Re: prop survey
 

thanx so i know im in thr right ball park

Re: prop survey
 

Step, my apologies, but can't remember what hp motor you're hangin' off that bracket... ::)...

Re: prop survey
 

I'm running a 14x19" pitch Vengeance, SS, 3-blade. Tops out @ 49mph w/200 Merc.

Re: prop survey
 

Tin, what kinda RPMs ya gettin' outta that @ WOT?...

Re: prop survey
 

RAP, not sure on RPM's, tach not working correctly, shows only about 3300 at WOT. I've got a couple electrical gremlins I'm tryin to work out.

Re: prop survey
 

Gotcha, Tin...is the tach adjusted to the motor it's presently hooked up to?... ???...

Re: prop survey
 

me too >:(

Re: prop survey
 

I have an 85 merc 150 on mine and since I am quite fond of running up on shoals and oyster bars as well as getting stuck at low or wind tide where I have to chew my way back into deep water , I now only run a 4 blade comprop.Its a 13.7 x 18. Sand eats up aluminum very quick and they are not cheap to fix. You can get 4 blade comprops on ebay for 20 or 30 bucks and if you bust off a fin just throw them away .I cant go fast down here anyway because of the shallow water shoals and the sloppy ocean conditions most of the time. I tested the speed in the intercoastal a while back with a hand held GPS and it showed 37 with me , my dog and a full tank of gas and I have bottom paint ..Frank

Re: prop survey
 

Not sure...I don't see any settings on the back of Tach. Boat did have a Force 150, is that a 4-cylinder? Maybe that's my problem???

Re: prop survey
 

Stock Aluminum prop on '75 135 HP Evinrude, 13x19, hitting 4800RPM max and 38MPH (GPS), two people, 3/4 tank ( 45 gallon capacity). Yesterday ordered new 13 1/4 x 17 to try to get a little more RPM's.

But, from reading boards, looks like link and sync might be all that was needed, or might need to do in addition to prop. Is that a simply task to perform?

Re: prop survey
 

Tin, what mfgr of the tach (Teleflex or who?)...there should be a slotted plastic screw-head flush w/ the back of the tach's case w/ small markings at the different settings...you might have to shine a light in there to see it...

Sfprovyn, what is tach showin' at 37 mph?...for a 150, I'm thinkin' you got some more performance that small dia. and 18 pitch prop ain't geetin' for ya...IMHO, these heavy V20s need a larger dia. prop as I tried several and got best from a 15 1/4" dia. ;) ...and keep in mind that the wrong prop will overwork the motor and shorten life, not to mention a negative fuel efficiency... :-/...

Re: prop survey
 

I dont have a tach so I dont know about the RPM's. A friend of mine told me that I would be better off if I went to 14.5 x17 in a 4 blade and I think I may borrow his to try out. Frank

Re: prop survey
 

hey i want to thank you guys for the info on the prop
i went from a 13 1/4 x 19 to a 15 x17 and just like you said no more cavitation and more speed it throse you back when you throttle up
A BIG THANKS FOR YOUR HELP
you saved me alot of cash
thanks again
now all i gotta do is fix the knocking in reverse
go to repair section

Re: prop survey
 

step...glad to hear it worked out for ya!! ;) ...you ZOOMIN' NOW!!! ;D ;D

SFprovyn...gonna be hard to tell if right prop w/ out tach... ;)...

Re: prop survey
 

You are right. I just put in an old Merc tach and hooked it up and saturday my friend is going to loan me a 15.5 x 17 3 blade aluminum prop that he has on his v-20 center console also with a merc 150..He gets around 42 and has bottom paint also. He thinks I should get 4 MPH more with the bigger prop. I'll let you know. Thanks Frank

Re: prop survey
 

That prop...you on the right track now ;) ...

the right prop?
 

i have a 5.0 mercruiser I/O and my top speed is 35 at 4200 rpms I have noticed a lot of cavitation. Anyone have a good idea about what kind of prop i should have The prop on it now is a 19 pitch. not sure what diameter but there is a little more that in inch clearance with the trim tab. Maybe a four blade thats bigger?

Re: prop survey
 

you guys keep mentioning bottom paint. does it make much difference if you have it or not? better speed?

bottom paint
 

Bottom paint creates more drag and you lose speed. You dont lose much though, about 1/2 a knot maybe 1 knot. You only need bottom paint if your going to leave it in the water. If its already on there dont take it off. Its way to much work.

Re: prop survey
 

yosh09 welcome aboard! Bill Mc ;D

Re: prop survey
 

yosh...contact these guys and tell 'em what you got and what's goin' on w/ it...they'll fix ya up! ;)

http://www.ptprop.com/

Re: prop survey
 

reelapeelin: I hooked up my merc tach yesterday and ran the 3 blade aluminum 15.5 by 17 and it was a real eye opener. Red line is 5,600 for the Merc 150. I ran it up to a little over 5,400 and the GPS speed was right at 41 MPH solid with a half tank of gas , trimmed up and just me. I am now using the 4 blade comprop as a spare. I think I am going to leave well enough alone...Many thanks for your prop advice , Frank

Re: prop survey
 

sfprovyn, GLAD to hear it worked out for ya!! ;D ...that size prop seems to be turnin' in best numbers for these V 20s w/ 150s... 8)...

Re: prop survey
 

I've got a 260hp Volvo I/O 280T with a Michigan 15x19 3 blade aluminum prop. *I feel my numbers could really be improved with a better prop, but I'm having trouble getting numbers for it. *I don't even know what my WOT rpm is. *The highest I've ever taken it was 4000 rpm, the book states 4400 for WOT, but it seems like I have a lot more to give it. *The trouble is, I hardly ever get any flat water here and the boat is coming completely out of the water by 4000. *My cruise is only 28 mph at 3200 rpm and 2500 rpm only gets me 12 mph. *I would like something that holds on to the water a little better at 2500 and would help pick up my cruise some. *I could care less about the top end, I've got no use for that. *I was looking at a 14 3/8ths x 19 4 blade stainless. *There may be a 330-350 hp engine in this boat's future as well (fuel efficiency reasons). *Don't worry about overpowering the hull, the motor will be derated from a 5500 rpm redline to 4500 which should keep me within the 310 horsepower rating for my hull. These numbers are with full gas, gear, and 2 POB.

Re: prop survey
 

18.5 dia
aluminum
5500 rpm 42 mph

i have a new rebuilt chevy 305 with a 2 barrel.......saves gas!

volvo penta 280 outdrive

Re: prop survey
 

sfprovyn - Keep your eyes peeled on ebay for

17 Merc Mirage Plus
17 or 19 Mercury Offshore (Vensura)
19 Mercury Laser2
17 or 19 Mercury Tempest

The Mirage, Offshore and Laser 2 pop up on ebay - now and again for under $200. You'll pick up an extra 2-4 mph . . . just by changing to a thinner blade stainless. These are all good designs above.

Re: prop survey
 

BS, I'm running a 14x19 Vengeance. Is that a low end SS prop?

Re: prop survey
 

Tin - Vengeance is a good prop, but it's not as fast as the Offshore, Laser or Tempest Plus.

Re: prop survey
 

http://cgi.ebay.com/ebaymotors/Mercu...QQcmdZViewItem

This would be good for someone with a 150hp Merc or Yamaha.

Re: prop survey
 

After hangin' on the Honda, I tried a Merc Mirage 15 1/2 x 17...GREAT performance, but a little too heavy and caused a rattle in the gear-case...would probably turn in good numbers on the 150 Merc on a V-20... ;)...

Re: prop survey
 

I'm with Big Joe, 1980 175 Evinrude and I run a 15 X 17, I do mostly off shore fishing and have never really been that concerned with top end. What I like about the 15 X 17 is that it is more of a power prop, I can set the throttle and the trim and push my way solidly through a 3 foot sea without any slippage and a fairly smooth ride.

Re: prop survey
 

what speeds are other getting with 200 HP O/B motors.
I'd really like to know what speeds you all are getting with 225 hp O/B motors

Re: prop survey
 

ok bump this will help save time on the v20 performance question

Re: prop survey
 

'73 Center Console

Original motor
Evinrude '75 135hp
max speeds
4900 RPM @ 35 MPH 13x19 SS (old beat up prop)
4600 RPM @ 31 MPH 13.25x17 Alu (new $130 Mich Wheel)

Upgraded motor to:
Evinrude '83 175hp
original old prop SST 14-1/4x21 4500rpm @ 43MPH (max)

replaced with $50 ebay prop, 15x17 SST II
tops out fully loaded at 43mph (GPS) @ 5400rpm
normal cruising speed of 30mph @ 3800rpm

Keep in mind when comparing numbers, the hp rating change in '84/'85 means this 175hp would be about the same as an '85 and newer 150hp.

Re: prop survey
 

'85 V20 Cuddy
'90 225 evinrude
14 1/2 X 19 stainless
5500 max rpms
3800-4400 cruise
guestimate 50+/- mph @ WOT

Re: prop survey
 

man i'm so glad to see them results Brad great that's the same setup i and building currently glad to know my prop is close or right.

Re: prop survey
 

Those results are an educated guess. I don't have a gps and you can't trust a boat speedometer. I've owned and been on several boats and it does seem to haul a$$ for as heavy as she is. I try to lighten the load as much as possible only carrying necessary gear, but I always have a full fuel tank.

bump

What a thread. Goes back a ways, what you thinkin Skools?

This is all I got.
http://www.wellcraftv20.com/communit...ad.php?t=12543