Fuel Numbers for my "Speed Demon" (not)

[PipeDreamsMarine]

Hey guys.. I just pick back up on this post today.. Miles..., [img]images/icons/shocked.gif[/img] Make that case of beer Coor's Light long necks bottles. please. It's looking like your gonna be at 16x15 when you done.. Right where I thought.. [img]images/icons/tongue.gif[/img] lol .. Jeff you wheel sounds a bit to fat right now, did you get the pitch out of it yet?

[Miles Offshore]

Don, I was hoping you were just ignoring my dumb @ss,lol.Right on the money were you . I am guessing with as crappy a weather we have been having instaead of fishing another boat I might get her changed the weekend . I have learned something though. It doesnt matter how frequently you change your wheel,it is still a son of a beetch to get off every time. Coors light ,huh??? No problemo, you can pick em up when you come down and go rockfishin with me this winter. Big boyz are just starting to show up. Offshore has been hot when mother nature allows anyone to get out.(White Marlin that is.)see-ya-craig

[Miles Offshore]

OK- here is my brain, ............- put the revamped 4 blade 16/15 no cup back on today. Still have a hum but now at 700 rpms only- gone at all other speeds. Its going to have to be tolerable now. Speed numbers-
3000 rpm's, 19.5/20knots 10.4 to 10.6 gph. [img]images/icons/smile.gif[/img]
3200 rpms, 21/22 knots 11 to 11.1 gph [img]images/icons/smile.gif[/img]

3500 rpms 24 knots 17 gph [img]images/icons/rolleyes.gif[/img]
3800-4000 rpms 24.1 knots 18.5 gph [img]images/icons/shocked.gif[/img]

All on a crossing over tide with only a slight breeze

whadda y'all think ?

Pretty happy except for that damn humm. Think I might have hit something on the way in.Everything seems to be alright. Was tog fishing yesterday in my friends old 23 formula and we hit a 2 x 4 on the way in. Lots of crap from Isabel still floating around.2 x 4's, 4 x 4's, piers, telephone poles, you name it.sux. 3000/3200 is my normal cruising rpms , glad to see the numbers look good, better than what I expected

[omaier]

Miles,
I am surprised you didn't get any more at the top end (3800 - 4000). Assuming 10% prop slip your boat should hit 30 knots as set up [img]images/icons/confused.gif[/img] . I know a 4 blade loses some speed compared to a 3 blade but I didn't think it was this dramatic.

[GetReel]

Craig, as Mike noted, what happened to your top end? Seems like yout not turning up? Maybe I'll go 16x16 with a five degree cup [img]images/icons/confused.gif[/img]

[Miles Offshore]

My top end numbers are probably not real accurate so take them with a grain of salt. I hesitate to leave it running wot for long period of time even for the gps to catch up. I also think that I am not getting /or am losing several knots because of the keel guard on my boat. There is not a smooth transition forward where it is bolted thru the boat and the whole thing doesnt really make aerodynamacilly (sp) smooth flow possible. I'm certain thats why everyones numbers are better than mine.Another thing I noticed yesterday is I have some play(wobble) in my rudder(oversized). Hopefully I can get rid of the wobble by repacking it?? If there is wobble Im thinking that is giving me even more resistance slowing me down even more?? I toyed with the idea of removing the keel guard this past spring but after some thought figured that it is a better idea to leave it on and protect the running gear and lose a few knots.

Jeff if you put cup in it arnt you defeating the purpose of taking the pitch out???

yall might have seen these before but this is what I mean-the first picture you can see the blunt edge that sticks down an inch or so that is definitly in need of some kind of fairing in. The very back part of the foot also has a lot of drag Im certain because it is not totally stationary.





heres one with the 4 blade on it right after hurricane isabel-notice where the tide level is


[ November 03, 2003, 07:51 PM: Message edited by: Miles Offshore ]