OB17 - Northern Virginia

[Reid]

Charles,

Glad to see you were able to get on the water this weekend. The OB17 looks great! Don't be surprised if one of these pics makes it on to the front page of the website in the future!

-Reid

[pee wee]

Congratulations on a fine build. The boat looks great and it sure runs!

[peter-curacao]

Boat looks great

[narfi]

Looks like a great boat and lots of fun!

[csaroka]

Thanks! We had a great time for the few hours that we were out on the water. Although I had a bearing buddy pop off the trailer on the way to the lake, which resulted in 1 hour delay detouring to AutoZone, there were no problems with the boat itself. Found some smooth water and took the boat to just shy of 50mph before backing off; there was certainly some left in the throttle but that's for a different day.

On a separate topic, I need to order a capacity tag for the boat. To do that, I need to calculate the Maximum Weight Capacity, which requires the Maximum Displacement as input to the formula. Looking over the OB17 design documentation, I can only find the Displacement at DWL. Is there a way to convert the Displacement at DWL to Maximum Displacement? Calculating the Maximum Displacement using Simpson’s Rule appears to be a rather manual and tedious formula; does anyone already have this information on the OB17 or can the designer automate the calculations software? Maybe there is another way to do it but I am referencing: https://www.uscgboating.org/regulations ... OADING.pdf

[jacquesmm]

For the capacity tag:
I posted a lot about that in essence saying that you do not need it.
See my last post here:
https://forums.bateau2.com/viewtopic.ph ... ag#p410861

I have calculated them for some boats that are built professionally but I don't know if I ever did it for the OB17.
I will post the values here but you must be patient, it's a free service but I give it low priority because the tag is not required.

PS: don't waste your time doing those calculations, my software does it automatically but in some cases I have to edit the 3D model which takes time.

[jacquesmm]

Got a clean model and the max, displacement per ABYC rules is 8,970 lbs.

If it looks ridiculously high, read my comments about this in several places on the forum.
The reason for that very large displacement is the existence of the motorwell bulkhead. I design very safe boats and always put a high MW bulkhead in front of the splashwell.

I"ll put that in the spreadsheet now, give me a minute.

[jacquesmm]

Here it is with max. HP 80 for a boat built exactly as designed.
Max. total 1714 lbs
Max. persons weight: 1309
Max. persons: 7.11

That is very conservative because I did not trim the boat and put the flooding point low. I could get more than that but anyway, read the thread referenced above.

For the tag, I propose:

Max. total 1570 lbs
Max. persons weight: 1200
Max. persons: 6

I also did with a 125 HP, less calculated values but same final output

[csaroka]

Many thanks, Jacques! That helps a lot!