I started a post yesterday before 'Gator posted, attempting to explain why you needed more gear. I saved a draft (I thought) because I had to be elsewhere. Now I find that it didn't save it, but I do see that 'Gator summed it up in one sentence . . .
Your primary issue is not enough gear to use the new hot rod engine.
In your first, initial post:
You start out by saying you don't want to talk about gearing.
You want help with swapping engine parts to offset/correct performance issues.
You know that you are over spinning the prop but don't care.
-- I point this out,
not to give you a hard time, but only so you hopefully see how silly that first post reads.
A man needs
three things to work together to build an all around bad ass performing airboat.
-- You already have a bad ass
engine and a new,
potentially bad ass
prop.
-- The last missing piece that you need, is a
gear ratio to allow both of then to run in their native power bands at the same time.
This is exactly and very specifically, what you are lacking.
You don't seem to realize it, but you were initially seeking help to swap out engine parts to bridge the performance gap that was created simply by starting with the wrong gear. The other drawback to this approach is that before long you don't have your 540hp engine.
You feel as if you have proven to yourself that your Falcons need and want tip speed rather than more pitch.
Not only is this wrong, but it is exactly backwards and goes against all prior experience.
I’ve found that the falcons rather tip speed than pitch and my test is with added pitch turning 5k the levee we play on I struggled to stop half way up and had to rudder ti take off by myself. . Take some pitch out and let it turn up to 5400 I can do it with ease with a passenger. This "test" does not show where the prop is efficient. This only shows how and where it is more efficient when using the wrong gear. Being outside of the manufacturer's specs should show you that the prop is NOT operating in the neighborhood it was designed for.
That to me is a dead sign it likes to turn up regardless of them saying the sweet spot is 2450. All this proves, is that with the wrong gear operating the prop outside of its' design parameters, better results are attained by taking out pitch.
Scenario One:
The prop at it's designed pitch turns 2450 RPMs.
. Given your 2:1 gearing, that equates to 4900 RPMs. This puts your engine well below its' power band.
. . Your performance is lacking so you want to swap engine parts to correct the issue.
Scenario Two:
. The prop at it's designed pitch turns 2450 RPMs.
. . You use a 2.3 gear, which equates to 5,635 RPMs. This puts your engine in the neighborhood of its' power band.
. . . You adjust prop pitch up and down to find the sweet spot.
. . . . You go part way up the levee with two passengers at <5000 rpm, stop, and then resume with no rudder.
A guy I know has a 2.3 and wants to switch to a 2:1 but man all the ppl around here that tried the 2.3 say the don’t like it.
^^^^^ This is the best news of the day, week and maybe month . . . ^^^^^
And provides you with a very unique opportunity to cost effectively 'learn all them ppl around there'
that any gear will perform when it provides the needed match between the engine and the prop.
Better be careful if you don't want to become a local legend in them parts, throwin' conventional wisdom to the wind n all that.
When they see you running around at half throttle with them skinny headers and a forsaken 2.3 box, there ain't no tellin' what they'll do.
