Gearing/Prop Questions

[franky]

OK,
So I have a Schiada 21RC, 844 HP 468 Blower motor. the V-Drive currently has 50 gears. I have a set of 36 and two props to try: 11 3/4 x 16 and a 11 1/4 15 Menkons. Where do I start? BTW, no 1st gear.
Thanks in advance for the help. Franky

[Kindsvater Flat]

Big gear, little prop but I'm guessing little gear, little prop. :D

[GofastRacer]

OK, Where do I start? BTW, no 1st gear.
Thanks in advance for the help. Franky
You start with what you have on it now and go from there!..What's wrong with the current setup??. :confused:

[olbiezer]

i am thinking u need to sell me the 11 1/4 x 15 and use what u got lol

[franky]

You start with what you have on it now and go from there!..What's wrong with the current setup??. :confused:
Thanks for stating the obvious. Might as well start with something in the range or reality. 50's, so which prop? However if I am wasting my time with the tall gears, I want to change out now.

[GofastRacer]

Thanks for stating the obvious. Might as well start with something in the range or reality. 50's, so which prop? However if I am wasting my time with the tall gears, I want to change out now.
You're not wasting time, try what you have and see what happens maybe the motor isn't what you think it is?????, Only takes 5 minutes to change props!..

[superdave013]

50's sound pretty steep for a 468" deal. But if it was me and those were my 2 choices I'd prolly give what evers in the box a spin first.
Props, well you can get 2 props that are so called the same and they seem to work different. So it's back to ya just gotta run 'em both.

[franky]

Big gear, little prop but I'm guessing little gear, little prop. :D
Thanks
Any one else?

[franky]

50's sound pretty steep for a 468" deal. But if it was me and those were my 2 choices I'd prolly give what evers in the box a spin first.
Props, well you can get 2 props that are so called the same and they seem to work different. So it's back to ya just gotta run 'em both.
I was thinkin they may be steep. The guy (EZE) I bough the Schiada from had a 1,100 HP twin turbo deal. 25% more power. If I am wasting my time with the 50's I want to change now so I am starting with a more realistic setup. But....new to this and lookin for input.

[Kindsvater Flat]

FYI but J540 would probably take those 50's off your hand if you don't need them or end up not using them.

[Little Wood Boat]

These are the questions you have to work out for yourself. Big ear props? Cupped? Two blade? Are they really the size that's stamped on the hub?
Easy answer is pick the big one...see if the tail lifts too much, gets loose at the back at high speed, (assuming you're looking for high speed). Cheek the slip...do your math and figure if the prop's performing correctly. See what your motor does, RPM wise at top end. What do you want to cruise at for rpm's. Remember water conditions play as big of a role as any other factor on a cruiser.
The fun here is the learning about the shit you've got...any one can write a a check for the answers.
And when you're all done you'll wind up with props sitting all over the place...desk paper weights...on loan to friends, spares of the same, then someone like Tom will sell you another one!

[GofastRacer]

I was thinkin they may be steep. The guy (EZE) I bough the Schiada from had a 1,100 HP twin turbo deal. 25% more power. If I am wasting my time with the 50's I want to change now so I am starting with a more realistic setup. But....new to this and lookin for input.
You don't know what's realistic until you try what you have!..

[Dimarco21]

OK,
So I have a Schiada 21RC, 844 HP 468 Blower motor. the V-Drive currently has 50 gears. I have a set of 36 and two props to try: 11 3/4 x 16 and a 11 1/4 15 Menkons. Where do I start? BTW, no 1st gear.
Thanks in advance for the help. Franky
I have a 21' Dimarco with the same motor setup, I run 37 gears with a 12" x 15 1/2" 3 blade Menkins prop. I ran 29's before this and I like the 37's better, it settled the boat down at launch to mid range RPM. Dropped 500 RPM's at WOT, but gained 2 MPH at top end. Mo' better gas mileage at cruise speed too.

[schiada96]

What is the boat doing now,keel flat ride at speed?

[Hallett]

Franky call mike at prime marine he will help you out.
i can tell you is i tried the 38's and did not like them
we put the 27's or 28' in and the boat came alive, im
still trying to get it dialed in but am geting close i
think 29's to 32's would be perfect for me with the
11.5 x 15 prop. at one time my boat had a 496 blower
motor in it with 29's keith at conquest had the same
deal at one time he ran 29's before he went with the
582 motor. hope this helps. welcome to the world of
v- drives there is nothing like them. :p

[Hallett]

I have a 21' Dimarco with the same motor setup, I run 37 gears with a 12" x 15 1/2" 3 blade Menkins prop. I ran 29's before this and I like the 37's better, it settled the boat down at launch to mid range RPM. Dropped 500 RPM's at WOT, but gained 2 MPH at top end. Mo' better gas mileage at cruise speed too.
thats what i need better gas mileage at cruising speed
im at 6000 rpm and have moor left in it with the 27's
or 28's. i think like 32's would be perfect for my boat
and i know your boat hauls the mail very nice boat
i know it took you some time to get it right.

[schiada96]

Scott
I was there I don't know if I met you. My boat is white and orange it's on page seven and eight of the jokers wild website

[Dimarco21]

thats what i need better gas mileage at cruising speed
im at 6000 rpm and have moor left in it with the 27's
or 28's. i think like 32's would be perfect for my boat
and i know your boat hauls the mail very nice boat
i know it took you some time to get it right.
With the 37's we cruise at 55-60 mph range at 3 lbs boost. With the 29's at that speed, boost was about 5-6 lbs. It was a hard speed to cruise at. The motor was runnin' at that RPM edge (4,200-4,500) where the secondarys would just start to open, any "bump" in the water and my boost went to 10-11 lbs.
Bottom line. With the 37's I think it loads the motor more at WOT but it is easier on it at cruise speed.

[VD CRUISER]

In my 21 Howard with a blown 540, I run 48's and turn about 6200-6400 rpm at wot with a 11 3/4x16 two blade Menkens, about 200 rpm less with a 11 1/2x15 1/2 three blade. My buddies Schiada 21' with a blown 540 runs 37% gears. Every setup is different, like Art says, you just have to try somethng and go from there to get the engine in the rpm range you like. With that said, the 50's will probably be a little steep for your engine.

[Little Wood Boat]

So VD Cruiser, what's the top speed with that setup and gears?

[VD CRUISER]

Best ever was 110 on radar last fall in good air. In the summer heat its 2 or 3 mph slower.

[lucky]

MAN I COULD USE THAT BIG PROP :) I RUN A 468 /177 @5LBS WITH ALOT LESS POWER ( 550-600 GUESS )-- 15% GEARS AND 11.5X14 THREE BLADE NEW ENGINE I WILL LET YOU KNOW WHAT IT DOES - BUT I KNOW I NEED A LAGER PROP AS I HAD 29 % AND IT WAS WAY TO LARGE FOR ME ! ( i NEED TO SLAP THAT 6/71 I HAVE ON - i need more money ________ :cry:

[Little Wood Boat]

VD C, Thanks for an honest sounding answer...the reason I was interested was that alot of props that I've had checked out (radii averages) that are marked 15" or 15.5" only make out to be around 14". If any one has had this done will understand that their prop is hooking up better with alot less slip. It gives better apple to apple #'s for props.

[VD CRUISER]

Little Wood, I've tried lots of props,but never had anyone check them, I just go by the marking on the props. Most of the time I deal with Dallas at Menkens, and we discuss what the boat is doing and decide on a new prop. Going by what he says it is, I have about 21% slippage. Also the 3 blade is about 4-5 mph slower than the 2 blade. On my boat I moved the strut forward and changed to 7.5 deg. from 9 deg. I have also done some bottom blueprinting. Its taken a lot of work to get it to go that fast.