GRAZ
hopper
Version 8.0 Owners Manual
Updated January 2013
©2006-2013, Airparamo LLC www.airparamo.com www.grazhopper.com
Page 7 of 12
of the trike, look straight down directly above the main cable. The wheel axel should
be parallel to the main cable. If not, loosen the aluminum clamp collar to set the axel
adjustments. Once the clamp collar is loose, rotate the wheel axel so that it is parallel
with the main cable, and retighten the clamp collar. Recheck that the wheel axel is
parallel to the main cable and repeat alignment procedure until wheels are aligned.
See diagram below.
NOTE
:
A good check for proper wheel alignment is to roll the trike on concrete. The
trike should roll freely. If you notice and scraping sounds or swirling dirt or grass stain
patterns developing on the rear wheels recheck wheel alignment.
ATTENTION
:
Do not overtighten these wheel axel clamps.
ATTENTION
:
Wheel alignment is critical to maximize the ease of launch and longevity
of the tires and bearings. Wheels that are not properly aligned create a huge drag
resistance on the ground, which makes for longer and slower takeoffs. Also unaligned
wheels put enormous lateral forces on the wheel bearings, which causes them to fail
prematurely and quickly.
3.12
Attach the harness(es).
The GRAZ
hopper
trike accepts a multitude of different
harnesses. Use straps to pull the harness forward for better comfort and to adjust the
flight nose wheel angle. See photos in this manual for details.
3.13
Attach the wing hang point position.
Use the rear hole for single and the front
hole for tandem positions.
WARNING
:
You may need to experiment on the right hang position for your specific
motor unit and weight. Be sure to do a hang test before flight.
WARNING
:
Be sure to have the correct hang point arrangement for single or tandem
configurations. Flying in the incorrect hang point position would cause the trike to be
unbalanced (with the front wheel too high or too low) in the air and could be
extremely dangerous or even lethal to fly and land.
3.14
Fully tighten the cable turnbuckles.
ATTENTION
:
On turnbuckle tightening, special care
must be taken when tightening or loosening the
turnbuckles. DO NOT use any tools to loosen or tighten
the turnbuckles (or nuts on the turnbuckles) or the
threads will quickly gall and jam. Several users have
found success with a stainless steel anti-galling lubricant
on the threads of the turnbuckle, but this can become a
messy ordeal with the lubricant sticking to anything it
touches and attracting unnecessary dirt into the
turnbuckle.
ATTENTION
:
We also recommend our tested, proven approach to loosening and
tightening the turnbuckles, which will insure you years of trouble free operation:
3.14.1
Pull the frame in such a way to release any cable tension on the turnbuckle
you desire to tighten or loosen. It is helpful to use your foot to push on the lower
main frame and one hand to pull the vertical main frame support towards you. This
releases all cable tension on the turnbuckle you want to tighten.
3.14.2
With your other hand, use your pinkee to keep the lower cable from turning.
Then use your thumb and other fingers to tighten or loosen the turn buckle.
