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Took the old girl out Sunday for me and my lady's 6 year anniversary. Went down from the family river house in Dawson's Creek and put in, then went down to Oriental N.C. There was a nice chop on the river with some white caps. First time I had her (the boat) in a little ruff water. She preformed awesome! On the way out a Wildlife officer did a turn around on us, I told the lady not to turn around and look at him and I dropped the handle. Once I made it under the bridge and into the river a little ways (out of his jurisdiction) I stopped and turned around to see if he came after me and by this time he was already turning around at the bridge heading back up the creek. Even with one motor on the 27' he couldn't catch up to me. I wasn't doing nothing wrong so I turned back to see what he wanted and he never looked back to see that I returned to give in. Looks like he went back up to the ramp to wait for me. To bad I didn't use the public ramp! The only other ramp on the creek is private and just happens to be at our family river house and he didn't know I wouldn't come back his way. I think he didn't like the F.L. reg. numbers on the boat. I got it registered but haven't got the numbering changed yet. I cant wait to get the second motor on the boat, much more fun then when she will hit 65 mph +
Did manage to catch a few fish on the way back in. A few flounder and one nice trout over 18"! http://www.classicseacraft.com/commu...pictureid=1045 |
Nice job, friz. Next time, take a GoPro so we can hear and see some action!
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New Props
Now that it is warming up a bit I have been on ebay,ThT and gotten a few new to me props to try out on the old girl before I pull the outboard. I will be moving it to the 20' sceptre once it is done but wanted to play around with it before unrigging it due to it may be a year or two before it will run again.
What I got on it now is a Quicksilver S.S. 14.5 x 17p which is tacking too high rpm wise. What I got to try is a Mercury Mirage Plus 15.5 x 17p Mercury Mirage Plus 15.25 x 19p Older NIB Mercury 15.5 x 21p Mercury Rev 4 14.625 x 17p If all goes well and the last 2 come in before the weekend I might try to make a few runs and see what kind of numbers I get. I will post the findings. Hopefully GFS this may help you moving forward when the time comes and gives me an excuse to run her before I pull the motah... |
Mercury Mirage Plus 15.25 x 19p I have a feeling that this is gonna be your prop.
based on my experience the mirage plus 17P and the 14.5 x 17P quicksilver's turn about the same RPM. Mirage Plus will have less slip and be a little faster. |
Lordwrench, thanks for the offer but I got ebay bid happy and ended up with a few. Got most of them for around a $100 but the rev 4 it was a bit higher but most nice 4 blade props are. I wasn't going to get a 21p but that one was only $60 and it was new in the box still just an older style prop a torq flo where the others were torq flo II with removable sleeve bushings.
Bigshrimpin, That's what I was guessing (19p) after reading a lot of post up here, seems like that is what most people run on their 23's. Curious on the rev 4 four blade once I get the motor on the bracketed 20' sceptre. I think it will need the lift in the rear. |
From what I remember you can run the rev4 a little higher (1 hole) than the mirage plus and it'll still hold better in turns. The mirage plus is faster than the rev4 of same pitch.
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That's what I was told, that the 17p rev 4 would be similar rpm range as the Mirage 19p. I know most of the time going from a 3 blade to a 4 blade you go down a inch of pitch to get similar effect and rpm. We will see!
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If you need stearn lift the Rev 4 is great, if you don't you will hate it.
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Crap
Well, on the way to work this morning I drove my diesel truck so I could get the plates renewed and the damn thing left me on the side of the road. Fuel pump sounds like it is getting air in it or ?. Just sounds different, I checked the motor mounted bowel and it is flowing fuel but it will only run for 30 seconds and cut off again every time. It is always something, might not be able to tow the boat this weekend for prop testing after all. The bad thing is I was about to take off up north to pick up the 25'. Glad it didn't happen 800 miles away but crap. It is always something....
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I think that I will be committed to bringing the race boat back more original instead of leaving it a center console. I want to go back with a full cap like it had but still would like a little more room than the two man original set up. So, I though about how Carl would of done it if he was building it. I would like to go full race with the hull but would want to still carry me the old lady and a guest or two and have more room than a small hole to sit in. Thats when I saw the scampi Pic's for the third time today then it hit me! If I redo the cap like the one on the scampi but a little deeper in the cockpit where I can have a pair of seats in the front and then a set of three in the rear that might be cool. It would keep the race look but still be useable. What do you guys think????? I took the scampi pic and stretched it out to the 27.6 feet that my hull is and I'm likening the look.
Picture of the scampi stretched out to the race boat length: Attachment 6861 Rear seats to go in it: Attachment 6862 |
Kinda like a hybrid Seavette/27 Race - I really like it!
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Funny story about the wildlife ocifer. In the mid eighties, I had a Moto Guzzi 1000 Lemans. Heavily worked. Branch heads. Venolia slugs,B1 cam, 44mm DeLortos, Bub pipes etc. Had a cardboard tag on the back which read SEE YA. Got a ticket in the mail for 40 points. First charge was attempting to elude. Crossed it out and plead not fair. It was a long winter driving the old Volvo wagon in Vt... The second summer Windsor county bought not 1 but 2 KZ 1000`s. Nobody taught em how to ride though. Of course there is more to the story. Frizz, would love to see more numbers. I was talking with the folks at 7 Marine at the show this year. They have a dual prop LU now...and I may have made mention of a possible trade for test mule marketing in exchange for 1040 lbs of Detroit muscle. Insanity, I know, Cheers, GFS |
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They are freekin huge. They cherry picked the best of merc racing engineers and it shows.
The LU is a #6 race unit. ZF trans. Closed cooling. Said they are selling a bunch of em. Good for them. |
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Got the truck back going and took the boat out for some prop trials the past weekend. I tried the 15 1/2 x 21p first and could not get over 5200 rpm and a max speed of 40 MPH. So I jumped to the 17p rev-4 next and was in a better rpm range. The original 17p had been reworked and was more like a 15p and that threw me off to start with. I was thinking I was going to need a 19p or 21p but not the case. I learned that the 17p was best for this combo. The Rev-4 and Mirage Plus both worked well but need to rerun the rev-4 now I have the motor mounted higher up. I had a 48-16314 - 14 1/2 x 17p that was shooting over 6000 rpms and that made me think that the 17p was not enough Pitch. Well after looking at it once it was off there was 3 different markings from prop shops. Im guessing this one was changed to a 15p or reworked to turn higher rpms than a standard 17p. The Mirage plus 48-18278 15 1/2 x 17p done real well. Five people on the boat loaded as I will ever be I could get 5700-5800 rpms. The Rev-4 I could get around 5600 rpms. The top speed on the Mirage was 46 MPH @ 5800 rpm where the Rev-4 17p would only do 43 MPH at 5600 rpms. The Mirage cruse speed around 3800-4000 @ 37-38 MPH was better than the Rev-4 as well. The rev-4 had the full plugs in the vent holes and the Mirage had none in the holes at all. The minimum plane speed was bad with the Mirage. At 3000 rpm it would barely hold plane and it was around 25-27 MPH, but once the vent holes would start venting (10 seconds after holding 3000 rpm) the rpms would go from 3000 to 3300 and it would drop off plane. I thought it would help but it dose not far as plane speed. The vents open do help taking off from a dead stop tho. I would like to try full plugs or small hole vent plugs next to see what that will do. The rev-4 was tested the first day and the motor was way low. I raised it up for the second day 3" higher when I done the Mirage 17p testing so I want to retest the rev-4 to see what it will do up higher. With the motor low it would do well and hold plane at 27 mph at 3000 rpm easily where the mirage would not. Had a lot less bow rise with the rev-4 and better stern lift. The cruse was good at 3800-4000 rpm @ 32 MPH and it had little slip and was a fast smooth accelerating prop. On the way back down the river after we stopped to eat it was ruff white caps at 10 foot intervals maybe 3-4 footers running with a following sea with the wind to my back and it held the boat on plane well and did not slip at all even when we were up out of the water some. She did not do well under 30 MPH but above it she stayed on top and skipped across the caps and did not beat at all and that stopped the digging from the following sea. Even below 30 mph she did dig a little but even then the spray rails worked well and all the water sprayed outward and not much spray came back on us. It may in a cross wind but done well this day. I have not tried the 48-13700 151/4 x 19p Mirage yet and may do so now with the motor raised and with a lite load just to see but I will do the same run with 5 head with the Rev-4 17p with the motor up just to see my difference the 3" raise made. I know they are more of a semi surface prop so it should be better. The motor needs to go up a few more holes but it is maxed out now where it is so I will keep that in mind when I move it to the scepter 20'. I'm sure it will take a different prop on thee 20'vs the 27' but it has been fun running the race hull some and gave me a chance to do it before I start tearing it apart for the redo. We even caught some fish too. I got a 20" drum and a 14" flounder Sunday evening. I will probably run it once more just to take it out one last time and see what the differences make and then I will Post a final chart of all the prop performances and make it a little more readable than this.
Few Pics of the trip out: Attachment 6920 Attachment 6921 Attachment 6922 |
It may sound counter-intuitive, but sometimes a planing fin such as a Manta, or Doel-fin, or a low mount HydroShield can help with the low-speed planing issues and hole-shot. The ones that mount on the ventilation plate are completely out of the water at higher rpms's and thus no hindrance to top-end performance (with a motor properly mounted).
On my 23 Tsunami with a single '87 225 Johnson, adding a Hydro-Shield dropped my minimum planing speed from 23 mph to 17 mph, and even though it mounts low (on the skeg) my top-speed actually went from 36 to 38 mph because of the added stern-lift. With trim tabs I think I could have gotten minimum planing speed down to 12-13 mph. |
It's tricky to get it all dialed in . . . Sounds like you are just about there. I am curious to see how the numbers end up with the rev4 17p and the 19P Mirage Plus . . . now that you've raised the engine up.
That 3.0L is way too much motor for that little 20 sceptre :) |
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That is as long it dose not chine walk and there is enough flotation on my bracket to keep the tail end up. Edit: changing the 3.0 to a lighter 2.5, it did keep the tail end up with the flotation bracket but also chine walked at around 63 mph and got a little scary, more power and torque than it needed! |
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Let me know when the time comes, I would love to have that on the 20'sf cc
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Up Date
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Been a while since I posted on the ol race hull, for all of you that wonder the progress on the hull, still haven't dived into it yet with the sawzaw but just about got all the parts I need to make it run like it was made to do. I got two 2.5 blocks that I am cutting into steel bore 260's spec. that should make 500hp for the pair no problem, I got several offshore mids with the exhaust snouts to let her talk and I got a deal on a pair of sportmaster lowers too. I stopped by my guys shop that builds the racing outboard to get the blocks worked on and the cylinder porting done and came across a pair of 225 promax 225 from mercury racing. They have been modified with svs intakes and should put out around 240hp each. I ended up getting a heck of a deal on them and some other stuff so I may hang them while the second pair of power heads are getting cut and modified. She should scream! Mid 70's in this boats future. I got a lot of glass work to do to get her prepped and ready but now that it is getting warm out I am going to get on it soon.
Attachment 10107 Attachment 10108 Attachment 10110 Attachment 10111 Attachment 10113 Attachment 10112 |
Sweet!!! I can't wait to see the end result. Where did you find all the Merc Racing stuff?
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Frizz I bet you have got the juices flowing for GFS!!! Sandy needs to quit slacking and pick up the pace on his 26' Race boat!! I'm thinking he needs to get that new 627 hp Marine 7 on order for his project and catch up with you!!! :)
Nice pictures!!! |
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So we are having a summer storm here and as soon as I read your post... Boom, lightning and thunder blew our power out for a second. TV and LT went radio silent. An omen I tell ya. Did Noah run Mercs or OMC`s? I`m thinkin Mercs. Sweet score there. I`m afraid to ask what you stole those for. So far I have a leaning post, bimini, fully rebuilt Hynautic helm and ram, 10 gang Ventura switch panel and a hankerin for a brace of G2 250 HO`s. 1200 ft lbs of torque. Yum. We can dream right? Saw a bracket for a great price, but some of the welds were cracked. Is everyone reading this thinking sell your damn 20 idjit? I`ve never met anyone who did not regret selling one. Or an 18. |
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