GroundLooper wrote:
I know that big bore props equal safety. Most people don't.
Lesuther wrote:
They can be, but not necessarily. The strips were made for JN-4's, Tiger Moths, Travelairs, ....a C-150 has better performance on a bad day than most of those planes had on a good one.
GroundLooper wrote:
They just hear them as a loud, obnoxious intrusion into their escape from the bustle of society.
Lesuther wrote:
Exactly. Reduce the frequency and volume a bit, problem largely solved.
If reducing rpm on the roll or after rotation is a good idea, why don't the mountain flying clinics teach it?
Here's a clue:
http://www.ntsb.gov/aviationquery/brief.aspx?ev_id=20001212X21599&key=1http://www.ntsb.gov/aviationquery/brief.aspx?ev_id=20001208X08519&key=1These highly experienced professionals both died on departure. If you do everything right in the backcountry, departure is the most exposed and dangerous time. Just because technology has improved since these strips were built is no reason to turn your back on performance you have available to get some altitude and some options. There are lots of folks in Alaska who have to stooge around a few hundred feet AGL to get anywhere for much of the year, and I don't envy them. I'd guess that they'd rather have more distance between them and the rocks most of the time if they could manage it.
The sound of silence is still fresh in my mind, more than two years after I lost the engine. I've also hit the sinker from hell that had me skimming tree tops just so I could get to the river and fly down it to build up enough airspeed so I could climb. My bucket of luck came close to being overdrawn those times, and I'm not about to forget the lessons I learned. I am more vigilant about scouting the areas surrounding strips for emergency put-down spots. I think about where I'll go if I have to put it down--uphill, into the wind etc. I
do not take off if the wind is blowing more than a light breeze. I have changed my departure routine from remote strips to include climbing overhead until I have enough altitude to continue en route and some options in case the engine decides to take holiday. I dial the prop back once I'm 1,000' agl. I'm glad to climb at a slower rate once I have enough altitude to know that I can get back--and 1,000' agl is slicing it really slim in a real world engine failure.
That said, putting a longer prop on an engine that only results in tips going transsonic at the same rpm that a stock prop turns may result in less climb performance. That's lose-lose 'cause you're not climbing as fast as you could and you're pi$$ing off the neighbors. Maybe the seaplane Skywagon guys know different. But some engines like the IO520F make their maximum hp at higher rpm (2850) and they drive props that flirt with transsonic speeds. Dialing those props back reduces noise but it also reduces power output from the engine. Show me a quieter prop that generates better climb performance than my old McCauley C90 and I'll be all over it come time for overhaul.
If I ever have an engine failure on takeoff or hit the sinker from hell off the departure end again, I don't want my last thought to be "Gee, I sure hope those folks on the ground appreciate how quiet I was flying when I killed my family."
My $.02
CAVU