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  1. #106
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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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  3. #107
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    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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  5. #108
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    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!!!

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  7. #109
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    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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  9. #110
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    Quote Originally Posted by Gordon02 View Post
    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
    "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. #111
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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.

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  13. #112
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    NP, you finished yet! Enough yappin!

  14. #113
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    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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  16. #114
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    Thumbs up

    Quote Originally Posted by NICE PAIR View Post
    FUJIMO
    The Historic Photo Master


    Join DateJan 2004LocationFloridaPosts14,217Thanks (Given)0Thanks (Received)454Likes (Given)0Likes (Received)4177Mentioned2 Post(s)Tagged0 Thread(s)
    Originally Posted by NICE PAIR
    Tell me more about the high density foam.
    brand ?
    can I layer it to get the curve my transom has ?
    specs on density/weight ?
    any problems with epoxy resin ?
    ...120 lb density is nice for transom foam. you pick the brand. the core is not where the strength is mostly, it comes from the laminate on both sides of any stringer, tranverse stringer, bulkhead, transom, etc. I've purchased hundreds of thousands of dollars worth of CoreCell. same with DivinyCell. so I recommend them, but any PVC foam will do that you can get. it all bends & can be vacuum bagged in place. before use, drill a lot of random 1/8" holes in the foam for air/bedding compound escape. Epoxy is fine but vinylester works well too.
    Thanks for your input, NP









    Yo Fugimo! Thank-you for steering me towards the foam for the transom, I'll probably never use wood again.
    ...Glad you made the switch. Wish more people would do the same. There is no substitute.

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  18. #115
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    Baltic birch marine ply +

  19. #116
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    Quote Originally Posted by FMP View Post
    Baltic birch marine ply +
    African Okume Mahogany marine ply ++ Lighter weight!

  20. #117
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    Quote Originally Posted by FMP View Post
    NP, you finished yet! Enough yappin!
    Ha!

    Click image for larger version. 

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ID:	424364 glassed a couple more floor panels (gonna need them some day.)

    Click image for larger version. 

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ID:	424366 1st lamination of the keel to transom knee. (using left over vacuum bricks from the Skater build)

    Click image for larger version. 

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ID:	424367 layout dimensions for new splash well back wall.

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ID:	424368 1st layer 1700 bi-directional.

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ID:	424369 4 layers ... lunch time.

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ID:	424370 8 layers ... goin home early.

    Wriggleys gum makes me think of boating, "Double your engines, Double your fun"



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  22. #118
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    Quote Originally Posted by FMP View Post
    Baltic birch marine ply +
    Quote Originally Posted by home made tunnel View Post
    African Okume Mahogany marine ply ++ Lighter weight!
    DivinnyCell foam 80 psi +++ lighterer
    Wriggleys gum makes me think of boating, "Double your engines, Double your fun"



  23. #119
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    That curve might have been troublesome getting ply to conform. Only one that foam needs to impress is you.

  24. #120
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    Quote Originally Posted by NICE PAIR View Post
    DivinnyCell foam 80 psi +++ lighterer
    You win - 4x8 sheet of 1/2" is only 8 lbs compared to my okume 37 lbs. Birch is 49 lbs !

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