On 6/7/2010 1:33 AM, bumper wrote:
On Jun 6, 10:46 pm, wrote:
You don't need Bumper to install the Mark IV...anyone can do it.

Simlpy drill a 1/2 inch hole in your canopy and place a 1/2 diameter
stove bolt in the hole. These are available on the aviation aisle at
Home Depot. Put a nylok type nut on it ...leave it loose for now. Wrap
the Mark IV around the bolt several times and secure it with a standard
stevadore's Fernortner Hitch. Now carefully torque the stove bolt to
4500 Foot Pounds. Don't over torque. Finally, mix up a batch of Shell
Epon 925 aviation epoxy and drizzle this goo on the bolt. Don't get the
epoxy on the string. If you do epoxy the string make sure it is lined up
on the longitudinal axis...you will feel a whole lot better about your
flying. Next place 4 pounds of lead in the tail to re-balance the
glider. Now get your log book out and log the install. Don't forget to
have the glider re-weighed to verify proper balance.

That's it. See, it's easy and I am sure that Bumper would approve of
this procedure.

Paul
ZZ

By posting your free DIY instructions for your heavy duty yaw string,
you've likey desimated 12 years of development and labor that's gone
into the, relatively speaking, delicate and frangible MKIV. How am I
supposed to compete with that? BTW, you forgot to mention your yaw
string mounting bolt should easily accept a Tost hook.This will
quickly become the accepted and preferred tow hook position for all
gliders as the pilot can easily sight right down the tow line to
positively, absolutely stay in position behind the tow plane. And if
the tuggie feeds you the rope 'cause he doesn't approve, "What the
heck!" it's just another big, very well damped, yaw string streaming
back.

bumper
bumperm at verizon dot net (thanks Eric)


Bumper
Ah yes, I look forward to the seemingly annual Mark IV Yaw String
thread. I also look forward to your Mark V upgrade...I am sure it will
be a hit. I suggest an electronic version...perhaps with several hard
drives which would require additional batteries of course. Maybe include
a digital HD readout. Also don't forget a transmitter so we can follow
your turn coordination online. Hmmm then if you upload to the OLC in
real time, you could.....

Paul
ZZ