ML at 
>http://home.hiwaay.net/~langford
>
>
>
>
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