prop survey
 

to all steplift owners only, this is what i need
1# what size prop are you furnning
\2# what material, stainless steel aluminum?
3# what is your top speed
4# what is your rpm at top speed
i will start
13 1/4 19 s.s. 27 mph 5800
i think i could do better with a differant size prop so instead of buying them all i will ask my friends who are wellcraft owners to help me out
thanks

Re: prop survey
 

15 1/4" dia x 17 pitch

Stainless

42 mph On GPS @ 6000rpms




;D

Re: prop survey
 

i forgot to tell you i have a 1988 150 mercury out board

Re: prop survey
 

Yeah, that helps... ;) :D...figgered you'd get around to it... :)...

Re: prop survey
 

1989 Yamaha 175, * * * 15 1/4 X 15 * was runing a 14 1/4 X 17 till last week. Both Alum

Motor rated for 5500 rpm

with the 14 X 17 I could get 35 mph at 5100 rpm with 3 people 65 gal gas and gear.


with the 15 X 15 I get 30 mph 5500 rpm with same load


The new *prop gives faster plane and out the hole, better gas, and better performance all around, + it works the motor better cause it revs at the 5500 that it supose to.


The 17 pitch prop gave better speed on the top end but poor performance on the low end, faster troll, slower out the hole with prop spin, less gas milage and longer plane time

The 5 mph loss is no loss to me!!

Re: prop survey
 

My 05 Yammie 150 came with a 17" pitch. Im pulling 44Mph on my GPS at 5500 RPM WOT. *

That is with me alone and half a tank of fuel trimmed WAY up. I am debating going to a 15 pitch soon.

MJ how slow is that 15 going for you ?? I need to slow down not make my eyes water, fish bite at 1.7 MPH not 2.4

Aluminum,, all fisherman should be running aluminum IMHO

Re: prop survey
 

I am getting about 2. which should be pretty good for me. They like it here 2 to 3 mph and I was always over 3 before.
I will be doing wire line soon and will no better how its goes.

Re: prop survey
 

Hey, Strip...just curious...why should fishermen run aluminum props?... :)...

Re: prop survey
 

Fisherman should use aluminum props simply because you are going to find yourself in the rocks while fishing. An aluminum prop will take the damage as opposed to a stainless prop which will transmit the damage to the lower unit. The sacrifice made by the aluminum prop is much better than paying for a new lower unit.

completely IMHO of course,,, 8)

Re: prop survey
 

step,150 Johnson,15 1/4 x 15" pitch,cruise at 3850 at about 30 mph, WOT about 38-39 mph at 5100 rpm...oh yeah,aluminium.

Re: prop survey
 

so nobody is turning a 13 1/4 x 19 but me. reelapeeling are you sure your going 44 mph thats 20mph fasterer that me that seems like an awfull lot
is the bottom painted my is old paint and chipped so that would slow me down a little

Re: prop survey
 

heelapeeling what year is you honda

Re: prop survey
 

How can I tell what prop I have? It's obviously stainless steel, but I see no markings to indicate diameter or pitch. I can measure the diameter but how would you determine the pitch?

rick

Re: prop survey
 

it should be stamped on there somewhere,try looking right in the hub itself or right next to the nut and washer that holds the prop on

Re: prop survey
 

Hey, Step...just saw your post...not 44, but 42mph on GPS...no bottom paint, but bottom paint's not slowin' you down THAT much...

Honda is 2004 and that 42 is trimmed ALL the way up, light load and flat water...WOT 6000rpms... ;) ;D...

Re: prop survey
 

hey reel thats moving\\
so what do you think
do you think i should go with a 15 1/4 x 17
i have a 13 1/4 x 19 and you know my specs
rpms about 5900 and top speed is 27mph
with 3 people[about240 185 165] plus 50 gallons of gas and takle total weight if i had to guess 1200 lbs

Re: prop survey
 

from the questions i've asked about props, 15 1/4x 15" or 17" should get you where you wanna be. I've learned, thru this forum, that for every change in pitch,you will loose or gain about 300 rpms, lower pitch, quicker outta the hole,loose a bit on the top end. Higher pitch, slower outta the hole but a bit more on the top end

Re: prop survey
 

Step, you asked if I think you should try a 15 1/4 x 17...yes, I do...I ran a 19 pitch and like you, felt I was leavin' a LOT of performance on the table...basicly, I ran every pitch from 15 to 19...might have even tried a 20, but 17 w/a large diameter was hands down the winner because it allowed motor to spin up to mfgr's max rpm, it allowed 30 mph cruise at an rpm level that's economical and outta the hole OK to suit me...you got same HP and virtually the same hull/ weight....I think it'll work for ya...if a Mercury Mirage in 15 1/2 x 17 is in your grasp, try it... ;) ;D...my dealer here has one, but they ain't cheap...yeow!...

Re: prop survey
 

hey reel thanx you saved me alot of trying differant props i will go with the 15 1/4x17 and let you know how it runs
you sound like you know what your talking about and again thanx

Re: prop survey
 

i just looked on the comp. and i counld get a 15 x17 aluminum prop or a 15 1/4 x17 s.s. prop whitch one do you have or recomend

Re: prop survey
 

Mine's a SS...I hear what you're sayin' re aluminum, but I like SS...If it were me, I'd go w/ the latter... ;) 8)...

Re: prop survey
 

Step, IMO, the noticable difference between the s.s. and aluminium, is price and thats it. You're not going to see a dramatic MPH difference, you may SEE a rpm difference because the s.s. blade is thinner and will turn a little free-er. Also, if you did bounce the s.s. off a rock or something you risk more possible damage to your drive system...with the aluminium you just bend or break a blade[or two].If it were a raceboat of sorts,then you gotta go w/ S.S.I've got a 15 1/4x15,which on my 86 hull , 150 Johnson is good all around. as a spare I'll get a 15 1/4 x17, just for a little more on the top end.BTW,aluminium.

Re: prop survey
 

The biggest difference in the stainless and aluminum is Stainless props are usually more aggressive due to they are Cupped and Aluminum props aren't. The cup gets you out on plane faster and helps when in rough seas or pulling skiers to get a good hard low end thrust. The stainless is used more for salt water use due to sand bars which kill the aluminum props but dosn't hurt a stainless plus salt eats up and away an aluminum prop. personaly i only use stainless on all my boats but keep a cheap aluminum for a spare in case were to spin a prop.

Re: prop survey
 

This is an old thread, but here's the bottom-line for me on props...if your choice of propellers will not allow your outboard to wind up to the max RPMS the mfgr specs, then you're over-working your motor every time you run it and forshortening it's life...on the other hand, if your prop allows your motor to OVER-REV, then it shouldn't take a rocket-scienist to tell you you're brewin' up a big problem there... :o...you gonna BLOW CHUNKS twice...first, chunks of aluminum all over the water, then blow your own chunks when you see the repair bill!!!... :o :P...

Of course all the above is only MHO... ;)...

Re: prop survey
 

I never really paid much attention to my prop. It seems to be working fine. But after reading this thread I decided to figure out what I have. Currently I have a stainless prop with no markings anywhere that I can find mounted to a 1989 165hp, 4cyl. w/ alpha 1 outdrive. The old aluminum prop has the no. 48-78122-21 in the center of the hub and the no. 48 78122 A40 21P on the side of the hub. Holding the two props side by side, they appear to be the same size and pitch. Anyone know if the diameter and pitch can be determined from either of these numbers? Also, according to the Clymer manual the full throttle spec on this engine is 4200 - 4600 rpm. The most I can get is 3600 rpm. I this enough of a difference to be concerned with? The previous owner had the outdrive replaced after the original one was stolen so now I'm wondering if the current prop is different than the original and possibly wrong for this engine / outdrive / boat. Any thoughts?

Re: prop survey
 

You've got a 21 pitch prop on there and that's probably why you're not able to get the recommended RPM's. You should need about a 17 pitch to bring it where it needs to be. You're really working your motor hard by running that prop. I would also wonder if you've got the correct gear ratio in that outdrive that the previous owner replaced. Assuming that the gear ratio is correct, just try a lower pitch prop.

Re: prop survey
 

Rick i'd try a Cupped 17 pitch stainless prop.

Re: prop survey
 

Rick...yeah...big loss in rpms...I'd second all CB and Skool said above...only addition would be to recomend a large diameter prop...15" to 15.5"...good luck w/it!!... ;) ;D...let us know how it works out...

Just remember...depends on what you want your boat to do...your "hole-shot" may be pretty good...Great for skiin'...if you change your prop, you may lose some of that and gain top-end...but what CB said about strainin' your motor w/that prop is true, so I'd tell ya to get down off the 21 just because of that...

Re: prop survey
 

RICK.IM RUNNEN A 4CYL MERC 170 I/O IM PLEASED WITH THE PROFORMENCE WITH A 19 P PROP AT A 3500 RPM CRUSE IM AT 24-25 KNOTS AN WOT 29-31KNOTS ALUNINUM PROP#48 78120 4A 19P ,IWAS USEN A *17"SS PROP FOR YEARS IT WAS A GOOD PUSHER PROP GAVE A GOOD PUSH FROM A STOP BUT LOST TOP END SPEED THAT PROP GOT 19 KNOTS AT 3500RPM AN TOP SPEED AT 25 KNOTS #48 888438 17 ,IM STICKEN WITH THE 19 FOR NOW TILL I TEAR IT OP INTHA SAND.

Re: prop survey
 

Thanks,

Now a couple more questions -
1. How do I determine outdrive gear ratio?
2. Where's a good place to find a prop?

Rick

Re: prop survey
 

RICK ,YOU LOOK FOR THE STAMPED #S ON THE UPPER HALF OF THE O/D IT MAY UNDERA DECAL.IDONT REMEMBER THE CODE S BUT I BELEAVE YOU SHOULD HAVE A 1;84/1 RATIO WITH A 4CYL, ITS BEEN A WHILE AN I MITE BE OFF ON THAT

Re: prop survey
 

As far as where to find a prop...look on the shoals CB drives MJ's V20 over... :o ::)...sorry CB...couldn't resist... :)...

Re: prop survey
 

They's junk when I get done with them. Don't bother looking there. ;) ;D

Re: prop survey
 

http://www.rbbi.com/folders/prop/propcalc.htm

two 140hp 1990 OMC. 14.5 x 24 CR 55mph @ 6200rpm (WOT) Flat seas, 40g fuel, just me on board.

Can do a lot better going with that screaming tide through the Galveston ship channel. I have clocked 70 on the gps with the tide and a 25mph wind at my back.

Re: prop survey
 

OK, one more question - Current prop is 13" diameter, how does increasing the diameter to 15" - 15.5" as RP suggests affect performance? I've done a little research on the web and there seems to be much discussion about the affects of pitch but very little on diameter.

Rick

Re: prop survey
 

Havis - What's you range with those two piglets sucking down on a 40?

I thought 40mph on my v20 was flying . . . the bow flare grows wings after that speed.

Re: prop survey
 

I have 88 gallon total capacity and get about 2+mpg at 4000 rpm/35ish mph cruise. I don't have a real handle on fuel consumption: I haven't been out enough with real good numbers to work with. My goal is to be able to go 60 miles offshore. Those engines sure are thirsty, I was hoping for 3+ mpg but I don't think I'm there.

Re: prop survey
 

Havis - One Merc blackmax 200 or Yamaha 200 . . . will get you about 3mpg cruise @ 30/31mph.

If you run a Yamaha T series four stroke kicker or even a OMC sailmaster with a barge prop then you could hit tuna Trolling speed.

The nice part about your setup is that you can easily plane home on one engine and those OMC engines are pretty damn reliable.

Re: prop survey
 

I was out the other day about 70 miles trolling for fishes on a 31' CC sportfisher with twin 225 yammys and one spun a prop. Had to plow back 70 miles. It nearly ran us out of gas and too a l-o-n-g time. One engine just would not get her up on a plane.

I guess 2mph ain't too bad if a single 200 gets 3. I hope the engines last forever: so far, so good. Mixing the oil is a pain though but everyone says don't hook back up the VRO oiler.

Wow this is off topic! :~)

Re: prop survey
 

Screw the topic... ;D...that's one thing that makes this board so GREAT...the threads go where they go... ;)...

Mixing the oil?...do you have one of the Accu-Mix bottles...makes mixin' a piece of cake!!...$3.99...other name-brands work as well...