STAINLESS OR NOT

G

gbrowne63

Cadet
Joined
Jul 17, 2022
Messages
18
I have a thundercraft firebird 143V (canadian) with a 90hp mercury 3cylinder. The boat weighs 600-700lbs. With a 13.5X21 turning point prop i get 44mph at 5800rpms. With a slightly damaged 13.5X23 turning point prop i get 46mph. should i get a stainless 23p or maybe a 22p stainless. what are your thoughts. thanks
 
Texasmark

Texasmark

Supreme Mariner
Joined
Dec 20, 2005
Messages
14,664
gbrowne63 said:
I have a thundercraft firebird 143V (canadian) with a 90hp mercury 3cylinder. The boat weighs 600-700lbs. With a 13.5X21 turning point prop i get 44mph at 5800rpms. With a slightly damaged 13.5X23 turning point prop i get 46mph. should i get a stainless 23p or maybe a 22p stainless. what are your thoughts. thanks
Click to expand...
According to TP, the only difference in props is blade thickness which I doubt would change WOT 100 RPM. I ran a 24 P SS Ballistic on my 17.5' stepped hull alum BB, picture of it in my Avatar kissing 50 at around 5600 RPM. Rev max spec. is 5500 but I don't have a problem running over it.
 
Texasmark

Texasmark

Supreme Mariner
Joined
Dec 20, 2005
Messages
14,664
dingbat said:
Thinner, stronger, less flex
Running a SS prop on a 90hp motor is futile
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"Running a SS prop on a 90hp motor is futile"

Not so sir. My Ballistic SS had stellar performance on my BB as I indicated above on my 2002 stock Merc. 90 2 stroke when it was around 10 years old. My Avatar speaks for itself.
 
dingbat

dingbat

Supreme Mariner
Joined
Nov 20, 2001
Messages
16,063
Texasmark said:
"Running a SS prop on a 90hp motor is futile"

Not so sir. My Ballistic SS had stellar performance on my BB as I indicated above on my 2002 stock Merc. 90 2 stroke when it was around 10 years old.
Click to expand...
Stellar is empirical.
What quantifiable improvements did a $600 SS prop have over a comparable aluminum prop?
 
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