charosenz
Well Known Member
GOOD news on gearbox temp...
Good news. I got the green light from Viking to allow max temp of 230F. I cannot say why the max temp limit was changed, but at least this will allow me to head up in to the max torque RPM of 4800 that I really have been hoping/expecting to use for top RPM for climb and max cruise. It will be very interesting to me to see what 32" to 36" MAP results in for RPM at say 7000rpm with the prop set at 22 degrees. Considering I get 1000fpm at 34" MAP at MSL I suspect I will end up trying 23 degrees at some point.
He also said that I need more blast air to the gearbox. I will be increasing my main blast tube to 2" (centered on the bottom bearing) and I will and an additional 1.25" tube to the top gear as well as needed.
It is projected to be solid drizzle rain here for at least 5 more days. So it will be a while before I can report more test results.
Good news. I got the green light from Viking to allow max temp of 230F. I cannot say why the max temp limit was changed, but at least this will allow me to head up in to the max torque RPM of 4800 that I really have been hoping/expecting to use for top RPM for climb and max cruise. It will be very interesting to me to see what 32" to 36" MAP results in for RPM at say 7000rpm with the prop set at 22 degrees. Considering I get 1000fpm at 34" MAP at MSL I suspect I will end up trying 23 degrees at some point.
He also said that I need more blast air to the gearbox. I will be increasing my main blast tube to 2" (centered on the bottom bearing) and I will and an additional 1.25" tube to the top gear as well as needed.
It is projected to be solid drizzle rain here for at least 5 more days. So it will be a while before I can report more test results.