![]() |
First Pitch...
Quote:
Weapons school answer: it depends... Prop manufacturers measure pitch at different blade length percentages. Therefore 85 pitch on a Sensy may not be 85 on a Hartzell. My field experience has shown the 85 pitch Sensy coupled with a clean RV airframe will turn 2800 at 8500" 175 KTAS. The hartzells governed at 2700(unless you tweek it) so in effect you get a bit more top end, the Hartzell better takeoff. Personally I wouldnt remove the Sensy unless you operate off 1000" strips regularly. I would sell/trade for a Catto three blade first. The extra 6-8 grand buys alot of 100LL. My Dos Centavos Smokey |
Hey
Quote:
|
hartzell
From hartzell: 5. Special Inspections
A. Overspeed/Overtorque An overspeed occurrs when the propeller RPM exceeds the maximum RPM stated in the applicable Aircraft Type Certificate Data Sheet. An overtorque condition occurs when the engine load exceeds the limits established by the engine, propeller, or airframe manufacturer. The duration of time at overspeed/overtorque for a single event determines the corrective action that must be taken to make sure no damage to the propeller has occurred. The criteria for determining the required action after an overspeed are based on many factors. The additional centrifugal forces that occur during overspeed are not the only concern. Some applications have sharp increases in vibratory stresses at RPMs above the maximum rated for the airframe/engine/propeller combination. (1) When a propeller installed on a reciprocating engine has an overspeed event, refer to the Reciprocating Engine Overspeed Limits (Figure 5-3) to determine the corrective action to be taken. (2) When a propeller installed on a turbine engine has an overspeed event, refer to the Turbine Engine Overspeed Limits (Figure 5-4) to determine the corrective action to be taken. (3) When a propeller installed on a turbine engine has an overtorque event, refer to the Turbine Engine Overtorque Limits (Figure 5-5) to determine the corrective action to be taken. (4) Make an entry in the propeller logbook about the overspeed/overtorque event. Can't get it to copy but figure 5-3 states any thing over 110% for 20 seconds requires evaluation by licensed facility. You do your own math. I realize that in the experimental category you can do anything you want, but it doesn't pay to be uninformed. I doubt that racing aircraft go to 2000 hours without a teardown. |
Overspeed Warning!!!
---This is the over-speed statement in the Whirlwind manual that came with my propeller. I am sure they are using the standards set fourth by Hartzell so as to avoid any legal issues. Regards all, Allan :)
. 5.3 Overspeed Warning It is possible to overspeed the propeller by rapid throttle advancement. Therefore, always adjust the power and RPM lever slowly and smoothly to avoid the possibility of overspeed. If an overspeed occurs: Overspeed Occurrence Required Action up to 110 % of the max RPM A 50 hours inspection must be performed immediately by a certified A&P mechanic 111% to 120% of the max RPM A mandatory teardown inspection at the factory is required above 121% of the max RPM No further use of the propeller is permitted! The propeller must be returned to the factory for inspection. WARNING: Failure to adhere to these guidelines may lead to a catastrophic propeller structural failure. Any type of structural failure may result in death or severe bodily injury. |
Quote:
If that is the case, I'll stick with my FP Catto. |
Quote:
|
| All times are GMT -6. The time now is 06:40 AM. |