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TOPIC: short vs long shaft on 18 inch transom
short vs long shaft on 18 inch transom 9 years 2 months ago #112487
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If short shaft is 15" and long shaft is 20" which one goes on an 18" transom? Long shaft with a spacer?
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1960 slickcraft catalina
1963 g-w invader ski-bird 1972 g-w invader drag & ski 14 Portage Michigan |
Re:short vs long shaft on 18 inch transom 9 years 2 months ago #112503
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15" - Which is measured in a truly vertical sense and the transom you measured is at an angle, correct?
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Mark
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Re:short vs long shaft on 18 inch transom 9 years 2 months ago #112504
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Hmmm, How are you measuring your transom? What boat is this? Regardless, if it is truly 18" you'll need a Long Shaft motor and you may or may not need the aide of a spacer to get the motor where it needs to be.
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Re:short vs long shaft on 18 inch transom 9 years 2 months ago #112508
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I will measure it the correct way and re-post if needed!
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1960 slickcraft catalina
1963 g-w invader ski-bird 1972 g-w invader drag & ski 14 Portage Michigan |
Re:short vs long shaft on 18 inch transom 9 years 2 months ago #112515
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I questioned my own answer right after I posted it, I don't think the direct measurement is going to be 15" on an 18" angled transom. A 20" motor would be awfully long IMHO though, at least 2" longer than it needed to be which would create a great amount of drag in the water.
What boat are you talking about here Curse? |
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Mark
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Re:short vs long shaft on 18 inch transom 9 years 2 months ago #112520
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14 foot gw invader (1969-1972)
I will take some pics too |
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1960 slickcraft catalina
1963 g-w invader ski-bird 1972 g-w invader drag & ski 14 Portage Michigan |
Re:short vs long shaft on 18 inch transom 9 years 2 months ago #112531
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here's that measurement
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1960 slickcraft catalina
1963 g-w invader ski-bird 1972 g-w invader drag & ski 14 Portage Michigan |
Re:short vs long shaft on 18 inch transom 9 years 2 months ago #112537
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Hi,
It would appear that they intended for a short shaft to run elevated (jacked up). Regards, Joe |
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Profile Picture:
E. Carl Kiekhaefer (Mercury Founder) & Joe Poole Sr. @ 1964 Mercury Dealer Meeting |
Re:short vs long shaft on 18 inch transom 9 years 2 months ago #112613
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Just curious what the purpose of a jacked up short shaft would be. Would it be fo more performance?
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1960 slickcraft catalina
1963 g-w invader ski-bird 1972 g-w invader drag & ski 14 Portage Michigan |
Re:short vs long shaft on 18 inch transom 9 years 2 months ago #112615
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um...looks more to me like a 2in jack on a long shaft might work better.
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Re:short vs long shaft on 18 inch transom 9 years 2 months ago #112618
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I'd advise running a long shaft motor on that boat and putting a shim under the bracket.
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Re:short vs long shaft on 18 inch transom 9 years 2 months ago #112619
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Cool, I found a merc 65 long shaft in my garage I forgot about.
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1960 slickcraft catalina
1963 g-w invader ski-bird 1972 g-w invader drag & ski 14 Portage Michigan |
Re:short vs long shaft on 18 inch transom 9 years 2 months ago #112621
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yep...the joy of having so much stuff that we accidently find a treasure!!!
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Re:short vs long shaft on 18 inch transom 9 years 2 months ago #112632
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For future reference...
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Re:short vs long shaft on 18 inch transom 9 years 2 months ago #112662
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Previous owner says it had a short shaft. That picture shows 18 and 19 inch transoms could be either? I guess I will find out when the time comes. Thanks for that pic!
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1960 slickcraft catalina
1963 g-w invader ski-bird 1972 g-w invader drag & ski 14 Portage Michigan |
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