Search found 78 matches

by Jones
Wed Jun 18, 2008 4:44 pm
Forum: Miscellaneous
Topic: INSURANCE QUESTION
Replies: 8
Views: 2199

Hagerty Marine... ask for Kelly McCann, she's a senior underwriter. Absolutely the best insurance company I've dealt with on the custom and/or classic boat scenario and they regularly visit this website to view builds. (other companies told me "no way... your BoJest is a KIT boat) I have never had a...
by Jones
Mon May 19, 2008 12:32 pm
Forum: Epoxy
Topic: Probably a simple Question
Replies: 11
Views: 3751

newbi2008 wrote:
Cheers, very soon ordering the CS-20 plans.

But going to modify it slightly.
I'd encourage you to order and read Glen's Boatbuilding With Plywood text before making modifications. Certainly, they are yours to make, but you may gain a few insights about proportions.
by Jones
Mon May 19, 2008 5:51 am
Forum: Epoxy
Topic: Probably a simple Question
Replies: 11
Views: 3751

Re: Probably a simple Question

Also, i've seen alot of posts about epoxy breaking down in sunlight if not protected. i intend to paint my entire hull, does this eliminate the sun light problem? True, epoxy is not UV resistant and yes, painting/varnishing will prevent the damage. As for your question about fiberglassing, it's goo...
by Jones
Fri May 16, 2008 12:33 pm
Forum: Miscellaneous
Topic: Another Engineering Question
Replies: 4
Views: 1452

Bill Edmundson wrote:That flex is shock not going to your boat when you hit that pothole.

Bill
Agreed, it does look "comfy" for the boat... not to mention that I dropped down to 1500# springs on both axles. They give some, but are predictable.
by Jones
Fri May 16, 2008 10:03 am
Forum: Miscellaneous
Topic: Another Engineering Question
Replies: 4
Views: 1452

Let me clarify: Only a part of the trailer is showing much flex, specifically the unreinforced span of C4*5.4(x2) main rails from the most forward cross member (shall we call it station 4) and the cross member whereby the tongue is attached. The span is 72". It's as per design, just happened to noti...
by Jones
Fri May 16, 2008 8:41 am
Forum: Miscellaneous
Topic: Another Engineering Question
Replies: 4
Views: 1452

Another Engineering Question

Just an observation: When I loaded the BoJest onto the trailer and started working out the axle location (they're on a movable sub-frame) to adjust tongue weight, I noticed that the trailer exhibited some "spring". With a plumb hanging from the bow eye, I noticed I could get about 1/4" deflection wi...
by Jones
Thu May 15, 2008 12:41 pm
Forum: Power Boats
Topic: Bit size for Glen-L Bronze Screws?
Replies: 4
Views: 1791

Adding to the already good advice you've received, countersink tools that use a tapered drill are expensive but worth it. DeWalt happens to be the brand I use, and the countersink can be sharpened several times if you're careful. At the first sign of a spin, get out a sharp awl and remove the galled...
by Jones
Thu May 15, 2008 8:05 am
Forum: Miscellaneous
Topic: Bulding: Wood vs. Fiberglass vs. Steel - Whole 9 Yards
Replies: 0
Views: 1047

Bulding: Wood vs. Fiberglass vs. Steel - Whole 9 Yards

Okay, I'll try not to open the worlds biggest can of worms :!: We must have members who have built from more than one plan material, and I'm seeking comments about comparing the builds. Did you find them all to be equally difficult to master or was one easier? Any have "obnoxious" parts more than th...
by Jones
Thu May 15, 2008 7:55 am
Forum: Power Boats
Topic: If Only This Boat Was In Wood
Replies: 5
Views: 2088

gregggrundon wrote:Well I guess I mean... you just gotta learn to one-off...

Goood luck,

Gregg
I've been looking at just that, mostly with C'flex FG panels. At first glance, it looks as "involved" as making a boat from wood?
by Jones
Wed May 14, 2008 11:20 am
Forum: Miscellaneous
Topic: Long time coming
Replies: 11
Views: 2541

Oh yeah... at the end of the pictures on the move there's a guy holding his hand up in the air but the photo cuts off at his wrist.

Exactly what sign is he giving the neighborhood :?:


:lol:
by Jones
Wed May 14, 2008 11:18 am
Forum: Miscellaneous
Topic: Long time coming
Replies: 11
Views: 2541

Schweet job on all fronts. I'm proud of you for completing the degree, that had to be some pressure, especially with all the other family ordeals in the mix. The boat looks great and your theory on moving it seemed to quell the "haters" ;)

Job well done!
by Jones
Wed May 14, 2008 10:39 am
Forum: Miscellaneous
Topic: Is there an engineer in the house?
Replies: 23
Views: 4960

Bill Edmundson wrote:P= 4* 1300*17.64/84= 1092#

I left out the 4 previously. :oops: That's why we have checkers!

Bill
Got it! I had to enter it as 4*1300(17.64/84) on my TI for the language to be right, but I got the same sum. Thanks Bill, I've been needing to understand this for a while.

MJ
by Jones
Wed May 14, 2008 8:32 am
Forum: Miscellaneous
Topic: Is there an engineer in the house?
Replies: 23
Views: 4960

1st throw one more in. S is really I/c. I is bh^3/12 c= h/2 or S= bh^2/6 S= 3.5*(5.5)^2/6= 3.5(30.25)/6= 17.64 Playing with the equations P= fa*S/L Bill :idea: Ok... we're treating this as an inverted beam (yeah, you mentioned that, lol) as though it were hung from ends and a central load imposed, ...
by Jones
Wed May 14, 2008 6:54 am
Forum: Miscellaneous
Topic: Is there an engineer in the house?
Replies: 23
Views: 4960

We're looking at this as a simple beam only inverted. P = the load at the center in pounds L = length in inches 96" fa = allowable stress = 10000 pounds per sq. in. M = design bending moment in inch pounds S = section modulus cubic inches = 3.86 in^3 (you had 2 C4x5.4's 1.93 each) M = PL/4 =1608*96...
by Jones
Wed May 14, 2008 6:41 am
Forum: Miscellaneous
Topic: Is there an engineer in the house?
Replies: 23
Views: 4960

To continue on the strength of material calculations part of this, here's a picture of a doug fir spreader I built: http://i177.photobucket.com/albums/w223/Boatbuilder83501/3800%20trailer/woodspreader.jpg It's an 8' 4 x 6 (nominal) beam on a 7' actual spread and with your help I'd like to calculate ...