User Tag List

Thanks Thanks:  0
Likes Likes:  0
Results 1 to 9 of 9
  1. #1
    Join Date
    Aug 2011
    Location
    Colorado and Florida
    Posts
    4
    Thanks (Given)
    0
    Thanks (Received)
    0
    Likes (Given)
    0
    Likes (Received)
    0
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Propping a Merc 300xs on Lake & Bay Boca Grande

    First off, I previously owned the same boat ( a Lake & Bay 20' all kevlar boca grande w/ pocket drive hull approx. 900lbs.) with a Yamaha 300 HPDI and had the boat props dialed in with a top end of 91mph from a basically stock motor. Can anyone give some advice on what prop will turn out the best top end for this same boat rigged with a 300xs. I was wondering if I could get away with one prop that will turn out the fastest possible top end and at the same time create excellent hole shot and mid range speed/feul economy, or am I going to be using two props to cover my urge to haul ass and fish wit a full load all in the same day. I was also planning on adding a Dave Bush kit (velocity stack, ecu reprogram, and lightening of fly wheel) which would take the h.p./torque both to 325 and raise the rpm's to 6800 from 6400, would that change the prop selection at all for my speed application? I would greatly appreciate if anyone could offer their help on these subjects, thank you all.
    Last edited by L&B44MM; 08-27-2011 at 02:32 AM.

  2. #2
    Join Date
    Mar 2008
    Location
    Tourist Trap, Florida
    Posts
    9,271
    Thanks (Given)
    124
    Thanks (Received)
    436
    Likes (Given)
    1575
    Likes (Received)
    3106
    Mentioned
    2 Post(s)
    Tagged
    1 Thread(s)
    What prop was on the boat when it had the 300 yami on it? Merc makes a 4 blade prop just for the XS line of motors. I hear good things about their all round usage. A lightning ET might give you the best top end when light. I have a 1000# flats boat that has a 225 opti on it and it runs 83 mph with a 28 lightning. For fishing I use a trophy plus 26p for a fully loaded top end of 74mph.... More slip than the ET, but planes out good and gives great midrange fuel econ..

  3. #3
    Join Date
    Sep 2002
    Location
    Jax,FL
    Posts
    2,000
    Thanks (Given)
    1
    Thanks (Received)
    5
    Likes (Given)
    2
    Likes (Received)
    63
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Welcome and let me start off by saying nice boat ( post a photo or two ). Im actually surprised I haven't owned one yet myself. To compare the yam and merc is prob not fare to either as Im sure they have different gear ratios. Either way, your looking for the magic prop and as far as I know, everyone is still working on it A " fishing " load ( call it an easy extra 700lbs ) is going to put a dampner on your " hauling azz " performance. Especially if you start with a prop that is great on the big end. Fill up the boat, put one of your " bigger " friends in it with you, cooler full of beer/food, a livewell full of bait, all your gear and then find a good 4 blade for THAT load ( Hydromotive , Trophy, Bravo 1 ( with PVS) ect ect ) a nice big blade wheel should give you enough lift to carry the bow, hold a better midrange and give you the holeshot you are looking for. But when you dump ALL that stuff and want to fly your going to be all over the limiter...... so then starts the process of finding a haul azz wheel as you put it. 2 props is good and really the way to go. Gives you a spare ( NEVER a bad thing to have ) and the ability to go faster when you want. Just my .02

    PS- I would probably wait till after you do the DBR upgrades to dually prop the boat. But that's just me.

  4. #4
    Join Date
    Aug 2004
    Location
    Venice, Florida
    Posts
    9,630
    Thanks (Given)
    22
    Thanks (Received)
    105
    Likes (Given)
    402
    Likes (Received)
    708
    Mentioned
    0 Post(s)
    Tagged
    2 Thread(s)
    Call Ken at PropGods. I am almost positive he has done prop testing on the combination. You can search his forum for the results but I would call him as well.
    www.propgods.com
    13' Biel tunnel AKA "Flight Risk"
    13" Modified Yamaha V4 - 101 mph

    21' Paramount
    Mercury 300 Promax

  5. #5
    Join Date
    Sep 2008
    Location
    Treasure Island Fl
    Posts
    1,150
    Thanks (Given)
    0
    Thanks (Received)
    4
    Likes (Given)
    2
    Likes (Received)
    18
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Clockwork Orange View Post
    Welcome and let me start off by saying nice boat ( post a photo or two ). Im actually surprised I haven't owned one yet myself. To compare the yam and merc is prob not fare to either as Im sure they have different gear ratios. Either way, your looking for the magic prop and as far as I know, everyone is still working on it A " fishing " load ( call it an easy extra 700lbs ) is going to put a dampner on your " hauling azz " performance. Especially if you start with a prop that is great on the big end. Fill up the boat, put one of your " bigger " friends in it with you, cooler full of beer/food, a livewell full of bait, all your gear and then find a good 4 blade for THAT load ( Hydromotive , Trophy, Bravo 1 ( with PVS) ect ect ) a nice big blade wheel should give you enough lift to carry the bow, hold a better midrange and give you the holeshot you are looking for. But when you dump ALL that stuff and want to fly your going to be all over the limiter...... so then starts the process of finding a haul azz wheel as you put it. 2 props is good and really the way to go. Gives you a spare ( NEVER a bad thing to have ) and the ability to go faster when you want. Just my .02

    PS- I would probably wait till after you do the DBR upgrades to dually prop the boat. But that's just me.
    I agree with Adam.... I have the same boat pretty much. I run a worked up 26 bravo when fishing and a 28 chopper on the limiter for the big number. Mine is stock with 1.62 sporty. Your hull might be a bit lighter than mine, you might try a 29 tempest or a 30 chop or ET for the big run. The bravo is a great all around wheel when done right. IE. Cup, big vent holes, flare ring removed. I run it more than anything. http://www.youtube.com/watch?v=-ZkhAKJvl70
    Cawley

  6. #6
    Join Date
    Aug 2011
    Location
    Colorado and Florida
    Posts
    4
    Thanks (Given)
    0
    Thanks (Received)
    0
    Likes (Given)
    0
    Likes (Received)
    0
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks for the reply. To answer your question, I actually had four different props on the shelf for this boat. My favorite of coarse was the custom cut 29'' prop almost identical to the lightning e.t. which was made special for the boat, this prop didn't want to come out of the hole with less than 5k rpm and would slip like hell unless you eased into plane for about 7-10 seconds, but it would eat it up with the jackplate (Bob's 10" setback) lifted up 2&3/4" which is half in/out. The favored all around was the Trophy Plus 28" 4-blade, it was somewhat slippery out of the hole with massive loads, but mid-range and top end were great. It gave the boat good bow lift with heavy loads and peaked out @ 84mph w/ no load, loaded @ 74mph. I also had a Tempest 3-blade 29", however this prop really didn't perform for me that well showing only 81 top end and slipped in midrange and slow speed in rough water with a slight trim on the jackplate. The last was a 4-blade Power Tech which I was not pleased with either. I only ran the first two after the first month.

  7. #7
    Join Date
    Aug 2011
    Location
    Colorado and Florida
    Posts
    4
    Thanks (Given)
    0
    Thanks (Received)
    0
    Likes (Given)
    0
    Likes (Received)
    0
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    About the boat pics...I wish that I had some to offer. My computer had a melt down and all the pics(over 50) went down the tube. I'm trying all avenues to recover some photos and will throw some up if I find some.

  8. #8
    Join Date
    Jan 2008
    Location
    AR
    Posts
    55
    Thanks (Given)
    6
    Thanks (Received)
    1
    Likes (Given)
    2
    Likes (Received)
    4
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I have a 20 ft L&B Kevlar Bocagrande with 2005 Merc XS. 3 batteries up front and 1 large Sears platinum AGM. Suggest you be in contact with Mark Croxton. He makes Razor props. I have run Fury's, Tempest plus, Bravo 1, Bravo 1 XS and now the Razor 4 with 8 pvs holes. On my L&B the Razor 4 gives the best hole shot and top speed. B1 XS is second. The Razor props are very beefy and stiff. My experience has been that Croxton has guided me well.

  9. #9
    Join Date
    Aug 2001
    Location
    Chico, Calif.
    Posts
    110
    Thanks (Given)
    4
    Thanks (Received)
    1
    Likes (Given)
    0
    Likes (Received)
    0
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I agree that one prop is never enough. If you ever run at higher elevations you will need to prop down for that as well as heavier loads when fishing. You might try a Chopper ll if you ever get a chance for your fishing prop. The holeshot will be good for that 300XS plus the mid range will be exceptional. I would favor an over the hub prop for getting out of the hole with that motor since they don't send that much exhaust out the bottom. The Chopper ll may also out perform the trophy on the top end.
    Last edited by Badbait; 09-25-2011 at 04:07 PM.

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Bob's Machine