Andy Greene
Well-Known Member
- Joined
- Feb 24, 2006
- Messages
- 10,092
Just wondering outloud if any of you guys have played with a .67 in a 38 inch-.45- Seaducer SD3 ??
Were would you start prop wise ?? For a saws type application of course . Common start with the .45 boat/motor combo is a 450/3 configured to desired spec. Were would one start with a .67 in the same boat ?It is very common in SAW to use a cut down or smaller hull for a particular engine class. This logic will not work for racing, as the hull will be way over HP'd and will likely get a bunch of DNF's. Also during SAW trials, the water is typically much flatter that churned up race water, and course corrections to avoid other boaters are non-existant.
Thanks for the input John, If you dont mind me asking , what hull were you using and what size /weight was it ?? 4 Mono records with one hull is impressive....X series props don't cut it for straightaway. They accellerate quick but top out to fast. They act as a governor as the front angle that enters the water is not aggessive enough for higher speeds. 14 and 16 series are better for straightaways. At one time I held the 20, 40, 60, and f mono impba records all at the same time with the same boat. I just changed engines. It was smaller than the boat you are talking about, so you can make it work for record trials. Don't try to heat race it, or you will be disapointed.
I will have to go back to my notes as it was a long time ago. I remember I was running 86 mph on the stalker with a CMB 67 but didn't follow thru with the record attempts with that setup because I switched to riggers to work on the 100 mph goal with a hydro. While I was working on the hydro stuff Jerry took all the mono records except the 20 mono. Kentley porter kept me focused on the 20 because of our team efforts. I need to re-visit those days. I will look up the info in my notes when I get home later today and then post the information for you.
ok, found my notes from November 97. It was a 33 inch boat. It was a 46 inch Twin Craft that I cut to 33 inches in length. I put a wood deck on it and the sides were only 1/2 inch high. The transom was in tact because I took the length off the front of the boat. I used a CMB 67 with a mac 13 cc pipe at 10 1/4 inches from the center of the engine to the widest part of the pipe. I used an H-22 prop with a lot of cup at the trailing 1/3rd of the blade. The rudder was 2 inches deep into the water. The prop drive dog was 3 5/8ths from the transom and the rudder was just to the right of the prop and slightly ahead of the prop. The rudder was tilted 4 degrees to the right. Prop pitch was 3.8 and top speed was 74 mph. The 86 mph runs I got later that month were with a different prop, but my notes jump right into the hydro testing in this book. I will check some of my other books after dinner.
Dinner is over. I found another book. 7 1/2 lbs ready to run less fuel. In 1995 It was going 75 mph with an ops 65. Same boat. It was the first mono to set an IMPBA record over 70 mph June of 95 in Elmira N.Y. with an ops 45 engine and an Irwin quiet pipe. Used a 1455 prop and weight was 7 lbs even. Well, it was a nice trip down memory lane. Good luck with your project.
I was thinking of the X4xx series for oval racing, sorry. I de-tongue the X series props to remove the speed limiter. (makes them like the M series). X6xx series for SAW.
Yup, from now until December 26th we refer to John by his holiday nickname- Griswald. John says they've scaled back some this year, I figure I'll know in a couple weeks when dusk hits. If my house lights don't dim when all his automatic timers throw the juice to the exterior decorations and there isn't that sub atomic glow off in the distance towards his house I'll know he was telling the truth. :lol: :lol: :lol: :lol:.......Those are elves racing the 42 inch twincraft and cracker box in my front yard. We are one of those who spend weeks decorating for Christmas. The only boating at our house between now and Christmas is what you see in the photo.
So would the Astronauts on the Space Station see it?Yup, from now until December 26th we refer to John by his holiday nickname- Griswald. John says they've scaled back some this year, I figure I'll know in a couple weeks when dusk hits. If my house lights don't dim when all his automatic timers throw the juice to the exterior decorations and there isn't that sub atomic glow off in the distance towards his house I'll know he was telling the truth. :lol: :lol: :lol: :lol:.......Those are elves racing the 42 inch twincraft and cracker box in my front yard. We are one of those who spend weeks decorating for Christmas. The only boating at our house between now and Christmas is what you see in the photo.
Not "Deck the Halls" movie stuff. Just somewhat Grisswald.So would the Astronauts on the Space Station see it?Yup, from now until December 26th we refer to John by his holiday nickname- Griswald. John says they've scaled back some this year, I figure I'll know in a couple weeks when dusk hits. If my house lights don't dim when all his automatic timers throw the juice to the exterior decorations and there isn't that sub atomic glow off in the distance towards his house I'll know he was telling the truth. :lol: :lol: :lol: :lol:.......Those are elves racing the 42 inch twincraft and cracker box in my front yard. We are one of those who spend weeks decorating for Christmas. The only boating at our house between now and Christmas is what you see in the photo.
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