I thought I would give an update on this ferry project.
I tested two cruise props and the results were interesting.
I didn't have OAT so the True airspeed calculations are approximate but conditions were similar.
When testing the 76/60 prop I had 120 pounds of extra weight in the rear baggage.
The airplane is a bit draggy with 7 degrees incidence, 35s, TK1s, dual shock T3, safety cables, and a belly pod.
Catto 86/38
Redline 2700 rpm - 103 mph (about half throttle?)
Static ~ 2350 (can't hold it, brakes slip, tires slip or tail comes up)
Cruise @ 6500 ft and 7.7 gph - 84 indicated ~ 93 mph TAS (2500 rpm)
Sensenich 76EMS - 54 pitch
Full throttle at 1500 ft - 2750+ (115 mph)
Static 2520+
Cruise @ 6500 ft and 7.6 gph - 88 indicated ~ 97 mph TAS (2450 rpm)
Sensenich 76EMM - 60 pitch
Full throttle @ 1500 ft 2650 rpm ~ 117 mph
Static ~ 2350 rpm
Cruise @ 6500 ft and 7.7 gph - 88 indicated ~ 97 TAS (2400 rpm)
I matched up the EGTs to the same temp each time on cylinder #1 at 7.7 gph to give the most apples to apples comparison.
I really liked the way the 54 pitch performed. A 56 might be a little better in cruise?
The 60 would be a great break-in prop but otherwise didn't seem very useful on a draggy Cub.
The difference between the Catto and the 54 seemed about the same as the difference between the 54 and the 60 in takeoff and climb. The 60 really suffered with two people and full fuel.
I'm thinking I'll stick with the Catto and not bother buying a cruise prop and paying import duty on it.
We have two 29 gal tanks that will be installed in the rear seat area and baggage area totaling 58 gal. My empty CG with 6 qts. oil is 11.1 so the CG works out fine.
Usable Fuel ~ 90
Longest Legs - 650 sm (Brasil)
Climb Fuel Allowance - 5 gals
Reserve Fuel - 20 gals
Cruise 95 MPH TAS @ 6500 ft (I'll go higher if weather permits)
Cruise fuel burn 8 gph
This basically gives me 8+ hours at 95 mph (8 x 95) = 760 miles
With a 15 mph headwind (8 x 80 mph) = 640 miles + 10 miles covered during the climb = 650 miles
More than 15 mph headwind I relax in a hotel and wait for a better day