length or pitch

used to be longer was better down low and shorter was better on top end but nowadays who knows anymore??? best to get a hold of them and spin before you buy
 
Well for what its worth. When I was gonna buy my Q-Series,I was going to go with a 72". I was told that if I wanted more push to go with the 74". So go from there.
 
my straight valve 540 pushes real good with my 76" terminator, thats what tim wagman at florida airboat propellers sold me and i never tried any other size, just wondering if it was worth the hassle.
 
if it works for ya and you are happy and it is in good shape ...... nope wouldn't change a thing now when it goes south well then look into a whisper tip from whirlwind
 
length is better on the hill but to go to a 78 is not going to make enough difference now if you had a 70 or 72 and you moved up you may have seen a difference
 
70" real snappy an authoritive

72" good all around prop

74" no snap but great hill power




If you have a 76" then sounds like you have what you need
 
thanks, probably leave it alone then , i'm real happy with it just thought i'd get opinions on what y'all thought sounds like i got the right combo, thanks
 
I have always been told that every inch of length is equal to 2 degrees of pitch I don't know if any one has heard any different but I run the longest prop I can and still pitch it between 2 and 3. As long as I can still turn it the rpms I want.
 
Have a 320 lycoming

Had a 66' cypress
lots of snap
lots of pitch
good all around

Got some signature blades with the small hub -70"-
little less snap
more push on ground
and a some on top
nice torque roll when you smash it

I vote length

Also, with my senerio you gain 4" of PROP rather than HUB
 
In my experience the longer the prop w/ of course less pitch pushes better and gets better fuel mileage, but has less snap than a shorter prop w/ more pitch.
 
FLA BOY said:
In my experience the longer the prop w/ of course less pitch pushes better and gets better fuel mileage, but has less snap than a shorter prop w/ more pitch.
Click to expand...

That's kind of what I think as well, but that is just "thinking" and "feeling", but nothing scientific. I like to use max prop, with minimum pitch, but that's just me. Any of you guys that have done some thrust testing and could chime in would be cool to see the results.
 
read this info on a website the other day - pertains to some of the above questions :rebel:

Facts

As a propeller tip speed increases the efficiency decreases.

The larger the diameter of the propeller the more effective disk area it has.

To increase disk area is to increase thrust

It is common practice to decrease the diameter of the propeller to increase its rpm to get more horsepower from the engine.

As a general rule of thumb if you increase the engines rpm that will increase its horsepower

If you reduce that rpm by half thru a reduction unit you will double the torque output of the engine.

Horsepower is not the determining factor for sizing a propeller.

Torque is the determining factor for sizing a propeller.

It is more efficient to go with the larger diameter propeller at a lower rpm.

If you increase a propellers diameter from 60" to 84" it will increase its effective disk area by 96%.

Any increase in the props effective disk area. will increase its output .
 
Ok..update. ..i switched from the 76 inch terminator to a 70 inch 3 blade and it's night and day difference, I gained a pot load of snap top end speed is ten times faster and it seems like it has more push once u get it wound up , I'm extremely happy with the overall performance of the 3 blade.
 
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