E-mail from Mark Woodhams to John Dickenson
On Saturday 18 October 2008, Jason Board successfully foot launched
and landed the UK John Dickenson Mk 1 replica hang glider from sand
dunes near Weston super Mare, England.
We spent the afternoon making in the region of ten small flights from
the top of a 30 foot sand dune. These flights were made after we had
made the modifications that we (John Dickenson and Mark Woodhams) had
discussed at the pub in Penryn during your stay in England, which were:
1) Move C of G point aft. In fact we found that a point 47.5% back
from the nose on the keel felt best.
2) Fit spacers above cross spar/leading edge junctions to slightly
3) Apply a weight to the aft end of the keel boom to counteract the
nose down static stability of the airframe.
4) Move the A frame base bar back to coincide with a point 90 degrees
down from the new hang point.
5) Fit small king post on keel only, to lock in reflex when glider
The glider felt entirely different with these modifications and
showed no tendency to overtake a running pilot at takeoff. As a
result of these successful test flights we are going to move the A
frame base bar 8 inches further back so that the pilot can more
easily flare the glider out. We will re-rig all lower wires
accordingly but maintain the same sail to airframe geometry. The next
series of flight tests will involve attempts to ridge soar the glider
on bigger hills and windier conditions, but this is not likely to
happen before December this year, due to Jason's academic pressures.