|
|
My question is, Is it possible to go to a larger prop? I am going to use a constant speed prop but would prefer a larger diameter if possible (72 in.?) Has anyone explored this possibility?
Mark,
I have a 72-inch Hartzel prop on my Lancair 360. That was the recommended prop back then. If I can trade my prop for a 68-inch, I would do it in a second. Mainly due to the added prop-to-ground clearance. Lancair also conducted performance tests between the two prop sizes. The 68-inch prop was faster in cruise while the 72-inch prop climbed faster...(see chart below)
72-inch 68-inch
Cruice@7,500 Ft (mph) (knots) (mph) (knots)
2500rpm/23.9" Hg 233 203 237 206
2500rpm/21.8" Hg 221 192 228 198
2500rpm/19.5" Hg 210 183 211 183
Cruise@12,500 Ft
2500rpm/19.5" Hg 227 197 233 203
2400rpm/19.5" Hg 223 194 227 197
2300rpm/19.5" Hg 221 192 228 198
2200rpm/19.5" Hg - 224 195
Climb: (1,000' climb from 4000 MSL)
IAS 72-Inch 68-Inch
(mph) (Knots) (fpm)
80 70 1670 1430
95 83 1760 1460
120 104 1880 1670
140 122 1765 1670
Rick Argente
360ZR
|
|