N13XZ. Modified W-10
Phase 1 test in progress. First flight 26 Feb 2016
I bought the plans, #975, from Mr. Wittman in Sept 1993
which came as W8 with W10. I dreamed, studied, researched (Clement Mods,
Stanton manual, Tailwind forum, Sport Aviation, NACA, Cafe), and planned until
15 July 2013. I modified N13XZ for my mission.
Many friends helped with important contributions, parts,
ideas, suggestions, encouragement THANK YOU!,! Lynnet, my beautiful wife,
arranged funding and suggestions on the cowl, steps, baggage, windows, and etc.
Final mission target is 200lb
pilot/passenger/gas/baggage, 200mph cruise, TO/land 700 ft at 3640 ft msl 80*
I targeted 24"+ prop clearance 3pt and 12"+ level,
changed every tubing size, and increased the fuselage length 12" while
adding one bay to strengthen the tail area. I also increased the size of both
the horizontal, vertical, and the rudder is 50% larger. Horizontal trims same as
Also bought Calbie Wood wing plans. To these I increased the
span 6 feet, increased the thicknesses of all parts, added nose ribs in the
fuel bay areas, built 26 gal fuel tanks per wing to supplement the 20 gal
header tank, doubled the ribs in control areas, repositioned the strut attach
point, built Wittman tips of aluminum, moved the controls for the ailerons
closer to the rear spar, which increased the cord of the ailerons about 50%,
and added fowler flaps which reflex up 3 degrees and deploy to 46 degrees. These
flaps reduce the stall 15 mph ias. Control fittings are beefed up also.
The doors are Plexiglas covered and hinge up which I like
very much. The door lever becomes my arm rest. The windshield is 1/4"
Lexan. Brakes are double puck Cleveland with 6×6 tires.
I have built retractable wheel skis which I plan to test
during phase 1.
So 2403 hrs later the 1557 lbs empty weight is heavy, but it
includes a IO520D turning a 58 Mac 82 inch, and 18.3% MAC is 1896 lbs- that's
me, 20 gal gas, and a fire extinguisher.
14 flights later at 32S I find that she goes up good 3640msl
35 degrees F TO 20 degrees flaps 2650 rpm 25 in takes 5-6 seconds is at <60
ias climb at 80 ias gives 1000 ft elevation agl at the end of the 3800 ft rw
cht 320 which is good for starters . Stall full flaps idle power is 45 ias
about the same as gps, no flpas 60 ias,
WOT 151 kts gps 7500msl 35 *F. 2200 rpm full flaps cht 280* level flight 40 ias
50 gps as long as you want.
She’s Noisy, Shakes, and has a Trilling climb. Searching for
more speed, but I like her.
Craig E. Thomas
EAA102643 N13XZ N4546F Ckye Field, Montana.
Update 23 July 2016
Added modified Sportsman cuff to wing leading edge. At 1900#
low power no stall mush all flaps setting WOT reduced 3-5 mph top 2382# stall
65ias flaps 0 stall 45 ias 46 degrees left wing drops. 46 degrees flaps at 20
in 2300 rpm 0-40 ias approximately 40 kts gps I can rotate from 45 degrees bank
left or right or fly in a circle maintaining 6500msl very solid feeling.
Landing approach 65ias results in a landing roll less than ½ before cuff touch
down approximately 50 ias. Lands easier at 2382 than 1900. TO 1900 # 2.5-4
seconds climb similar at 80 ias.