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11-27-2018, 11:56 PM #106Screaming And Flying!
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Termites won't go near it
OR carpenter ants
Last edited by FMP; 11-28-2018 at 04:08 PM.
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11-28-2018, 05:31 AM #107
I see you have been very busy doing some calculations and testing!...... You will be just fine even with a 400R...... Looking good...
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11-28-2018, 05:51 AM #108
OR just make the transom out of 2" thick steel. Then no questions!
Remember, even Wood has some squish when you tighten down the bolts. There's really not an issue if it has a little squish - It's not like it'll soak up water and ROT ! it's Foam afterall!!!1) 1995 14' Bayliner Restoration <--Click
2) Home-Made Tunnel-Boat Project <--Click
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11-28-2018, 08:14 AM #109
I knew thinking would get me in trouble......NP, seriously, this looks good. Your bench test results show that the "502 lbs of compression capacity" is way below the actual compression strength of your materials. That 502 number alone was the basis of my concern and math comments - not the use of foam of which I have absolutely no experience with. I was afraid we were all forgetting the clamp load that threaded fasteners impart on their clamped materials and those leveraged forces imparted by the propeller 20" away from the fulcrum where attachment is managed by two small 1/2" bolts through a transom. I'm enjoying the photos! The work is awesome and your cosmetics are some of the best I've ever seen. Keep them coming! Gordon
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11-28-2018, 09:28 AM #110
"No worries Mate" ;-) The 502 number, right or wrong was a guesstimate on how much a 1 3/4" washer spread the load. It was not attached to anything in general. the numbers you seem to be working with are maximum or fail numbers, I have no intentions of tightening the 4) 1/2 " bolts until the transom collapses or the bolts break. The force you are referring to is created by the prop, it is pushing on the transom bottom (load is spread by aluminum plates and lots of layers of glass) the opposing force is trying to pull the bolts apart @ the top, of the transom. (load is spread by washers, 1/4" glass splash well. 1/8" inside transom wall, 2+ inches 80 lb foam and multiple layers of cloth & resin, 1/8"+ outside transom wall) I'm thinking the tensile strength of the stainless bolts might not be high enough.
I have absolutely no fear of the transom failing, it is "Strong like Bull"
I don't understand why you want to use "ultimate" numbers, the bolts only need to be snug + plus 1 or 2 hundred pounds clamping force.
4) 1/2" x 4" aluminum bolts is what Johnrude supplied in 1966 to hold the 80hp motor on.
Again, thanks for your Kudos and concern, and making me re-think some of my values.
( it's probably a good thing I'm not a rocket scientist) ;-)
A famous guy once said: stand back and watch this, "hold my beer"Wriggleys gum makes me think of boating, "Double your engines, Double your fun"
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11-28-2018, 10:42 AM #111Screaming And Flying!
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A guy named steve 1 had some real world testing no's for balsa and foam with varying types of glass and thicknesses. His results were astounding to me. I wish it was still up on here and he was still around. There has been treasure troves of info lost over the years. And the physicals are for the foam only, not for laminated material. They have built 120' minesweepers out of divinnycel.
83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
Rebuild thread:
http://www.screamandfly.com/showthre...-it&highlight=
http://www.screamandfly.com/showthre...cs.&highlight=
Videos
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11-28-2018, 11:15 AM #112Screaming And Flying!
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NP, you finished yet! Enough yappin!
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11-28-2018, 12:21 PM #113
Just know this when you are questioning the limits of Foam cored laminates. I have flown aerobatic aircraft with foam cored, multilayer composite wings that put much higher forces across their span at load levels exceeding 6Gs.
I think your sub 200hp motor will be fine in your lifetime.
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11-28-2018, 12:23 PM #114The Historic Photo Master
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11-28-2018, 12:47 PM #115Screaming And Flying!
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Baltic birch marine ply +
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11-28-2018, 05:43 PM #1161) 1995 14' Bayliner Restoration <--Click
2) Home-Made Tunnel-Boat Project <--Click
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11-28-2018, 05:59 PM #117Wriggleys gum makes me think of boating, "Double your engines, Double your fun"
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11-28-2018, 06:01 PM #118
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11-28-2018, 06:34 PM #119Screaming And Flying!
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That curve might have been troublesome getting ply to conform. Only one that foam needs to impress is you.
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11-28-2018, 06:39 PM #1201) 1995 14' Bayliner Restoration <--Click
2) Home-Made Tunnel-Boat Project <--Click
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