Thanks, Ron. Technical articles available here: aeromarineresearch.com/performance_articles.html
Type: Posts; User: Jimboat; Keyword(s):
Thanks, Ron. Technical articles available here: aeromarineresearch.com/performance_articles.html
A sad day in powerboat history. I just heard that Bob Switzer, hero and friend, passed away on Friday December 29, 2017. A true hero. Will be remembered as one of the really true innovators,...
here is an article on 'Rooster Tails'
Sounds like a fun project!
Update - TBDP/VBDP performance software Version 8 now includes spray rails, lifting strakes and trim tabs. (plus a bunch of other new features!)
Spray Rails are normally on chine/sheer and can...
Yup, for sure! Sounds like you're much too low. Raise motor, make sure you're still getting water (get a pressure gage). Test for new surfacing props.
Joe - true enough. As i suggested, nearly every hull design is a "compromise" of many performance desires/expectations. Given an existing vee hull design of weight/size/power - the best pad design...
Every hull design/setup has an optimum pad design (width, length, depth) for the desired performance expectations. The tricky part of the design is that the characteristics change at each velocity...
nice boat! if you size the pad correctly, it should be a winner!
no problem, chris. give me a call or PM me, if you want to discuss.
/jim
The size of the pad should be designed so that it's sufficient to provide greater portion of dynamic lift of the hull. A wider pad is more efficient, but also harder ride. Hulls with high deadrise...
1. what is your rpm currently, vs. max rpm of engine?
2. can you send me a picture of your hull running at current top speed?
Nason - sorry to avoid the 'quick' answer...to make performance assessment of your 2 boats, we'd need details of each design, and power/weights for each setup, and would then do a dynamic performance...
Agree completely with Yellowjacket. A pad can really make a vee hull fly. Each pad should be designed particularly for the hull, power, setup and expected use (speed), however. If not enough pad, the...
The sizing of a pad can be designed for the specific hull dimensions, weight, HP, etc. (Duplicating a pad from one hull on a different hull might not work out as well).
A proper pad design...
Looks good! is that the tunnel design that we corresponded about recently? The modelling we did showed some good results. Glad that the testing is showing same. Send me some details of your...
Sam - this must be one of the very first hydraulic trim systems! who do you credit with inventing it?
what year of manufacture do you think that trim piece is, Sam?
zul8tr - yes. you're right. I've corrected the website (typo). I am not sure which version of TBDP software you have, but your TBDP User manual reflects proper info (but no typo!). thanks.
Just give...
Sure...
Velocity Optimize – [Trim Angle specified, Maximum Limiting Velocity determined] - use to get an estimate of the velocity that is achievable at a specified trim angle (WAngle) OR (with...
Mark - your new design looks very innovative. i'm glad that the TBDP software has worked so well for you. Your hull is a great looking boat! Good work!
I note you're using an "s-shaped" aerofoil...
OMC factory tried cool cans in U-class boats in 70's on V4's. They used dry ice in an aluminum can, with fuel running through a coil inside the can. i don't really recall any of the other details,...
Barry - WOW! You're a real detective. that should be sufficient info. thanks a lot!
Boy! I thought you'd get it for me, Ron. The boat was originally in Ohio. The owner said the company that made it made only 2 of them. Current owner is trying to identify the maker. It is...
Does anyone recognize this hull? builder?