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[darrencuk]

Hi I'm looking at a motor for my boat I'm still learning a lot off stuff but motor shaft dieamter is 3.17mm and I can't find any couplings for this size or is there some thing I'm doing wrong please help before I rip what hair I have left out thanks

[Marks Model Bits]

I make them that size, it is a standard size for 540 motors marksmodelbits.com

Mark.

[hollowhornbear]

or here you want 3.2mm
http://www.cornwallmodelboats.co.uk/acatalog/raboesch-couplings.html

[unbuiltnautilus]

Also known as 1/8" in the good old days, in our case...yesterday!

[darrencuk]

Thanks guys how far should the motor be fitted in hull the plans don't show it sorry for all questions

[sailorboy61]

Thanks guys how far should the motor be fitted in hull the plans don't show it sorry for all questions

Obviously depends on the hull..... 'speedboats' usually have the motor well forward and at a decent angle down..... I personally dont have any but seen pics. If you can post a picture of yours, Im sure many illustrious members will soon be drowning you in specific info and details of what you want/need.