Any prop gods about???
Submitted by Darren Long on Wed, 2011-08-31 17:25
Hi all, need a bit of advice, I have a 4 blade 14 1/2 x 15p prop, im getting 6100rmp trimed out and light-ish load, I would really like to hit 6400rpm I can get a hold of a 4 blade 13 3/4 x 17p to try out for a few days, do you think that this prop will exceed 6400?
I have tried the Revolution 4 17 Pitch (14-5/8x17) with only 5500rpm
also the Mirage Plus 18 Pitch (15-3/8x18 with only 5700rpm
your thoughts please
Cheers
Darren
Alan James
Posts: 2223
Date Joined: 30/06/09
If no one can help try this guy
http://www.propellers.com.au/
I think Michael Constantine is his name. He knows his stuff.
Darren Long
Posts: 23
Date Joined: 19/10/10
Thanks for the link Alan
Thanks for the link Alan
nico
Posts: 226
Date Joined: 17/08/10
what mercury model and type
what mercury model and type of boat ? Where is the cav olate in relation to the bottom of the hull and do you have setback or wedges?
In Mocean
strike_zone
Posts: 403
Date Joined: 09/09/10
lower pitch
you need to go down in pitch to pick up more revs
Darren Long
Posts: 23
Date Joined: 19/10/10
Nico, Motor height is right,
Nico, Motor height is right,
strike zone, no not really the case, all props are different .....also the prop i have is a 14 3/4 and the one i want to try is a 13 3/4 dia but has (to me) looks like bigger ears and a taller rake in the blades
alfred
Posts: 3097
Date Joined: 12/01/07
Is this on a Verado 150?
Is this on a Verado 150?
Darren Long
Posts: 23
Date Joined: 19/10/10
No...300 Verado
No...300 Verado
Brucesta
Posts: 1721
Date Joined: 29/05/09
i would have thought 6100rpm
i would have thought 6100rpm would be the rev limiter, man my 200 will only pull 5600rpm and thats WOT at 41knots. is it really gonna be worth it? how have the prop changes affected the economy? thats wjhat i'd be looking for
Las Vegas - Rolling the dice and trying your luck. 1M+ Barra summer target. 100kg Black Marlin winter target
Darren Long
Posts: 23
Date Joined: 19/10/10
G'day Brucesta, well i just
G'day Brucesta, well i just spent 30+k on a motor so fine tuneing the prop is worth every bit i think, rev limiter hits 6500rpm thats why i would like to see 6400rpm or even hitting the 6500 very light load, this is what the Verado likes, I might even end up taking 10-12mm off the tube length to gain 1-200rpm, I just cant see the sence of someone spending all that $$$$ and not get the most out of it, thats just me, i have always been like this...lol
Darren Long
Posts: 23
Date Joined: 19/10/10
Brucesta, Just out of
Brucesta, Just out of intrest, what motor do you have... year and HP?
cheers
Brucesta
Posts: 1721
Date Joined: 29/05/09
2009 Yamaha 200hp 4 stroke
2009 Yamaha 200hp 4 stroke with stock prop 19 inch pitch, 41 knots is enough for me.
Las Vegas - Rolling the dice and trying your luck. 1M+ Barra summer target. 100kg Black Marlin winter target
Darren Long
Posts: 23
Date Joined: 19/10/10
(No subject)
aaasnapper
Posts: 218
Date Joined: 15/01/10
Some basics to with props.1.
Some basics to with props.
1. The diameter is the referring to the diameter of the actual prop itself.
2. The pitch refers to the travel of the prop for 1 rotation.
Threfore- more revs- smaller pitch
Less revs- larger pitch
What you should be aiming for is getting the revs range at wot as per the recommenations of the motor.
The you can go into the materials of the prop which will effect the performance also.
Basically it is a trial and error to get the correct sizing.
null
wangler
Posts: 607
Date Joined: 26/04/08
Two props
Wouldnt 2 different props be ideal, 1 for a full boat (6400 rpm) and the other for a lighter load(6100rpm) ?
Want to make someone mad... tell a lie! Want to get the world upset... tell the TRUTH !
Dougie
Darren Long
Posts: 23
Date Joined: 19/10/10
Yep right on wangler
Yep right on wangler
Swan River Fisher
Posts: 877
Date Joined: 03/05/11
If i may ask, why do you want
If i may ask, why do you want to get the extra 300rpm. Its probably not good for the motor to run at over 6000rpm. I never run mine at top speed because the motor could burn out.
If your going to fly at 40 knots, whats difference is 1 gonna make?
Just my point of view
Benno
Darren Long
Posts: 23
Date Joined: 19/10/10
Giday Benno well i just spent
Giday Benno
well i just spent 30+k on a motor so fine tuneing the prop is worth every bit i think, rev limiter hits 6500rpm thats why i would like to see 6400rpm or even hitting the 6500 very light load, this is what the Verado likes, I might even end up taking 10-12mm off the tube length to gain 1-200rpm, I just cant see the sence of someone spending all that $$$$ and not get the most out of it, thats just me, i have always been like this...lol
Tony Halliday
Posts: 2500
Date Joined: 14/06/07
hey just a big thanks to
hey just a big thanks to Michael at Just Propellors for repair my old allie prop and the great deal on shiny brand new spanking Stainless Steel on as well.
ps if you in the market for a SARCAR anchor and bow sprit he is doing some insane magic deals as well...
Tony Halliday: ~Meals on Reels ~
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"It is always in season for old men to learn." Aeschylus (525-456 BC)
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