The Murphy Builders Site

My SG-3 and SG-4 top and bottom plates that react the spring gear inboard
bolt loads are 1.50 wide X 4.82 long. It looks like they should be about
5.20 long to completely span accross the square tubes. Looks suspiciously
like Murphy forgot to add the thickness of the two 0.20 thick FUS-424's
Gussets when they calculated the length? But maybe not. Seems there have
been some in service problems in this area. Am I missing something? Are my
parts not manufactured correctly? Or do the plates not span the width of
the tubes for a reason.

- Chuck Skorupa -
Elite SN 500



-----------------------------------------------------------------
List archives located at: https://mail.dcsol.com/login
username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
-----------------------------------------------------------------

In a message dated 11/15/2002 7:57:35 PM Pacific Standard Time, c_skorupa@hotmail.com writes:

My SG-3 and SG-4 top and bottom plates that react the spring gear inboard
bolt loads are 1.50 wide X 4.82 long. It looks like they should be about
5.20 long to completely span accross the square tubes.

I also have the short length (4. sg-3 sg-4 plates that came with R-254.
This length is about where the curve starts on the square tubes. Maybe the curve supports the plates so it doesn't have to be full wide of both tubes. I do see your point and I think I would have made them a little longer, but it does save a little weight.
Good luck
Jim R254
Wishing I wouldn't have paid the big bucks for Spring Gear.

-----------------------------------------------------------------
List archives located at: https://mail.dcsol.com/login
username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
-----------------------------------------------------------------

Hi Jim and Chuck,

The newer kits now have these plates extend past the curved inside corners and cover the whole tube. The newer kits also have a 2 inch angle that sets over the forward tube and requires even longer bolts. I have spring gear that was purchased in 94 on 357R and the plates where short and installed this way by the previous builder. I did incorporate the 2 inch angles and after 20 hours have not experienced any problems operating off a dirt strip. I keep a close eye on this part of the fuselage, however, to detect any deformation.

Bruce 357R

-----------------------------------------------------------------
List archives located at: https://mail.dcsol.com/login
username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
-----------------------------------------------------------------